[FFmpeg-cvslog] r14790 - in trunk/libavcodec: Makefile flacenc.c lpc.c lpc.h
ramiro
subversion
Sat Aug 16 19:18:21 CEST 2008
Author: ramiro
Date: Sat Aug 16 19:18:20 2008
New Revision: 14790
Log:
flacenc, lpc: Move LPC code from flacenc.c to new lpc.[ch] files.
Added:
trunk/libavcodec/lpc.c
- copied, changed from r14789, /trunk/libavcodec/flacenc.c
trunk/libavcodec/lpc.h
- copied, changed from r14789, /trunk/libavcodec/flacenc.c
Modified:
trunk/libavcodec/Makefile
trunk/libavcodec/flacenc.c
Modified: trunk/libavcodec/Makefile
==============================================================================
--- trunk/libavcodec/Makefile (original)
+++ trunk/libavcodec/Makefile Sat Aug 16 19:18:20 2008
@@ -72,7 +72,7 @@ OBJS-$(CONFIG_FFV1_ENCODER) +
OBJS-$(CONFIG_FFVHUFF_DECODER) += huffyuv.o
OBJS-$(CONFIG_FFVHUFF_ENCODER) += huffyuv.o
OBJS-$(CONFIG_FLAC_DECODER) += flac.o golomb.o
-OBJS-$(CONFIG_FLAC_ENCODER) += flacenc.o golomb.o
+OBJS-$(CONFIG_FLAC_ENCODER) += flacenc.o golomb.o lpc.o
OBJS-$(CONFIG_FLASHSV_DECODER) += flashsv.o
OBJS-$(CONFIG_FLASHSV_ENCODER) += flashsvenc.o
OBJS-$(CONFIG_FLIC_DECODER) += flicvideo.o
Modified: trunk/libavcodec/flacenc.c
==============================================================================
--- trunk/libavcodec/flacenc.c (original)
+++ trunk/libavcodec/flacenc.c Sat Aug 16 19:18:20 2008
@@ -25,6 +25,7 @@
#include "bitstream.h"
#include "dsputil.h"
#include "golomb.h"
+#include "lpc.h"
#define FLAC_MAX_CH 8
#define FLAC_MIN_BLOCKSIZE 16
@@ -41,17 +42,8 @@
#define FLAC_CHMODE_RIGHT_SIDE 9
#define FLAC_CHMODE_MID_SIDE 10
-#define ORDER_METHOD_EST 0
-#define ORDER_METHOD_2LEVEL 1
-#define ORDER_METHOD_4LEVEL 2
-#define ORDER_METHOD_8LEVEL 3
-#define ORDER_METHOD_SEARCH 4
-#define ORDER_METHOD_LOG 5
-
#define FLAC_STREAMINFO_SIZE 34
-#define MIN_LPC_ORDER 1
-#define MAX_LPC_ORDER 32
#define MAX_FIXED_ORDER 4
#define MAX_PARTITION_ORDER 8
#define MAX_PARTITIONS (1 << MAX_PARTITION_ORDER)
@@ -635,185 +627,6 @@ void ff_flac_compute_autocorr(const int3
}
}
-/**
- * Levinson-Durbin recursion.
- * Produces LPC coefficients from autocorrelation data.
- */
-static void compute_lpc_coefs(const double *autoc, int max_order,
- double lpc[][MAX_LPC_ORDER], double *ref)
-{
- int i, j, i2;
- double r, err, tmp;
- double lpc_tmp[MAX_LPC_ORDER];
-
- for(i=0; i<max_order; i++) lpc_tmp[i] = 0;
- err = autoc[0];
-
- for(i=0; i<max_order; i++) {
- r = -autoc[i+1];
- for(j=0; j<i; j++) {
- r -= lpc_tmp[j] * autoc[i-j];
- }
- r /= err;
- ref[i] = fabs(r);
-
- err *= 1.0 - (r * r);
-
- i2 = (i >> 1);
- lpc_tmp[i] = r;
- for(j=0; j<i2; j++) {
- tmp = lpc_tmp[j];
- lpc_tmp[j] += r * lpc_tmp[i-1-j];
- lpc_tmp[i-1-j] += r * tmp;
- }
- if(i & 1) {
- lpc_tmp[j] += lpc_tmp[j] * r;
- }
-
- for(j=0; j<=i; j++) {
- lpc[i][j] = -lpc_tmp[j];
- }
- }
-}
-
-/**
- * Quantize LPC coefficients
- */
-static void quantize_lpc_coefs(double *lpc_in, int order, int precision,
- int32_t *lpc_out, int *shift, int max_shift, int zero_shift)
-{
- int i;
- double cmax, error;
- int32_t qmax;
- int sh;
-
- /* define maximum levels */
- qmax = (1 << (precision - 1)) - 1;
-
- /* find maximum coefficient value */
- cmax = 0.0;
- for(i=0; i<order; i++) {
- cmax= FFMAX(cmax, fabs(lpc_in[i]));
- }
-
- /* if maximum value quantizes to zero, return all zeros */
- if(cmax * (1 << max_shift) < 1.0) {
- *shift = zero_shift;
- memset(lpc_out, 0, sizeof(int32_t) * order);
- return;
- }
-
- /* calculate level shift which scales max coeff to available bits */
- sh = max_shift;
- while((cmax * (1 << sh) > qmax) && (sh > 0)) {
- sh--;
- }
-
- /* since negative shift values are unsupported in decoder, scale down
- coefficients instead */
- if(sh == 0 && cmax > qmax) {
- double scale = ((double)qmax) / cmax;
- for(i=0; i<order; i++) {
- lpc_in[i] *= scale;
- }
- }
-
- /* output quantized coefficients and level shift */
- error=0;
- for(i=0; i<order; i++) {
- error += lpc_in[i] * (1 << sh);
- lpc_out[i] = av_clip(lrintf(error), -qmax, qmax);
- error -= lpc_out[i];
- }
- *shift = sh;
-}
-
-static int estimate_best_order(double *ref, int max_order)
-{
- int i, est;
-
- est = 1;
- for(i=max_order-1; i>=0; i--) {
- if(ref[i] > 0.10) {
- est = i+1;
- break;
- }
- }
- return est;
-}
-
-/**
- * Calculate LPC coefficients for multiple orders
- */
-static int lpc_calc_coefs(DSPContext *s,
- const int32_t *samples, int blocksize, int max_order,
- int precision, int32_t coefs[][MAX_LPC_ORDER],
- int *shift, int use_lpc, int omethod, int max_shift, int zero_shift)
-{
- double autoc[MAX_LPC_ORDER+1];
- double ref[MAX_LPC_ORDER];
- double lpc[MAX_LPC_ORDER][MAX_LPC_ORDER];
- int i, j, pass;
- int opt_order;
-
- assert(max_order >= MIN_LPC_ORDER && max_order <= MAX_LPC_ORDER);
-
- if(use_lpc == 1){
- s->flac_compute_autocorr(samples, blocksize, max_order, autoc);
-
- compute_lpc_coefs(autoc, max_order, lpc, ref);
- }else{
- LLSModel m[2];
- double var[MAX_LPC_ORDER+1], weight;
-
- for(pass=0; pass<use_lpc-1; pass++){
- av_init_lls(&m[pass&1], max_order);
-
- weight=0;
- for(i=max_order; i<blocksize; i++){
- for(j=0; j<=max_order; j++)
- var[j]= samples[i-j];
-
- if(pass){
- double eval, inv, rinv;
- eval= av_evaluate_lls(&m[(pass-1)&1], var+1, max_order-1);
- eval= (512>>pass) + fabs(eval - var[0]);
- inv = 1/eval;
- rinv = sqrt(inv);
- for(j=0; j<=max_order; j++)
- var[j] *= rinv;
- weight += inv;
- }else
- weight++;
-
- av_update_lls(&m[pass&1], var, 1.0);
- }
- av_solve_lls(&m[pass&1], 0.001, 0);
- }
-
- for(i=0; i<max_order; i++){
- for(j=0; j<max_order; j++)
- lpc[i][j]= m[(pass-1)&1].coeff[i][j];
- ref[i]= sqrt(m[(pass-1)&1].variance[i] / weight) * (blocksize - max_order) / 4000;
- }
- for(i=max_order-1; i>0; i--)
- ref[i] = ref[i-1] - ref[i];
- }
- opt_order = max_order;
-
- if(omethod == ORDER_METHOD_EST) {
- opt_order = estimate_best_order(ref, max_order);
- i = opt_order-1;
- quantize_lpc_coefs(lpc[i], i+1, precision, coefs[i], &shift[i], max_shift, zero_shift);
- } else {
- for(i=0; i<max_order; i++) {
- quantize_lpc_coefs(lpc[i], i+1, precision, coefs[i], &shift[i], max_shift, zero_shift);
- }
- }
-
- return opt_order;
-}
-
static void encode_residual_verbatim(int32_t *res, int32_t *smp, int n)
{
@@ -1042,7 +855,7 @@ static int encode_residual(FlacEncodeCon
}
/* LPC */
- opt_order = lpc_calc_coefs(&ctx->dsp, smp, n, max_order, precision, coefs,
+ opt_order = ff_lpc_calc_coefs(&ctx->dsp, smp, n, max_order, precision, coefs,
shift, ctx->options.use_lpc, omethod, MAX_LPC_SHIFT, 0);
if(omethod == ORDER_METHOD_2LEVEL ||
Copied: trunk/libavcodec/lpc.c (from r14789, /trunk/libavcodec/flacenc.c)
==============================================================================
--- /trunk/libavcodec/flacenc.c (original)
+++ trunk/libavcodec/lpc.c Sat Aug 16 19:18:20 2008
@@ -1,5 +1,5 @@
/**
- * FLAC audio encoder
+ * LPC utility code
* Copyright (c) 2006 Justin Ruggles <jruggle at earthlink.net>
*
* This file is part of FFmpeg.
@@ -19,621 +19,10 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include "libavutil/crc.h"
#include "libavutil/lls.h"
-#include "avcodec.h"
-#include "bitstream.h"
#include "dsputil.h"
-#include "golomb.h"
-
-#define FLAC_MAX_CH 8
-#define FLAC_MIN_BLOCKSIZE 16
-#define FLAC_MAX_BLOCKSIZE 65535
-
-#define FLAC_SUBFRAME_CONSTANT 0
-#define FLAC_SUBFRAME_VERBATIM 1
-#define FLAC_SUBFRAME_FIXED 8
-#define FLAC_SUBFRAME_LPC 32
-
-#define FLAC_CHMODE_NOT_STEREO 0
-#define FLAC_CHMODE_LEFT_RIGHT 1
-#define FLAC_CHMODE_LEFT_SIDE 8
-#define FLAC_CHMODE_RIGHT_SIDE 9
-#define FLAC_CHMODE_MID_SIDE 10
-
-#define ORDER_METHOD_EST 0
-#define ORDER_METHOD_2LEVEL 1
-#define ORDER_METHOD_4LEVEL 2
-#define ORDER_METHOD_8LEVEL 3
-#define ORDER_METHOD_SEARCH 4
-#define ORDER_METHOD_LOG 5
-
-#define FLAC_STREAMINFO_SIZE 34
-
-#define MIN_LPC_ORDER 1
-#define MAX_LPC_ORDER 32
-#define MAX_FIXED_ORDER 4
-#define MAX_PARTITION_ORDER 8
-#define MAX_PARTITIONS (1 << MAX_PARTITION_ORDER)
-#define MAX_LPC_PRECISION 15
-#define MAX_LPC_SHIFT 15
-#define MAX_RICE_PARAM 14
-
-typedef struct CompressionOptions {
- int compression_level;
- int block_time_ms;
- int use_lpc;
- int lpc_coeff_precision;
- int min_prediction_order;
- int max_prediction_order;
- int prediction_order_method;
- int min_partition_order;
- int max_partition_order;
-} CompressionOptions;
-
-typedef struct RiceContext {
- int porder;
- int params[MAX_PARTITIONS];
-} RiceContext;
-
-typedef struct FlacSubframe {
- int type;
- int type_code;
- int obits;
- int order;
- int32_t coefs[MAX_LPC_ORDER];
- int shift;
- RiceContext rc;
- int32_t samples[FLAC_MAX_BLOCKSIZE];
- int32_t residual[FLAC_MAX_BLOCKSIZE+1];
-} FlacSubframe;
-
-typedef struct FlacFrame {
- FlacSubframe subframes[FLAC_MAX_CH];
- int blocksize;
- int bs_code[2];
- uint8_t crc8;
- int ch_mode;
-} FlacFrame;
-
-typedef struct FlacEncodeContext {
- PutBitContext pb;
- int channels;
- int ch_code;
- int samplerate;
- int sr_code[2];
- int max_framesize;
- uint32_t frame_count;
- FlacFrame frame;
- CompressionOptions options;
- AVCodecContext *avctx;
- DSPContext dsp;
-} FlacEncodeContext;
-
-static const int flac_samplerates[16] = {
- 0, 0, 0, 0,
- 8000, 16000, 22050, 24000, 32000, 44100, 48000, 96000,
- 0, 0, 0, 0
-};
-
-static const int flac_blocksizes[16] = {
- 0,
- 192,
- 576, 1152, 2304, 4608,
- 0, 0,
- 256, 512, 1024, 2048, 4096, 8192, 16384, 32768
-};
-
-/**
- * Writes streaminfo metadata block to byte array
- */
-static void write_streaminfo(FlacEncodeContext *s, uint8_t *header)
-{
- PutBitContext pb;
-
- memset(header, 0, FLAC_STREAMINFO_SIZE);
- init_put_bits(&pb, header, FLAC_STREAMINFO_SIZE);
-
- /* streaminfo metadata block */
- put_bits(&pb, 16, s->avctx->frame_size);
- put_bits(&pb, 16, s->avctx->frame_size);
- put_bits(&pb, 24, 0);
- put_bits(&pb, 24, s->max_framesize);
- put_bits(&pb, 20, s->samplerate);
- put_bits(&pb, 3, s->channels-1);
- put_bits(&pb, 5, 15); /* bits per sample - 1 */
- flush_put_bits(&pb);
- /* total samples = 0 */
- /* MD5 signature = 0 */
-}
-
-/**
- * Sets blocksize based on samplerate
- * Chooses the closest predefined blocksize >= BLOCK_TIME_MS milliseconds
- */
-static int select_blocksize(int samplerate, int block_time_ms)
-{
- int i;
- int target;
- int blocksize;
-
- assert(samplerate > 0);
- blocksize = flac_blocksizes[1];
- target = (samplerate * block_time_ms) / 1000;
- for(i=0; i<16; i++) {
- if(target >= flac_blocksizes[i] && flac_blocksizes[i] > blocksize) {
- blocksize = flac_blocksizes[i];
- }
- }
- return blocksize;
-}
-
-static av_cold int flac_encode_init(AVCodecContext *avctx)
-{
- int freq = avctx->sample_rate;
- int channels = avctx->channels;
- FlacEncodeContext *s = avctx->priv_data;
- int i, level;
- uint8_t *streaminfo;
-
- s->avctx = avctx;
-
- dsputil_init(&s->dsp, avctx);
-
- if(avctx->sample_fmt != SAMPLE_FMT_S16) {
- return -1;
- }
-
- if(channels < 1 || channels > FLAC_MAX_CH) {
- return -1;
- }
- s->channels = channels;
- s->ch_code = s->channels-1;
-
- /* find samplerate in table */
- if(freq < 1)
- return -1;
- for(i=4; i<12; i++) {
- if(freq == flac_samplerates[i]) {
- s->samplerate = flac_samplerates[i];
- s->sr_code[0] = i;
- s->sr_code[1] = 0;
- break;
- }
- }
- /* if not in table, samplerate is non-standard */
- if(i == 12) {
- if(freq % 1000 == 0 && freq < 255000) {
- s->sr_code[0] = 12;
- s->sr_code[1] = freq / 1000;
- } else if(freq % 10 == 0 && freq < 655350) {
- s->sr_code[0] = 14;
- s->sr_code[1] = freq / 10;
- } else if(freq < 65535) {
- s->sr_code[0] = 13;
- s->sr_code[1] = freq;
- } else {
- return -1;
- }
- s->samplerate = freq;
- }
-
- /* set compression option defaults based on avctx->compression_level */
- if(avctx->compression_level < 0) {
- s->options.compression_level = 5;
- } else {
- s->options.compression_level = avctx->compression_level;
- }
- av_log(avctx, AV_LOG_DEBUG, " compression: %d\n", s->options.compression_level);
-
- level= s->options.compression_level;
- if(level > 12) {
- av_log(avctx, AV_LOG_ERROR, "invalid compression level: %d\n",
- s->options.compression_level);
- return -1;
- }
-
- s->options.block_time_ms = ((int[]){ 27, 27, 27,105,105,105,105,105,105,105,105,105,105})[level];
- s->options.use_lpc = ((int[]){ 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1})[level];
- s->options.min_prediction_order= ((int[]){ 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1})[level];
- s->options.max_prediction_order= ((int[]){ 3, 4, 4, 6, 8, 8, 8, 8, 12, 12, 12, 32, 32})[level];
- s->options.prediction_order_method = ((int[]){ ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST,
- ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST,
- ORDER_METHOD_4LEVEL, ORDER_METHOD_LOG, ORDER_METHOD_4LEVEL,
- ORDER_METHOD_LOG, ORDER_METHOD_SEARCH, ORDER_METHOD_LOG,
- ORDER_METHOD_SEARCH})[level];
- s->options.min_partition_order = ((int[]){ 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})[level];
- s->options.max_partition_order = ((int[]){ 2, 2, 3, 3, 3, 8, 8, 8, 8, 8, 8, 8, 8})[level];
-
- /* set compression option overrides from AVCodecContext */
- if(avctx->use_lpc >= 0) {
- s->options.use_lpc = av_clip(avctx->use_lpc, 0, 11);
- }
- if(s->options.use_lpc == 1)
- av_log(avctx, AV_LOG_DEBUG, " use lpc: Levinson-Durbin recursion with Welch window\n");
- else if(s->options.use_lpc > 1)
- av_log(avctx, AV_LOG_DEBUG, " use lpc: Cholesky factorization\n");
-
- if(avctx->min_prediction_order >= 0) {
- if(s->options.use_lpc) {
- if(avctx->min_prediction_order < MIN_LPC_ORDER ||
- avctx->min_prediction_order > MAX_LPC_ORDER) {
- av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n",
- avctx->min_prediction_order);
- return -1;
- }
- } else {
- if(avctx->min_prediction_order > MAX_FIXED_ORDER) {
- av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n",
- avctx->min_prediction_order);
- return -1;
- }
- }
- s->options.min_prediction_order = avctx->min_prediction_order;
- }
- if(avctx->max_prediction_order >= 0) {
- if(s->options.use_lpc) {
- if(avctx->max_prediction_order < MIN_LPC_ORDER ||
- avctx->max_prediction_order > MAX_LPC_ORDER) {
- av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n",
- avctx->max_prediction_order);
- return -1;
- }
- } else {
- if(avctx->max_prediction_order > MAX_FIXED_ORDER) {
- av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n",
- avctx->max_prediction_order);
- return -1;
- }
- }
- s->options.max_prediction_order = avctx->max_prediction_order;
- }
- if(s->options.max_prediction_order < s->options.min_prediction_order) {
- av_log(avctx, AV_LOG_ERROR, "invalid prediction orders: min=%d max=%d\n",
- s->options.min_prediction_order, s->options.max_prediction_order);
- return -1;
- }
- av_log(avctx, AV_LOG_DEBUG, " prediction order: %d, %d\n",
- s->options.min_prediction_order, s->options.max_prediction_order);
-
- if(avctx->prediction_order_method >= 0) {
- if(avctx->prediction_order_method > ORDER_METHOD_LOG) {
- av_log(avctx, AV_LOG_ERROR, "invalid prediction order method: %d\n",
- avctx->prediction_order_method);
- return -1;
- }
- s->options.prediction_order_method = avctx->prediction_order_method;
- }
- switch(s->options.prediction_order_method) {
- case ORDER_METHOD_EST: av_log(avctx, AV_LOG_DEBUG, " order method: %s\n",
- "estimate"); break;
- case ORDER_METHOD_2LEVEL: av_log(avctx, AV_LOG_DEBUG, " order method: %s\n",
- "2-level"); break;
- case ORDER_METHOD_4LEVEL: av_log(avctx, AV_LOG_DEBUG, " order method: %s\n",
- "4-level"); break;
- case ORDER_METHOD_8LEVEL: av_log(avctx, AV_LOG_DEBUG, " order method: %s\n",
- "8-level"); break;
- case ORDER_METHOD_SEARCH: av_log(avctx, AV_LOG_DEBUG, " order method: %s\n",
- "full search"); break;
- case ORDER_METHOD_LOG: av_log(avctx, AV_LOG_DEBUG, " order method: %s\n",
- "log search"); break;
- }
-
- if(avctx->min_partition_order >= 0) {
- if(avctx->min_partition_order > MAX_PARTITION_ORDER) {
- av_log(avctx, AV_LOG_ERROR, "invalid min partition order: %d\n",
- avctx->min_partition_order);
- return -1;
- }
- s->options.min_partition_order = avctx->min_partition_order;
- }
- if(avctx->max_partition_order >= 0) {
- if(avctx->max_partition_order > MAX_PARTITION_ORDER) {
- av_log(avctx, AV_LOG_ERROR, "invalid max partition order: %d\n",
- avctx->max_partition_order);
- return -1;
- }
- s->options.max_partition_order = avctx->max_partition_order;
- }
- if(s->options.max_partition_order < s->options.min_partition_order) {
- av_log(avctx, AV_LOG_ERROR, "invalid partition orders: min=%d max=%d\n",
- s->options.min_partition_order, s->options.max_partition_order);
- return -1;
- }
- av_log(avctx, AV_LOG_DEBUG, " partition order: %d, %d\n",
- s->options.min_partition_order, s->options.max_partition_order);
-
- if(avctx->frame_size > 0) {
- if(avctx->frame_size < FLAC_MIN_BLOCKSIZE ||
- avctx->frame_size > FLAC_MAX_BLOCKSIZE) {
- av_log(avctx, AV_LOG_ERROR, "invalid block size: %d\n",
- avctx->frame_size);
- return -1;
- }
- } else {
- s->avctx->frame_size = select_blocksize(s->samplerate, s->options.block_time_ms);
- }
- av_log(avctx, AV_LOG_DEBUG, " block size: %d\n", s->avctx->frame_size);
-
- /* set LPC precision */
- if(avctx->lpc_coeff_precision > 0) {
- if(avctx->lpc_coeff_precision > MAX_LPC_PRECISION) {
- av_log(avctx, AV_LOG_ERROR, "invalid lpc coeff precision: %d\n",
- avctx->lpc_coeff_precision);
- return -1;
- }
- s->options.lpc_coeff_precision = avctx->lpc_coeff_precision;
- } else {
- /* default LPC precision */
- s->options.lpc_coeff_precision = 15;
- }
- av_log(avctx, AV_LOG_DEBUG, " lpc precision: %d\n",
- s->options.lpc_coeff_precision);
-
- /* set maximum encoded frame size in verbatim mode */
- if(s->channels == 2) {
- s->max_framesize = 14 + ((s->avctx->frame_size * 33 + 7) >> 3);
- } else {
- s->max_framesize = 14 + (s->avctx->frame_size * s->channels * 2);
- }
-
- streaminfo = av_malloc(FLAC_STREAMINFO_SIZE);
- write_streaminfo(s, streaminfo);
- avctx->extradata = streaminfo;
- avctx->extradata_size = FLAC_STREAMINFO_SIZE;
-
- s->frame_count = 0;
-
- avctx->coded_frame = avcodec_alloc_frame();
- avctx->coded_frame->key_frame = 1;
-
- return 0;
-}
-
-static void init_frame(FlacEncodeContext *s)
-{
- int i, ch;
- FlacFrame *frame;
-
- frame = &s->frame;
-
- for(i=0; i<16; i++) {
- if(s->avctx->frame_size == flac_blocksizes[i]) {
- frame->blocksize = flac_blocksizes[i];
- frame->bs_code[0] = i;
- frame->bs_code[1] = 0;
- break;
- }
- }
- if(i == 16) {
- frame->blocksize = s->avctx->frame_size;
- if(frame->blocksize <= 256) {
- frame->bs_code[0] = 6;
- frame->bs_code[1] = frame->blocksize-1;
- } else {
- frame->bs_code[0] = 7;
- frame->bs_code[1] = frame->blocksize-1;
- }
- }
-
- for(ch=0; ch<s->channels; ch++) {
- frame->subframes[ch].obits = 16;
- }
-}
-
-/**
- * Copy channel-interleaved input samples into separate subframes
- */
-static void copy_samples(FlacEncodeContext *s, int16_t *samples)
-{
- int i, j, ch;
- FlacFrame *frame;
-
- frame = &s->frame;
- for(i=0,j=0; i<frame->blocksize; i++) {
- for(ch=0; ch<s->channels; ch++,j++) {
- frame->subframes[ch].samples[i] = samples[j];
- }
- }
-}
-
-
-#define rice_encode_count(sum, n, k) (((n)*((k)+1))+((sum-(n>>1))>>(k)))
-
-/**
- * Solve for d/dk(rice_encode_count) = n-((sum-(n>>1))>>(k+1)) = 0
- */
-static int find_optimal_param(uint32_t sum, int n)
-{
- int k;
- uint32_t sum2;
-
- if(sum <= n>>1)
- return 0;
- sum2 = sum-(n>>1);
- k = av_log2(n<256 ? FASTDIV(sum2,n) : sum2/n);
- return FFMIN(k, MAX_RICE_PARAM);
-}
-
-static uint32_t calc_optimal_rice_params(RiceContext *rc, int porder,
- uint32_t *sums, int n, int pred_order)
-{
- int i;
- int k, cnt, part;
- uint32_t all_bits;
-
- part = (1 << porder);
- all_bits = 4 * part;
-
- cnt = (n >> porder) - pred_order;
- for(i=0; i<part; i++) {
- k = find_optimal_param(sums[i], cnt);
- rc->params[i] = k;
- all_bits += rice_encode_count(sums[i], cnt, k);
- cnt = n >> porder;
- }
-
- rc->porder = porder;
-
- return all_bits;
-}
-
-static void calc_sums(int pmin, int pmax, uint32_t *data, int n, int pred_order,
- uint32_t sums[][MAX_PARTITIONS])
-{
- int i, j;
- int parts;
- uint32_t *res, *res_end;
-
- /* sums for highest level */
- parts = (1 << pmax);
- res = &data[pred_order];
- res_end = &data[n >> pmax];
- for(i=0; i<parts; i++) {
- uint32_t sum = 0;
- while(res < res_end){
- sum += *(res++);
- }
- sums[pmax][i] = sum;
- res_end+= n >> pmax;
- }
- /* sums for lower levels */
- for(i=pmax-1; i>=pmin; i--) {
- parts = (1 << i);
- for(j=0; j<parts; j++) {
- sums[i][j] = sums[i+1][2*j] + sums[i+1][2*j+1];
- }
- }
-}
-
-static uint32_t calc_rice_params(RiceContext *rc, int pmin, int pmax,
- int32_t *data, int n, int pred_order)
-{
- int i;
- uint32_t bits[MAX_PARTITION_ORDER+1];
- int opt_porder;
- RiceContext tmp_rc;
- uint32_t *udata;
- uint32_t sums[MAX_PARTITION_ORDER+1][MAX_PARTITIONS];
-
- assert(pmin >= 0 && pmin <= MAX_PARTITION_ORDER);
- assert(pmax >= 0 && pmax <= MAX_PARTITION_ORDER);
- assert(pmin <= pmax);
-
- udata = av_malloc(n * sizeof(uint32_t));
- for(i=0; i<n; i++) {
- udata[i] = (2*data[i]) ^ (data[i]>>31);
- }
-
- calc_sums(pmin, pmax, udata, n, pred_order, sums);
-
- opt_porder = pmin;
- bits[pmin] = UINT32_MAX;
- for(i=pmin; i<=pmax; i++) {
- bits[i] = calc_optimal_rice_params(&tmp_rc, i, sums[i], n, pred_order);
- if(bits[i] <= bits[opt_porder]) {
- opt_porder = i;
- *rc= tmp_rc;
- }
- }
-
- av_freep(&udata);
- return bits[opt_porder];
-}
-
-static int get_max_p_order(int max_porder, int n, int order)
-{
- int porder = FFMIN(max_porder, av_log2(n^(n-1)));
- if(order > 0)
- porder = FFMIN(porder, av_log2(n/order));
- return porder;
-}
-
-static uint32_t calc_rice_params_fixed(RiceContext *rc, int pmin, int pmax,
- int32_t *data, int n, int pred_order,
- int bps)
-{
- uint32_t bits;
- pmin = get_max_p_order(pmin, n, pred_order);
- pmax = get_max_p_order(pmax, n, pred_order);
- bits = pred_order*bps + 6;
- bits += calc_rice_params(rc, pmin, pmax, data, n, pred_order);
- return bits;
-}
-
-static uint32_t calc_rice_params_lpc(RiceContext *rc, int pmin, int pmax,
- int32_t *data, int n, int pred_order,
- int bps, int precision)
-{
- uint32_t bits;
- pmin = get_max_p_order(pmin, n, pred_order);
- pmax = get_max_p_order(pmax, n, pred_order);
- bits = pred_order*bps + 4 + 5 + pred_order*precision + 6;
- bits += calc_rice_params(rc, pmin, pmax, data, n, pred_order);
- return bits;
-}
-
-/**
- * Apply Welch window function to audio block
- */
-static void apply_welch_window(const int32_t *data, int len, double *w_data)
-{
- int i, n2;
- double w;
- double c;
-
- assert(!(len&1)); //the optimization in r11881 does not support odd len
- //if someone wants odd len extend the change in r11881
-
- n2 = (len >> 1);
- c = 2.0 / (len - 1.0);
-
- w_data+=n2;
- data+=n2;
- for(i=0; i<n2; i++) {
- w = c - n2 + i;
- w = 1.0 - (w * w);
- w_data[-i-1] = data[-i-1] * w;
- w_data[+i ] = data[+i ] * w;
- }
-}
-
-/**
- * Calculates autocorrelation data from audio samples
- * A Welch window function is applied before calculation.
- */
-void ff_flac_compute_autocorr(const int32_t *data, int len, int lag,
- double *autoc)
-{
- int i, j;
- double tmp[len + lag + 1];
- double *data1= tmp + lag;
-
- apply_welch_window(data, len, data1);
-
- for(j=0; j<lag; j++)
- data1[j-lag]= 0.0;
- data1[len] = 0.0;
-
- for(j=0; j<lag; j+=2){
- double sum0 = 1.0, sum1 = 1.0;
- for(i=0; i<len; i++){
- sum0 += data1[i] * data1[i-j];
- sum1 += data1[i] * data1[i-j-1];
- }
- autoc[j ] = sum0;
- autoc[j+1] = sum1;
- }
+#include "lpc.h"
- if(j==lag){
- double sum = 1.0;
- for(i=0; i<len; i+=2){
- sum += data1[i ] * data1[i-j ]
- + data1[i+1] * data1[i-j+1];
- }
- autoc[j] = sum;
- }
-}
/**
* Levinson-Durbin recursion.
@@ -745,7 +134,7 @@ static int estimate_best_order(double *r
/**
* Calculate LPC coefficients for multiple orders
*/
-static int lpc_calc_coefs(DSPContext *s,
+int ff_lpc_calc_coefs(DSPContext *s,
const int32_t *samples, int blocksize, int max_order,
int precision, int32_t coefs[][MAX_LPC_ORDER],
int *shift, int use_lpc, int omethod, int max_shift, int zero_shift)
@@ -813,679 +202,3 @@ static int lpc_calc_coefs(DSPContext *s,
return opt_order;
}
-
-
-static void encode_residual_verbatim(int32_t *res, int32_t *smp, int n)
-{
- assert(n > 0);
- memcpy(res, smp, n * sizeof(int32_t));
-}
-
-static void encode_residual_fixed(int32_t *res, const int32_t *smp, int n,
- int order)
-{
- int i;
-
- for(i=0; i<order; i++) {
- res[i] = smp[i];
- }
-
- if(order==0){
- for(i=order; i<n; i++)
- res[i]= smp[i];
- }else if(order==1){
- for(i=order; i<n; i++)
- res[i]= smp[i] - smp[i-1];
- }else if(order==2){
- int a = smp[order-1] - smp[order-2];
- for(i=order; i<n; i+=2) {
- int b = smp[i] - smp[i-1];
- res[i]= b - a;
- a = smp[i+1] - smp[i];
- res[i+1]= a - b;
- }
- }else if(order==3){
- int a = smp[order-1] - smp[order-2];
- int c = smp[order-1] - 2*smp[order-2] + smp[order-3];
- for(i=order; i<n; i+=2) {
- int b = smp[i] - smp[i-1];
- int d = b - a;
- res[i]= d - c;
- a = smp[i+1] - smp[i];
- c = a - b;
- res[i+1]= c - d;
- }
- }else{
- int a = smp[order-1] - smp[order-2];
- int c = smp[order-1] - 2*smp[order-2] + smp[order-3];
- int e = smp[order-1] - 3*smp[order-2] + 3*smp[order-3] - smp[order-4];
- for(i=order; i<n; i+=2) {
- int b = smp[i] - smp[i-1];
- int d = b - a;
- int f = d - c;
- res[i]= f - e;
- a = smp[i+1] - smp[i];
- c = a - b;
- e = c - d;
- res[i+1]= e - f;
- }
- }
-}
-
-#define LPC1(x) {\
- int c = coefs[(x)-1];\
- p0 += c*s;\
- s = smp[i-(x)+1];\
- p1 += c*s;\
-}
-
-static av_always_inline void encode_residual_lpc_unrolled(
- int32_t *res, const int32_t *smp, int n,
- int order, const int32_t *coefs, int shift, int big)
-{
- int i;
- for(i=order; i<n; i+=2) {
- int s = smp[i-order];
- int p0 = 0, p1 = 0;
- if(big) {
- switch(order) {
- case 32: LPC1(32)
- case 31: LPC1(31)
- case 30: LPC1(30)
- case 29: LPC1(29)
- case 28: LPC1(28)
- case 27: LPC1(27)
- case 26: LPC1(26)
- case 25: LPC1(25)
- case 24: LPC1(24)
- case 23: LPC1(23)
- case 22: LPC1(22)
- case 21: LPC1(21)
- case 20: LPC1(20)
- case 19: LPC1(19)
- case 18: LPC1(18)
- case 17: LPC1(17)
- case 16: LPC1(16)
- case 15: LPC1(15)
- case 14: LPC1(14)
- case 13: LPC1(13)
- case 12: LPC1(12)
- case 11: LPC1(11)
- case 10: LPC1(10)
- case 9: LPC1( 9)
- LPC1( 8)
- LPC1( 7)
- LPC1( 6)
- LPC1( 5)
- LPC1( 4)
- LPC1( 3)
- LPC1( 2)
- LPC1( 1)
- }
- } else {
- switch(order) {
- case 8: LPC1( 8)
- case 7: LPC1( 7)
- case 6: LPC1( 6)
- case 5: LPC1( 5)
- case 4: LPC1( 4)
- case 3: LPC1( 3)
- case 2: LPC1( 2)
- case 1: LPC1( 1)
- }
- }
- res[i ] = smp[i ] - (p0 >> shift);
- res[i+1] = smp[i+1] - (p1 >> shift);
- }
-}
-
-static void encode_residual_lpc(int32_t *res, const int32_t *smp, int n,
- int order, const int32_t *coefs, int shift)
-{
- int i;
- for(i=0; i<order; i++) {
- res[i] = smp[i];
- }
-#ifdef CONFIG_SMALL
- for(i=order; i<n; i+=2) {
- int j;
- int s = smp[i];
- int p0 = 0, p1 = 0;
- for(j=0; j<order; j++) {
- int c = coefs[j];
- p1 += c*s;
- s = smp[i-j-1];
- p0 += c*s;
- }
- res[i ] = smp[i ] - (p0 >> shift);
- res[i+1] = smp[i+1] - (p1 >> shift);
- }
-#else
- switch(order) {
- case 1: encode_residual_lpc_unrolled(res, smp, n, 1, coefs, shift, 0); break;
- case 2: encode_residual_lpc_unrolled(res, smp, n, 2, coefs, shift, 0); break;
- case 3: encode_residual_lpc_unrolled(res, smp, n, 3, coefs, shift, 0); break;
- case 4: encode_residual_lpc_unrolled(res, smp, n, 4, coefs, shift, 0); break;
- case 5: encode_residual_lpc_unrolled(res, smp, n, 5, coefs, shift, 0); break;
- case 6: encode_residual_lpc_unrolled(res, smp, n, 6, coefs, shift, 0); break;
- case 7: encode_residual_lpc_unrolled(res, smp, n, 7, coefs, shift, 0); break;
- case 8: encode_residual_lpc_unrolled(res, smp, n, 8, coefs, shift, 0); break;
- default: encode_residual_lpc_unrolled(res, smp, n, order, coefs, shift, 1); break;
- }
-#endif
-}
-
-static int encode_residual(FlacEncodeContext *ctx, int ch)
-{
- int i, n;
- int min_order, max_order, opt_order, precision, omethod;
- int min_porder, max_porder;
- FlacFrame *frame;
- FlacSubframe *sub;
- int32_t coefs[MAX_LPC_ORDER][MAX_LPC_ORDER];
- int shift[MAX_LPC_ORDER];
- int32_t *res, *smp;
-
- frame = &ctx->frame;
- sub = &frame->subframes[ch];
- res = sub->residual;
- smp = sub->samples;
- n = frame->blocksize;
-
- /* CONSTANT */
- for(i=1; i<n; i++) {
- if(smp[i] != smp[0]) break;
- }
- if(i == n) {
- sub->type = sub->type_code = FLAC_SUBFRAME_CONSTANT;
- res[0] = smp[0];
- return sub->obits;
- }
-
- /* VERBATIM */
- if(n < 5) {
- sub->type = sub->type_code = FLAC_SUBFRAME_VERBATIM;
- encode_residual_verbatim(res, smp, n);
- return sub->obits * n;
- }
-
- min_order = ctx->options.min_prediction_order;
- max_order = ctx->options.max_prediction_order;
- min_porder = ctx->options.min_partition_order;
- max_porder = ctx->options.max_partition_order;
- precision = ctx->options.lpc_coeff_precision;
- omethod = ctx->options.prediction_order_method;
-
- /* FIXED */
- if(!ctx->options.use_lpc || max_order == 0 || (n <= max_order)) {
- uint32_t bits[MAX_FIXED_ORDER+1];
- if(max_order > MAX_FIXED_ORDER) max_order = MAX_FIXED_ORDER;
- opt_order = 0;
- bits[0] = UINT32_MAX;
- for(i=min_order; i<=max_order; i++) {
- encode_residual_fixed(res, smp, n, i);
- bits[i] = calc_rice_params_fixed(&sub->rc, min_porder, max_porder, res,
- n, i, sub->obits);
- if(bits[i] < bits[opt_order]) {
- opt_order = i;
- }
- }
- sub->order = opt_order;
- sub->type = FLAC_SUBFRAME_FIXED;
- sub->type_code = sub->type | sub->order;
- if(sub->order != max_order) {
- encode_residual_fixed(res, smp, n, sub->order);
- return calc_rice_params_fixed(&sub->rc, min_porder, max_porder, res, n,
- sub->order, sub->obits);
- }
- return bits[sub->order];
- }
-
- /* LPC */
- opt_order = lpc_calc_coefs(&ctx->dsp, smp, n, max_order, precision, coefs,
- shift, ctx->options.use_lpc, omethod, MAX_LPC_SHIFT, 0);
-
- if(omethod == ORDER_METHOD_2LEVEL ||
- omethod == ORDER_METHOD_4LEVEL ||
- omethod == ORDER_METHOD_8LEVEL) {
- int levels = 1 << omethod;
- uint32_t bits[levels];
- int order;
- int opt_index = levels-1;
- opt_order = max_order-1;
- bits[opt_index] = UINT32_MAX;
- for(i=levels-1; i>=0; i--) {
- order = min_order + (((max_order-min_order+1) * (i+1)) / levels)-1;
- if(order < 0) order = 0;
- encode_residual_lpc(res, smp, n, order+1, coefs[order], shift[order]);
- bits[i] = calc_rice_params_lpc(&sub->rc, min_porder, max_porder,
- res, n, order+1, sub->obits, precision);
- if(bits[i] < bits[opt_index]) {
- opt_index = i;
- opt_order = order;
- }
- }
- opt_order++;
- } else if(omethod == ORDER_METHOD_SEARCH) {
- // brute-force optimal order search
- uint32_t bits[MAX_LPC_ORDER];
- opt_order = 0;
- bits[0] = UINT32_MAX;
- for(i=min_order-1; i<max_order; i++) {
- encode_residual_lpc(res, smp, n, i+1, coefs[i], shift[i]);
- bits[i] = calc_rice_params_lpc(&sub->rc, min_porder, max_porder,
- res, n, i+1, sub->obits, precision);
- if(bits[i] < bits[opt_order]) {
- opt_order = i;
- }
- }
- opt_order++;
- } else if(omethod == ORDER_METHOD_LOG) {
- uint32_t bits[MAX_LPC_ORDER];
- int step;
-
- opt_order= min_order - 1 + (max_order-min_order)/3;
- memset(bits, -1, sizeof(bits));
-
- for(step=16 ;step; step>>=1){
- int last= opt_order;
- for(i=last-step; i<=last+step; i+= step){
- if(i<min_order-1 || i>=max_order || bits[i] < UINT32_MAX)
- continue;
- encode_residual_lpc(res, smp, n, i+1, coefs[i], shift[i]);
- bits[i] = calc_rice_params_lpc(&sub->rc, min_porder, max_porder,
- res, n, i+1, sub->obits, precision);
- if(bits[i] < bits[opt_order])
- opt_order= i;
- }
- }
- opt_order++;
- }
-
- sub->order = opt_order;
- sub->type = FLAC_SUBFRAME_LPC;
- sub->type_code = sub->type | (sub->order-1);
- sub->shift = shift[sub->order-1];
- for(i=0; i<sub->order; i++) {
- sub->coefs[i] = coefs[sub->order-1][i];
- }
- encode_residual_lpc(res, smp, n, sub->order, sub->coefs, sub->shift);
- return calc_rice_params_lpc(&sub->rc, min_porder, max_porder, res, n, sub->order,
- sub->obits, precision);
-}
-
-static int encode_residual_v(FlacEncodeContext *ctx, int ch)
-{
- int i, n;
- FlacFrame *frame;
- FlacSubframe *sub;
- int32_t *res, *smp;
-
- frame = &ctx->frame;
- sub = &frame->subframes[ch];
- res = sub->residual;
- smp = sub->samples;
- n = frame->blocksize;
-
- /* CONSTANT */
- for(i=1; i<n; i++) {
- if(smp[i] != smp[0]) break;
- }
- if(i == n) {
- sub->type = sub->type_code = FLAC_SUBFRAME_CONSTANT;
- res[0] = smp[0];
- return sub->obits;
- }
-
- /* VERBATIM */
- sub->type = sub->type_code = FLAC_SUBFRAME_VERBATIM;
- encode_residual_verbatim(res, smp, n);
- return sub->obits * n;
-}
-
-static int estimate_stereo_mode(int32_t *left_ch, int32_t *right_ch, int n)
-{
- int i, best;
- int32_t lt, rt;
- uint64_t sum[4];
- uint64_t score[4];
- int k;
-
- /* calculate sum of 2nd order residual for each channel */
- sum[0] = sum[1] = sum[2] = sum[3] = 0;
- for(i=2; i<n; i++) {
- lt = left_ch[i] - 2*left_ch[i-1] + left_ch[i-2];
- rt = right_ch[i] - 2*right_ch[i-1] + right_ch[i-2];
- sum[2] += FFABS((lt + rt) >> 1);
- sum[3] += FFABS(lt - rt);
- sum[0] += FFABS(lt);
- sum[1] += FFABS(rt);
- }
- /* estimate bit counts */
- for(i=0; i<4; i++) {
- k = find_optimal_param(2*sum[i], n);
- sum[i] = rice_encode_count(2*sum[i], n, k);
- }
-
- /* calculate score for each mode */
- score[0] = sum[0] + sum[1];
- score[1] = sum[0] + sum[3];
- score[2] = sum[1] + sum[3];
- score[3] = sum[2] + sum[3];
-
- /* return mode with lowest score */
- best = 0;
- for(i=1; i<4; i++) {
- if(score[i] < score[best]) {
- best = i;
- }
- }
- if(best == 0) {
- return FLAC_CHMODE_LEFT_RIGHT;
- } else if(best == 1) {
- return FLAC_CHMODE_LEFT_SIDE;
- } else if(best == 2) {
- return FLAC_CHMODE_RIGHT_SIDE;
- } else {
- return FLAC_CHMODE_MID_SIDE;
- }
-}
-
-/**
- * Perform stereo channel decorrelation
- */
-static void channel_decorrelation(FlacEncodeContext *ctx)
-{
- FlacFrame *frame;
- int32_t *left, *right;
- int i, n;
-
- frame = &ctx->frame;
- n = frame->blocksize;
- left = frame->subframes[0].samples;
- right = frame->subframes[1].samples;
-
- if(ctx->channels != 2) {
- frame->ch_mode = FLAC_CHMODE_NOT_STEREO;
- return;
- }
-
- frame->ch_mode = estimate_stereo_mode(left, right, n);
-
- /* perform decorrelation and adjust bits-per-sample */
- if(frame->ch_mode == FLAC_CHMODE_LEFT_RIGHT) {
- return;
- }
- if(frame->ch_mode == FLAC_CHMODE_MID_SIDE) {
- int32_t tmp;
- for(i=0; i<n; i++) {
- tmp = left[i];
- left[i] = (tmp + right[i]) >> 1;
- right[i] = tmp - right[i];
- }
- frame->subframes[1].obits++;
- } else if(frame->ch_mode == FLAC_CHMODE_LEFT_SIDE) {
- for(i=0; i<n; i++) {
- right[i] = left[i] - right[i];
- }
- frame->subframes[1].obits++;
- } else {
- for(i=0; i<n; i++) {
- left[i] -= right[i];
- }
- frame->subframes[0].obits++;
- }
-}
-
-static void write_utf8(PutBitContext *pb, uint32_t val)
-{
- uint8_t tmp;
- PUT_UTF8(val, tmp, put_bits(pb, 8, tmp);)
-}
-
-static void output_frame_header(FlacEncodeContext *s)
-{
- FlacFrame *frame;
- int crc;
-
- frame = &s->frame;
-
- put_bits(&s->pb, 16, 0xFFF8);
- put_bits(&s->pb, 4, frame->bs_code[0]);
- put_bits(&s->pb, 4, s->sr_code[0]);
- if(frame->ch_mode == FLAC_CHMODE_NOT_STEREO) {
- put_bits(&s->pb, 4, s->ch_code);
- } else {
- put_bits(&s->pb, 4, frame->ch_mode);
- }
- put_bits(&s->pb, 3, 4); /* bits-per-sample code */
- put_bits(&s->pb, 1, 0);
- write_utf8(&s->pb, s->frame_count);
- if(frame->bs_code[0] == 6) {
- put_bits(&s->pb, 8, frame->bs_code[1]);
- } else if(frame->bs_code[0] == 7) {
- put_bits(&s->pb, 16, frame->bs_code[1]);
- }
- if(s->sr_code[0] == 12) {
- put_bits(&s->pb, 8, s->sr_code[1]);
- } else if(s->sr_code[0] > 12) {
- put_bits(&s->pb, 16, s->sr_code[1]);
- }
- flush_put_bits(&s->pb);
- crc = av_crc(av_crc_get_table(AV_CRC_8_ATM), 0,
- s->pb.buf, put_bits_count(&s->pb)>>3);
- put_bits(&s->pb, 8, crc);
-}
-
-static void output_subframe_constant(FlacEncodeContext *s, int ch)
-{
- FlacSubframe *sub;
- int32_t res;
-
- sub = &s->frame.subframes[ch];
- res = sub->residual[0];
- put_sbits(&s->pb, sub->obits, res);
-}
-
-static void output_subframe_verbatim(FlacEncodeContext *s, int ch)
-{
- int i;
- FlacFrame *frame;
- FlacSubframe *sub;
- int32_t res;
-
- frame = &s->frame;
- sub = &frame->subframes[ch];
-
- for(i=0; i<frame->blocksize; i++) {
- res = sub->residual[i];
- put_sbits(&s->pb, sub->obits, res);
- }
-}
-
-static void output_residual(FlacEncodeContext *ctx, int ch)
-{
- int i, j, p, n, parts;
- int k, porder, psize, res_cnt;
- FlacFrame *frame;
- FlacSubframe *sub;
- int32_t *res;
-
- frame = &ctx->frame;
- sub = &frame->subframes[ch];
- res = sub->residual;
- n = frame->blocksize;
-
- /* rice-encoded block */
- put_bits(&ctx->pb, 2, 0);
-
- /* partition order */
- porder = sub->rc.porder;
- psize = n >> porder;
- parts = (1 << porder);
- put_bits(&ctx->pb, 4, porder);
- res_cnt = psize - sub->order;
-
- /* residual */
- j = sub->order;
- for(p=0; p<parts; p++) {
- k = sub->rc.params[p];
- put_bits(&ctx->pb, 4, k);
- if(p == 1) res_cnt = psize;
- for(i=0; i<res_cnt && j<n; i++, j++) {
- set_sr_golomb_flac(&ctx->pb, res[j], k, INT32_MAX, 0);
- }
- }
-}
-
-static void output_subframe_fixed(FlacEncodeContext *ctx, int ch)
-{
- int i;
- FlacFrame *frame;
- FlacSubframe *sub;
-
- frame = &ctx->frame;
- sub = &frame->subframes[ch];
-
- /* warm-up samples */
- for(i=0; i<sub->order; i++) {
- put_sbits(&ctx->pb, sub->obits, sub->residual[i]);
- }
-
- /* residual */
- output_residual(ctx, ch);
-}
-
-static void output_subframe_lpc(FlacEncodeContext *ctx, int ch)
-{
- int i, cbits;
- FlacFrame *frame;
- FlacSubframe *sub;
-
- frame = &ctx->frame;
- sub = &frame->subframes[ch];
-
- /* warm-up samples */
- for(i=0; i<sub->order; i++) {
- put_sbits(&ctx->pb, sub->obits, sub->residual[i]);
- }
-
- /* LPC coefficients */
- cbits = ctx->options.lpc_coeff_precision;
- put_bits(&ctx->pb, 4, cbits-1);
- put_sbits(&ctx->pb, 5, sub->shift);
- for(i=0; i<sub->order; i++) {
- put_sbits(&ctx->pb, cbits, sub->coefs[i]);
- }
-
- /* residual */
- output_residual(ctx, ch);
-}
-
-static void output_subframes(FlacEncodeContext *s)
-{
- FlacFrame *frame;
- FlacSubframe *sub;
- int ch;
-
- frame = &s->frame;
-
- for(ch=0; ch<s->channels; ch++) {
- sub = &frame->subframes[ch];
-
- /* subframe header */
- put_bits(&s->pb, 1, 0);
- put_bits(&s->pb, 6, sub->type_code);
- put_bits(&s->pb, 1, 0); /* no wasted bits */
-
- /* subframe */
- if(sub->type == FLAC_SUBFRAME_CONSTANT) {
- output_subframe_constant(s, ch);
- } else if(sub->type == FLAC_SUBFRAME_VERBATIM) {
- output_subframe_verbatim(s, ch);
- } else if(sub->type == FLAC_SUBFRAME_FIXED) {
- output_subframe_fixed(s, ch);
- } else if(sub->type == FLAC_SUBFRAME_LPC) {
- output_subframe_lpc(s, ch);
- }
- }
-}
-
-static void output_frame_footer(FlacEncodeContext *s)
-{
- int crc;
- flush_put_bits(&s->pb);
- crc = bswap_16(av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0,
- s->pb.buf, put_bits_count(&s->pb)>>3));
- put_bits(&s->pb, 16, crc);
- flush_put_bits(&s->pb);
-}
-
-static int flac_encode_frame(AVCodecContext *avctx, uint8_t *frame,
- int buf_size, void *data)
-{
- int ch;
- FlacEncodeContext *s;
- int16_t *samples = data;
- int out_bytes;
-
- s = avctx->priv_data;
-
- init_frame(s);
-
- copy_samples(s, samples);
-
- channel_decorrelation(s);
-
- for(ch=0; ch<s->channels; ch++) {
- encode_residual(s, ch);
- }
- init_put_bits(&s->pb, frame, buf_size);
- output_frame_header(s);
- output_subframes(s);
- output_frame_footer(s);
- out_bytes = put_bits_count(&s->pb) >> 3;
-
- if(out_bytes > s->max_framesize || out_bytes >= buf_size) {
- /* frame too large. use verbatim mode */
- for(ch=0; ch<s->channels; ch++) {
- encode_residual_v(s, ch);
- }
- init_put_bits(&s->pb, frame, buf_size);
- output_frame_header(s);
- output_subframes(s);
- output_frame_footer(s);
- out_bytes = put_bits_count(&s->pb) >> 3;
-
- if(out_bytes > s->max_framesize || out_bytes >= buf_size) {
- /* still too large. must be an error. */
- av_log(avctx, AV_LOG_ERROR, "error encoding frame\n");
- return -1;
- }
- }
-
- s->frame_count++;
- return out_bytes;
-}
-
-static av_cold int flac_encode_close(AVCodecContext *avctx)
-{
- av_freep(&avctx->extradata);
- avctx->extradata_size = 0;
- av_freep(&avctx->coded_frame);
- return 0;
-}
-
-AVCodec flac_encoder = {
- "flac",
- CODEC_TYPE_AUDIO,
- CODEC_ID_FLAC,
- sizeof(FlacEncodeContext),
- flac_encode_init,
- flac_encode_frame,
- flac_encode_close,
- NULL,
- .capabilities = CODEC_CAP_SMALL_LAST_FRAME,
- .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
- .long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
-};
Copied: trunk/libavcodec/lpc.h (from r14789, /trunk/libavcodec/flacenc.c)
==============================================================================
--- /trunk/libavcodec/flacenc.c (original)
+++ trunk/libavcodec/lpc.h Sat Aug 16 19:18:20 2008
@@ -1,5 +1,5 @@
/**
- * FLAC audio encoder
+ * LPC utility code
* Copyright (c) 2006 Justin Ruggles <jruggle at earthlink.net>
*
* This file is part of FFmpeg.
@@ -19,27 +19,10 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include "libavutil/crc.h"
-#include "libavutil/lls.h"
-#include "avcodec.h"
-#include "bitstream.h"
-#include "dsputil.h"
-#include "golomb.h"
-
-#define FLAC_MAX_CH 8
-#define FLAC_MIN_BLOCKSIZE 16
-#define FLAC_MAX_BLOCKSIZE 65535
-
-#define FLAC_SUBFRAME_CONSTANT 0
-#define FLAC_SUBFRAME_VERBATIM 1
-#define FLAC_SUBFRAME_FIXED 8
-#define FLAC_SUBFRAME_LPC 32
+#ifndef FFMPEG_LPC_H
+#define FFMPEG_LPC_H
-#define FLAC_CHMODE_NOT_STEREO 0
-#define FLAC_CHMODE_LEFT_RIGHT 1
-#define FLAC_CHMODE_LEFT_SIDE 8
-#define FLAC_CHMODE_RIGHT_SIDE 9
-#define FLAC_CHMODE_MID_SIDE 10
+#include <inttypes.h>
#define ORDER_METHOD_EST 0
#define ORDER_METHOD_2LEVEL 1
@@ -48,1444 +31,16 @@
#define ORDER_METHOD_SEARCH 4
#define ORDER_METHOD_LOG 5
-#define FLAC_STREAMINFO_SIZE 34
-
#define MIN_LPC_ORDER 1
#define MAX_LPC_ORDER 32
-#define MAX_FIXED_ORDER 4
-#define MAX_PARTITION_ORDER 8
-#define MAX_PARTITIONS (1 << MAX_PARTITION_ORDER)
-#define MAX_LPC_PRECISION 15
-#define MAX_LPC_SHIFT 15
-#define MAX_RICE_PARAM 14
-
-typedef struct CompressionOptions {
- int compression_level;
- int block_time_ms;
- int use_lpc;
- int lpc_coeff_precision;
- int min_prediction_order;
- int max_prediction_order;
- int prediction_order_method;
- int min_partition_order;
- int max_partition_order;
-} CompressionOptions;
-
-typedef struct RiceContext {
- int porder;
- int params[MAX_PARTITIONS];
-} RiceContext;
-
-typedef struct FlacSubframe {
- int type;
- int type_code;
- int obits;
- int order;
- int32_t coefs[MAX_LPC_ORDER];
- int shift;
- RiceContext rc;
- int32_t samples[FLAC_MAX_BLOCKSIZE];
- int32_t residual[FLAC_MAX_BLOCKSIZE+1];
-} FlacSubframe;
-
-typedef struct FlacFrame {
- FlacSubframe subframes[FLAC_MAX_CH];
- int blocksize;
- int bs_code[2];
- uint8_t crc8;
- int ch_mode;
-} FlacFrame;
-
-typedef struct FlacEncodeContext {
- PutBitContext pb;
- int channels;
- int ch_code;
- int samplerate;
- int sr_code[2];
- int max_framesize;
- uint32_t frame_count;
- FlacFrame frame;
- CompressionOptions options;
- AVCodecContext *avctx;
- DSPContext dsp;
-} FlacEncodeContext;
-
-static const int flac_samplerates[16] = {
- 0, 0, 0, 0,
- 8000, 16000, 22050, 24000, 32000, 44100, 48000, 96000,
- 0, 0, 0, 0
-};
-
-static const int flac_blocksizes[16] = {
- 0,
- 192,
- 576, 1152, 2304, 4608,
- 0, 0,
- 256, 512, 1024, 2048, 4096, 8192, 16384, 32768
-};
-
-/**
- * Writes streaminfo metadata block to byte array
- */
-static void write_streaminfo(FlacEncodeContext *s, uint8_t *header)
-{
- PutBitContext pb;
-
- memset(header, 0, FLAC_STREAMINFO_SIZE);
- init_put_bits(&pb, header, FLAC_STREAMINFO_SIZE);
-
- /* streaminfo metadata block */
- put_bits(&pb, 16, s->avctx->frame_size);
- put_bits(&pb, 16, s->avctx->frame_size);
- put_bits(&pb, 24, 0);
- put_bits(&pb, 24, s->max_framesize);
- put_bits(&pb, 20, s->samplerate);
- put_bits(&pb, 3, s->channels-1);
- put_bits(&pb, 5, 15); /* bits per sample - 1 */
- flush_put_bits(&pb);
- /* total samples = 0 */
- /* MD5 signature = 0 */
-}
-
-/**
- * Sets blocksize based on samplerate
- * Chooses the closest predefined blocksize >= BLOCK_TIME_MS milliseconds
- */
-static int select_blocksize(int samplerate, int block_time_ms)
-{
- int i;
- int target;
- int blocksize;
-
- assert(samplerate > 0);
- blocksize = flac_blocksizes[1];
- target = (samplerate * block_time_ms) / 1000;
- for(i=0; i<16; i++) {
- if(target >= flac_blocksizes[i] && flac_blocksizes[i] > blocksize) {
- blocksize = flac_blocksizes[i];
- }
- }
- return blocksize;
-}
-
-static av_cold int flac_encode_init(AVCodecContext *avctx)
-{
- int freq = avctx->sample_rate;
- int channels = avctx->channels;
- FlacEncodeContext *s = avctx->priv_data;
- int i, level;
- uint8_t *streaminfo;
-
- s->avctx = avctx;
-
- dsputil_init(&s->dsp, avctx);
-
- if(avctx->sample_fmt != SAMPLE_FMT_S16) {
- return -1;
- }
-
- if(channels < 1 || channels > FLAC_MAX_CH) {
- return -1;
- }
- s->channels = channels;
- s->ch_code = s->channels-1;
-
- /* find samplerate in table */
- if(freq < 1)
- return -1;
- for(i=4; i<12; i++) {
- if(freq == flac_samplerates[i]) {
- s->samplerate = flac_samplerates[i];
- s->sr_code[0] = i;
- s->sr_code[1] = 0;
- break;
- }
- }
- /* if not in table, samplerate is non-standard */
- if(i == 12) {
- if(freq % 1000 == 0 && freq < 255000) {
- s->sr_code[0] = 12;
- s->sr_code[1] = freq / 1000;
- } else if(freq % 10 == 0 && freq < 655350) {
- s->sr_code[0] = 14;
- s->sr_code[1] = freq / 10;
- } else if(freq < 65535) {
- s->sr_code[0] = 13;
- s->sr_code[1] = freq;
- } else {
- return -1;
- }
- s->samplerate = freq;
- }
-
- /* set compression option defaults based on avctx->compression_level */
- if(avctx->compression_level < 0) {
- s->options.compression_level = 5;
- } else {
- s->options.compression_level = avctx->compression_level;
- }
- av_log(avctx, AV_LOG_DEBUG, " compression: %d\n", s->options.compression_level);
-
- level= s->options.compression_level;
- if(level > 12) {
- av_log(avctx, AV_LOG_ERROR, "invalid compression level: %d\n",
- s->options.compression_level);
- return -1;
- }
-
- s->options.block_time_ms = ((int[]){ 27, 27, 27,105,105,105,105,105,105,105,105,105,105})[level];
- s->options.use_lpc = ((int[]){ 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1})[level];
- s->options.min_prediction_order= ((int[]){ 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1})[level];
- s->options.max_prediction_order= ((int[]){ 3, 4, 4, 6, 8, 8, 8, 8, 12, 12, 12, 32, 32})[level];
- s->options.prediction_order_method = ((int[]){ ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST,
- ORDER_METHOD_EST, ORDER_METHOD_EST, ORDER_METHOD_EST,
- ORDER_METHOD_4LEVEL, ORDER_METHOD_LOG, ORDER_METHOD_4LEVEL,
- ORDER_METHOD_LOG, ORDER_METHOD_SEARCH, ORDER_METHOD_LOG,
- ORDER_METHOD_SEARCH})[level];
- s->options.min_partition_order = ((int[]){ 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})[level];
- s->options.max_partition_order = ((int[]){ 2, 2, 3, 3, 3, 8, 8, 8, 8, 8, 8, 8, 8})[level];
-
- /* set compression option overrides from AVCodecContext */
- if(avctx->use_lpc >= 0) {
- s->options.use_lpc = av_clip(avctx->use_lpc, 0, 11);
- }
- if(s->options.use_lpc == 1)
- av_log(avctx, AV_LOG_DEBUG, " use lpc: Levinson-Durbin recursion with Welch window\n");
- else if(s->options.use_lpc > 1)
- av_log(avctx, AV_LOG_DEBUG, " use lpc: Cholesky factorization\n");
-
- if(avctx->min_prediction_order >= 0) {
- if(s->options.use_lpc) {
- if(avctx->min_prediction_order < MIN_LPC_ORDER ||
- avctx->min_prediction_order > MAX_LPC_ORDER) {
- av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n",
- avctx->min_prediction_order);
- return -1;
- }
- } else {
- if(avctx->min_prediction_order > MAX_FIXED_ORDER) {
- av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n",
- avctx->min_prediction_order);
- return -1;
- }
- }
- s->options.min_prediction_order = avctx->min_prediction_order;
- }
- if(avctx->max_prediction_order >= 0) {
- if(s->options.use_lpc) {
- if(avctx->max_prediction_order < MIN_LPC_ORDER ||
- avctx->max_prediction_order > MAX_LPC_ORDER) {
- av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n",
- avctx->max_prediction_order);
- return -1;
- }
- } else {
- if(avctx->max_prediction_order > MAX_FIXED_ORDER) {
- av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n",
- avctx->max_prediction_order);
- return -1;
- }
- }
- s->options.max_prediction_order = avctx->max_prediction_order;
- }
- if(s->options.max_prediction_order < s->options.min_prediction_order) {
- av_log(avctx, AV_LOG_ERROR, "invalid prediction orders: min=%d max=%d\n",
- s->options.min_prediction_order, s->options.max_prediction_order);
- return -1;
- }
- av_log(avctx, AV_LOG_DEBUG, " prediction order: %d, %d\n",
- s->options.min_prediction_order, s->options.max_prediction_order);
-
- if(avctx->prediction_order_method >= 0) {
- if(avctx->prediction_order_method > ORDER_METHOD_LOG) {
- av_log(avctx, AV_LOG_ERROR, "invalid prediction order method: %d\n",
- avctx->prediction_order_method);
- return -1;
- }
- s->options.prediction_order_method = avctx->prediction_order_method;
- }
- switch(s->options.prediction_order_method) {
- case ORDER_METHOD_EST: av_log(avctx, AV_LOG_DEBUG, " order method: %s\n",
- "estimate"); break;
- case ORDER_METHOD_2LEVEL: av_log(avctx, AV_LOG_DEBUG, " order method: %s\n",
- "2-level"); break;
- case ORDER_METHOD_4LEVEL: av_log(avctx, AV_LOG_DEBUG, " order method: %s\n",
- "4-level"); break;
- case ORDER_METHOD_8LEVEL: av_log(avctx, AV_LOG_DEBUG, " order method: %s\n",
- "8-level"); break;
- case ORDER_METHOD_SEARCH: av_log(avctx, AV_LOG_DEBUG, " order method: %s\n",
- "full search"); break;
- case ORDER_METHOD_LOG: av_log(avctx, AV_LOG_DEBUG, " order method: %s\n",
- "log search"); break;
- }
-
- if(avctx->min_partition_order >= 0) {
- if(avctx->min_partition_order > MAX_PARTITION_ORDER) {
- av_log(avctx, AV_LOG_ERROR, "invalid min partition order: %d\n",
- avctx->min_partition_order);
- return -1;
- }
- s->options.min_partition_order = avctx->min_partition_order;
- }
- if(avctx->max_partition_order >= 0) {
- if(avctx->max_partition_order > MAX_PARTITION_ORDER) {
- av_log(avctx, AV_LOG_ERROR, "invalid max partition order: %d\n",
- avctx->max_partition_order);
- return -1;
- }
- s->options.max_partition_order = avctx->max_partition_order;
- }
- if(s->options.max_partition_order < s->options.min_partition_order) {
- av_log(avctx, AV_LOG_ERROR, "invalid partition orders: min=%d max=%d\n",
- s->options.min_partition_order, s->options.max_partition_order);
- return -1;
- }
- av_log(avctx, AV_LOG_DEBUG, " partition order: %d, %d\n",
- s->options.min_partition_order, s->options.max_partition_order);
-
- if(avctx->frame_size > 0) {
- if(avctx->frame_size < FLAC_MIN_BLOCKSIZE ||
- avctx->frame_size > FLAC_MAX_BLOCKSIZE) {
- av_log(avctx, AV_LOG_ERROR, "invalid block size: %d\n",
- avctx->frame_size);
- return -1;
- }
- } else {
- s->avctx->frame_size = select_blocksize(s->samplerate, s->options.block_time_ms);
- }
- av_log(avctx, AV_LOG_DEBUG, " block size: %d\n", s->avctx->frame_size);
-
- /* set LPC precision */
- if(avctx->lpc_coeff_precision > 0) {
- if(avctx->lpc_coeff_precision > MAX_LPC_PRECISION) {
- av_log(avctx, AV_LOG_ERROR, "invalid lpc coeff precision: %d\n",
- avctx->lpc_coeff_precision);
- return -1;
- }
- s->options.lpc_coeff_precision = avctx->lpc_coeff_precision;
- } else {
- /* default LPC precision */
- s->options.lpc_coeff_precision = 15;
- }
- av_log(avctx, AV_LOG_DEBUG, " lpc precision: %d\n",
- s->options.lpc_coeff_precision);
-
- /* set maximum encoded frame size in verbatim mode */
- if(s->channels == 2) {
- s->max_framesize = 14 + ((s->avctx->frame_size * 33 + 7) >> 3);
- } else {
- s->max_framesize = 14 + (s->avctx->frame_size * s->channels * 2);
- }
-
- streaminfo = av_malloc(FLAC_STREAMINFO_SIZE);
- write_streaminfo(s, streaminfo);
- avctx->extradata = streaminfo;
- avctx->extradata_size = FLAC_STREAMINFO_SIZE;
-
- s->frame_count = 0;
-
- avctx->coded_frame = avcodec_alloc_frame();
- avctx->coded_frame->key_frame = 1;
-
- return 0;
-}
-
-static void init_frame(FlacEncodeContext *s)
-{
- int i, ch;
- FlacFrame *frame;
-
- frame = &s->frame;
-
- for(i=0; i<16; i++) {
- if(s->avctx->frame_size == flac_blocksizes[i]) {
- frame->blocksize = flac_blocksizes[i];
- frame->bs_code[0] = i;
- frame->bs_code[1] = 0;
- break;
- }
- }
- if(i == 16) {
- frame->blocksize = s->avctx->frame_size;
- if(frame->blocksize <= 256) {
- frame->bs_code[0] = 6;
- frame->bs_code[1] = frame->blocksize-1;
- } else {
- frame->bs_code[0] = 7;
- frame->bs_code[1] = frame->blocksize-1;
- }
- }
-
- for(ch=0; ch<s->channels; ch++) {
- frame->subframes[ch].obits = 16;
- }
-}
-
-/**
- * Copy channel-interleaved input samples into separate subframes
- */
-static void copy_samples(FlacEncodeContext *s, int16_t *samples)
-{
- int i, j, ch;
- FlacFrame *frame;
-
- frame = &s->frame;
- for(i=0,j=0; i<frame->blocksize; i++) {
- for(ch=0; ch<s->channels; ch++,j++) {
- frame->subframes[ch].samples[i] = samples[j];
- }
- }
-}
-#define rice_encode_count(sum, n, k) (((n)*((k)+1))+((sum-(n>>1))>>(k)))
-
-/**
- * Solve for d/dk(rice_encode_count) = n-((sum-(n>>1))>>(k+1)) = 0
- */
-static int find_optimal_param(uint32_t sum, int n)
-{
- int k;
- uint32_t sum2;
-
- if(sum <= n>>1)
- return 0;
- sum2 = sum-(n>>1);
- k = av_log2(n<256 ? FASTDIV(sum2,n) : sum2/n);
- return FFMIN(k, MAX_RICE_PARAM);
-}
-
-static uint32_t calc_optimal_rice_params(RiceContext *rc, int porder,
- uint32_t *sums, int n, int pred_order)
-{
- int i;
- int k, cnt, part;
- uint32_t all_bits;
-
- part = (1 << porder);
- all_bits = 4 * part;
-
- cnt = (n >> porder) - pred_order;
- for(i=0; i<part; i++) {
- k = find_optimal_param(sums[i], cnt);
- rc->params[i] = k;
- all_bits += rice_encode_count(sums[i], cnt, k);
- cnt = n >> porder;
- }
-
- rc->porder = porder;
-
- return all_bits;
-}
-
-static void calc_sums(int pmin, int pmax, uint32_t *data, int n, int pred_order,
- uint32_t sums[][MAX_PARTITIONS])
-{
- int i, j;
- int parts;
- uint32_t *res, *res_end;
-
- /* sums for highest level */
- parts = (1 << pmax);
- res = &data[pred_order];
- res_end = &data[n >> pmax];
- for(i=0; i<parts; i++) {
- uint32_t sum = 0;
- while(res < res_end){
- sum += *(res++);
- }
- sums[pmax][i] = sum;
- res_end+= n >> pmax;
- }
- /* sums for lower levels */
- for(i=pmax-1; i>=pmin; i--) {
- parts = (1 << i);
- for(j=0; j<parts; j++) {
- sums[i][j] = sums[i+1][2*j] + sums[i+1][2*j+1];
- }
- }
-}
-
-static uint32_t calc_rice_params(RiceContext *rc, int pmin, int pmax,
- int32_t *data, int n, int pred_order)
-{
- int i;
- uint32_t bits[MAX_PARTITION_ORDER+1];
- int opt_porder;
- RiceContext tmp_rc;
- uint32_t *udata;
- uint32_t sums[MAX_PARTITION_ORDER+1][MAX_PARTITIONS];
-
- assert(pmin >= 0 && pmin <= MAX_PARTITION_ORDER);
- assert(pmax >= 0 && pmax <= MAX_PARTITION_ORDER);
- assert(pmin <= pmax);
-
- udata = av_malloc(n * sizeof(uint32_t));
- for(i=0; i<n; i++) {
- udata[i] = (2*data[i]) ^ (data[i]>>31);
- }
-
- calc_sums(pmin, pmax, udata, n, pred_order, sums);
-
- opt_porder = pmin;
- bits[pmin] = UINT32_MAX;
- for(i=pmin; i<=pmax; i++) {
- bits[i] = calc_optimal_rice_params(&tmp_rc, i, sums[i], n, pred_order);
- if(bits[i] <= bits[opt_porder]) {
- opt_porder = i;
- *rc= tmp_rc;
- }
- }
-
- av_freep(&udata);
- return bits[opt_porder];
-}
-
-static int get_max_p_order(int max_porder, int n, int order)
-{
- int porder = FFMIN(max_porder, av_log2(n^(n-1)));
- if(order > 0)
- porder = FFMIN(porder, av_log2(n/order));
- return porder;
-}
-
-static uint32_t calc_rice_params_fixed(RiceContext *rc, int pmin, int pmax,
- int32_t *data, int n, int pred_order,
- int bps)
-{
- uint32_t bits;
- pmin = get_max_p_order(pmin, n, pred_order);
- pmax = get_max_p_order(pmax, n, pred_order);
- bits = pred_order*bps + 6;
- bits += calc_rice_params(rc, pmin, pmax, data, n, pred_order);
- return bits;
-}
-
-static uint32_t calc_rice_params_lpc(RiceContext *rc, int pmin, int pmax,
- int32_t *data, int n, int pred_order,
- int bps, int precision)
-{
- uint32_t bits;
- pmin = get_max_p_order(pmin, n, pred_order);
- pmax = get_max_p_order(pmax, n, pred_order);
- bits = pred_order*bps + 4 + 5 + pred_order*precision + 6;
- bits += calc_rice_params(rc, pmin, pmax, data, n, pred_order);
- return bits;
-}
-
-/**
- * Apply Welch window function to audio block
- */
-static void apply_welch_window(const int32_t *data, int len, double *w_data)
-{
- int i, n2;
- double w;
- double c;
-
- assert(!(len&1)); //the optimization in r11881 does not support odd len
- //if someone wants odd len extend the change in r11881
-
- n2 = (len >> 1);
- c = 2.0 / (len - 1.0);
-
- w_data+=n2;
- data+=n2;
- for(i=0; i<n2; i++) {
- w = c - n2 + i;
- w = 1.0 - (w * w);
- w_data[-i-1] = data[-i-1] * w;
- w_data[+i ] = data[+i ] * w;
- }
-}
-
-/**
- * Calculates autocorrelation data from audio samples
- * A Welch window function is applied before calculation.
- */
-void ff_flac_compute_autocorr(const int32_t *data, int len, int lag,
- double *autoc)
-{
- int i, j;
- double tmp[len + lag + 1];
- double *data1= tmp + lag;
-
- apply_welch_window(data, len, data1);
-
- for(j=0; j<lag; j++)
- data1[j-lag]= 0.0;
- data1[len] = 0.0;
-
- for(j=0; j<lag; j+=2){
- double sum0 = 1.0, sum1 = 1.0;
- for(i=0; i<len; i++){
- sum0 += data1[i] * data1[i-j];
- sum1 += data1[i] * data1[i-j-1];
- }
- autoc[j ] = sum0;
- autoc[j+1] = sum1;
- }
-
- if(j==lag){
- double sum = 1.0;
- for(i=0; i<len; i+=2){
- sum += data1[i ] * data1[i-j ]
- + data1[i+1] * data1[i-j+1];
- }
- autoc[j] = sum;
- }
-}
-
-/**
- * Levinson-Durbin recursion.
- * Produces LPC coefficients from autocorrelation data.
- */
-static void compute_lpc_coefs(const double *autoc, int max_order,
- double lpc[][MAX_LPC_ORDER], double *ref)
-{
- int i, j, i2;
- double r, err, tmp;
- double lpc_tmp[MAX_LPC_ORDER];
-
- for(i=0; i<max_order; i++) lpc_tmp[i] = 0;
- err = autoc[0];
-
- for(i=0; i<max_order; i++) {
- r = -autoc[i+1];
- for(j=0; j<i; j++) {
- r -= lpc_tmp[j] * autoc[i-j];
- }
- r /= err;
- ref[i] = fabs(r);
-
- err *= 1.0 - (r * r);
-
- i2 = (i >> 1);
- lpc_tmp[i] = r;
- for(j=0; j<i2; j++) {
- tmp = lpc_tmp[j];
- lpc_tmp[j] += r * lpc_tmp[i-1-j];
- lpc_tmp[i-1-j] += r * tmp;
- }
- if(i & 1) {
- lpc_tmp[j] += lpc_tmp[j] * r;
- }
-
- for(j=0; j<=i; j++) {
- lpc[i][j] = -lpc_tmp[j];
- }
- }
-}
-
-/**
- * Quantize LPC coefficients
- */
-static void quantize_lpc_coefs(double *lpc_in, int order, int precision,
- int32_t *lpc_out, int *shift, int max_shift, int zero_shift)
-{
- int i;
- double cmax, error;
- int32_t qmax;
- int sh;
-
- /* define maximum levels */
- qmax = (1 << (precision - 1)) - 1;
-
- /* find maximum coefficient value */
- cmax = 0.0;
- for(i=0; i<order; i++) {
- cmax= FFMAX(cmax, fabs(lpc_in[i]));
- }
-
- /* if maximum value quantizes to zero, return all zeros */
- if(cmax * (1 << max_shift) < 1.0) {
- *shift = zero_shift;
- memset(lpc_out, 0, sizeof(int32_t) * order);
- return;
- }
-
- /* calculate level shift which scales max coeff to available bits */
- sh = max_shift;
- while((cmax * (1 << sh) > qmax) && (sh > 0)) {
- sh--;
- }
-
- /* since negative shift values are unsupported in decoder, scale down
- coefficients instead */
- if(sh == 0 && cmax > qmax) {
- double scale = ((double)qmax) / cmax;
- for(i=0; i<order; i++) {
- lpc_in[i] *= scale;
- }
- }
-
- /* output quantized coefficients and level shift */
- error=0;
- for(i=0; i<order; i++) {
- error += lpc_in[i] * (1 << sh);
- lpc_out[i] = av_clip(lrintf(error), -qmax, qmax);
- error -= lpc_out[i];
- }
- *shift = sh;
-}
-
-static int estimate_best_order(double *ref, int max_order)
-{
- int i, est;
-
- est = 1;
- for(i=max_order-1; i>=0; i--) {
- if(ref[i] > 0.10) {
- est = i+1;
- break;
- }
- }
- return est;
-}
-
/**
* Calculate LPC coefficients for multiple orders
*/
-static int lpc_calc_coefs(DSPContext *s,
+int ff_lpc_calc_coefs(DSPContext *s,
const int32_t *samples, int blocksize, int max_order,
int precision, int32_t coefs[][MAX_LPC_ORDER],
- int *shift, int use_lpc, int omethod, int max_shift, int zero_shift)
-{
- double autoc[MAX_LPC_ORDER+1];
- double ref[MAX_LPC_ORDER];
- double lpc[MAX_LPC_ORDER][MAX_LPC_ORDER];
- int i, j, pass;
- int opt_order;
-
- assert(max_order >= MIN_LPC_ORDER && max_order <= MAX_LPC_ORDER);
-
- if(use_lpc == 1){
- s->flac_compute_autocorr(samples, blocksize, max_order, autoc);
-
- compute_lpc_coefs(autoc, max_order, lpc, ref);
- }else{
- LLSModel m[2];
- double var[MAX_LPC_ORDER+1], weight;
-
- for(pass=0; pass<use_lpc-1; pass++){
- av_init_lls(&m[pass&1], max_order);
-
- weight=0;
- for(i=max_order; i<blocksize; i++){
- for(j=0; j<=max_order; j++)
- var[j]= samples[i-j];
-
- if(pass){
- double eval, inv, rinv;
- eval= av_evaluate_lls(&m[(pass-1)&1], var+1, max_order-1);
- eval= (512>>pass) + fabs(eval - var[0]);
- inv = 1/eval;
- rinv = sqrt(inv);
- for(j=0; j<=max_order; j++)
- var[j] *= rinv;
- weight += inv;
- }else
- weight++;
-
- av_update_lls(&m[pass&1], var, 1.0);
- }
- av_solve_lls(&m[pass&1], 0.001, 0);
- }
-
- for(i=0; i<max_order; i++){
- for(j=0; j<max_order; j++)
- lpc[i][j]= m[(pass-1)&1].coeff[i][j];
- ref[i]= sqrt(m[(pass-1)&1].variance[i] / weight) * (blocksize - max_order) / 4000;
- }
- for(i=max_order-1; i>0; i--)
- ref[i] = ref[i-1] - ref[i];
- }
- opt_order = max_order;
-
- if(omethod == ORDER_METHOD_EST) {
- opt_order = estimate_best_order(ref, max_order);
- i = opt_order-1;
- quantize_lpc_coefs(lpc[i], i+1, precision, coefs[i], &shift[i], max_shift, zero_shift);
- } else {
- for(i=0; i<max_order; i++) {
- quantize_lpc_coefs(lpc[i], i+1, precision, coefs[i], &shift[i], max_shift, zero_shift);
- }
- }
-
- return opt_order;
-}
-
-
-static void encode_residual_verbatim(int32_t *res, int32_t *smp, int n)
-{
- assert(n > 0);
- memcpy(res, smp, n * sizeof(int32_t));
-}
-
-static void encode_residual_fixed(int32_t *res, const int32_t *smp, int n,
- int order)
-{
- int i;
-
- for(i=0; i<order; i++) {
- res[i] = smp[i];
- }
-
- if(order==0){
- for(i=order; i<n; i++)
- res[i]= smp[i];
- }else if(order==1){
- for(i=order; i<n; i++)
- res[i]= smp[i] - smp[i-1];
- }else if(order==2){
- int a = smp[order-1] - smp[order-2];
- for(i=order; i<n; i+=2) {
- int b = smp[i] - smp[i-1];
- res[i]= b - a;
- a = smp[i+1] - smp[i];
- res[i+1]= a - b;
- }
- }else if(order==3){
- int a = smp[order-1] - smp[order-2];
- int c = smp[order-1] - 2*smp[order-2] + smp[order-3];
- for(i=order; i<n; i+=2) {
- int b = smp[i] - smp[i-1];
- int d = b - a;
- res[i]= d - c;
- a = smp[i+1] - smp[i];
- c = a - b;
- res[i+1]= c - d;
- }
- }else{
- int a = smp[order-1] - smp[order-2];
- int c = smp[order-1] - 2*smp[order-2] + smp[order-3];
- int e = smp[order-1] - 3*smp[order-2] + 3*smp[order-3] - smp[order-4];
- for(i=order; i<n; i+=2) {
- int b = smp[i] - smp[i-1];
- int d = b - a;
- int f = d - c;
- res[i]= f - e;
- a = smp[i+1] - smp[i];
- c = a - b;
- e = c - d;
- res[i+1]= e - f;
- }
- }
-}
-
-#define LPC1(x) {\
- int c = coefs[(x)-1];\
- p0 += c*s;\
- s = smp[i-(x)+1];\
- p1 += c*s;\
-}
-
-static av_always_inline void encode_residual_lpc_unrolled(
- int32_t *res, const int32_t *smp, int n,
- int order, const int32_t *coefs, int shift, int big)
-{
- int i;
- for(i=order; i<n; i+=2) {
- int s = smp[i-order];
- int p0 = 0, p1 = 0;
- if(big) {
- switch(order) {
- case 32: LPC1(32)
- case 31: LPC1(31)
- case 30: LPC1(30)
- case 29: LPC1(29)
- case 28: LPC1(28)
- case 27: LPC1(27)
- case 26: LPC1(26)
- case 25: LPC1(25)
- case 24: LPC1(24)
- case 23: LPC1(23)
- case 22: LPC1(22)
- case 21: LPC1(21)
- case 20: LPC1(20)
- case 19: LPC1(19)
- case 18: LPC1(18)
- case 17: LPC1(17)
- case 16: LPC1(16)
- case 15: LPC1(15)
- case 14: LPC1(14)
- case 13: LPC1(13)
- case 12: LPC1(12)
- case 11: LPC1(11)
- case 10: LPC1(10)
- case 9: LPC1( 9)
- LPC1( 8)
- LPC1( 7)
- LPC1( 6)
- LPC1( 5)
- LPC1( 4)
- LPC1( 3)
- LPC1( 2)
- LPC1( 1)
- }
- } else {
- switch(order) {
- case 8: LPC1( 8)
- case 7: LPC1( 7)
- case 6: LPC1( 6)
- case 5: LPC1( 5)
- case 4: LPC1( 4)
- case 3: LPC1( 3)
- case 2: LPC1( 2)
- case 1: LPC1( 1)
- }
- }
- res[i ] = smp[i ] - (p0 >> shift);
- res[i+1] = smp[i+1] - (p1 >> shift);
- }
-}
-
-static void encode_residual_lpc(int32_t *res, const int32_t *smp, int n,
- int order, const int32_t *coefs, int shift)
-{
- int i;
- for(i=0; i<order; i++) {
- res[i] = smp[i];
- }
-#ifdef CONFIG_SMALL
- for(i=order; i<n; i+=2) {
- int j;
- int s = smp[i];
- int p0 = 0, p1 = 0;
- for(j=0; j<order; j++) {
- int c = coefs[j];
- p1 += c*s;
- s = smp[i-j-1];
- p0 += c*s;
- }
- res[i ] = smp[i ] - (p0 >> shift);
- res[i+1] = smp[i+1] - (p1 >> shift);
- }
-#else
- switch(order) {
- case 1: encode_residual_lpc_unrolled(res, smp, n, 1, coefs, shift, 0); break;
- case 2: encode_residual_lpc_unrolled(res, smp, n, 2, coefs, shift, 0); break;
- case 3: encode_residual_lpc_unrolled(res, smp, n, 3, coefs, shift, 0); break;
- case 4: encode_residual_lpc_unrolled(res, smp, n, 4, coefs, shift, 0); break;
- case 5: encode_residual_lpc_unrolled(res, smp, n, 5, coefs, shift, 0); break;
- case 6: encode_residual_lpc_unrolled(res, smp, n, 6, coefs, shift, 0); break;
- case 7: encode_residual_lpc_unrolled(res, smp, n, 7, coefs, shift, 0); break;
- case 8: encode_residual_lpc_unrolled(res, smp, n, 8, coefs, shift, 0); break;
- default: encode_residual_lpc_unrolled(res, smp, n, order, coefs, shift, 1); break;
- }
-#endif
-}
-
-static int encode_residual(FlacEncodeContext *ctx, int ch)
-{
- int i, n;
- int min_order, max_order, opt_order, precision, omethod;
- int min_porder, max_porder;
- FlacFrame *frame;
- FlacSubframe *sub;
- int32_t coefs[MAX_LPC_ORDER][MAX_LPC_ORDER];
- int shift[MAX_LPC_ORDER];
- int32_t *res, *smp;
-
- frame = &ctx->frame;
- sub = &frame->subframes[ch];
- res = sub->residual;
- smp = sub->samples;
- n = frame->blocksize;
-
- /* CONSTANT */
- for(i=1; i<n; i++) {
- if(smp[i] != smp[0]) break;
- }
- if(i == n) {
- sub->type = sub->type_code = FLAC_SUBFRAME_CONSTANT;
- res[0] = smp[0];
- return sub->obits;
- }
-
- /* VERBATIM */
- if(n < 5) {
- sub->type = sub->type_code = FLAC_SUBFRAME_VERBATIM;
- encode_residual_verbatim(res, smp, n);
- return sub->obits * n;
- }
-
- min_order = ctx->options.min_prediction_order;
- max_order = ctx->options.max_prediction_order;
- min_porder = ctx->options.min_partition_order;
- max_porder = ctx->options.max_partition_order;
- precision = ctx->options.lpc_coeff_precision;
- omethod = ctx->options.prediction_order_method;
-
- /* FIXED */
- if(!ctx->options.use_lpc || max_order == 0 || (n <= max_order)) {
- uint32_t bits[MAX_FIXED_ORDER+1];
- if(max_order > MAX_FIXED_ORDER) max_order = MAX_FIXED_ORDER;
- opt_order = 0;
- bits[0] = UINT32_MAX;
- for(i=min_order; i<=max_order; i++) {
- encode_residual_fixed(res, smp, n, i);
- bits[i] = calc_rice_params_fixed(&sub->rc, min_porder, max_porder, res,
- n, i, sub->obits);
- if(bits[i] < bits[opt_order]) {
- opt_order = i;
- }
- }
- sub->order = opt_order;
- sub->type = FLAC_SUBFRAME_FIXED;
- sub->type_code = sub->type | sub->order;
- if(sub->order != max_order) {
- encode_residual_fixed(res, smp, n, sub->order);
- return calc_rice_params_fixed(&sub->rc, min_porder, max_porder, res, n,
- sub->order, sub->obits);
- }
- return bits[sub->order];
- }
-
- /* LPC */
- opt_order = lpc_calc_coefs(&ctx->dsp, smp, n, max_order, precision, coefs,
- shift, ctx->options.use_lpc, omethod, MAX_LPC_SHIFT, 0);
-
- if(omethod == ORDER_METHOD_2LEVEL ||
- omethod == ORDER_METHOD_4LEVEL ||
- omethod == ORDER_METHOD_8LEVEL) {
- int levels = 1 << omethod;
- uint32_t bits[levels];
- int order;
- int opt_index = levels-1;
- opt_order = max_order-1;
- bits[opt_index] = UINT32_MAX;
- for(i=levels-1; i>=0; i--) {
- order = min_order + (((max_order-min_order+1) * (i+1)) / levels)-1;
- if(order < 0) order = 0;
- encode_residual_lpc(res, smp, n, order+1, coefs[order], shift[order]);
- bits[i] = calc_rice_params_lpc(&sub->rc, min_porder, max_porder,
- res, n, order+1, sub->obits, precision);
- if(bits[i] < bits[opt_index]) {
- opt_index = i;
- opt_order = order;
- }
- }
- opt_order++;
- } else if(omethod == ORDER_METHOD_SEARCH) {
- // brute-force optimal order search
- uint32_t bits[MAX_LPC_ORDER];
- opt_order = 0;
- bits[0] = UINT32_MAX;
- for(i=min_order-1; i<max_order; i++) {
- encode_residual_lpc(res, smp, n, i+1, coefs[i], shift[i]);
- bits[i] = calc_rice_params_lpc(&sub->rc, min_porder, max_porder,
- res, n, i+1, sub->obits, precision);
- if(bits[i] < bits[opt_order]) {
- opt_order = i;
- }
- }
- opt_order++;
- } else if(omethod == ORDER_METHOD_LOG) {
- uint32_t bits[MAX_LPC_ORDER];
- int step;
-
- opt_order= min_order - 1 + (max_order-min_order)/3;
- memset(bits, -1, sizeof(bits));
-
- for(step=16 ;step; step>>=1){
- int last= opt_order;
- for(i=last-step; i<=last+step; i+= step){
- if(i<min_order-1 || i>=max_order || bits[i] < UINT32_MAX)
- continue;
- encode_residual_lpc(res, smp, n, i+1, coefs[i], shift[i]);
- bits[i] = calc_rice_params_lpc(&sub->rc, min_porder, max_porder,
- res, n, i+1, sub->obits, precision);
- if(bits[i] < bits[opt_order])
- opt_order= i;
- }
- }
- opt_order++;
- }
-
- sub->order = opt_order;
- sub->type = FLAC_SUBFRAME_LPC;
- sub->type_code = sub->type | (sub->order-1);
- sub->shift = shift[sub->order-1];
- for(i=0; i<sub->order; i++) {
- sub->coefs[i] = coefs[sub->order-1][i];
- }
- encode_residual_lpc(res, smp, n, sub->order, sub->coefs, sub->shift);
- return calc_rice_params_lpc(&sub->rc, min_porder, max_porder, res, n, sub->order,
- sub->obits, precision);
-}
-
-static int encode_residual_v(FlacEncodeContext *ctx, int ch)
-{
- int i, n;
- FlacFrame *frame;
- FlacSubframe *sub;
- int32_t *res, *smp;
-
- frame = &ctx->frame;
- sub = &frame->subframes[ch];
- res = sub->residual;
- smp = sub->samples;
- n = frame->blocksize;
-
- /* CONSTANT */
- for(i=1; i<n; i++) {
- if(smp[i] != smp[0]) break;
- }
- if(i == n) {
- sub->type = sub->type_code = FLAC_SUBFRAME_CONSTANT;
- res[0] = smp[0];
- return sub->obits;
- }
-
- /* VERBATIM */
- sub->type = sub->type_code = FLAC_SUBFRAME_VERBATIM;
- encode_residual_verbatim(res, smp, n);
- return sub->obits * n;
-}
-
-static int estimate_stereo_mode(int32_t *left_ch, int32_t *right_ch, int n)
-{
- int i, best;
- int32_t lt, rt;
- uint64_t sum[4];
- uint64_t score[4];
- int k;
-
- /* calculate sum of 2nd order residual for each channel */
- sum[0] = sum[1] = sum[2] = sum[3] = 0;
- for(i=2; i<n; i++) {
- lt = left_ch[i] - 2*left_ch[i-1] + left_ch[i-2];
- rt = right_ch[i] - 2*right_ch[i-1] + right_ch[i-2];
- sum[2] += FFABS((lt + rt) >> 1);
- sum[3] += FFABS(lt - rt);
- sum[0] += FFABS(lt);
- sum[1] += FFABS(rt);
- }
- /* estimate bit counts */
- for(i=0; i<4; i++) {
- k = find_optimal_param(2*sum[i], n);
- sum[i] = rice_encode_count(2*sum[i], n, k);
- }
-
- /* calculate score for each mode */
- score[0] = sum[0] + sum[1];
- score[1] = sum[0] + sum[3];
- score[2] = sum[1] + sum[3];
- score[3] = sum[2] + sum[3];
-
- /* return mode with lowest score */
- best = 0;
- for(i=1; i<4; i++) {
- if(score[i] < score[best]) {
- best = i;
- }
- }
- if(best == 0) {
- return FLAC_CHMODE_LEFT_RIGHT;
- } else if(best == 1) {
- return FLAC_CHMODE_LEFT_SIDE;
- } else if(best == 2) {
- return FLAC_CHMODE_RIGHT_SIDE;
- } else {
- return FLAC_CHMODE_MID_SIDE;
- }
-}
-
-/**
- * Perform stereo channel decorrelation
- */
-static void channel_decorrelation(FlacEncodeContext *ctx)
-{
- FlacFrame *frame;
- int32_t *left, *right;
- int i, n;
-
- frame = &ctx->frame;
- n = frame->blocksize;
- left = frame->subframes[0].samples;
- right = frame->subframes[1].samples;
-
- if(ctx->channels != 2) {
- frame->ch_mode = FLAC_CHMODE_NOT_STEREO;
- return;
- }
-
- frame->ch_mode = estimate_stereo_mode(left, right, n);
-
- /* perform decorrelation and adjust bits-per-sample */
- if(frame->ch_mode == FLAC_CHMODE_LEFT_RIGHT) {
- return;
- }
- if(frame->ch_mode == FLAC_CHMODE_MID_SIDE) {
- int32_t tmp;
- for(i=0; i<n; i++) {
- tmp = left[i];
- left[i] = (tmp + right[i]) >> 1;
- right[i] = tmp - right[i];
- }
- frame->subframes[1].obits++;
- } else if(frame->ch_mode == FLAC_CHMODE_LEFT_SIDE) {
- for(i=0; i<n; i++) {
- right[i] = left[i] - right[i];
- }
- frame->subframes[1].obits++;
- } else {
- for(i=0; i<n; i++) {
- left[i] -= right[i];
- }
- frame->subframes[0].obits++;
- }
-}
-
-static void write_utf8(PutBitContext *pb, uint32_t val)
-{
- uint8_t tmp;
- PUT_UTF8(val, tmp, put_bits(pb, 8, tmp);)
-}
-
-static void output_frame_header(FlacEncodeContext *s)
-{
- FlacFrame *frame;
- int crc;
-
- frame = &s->frame;
-
- put_bits(&s->pb, 16, 0xFFF8);
- put_bits(&s->pb, 4, frame->bs_code[0]);
- put_bits(&s->pb, 4, s->sr_code[0]);
- if(frame->ch_mode == FLAC_CHMODE_NOT_STEREO) {
- put_bits(&s->pb, 4, s->ch_code);
- } else {
- put_bits(&s->pb, 4, frame->ch_mode);
- }
- put_bits(&s->pb, 3, 4); /* bits-per-sample code */
- put_bits(&s->pb, 1, 0);
- write_utf8(&s->pb, s->frame_count);
- if(frame->bs_code[0] == 6) {
- put_bits(&s->pb, 8, frame->bs_code[1]);
- } else if(frame->bs_code[0] == 7) {
- put_bits(&s->pb, 16, frame->bs_code[1]);
- }
- if(s->sr_code[0] == 12) {
- put_bits(&s->pb, 8, s->sr_code[1]);
- } else if(s->sr_code[0] > 12) {
- put_bits(&s->pb, 16, s->sr_code[1]);
- }
- flush_put_bits(&s->pb);
- crc = av_crc(av_crc_get_table(AV_CRC_8_ATM), 0,
- s->pb.buf, put_bits_count(&s->pb)>>3);
- put_bits(&s->pb, 8, crc);
-}
-
-static void output_subframe_constant(FlacEncodeContext *s, int ch)
-{
- FlacSubframe *sub;
- int32_t res;
-
- sub = &s->frame.subframes[ch];
- res = sub->residual[0];
- put_sbits(&s->pb, sub->obits, res);
-}
-
-static void output_subframe_verbatim(FlacEncodeContext *s, int ch)
-{
- int i;
- FlacFrame *frame;
- FlacSubframe *sub;
- int32_t res;
-
- frame = &s->frame;
- sub = &frame->subframes[ch];
-
- for(i=0; i<frame->blocksize; i++) {
- res = sub->residual[i];
- put_sbits(&s->pb, sub->obits, res);
- }
-}
-
-static void output_residual(FlacEncodeContext *ctx, int ch)
-{
- int i, j, p, n, parts;
- int k, porder, psize, res_cnt;
- FlacFrame *frame;
- FlacSubframe *sub;
- int32_t *res;
-
- frame = &ctx->frame;
- sub = &frame->subframes[ch];
- res = sub->residual;
- n = frame->blocksize;
-
- /* rice-encoded block */
- put_bits(&ctx->pb, 2, 0);
-
- /* partition order */
- porder = sub->rc.porder;
- psize = n >> porder;
- parts = (1 << porder);
- put_bits(&ctx->pb, 4, porder);
- res_cnt = psize - sub->order;
-
- /* residual */
- j = sub->order;
- for(p=0; p<parts; p++) {
- k = sub->rc.params[p];
- put_bits(&ctx->pb, 4, k);
- if(p == 1) res_cnt = psize;
- for(i=0; i<res_cnt && j<n; i++, j++) {
- set_sr_golomb_flac(&ctx->pb, res[j], k, INT32_MAX, 0);
- }
- }
-}
-
-static void output_subframe_fixed(FlacEncodeContext *ctx, int ch)
-{
- int i;
- FlacFrame *frame;
- FlacSubframe *sub;
-
- frame = &ctx->frame;
- sub = &frame->subframes[ch];
-
- /* warm-up samples */
- for(i=0; i<sub->order; i++) {
- put_sbits(&ctx->pb, sub->obits, sub->residual[i]);
- }
-
- /* residual */
- output_residual(ctx, ch);
-}
-
-static void output_subframe_lpc(FlacEncodeContext *ctx, int ch)
-{
- int i, cbits;
- FlacFrame *frame;
- FlacSubframe *sub;
-
- frame = &ctx->frame;
- sub = &frame->subframes[ch];
-
- /* warm-up samples */
- for(i=0; i<sub->order; i++) {
- put_sbits(&ctx->pb, sub->obits, sub->residual[i]);
- }
-
- /* LPC coefficients */
- cbits = ctx->options.lpc_coeff_precision;
- put_bits(&ctx->pb, 4, cbits-1);
- put_sbits(&ctx->pb, 5, sub->shift);
- for(i=0; i<sub->order; i++) {
- put_sbits(&ctx->pb, cbits, sub->coefs[i]);
- }
-
- /* residual */
- output_residual(ctx, ch);
-}
-
-static void output_subframes(FlacEncodeContext *s)
-{
- FlacFrame *frame;
- FlacSubframe *sub;
- int ch;
-
- frame = &s->frame;
-
- for(ch=0; ch<s->channels; ch++) {
- sub = &frame->subframes[ch];
-
- /* subframe header */
- put_bits(&s->pb, 1, 0);
- put_bits(&s->pb, 6, sub->type_code);
- put_bits(&s->pb, 1, 0); /* no wasted bits */
-
- /* subframe */
- if(sub->type == FLAC_SUBFRAME_CONSTANT) {
- output_subframe_constant(s, ch);
- } else if(sub->type == FLAC_SUBFRAME_VERBATIM) {
- output_subframe_verbatim(s, ch);
- } else if(sub->type == FLAC_SUBFRAME_FIXED) {
- output_subframe_fixed(s, ch);
- } else if(sub->type == FLAC_SUBFRAME_LPC) {
- output_subframe_lpc(s, ch);
- }
- }
-}
-
-static void output_frame_footer(FlacEncodeContext *s)
-{
- int crc;
- flush_put_bits(&s->pb);
- crc = bswap_16(av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0,
- s->pb.buf, put_bits_count(&s->pb)>>3));
- put_bits(&s->pb, 16, crc);
- flush_put_bits(&s->pb);
-}
-
-static int flac_encode_frame(AVCodecContext *avctx, uint8_t *frame,
- int buf_size, void *data)
-{
- int ch;
- FlacEncodeContext *s;
- int16_t *samples = data;
- int out_bytes;
-
- s = avctx->priv_data;
-
- init_frame(s);
-
- copy_samples(s, samples);
-
- channel_decorrelation(s);
-
- for(ch=0; ch<s->channels; ch++) {
- encode_residual(s, ch);
- }
- init_put_bits(&s->pb, frame, buf_size);
- output_frame_header(s);
- output_subframes(s);
- output_frame_footer(s);
- out_bytes = put_bits_count(&s->pb) >> 3;
-
- if(out_bytes > s->max_framesize || out_bytes >= buf_size) {
- /* frame too large. use verbatim mode */
- for(ch=0; ch<s->channels; ch++) {
- encode_residual_v(s, ch);
- }
- init_put_bits(&s->pb, frame, buf_size);
- output_frame_header(s);
- output_subframes(s);
- output_frame_footer(s);
- out_bytes = put_bits_count(&s->pb) >> 3;
-
- if(out_bytes > s->max_framesize || out_bytes >= buf_size) {
- /* still too large. must be an error. */
- av_log(avctx, AV_LOG_ERROR, "error encoding frame\n");
- return -1;
- }
- }
-
- s->frame_count++;
- return out_bytes;
-}
-
-static av_cold int flac_encode_close(AVCodecContext *avctx)
-{
- av_freep(&avctx->extradata);
- avctx->extradata_size = 0;
- av_freep(&avctx->coded_frame);
- return 0;
-}
+ int *shift, int use_lpc, int omethod, int max_shift, int zero_shift);
-AVCodec flac_encoder = {
- "flac",
- CODEC_TYPE_AUDIO,
- CODEC_ID_FLAC,
- sizeof(FlacEncodeContext),
- flac_encode_init,
- flac_encode_frame,
- flac_encode_close,
- NULL,
- .capabilities = CODEC_CAP_SMALL_LAST_FRAME,
- .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
- .long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
-};
+#endif /* FFMPEG_LPC_H */
More information about the ffmpeg-cvslog
mailing list