[Ffmpeg-devel] [Patch] DVB Subtitle decoder
Ian Caulfield
imc25
Sat Jul 9 01:00:02 CEST 2005
On Fri, 8 Jul 2005, Ian Caulfield wrote:
> On Fri, 8 Jul 2005, Nico Sabbi wrote:
>
>> Ian Caulfield wrote:
>>
>>> Hi,
>>>
>>> The attached patch adds a DVB subtitle decoder. I've had to fiddle the
>>> AVSubtitle struct to get it to work efficiently; the patch includes
>>> tweaks to the existing subtitle code. I've also fiddled slightly with
>>> the mpegts parser to allow it to detect DVB subtitles.
>>>
>>> Issues still outstanding:
>>> - The 'end_display_time' is currently inaccurate - it gives the page
>>> timeout rather than the time it is replaced by the next subtitle
>>> - The parser is a bit of a hack to reassemble PES packets. I welcome
>>> suggestions of better ways to implement it
>>> - If there are multiple subtitle streams on one PID, only one will be
>>> decoded. To fix this it is necessary to associate more than one
>>> AVStream with a pid - not sure how to do this.
>>>
>>> Please let me know if you have any comments/suggestions.
>>>
>> Can you upload a sample to www.mplayerhq.hu/MPlayer/incoming please?
>
> By sample, do you mean the patch files or a sample file it can decode?
Never mind, uploading sample dvbsubtest.ts now.
Also, have spotted a typo in the code (don't edit code that's #ifdef'ed
out!) - new source file reattached.
Ian
-------------- next part --------------
/*
* DVD subtitle decoding for ffmpeg
* Copyright (c) 2005 Ian Caulfield.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "avcodec.h"
//#define DEBUG
//#define DEBUG_PACKET_CONTENTS
//#define DEBUG_SAVE_IMAGES
#define DVBSUB_PAGE_SEGMENT 0x10
#define DVBSUB_REGION_SEGMENT 0x11
#define DVBSUB_CLUT_SEGMENT 0x12
#define DVBSUB_OBJECT_SEGMENT 0x13
#define DVBSUB_DISPLAY_SEGMENT 0x80
static uint16_t getbe16(const uint8_t *p)
{
return (p[0] << 8) | p[1];
}
#define MAX_NEG_CROP 1024
static unsigned char cropTbl[256 + 2 * MAX_NEG_CROP];
static unsigned char *cm;
#ifdef DEBUG_SAVE_IMAGES
#undef fprintf
#if 0
static void png_save(const char *filename, uint8_t *bitmap, int w, int h,
uint32_t *rgba_palette)
{
int x, y, v;
FILE *f;
char fname[40], fname2[40];
char command[1024];
snprintf(fname, 40, "%s.ppm", filename);
f = fopen(fname, "w");
if (!f) {
perror(fname);
exit(1);
}
fprintf(f, "P6\n"
"%d %d\n"
"%d\n",
w, h, 255);
for(y = 0; y < h; y++) {
for(x = 0; x < w; x++) {
v = rgba_palette[bitmap[y * w + x]];
putc((v >> 16) & 0xff, f);
putc((v >> 8) & 0xff, f);
putc((v >> 0) & 0xff, f);
}
}
fclose(f);
snprintf(fname2, 40, "%s-a.pgm", filename);
f = fopen(fname2, "w");
if (!f) {
perror(fname2);
exit(1);
}
fprintf(f, "P5\n"
"%d %d\n"
"%d\n",
w, h, 255);
for(y = 0; y < h; y++) {
for(x = 0; x < w; x++) {
v = rgba_palette[bitmap[y * w + x]];
putc((v >> 24) & 0xff, f);
}
}
fclose(f);
snprintf(command, 1024, "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
system(command);
snprintf(command, 1024, "rm %s %s", fname, fname2);
system(command);
}
#endif
static void png_save2(const char *filename, uint32_t *bitmap, int w, int h)
{
int x, y, v;
FILE *f;
char fname[40], fname2[40];
char command[1024];
snprintf(fname, 40, "%s.ppm", filename);
f = fopen(fname, "w");
if (!f) {
perror(fname);
exit(1);
}
fprintf(f, "P6\n"
"%d %d\n"
"%d\n",
w, h, 255);
for(y = 0; y < h; y++) {
for(x = 0; x < w; x++) {
v = bitmap[y * w + x];
putc((v >> 16) & 0xff, f);
putc((v >> 8) & 0xff, f);
putc((v >> 0) & 0xff, f);
}
}
fclose(f);
snprintf(fname2, 40, "%s-a.pgm", filename);
f = fopen(fname2, "w");
if (!f) {
perror(fname2);
exit(1);
}
fprintf(f, "P5\n"
"%d %d\n"
"%d\n",
w, h, 255);
for(y = 0; y < h; y++) {
for(x = 0; x < w; x++) {
v = bitmap[y * w + x];
putc((v >> 24) & 0xff, f);
}
}
fclose(f);
snprintf(command, 1024, "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
system(command);
snprintf(command, 1024, "rm %s %s", fname, fname2);
system(command);
}
#endif
#define RGBA(r,g,b,a) (((a) << 24) | ((r) << 16) | ((g) << 8) | (b))
typedef struct DVBSubCLUT {
uint32_t clut4[4];
uint32_t clut16[16];
uint32_t clut256[256];
} DVBSubCLUT;
static DVBSubCLUT default_clut;
typedef struct DVBSubObjectDisplay {
int object_id;
int region_id;
int x_pos;
int y_pos;
int fgcolour;
int bgcolour;
struct DVBSubObjectDisplay *region_list_next;
struct DVBSubObjectDisplay *object_list_next;
} DVBSubObjectDisplay;
typedef struct DVBSubObject {
int id;
int type;
int tmp_width;
int tmp_height;
int tmp_clut;
struct DVBSubObjectDisplay *display_list;
struct DVBSubObject *next;
} DVBSubObject;
typedef struct DVBSubRegionDisplay {
int region_id;
int x_pos;
int y_pos;
struct DVBSubRegionDisplay *next;
} DVBSubRegionDisplay;
typedef struct DVBSubRegion {
int width;
int height;
int depth;
int clut;
int bgcolour;
uint8_t *pbuf;
int buf_size;
struct DVBSubObjectDisplay *display_list;
} DVBSubRegion;
typedef struct DVBSubContext {
int composition_id;
int ancillary_id;
int time_out;
DVBSubRegion *region[256];
DVBSubCLUT *clut[256];
DVBSubObject *object;
int display_list_size;
DVBSubRegionDisplay *display_list;
} DVBSubContext;
static DVBSubObject* get_object(DVBSubObject *first, int object_id)
{
DVBSubObject *ptr = first;
while (ptr != NULL) {
ptr = ptr->next;
}
ptr = first;
while (ptr != NULL && ptr->id != object_id) {
ptr = ptr->next;
}
if (ptr != NULL && ptr->id == object_id)
return ptr;
return NULL;
}
static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
{
DVBSubObject *object, *obj2, **obj2_ptr;
DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
while (region->display_list != NULL) {
display = region->display_list;
object = get_object(ctx->object, display->object_id);
if (object != NULL) {
obj_disp = object->display_list;
obj_disp_ptr = &object->display_list;
while (obj_disp != NULL && obj_disp != display) {
obj_disp_ptr = &obj_disp->object_list_next;
obj_disp = obj_disp->object_list_next;
}
if (obj_disp) {
*obj_disp_ptr = obj_disp->object_list_next;
if (object->display_list == NULL) {
obj2 = ctx->object;
obj2_ptr = &ctx->object;
while (obj2 != NULL && obj2 != object) {
obj2_ptr = &obj2->next;
obj2 = obj2->next;
}
if (obj2 != object)
abort();
*obj2_ptr = obj2->next;
av_free(obj2);
}
}
}
region->display_list = display->region_list_next;
av_free(display);
}
}
static int dvbsub_init_decoder(AVCodecContext *avctx)
{
int i, r, g, b, a = 0;
DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
for (i = 0; i < 256; i++)
cropTbl[i + MAX_NEG_CROP] = i;
for (i = 0; i < MAX_NEG_CROP; i++)
{
cropTbl[i] = 0;
cropTbl[i + MAX_NEG_CROP + 256] = 255;
}
cm = cropTbl + MAX_NEG_CROP;
memset(avctx->priv_data, 0, sizeof(DVBSubContext));
ctx->composition_id = avctx->sub_id & 0xffff;
ctx->ancillary_id = avctx->sub_id >> 16;
default_clut.clut4[0] = RGBA( 0, 0, 0, 0);
default_clut.clut4[1] = RGBA(255, 255, 255, 255);
default_clut.clut4[2] = RGBA( 0, 0, 0, 255);
default_clut.clut4[3] = RGBA(127, 127, 127, 255);
default_clut.clut16[0] = RGBA( 0, 0, 0, 0);
for (i = 1; i < 16; i++) {
if (i < 8) {
r = (i & 1) ? 255 : 0;
g = (i & 2) ? 255 : 0;
b = (i & 4) ? 255 : 0;
} else {
r = (i & 1) ? 127 : 0;
g = (i & 2) ? 127 : 0;
b = (i & 4) ? 127 : 0;
}
default_clut.clut16[i] = RGBA(r, g, b, 255);
}
default_clut.clut256[0] = RGBA( 0, 0, 0, 0);
for (i = 1; i < 256; i++) {
if (i < 8) {
r = (i & 1) ? 255 : 0;
g = (i & 2) ? 255 : 0;
b = (i & 4) ? 255 : 0;
a = 63;
} else {
switch (i & 0x88) {
case 0x00:
r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
a = 255;
break;
case 0x08:
r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
a = 127;
break;
case 0x80:
r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
a = 255;
break;
case 0x88:
r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
a = 255;
break;
}
}
default_clut.clut256[i] = RGBA(r, g, b, a);
}
return 0;
}
static int dvbsub_close_decoder(AVCodecContext *avctx)
{
return 0;
}
static int get_bits(int num, uint8_t **srcbuf, uint8_t *sbuf_end, int *bit_pos)
{
int return_val = 0;
if (*bit_pos > 7)
*bit_pos &= 7;
while (num > (8 - *bit_pos))
{
num -= (8 - *bit_pos);
return_val |= ((**srcbuf) & ((1 << *bit_pos) - 1)) << num;
*bit_pos = 0;
(*srcbuf)++;
}
return_val |= ((**srcbuf) >> (8 - (*bit_pos + num))) & ((1 << num) - 1);
*bit_pos += num;
if (*bit_pos > 7) {
*bit_pos &= 7;
(*srcbuf)++;
}
return return_val;
}
static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len,
uint8_t **srcbuf, uint8_t *sbuf_end,
int non_mod, uint8_t *map_table)
{
int bit_pos = 0;
int bits;
int run_length;
int pixels_read = 0;
while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
bits = get_bits(2, srcbuf, sbuf_end, &bit_pos);
if (bits != 0) {
if (non_mod != 1 || bits != 1) {
if (map_table != NULL)
*destbuf++ = map_table[bits];
else
*destbuf++ = bits;
}
pixels_read++;
} else {
bits = get_bits(1, srcbuf, sbuf_end, &bit_pos);
if (bits == 1) {
run_length = get_bits(3, srcbuf, sbuf_end, &bit_pos) + 3;
bits = get_bits(2, srcbuf, sbuf_end, &bit_pos);
if (non_mod == 1 && bits == 1)
pixels_read += run_length;
else {
if (map_table != NULL)
bits = map_table[bits];
while (run_length-- > 0 && pixels_read < dbuf_len) {
*destbuf++ = bits;
pixels_read++;
}
}
} else {
bits = get_bits(1, srcbuf, sbuf_end, &bit_pos);
if (bits == 0) {
bits = get_bits(2, srcbuf, sbuf_end, &bit_pos);
if (bits == 2) {
run_length = get_bits(4, srcbuf, sbuf_end, &bit_pos) + 12;
bits = get_bits(2, srcbuf, sbuf_end, &bit_pos);
if (non_mod == 1 && bits == 1)
pixels_read += run_length;
else {
if (map_table != NULL)
bits = map_table[bits];
while (run_length-- > 0 && pixels_read < dbuf_len) {
*destbuf++ = bits;
pixels_read++;
}
}
} else if (bits == 3) {
run_length = get_bits(8, srcbuf, sbuf_end, &bit_pos) + 29;
bits = get_bits(2, srcbuf, sbuf_end, &bit_pos);
if (non_mod == 1 && bits == 1)
pixels_read += run_length;
else {
if (map_table != NULL)
bits = map_table[bits];
while (run_length-- > 0 && pixels_read < dbuf_len) {
*destbuf++ = bits;
pixels_read++;
}
}
} else if (bits == 1) {
pixels_read += 2;
if (map_table != NULL)
bits = map_table[0];
else
bits = 0;
if (pixels_read <= dbuf_len) {
*destbuf++ = bits;
*destbuf++ = bits;
}
} else {
if (bit_pos != 0)
(*srcbuf)++;
return pixels_read;
}
} else {
if (map_table != NULL)
bits = map_table[0];
else
bits = 0;
*destbuf++ = bits;
pixels_read++;
}
}
}
}
if (get_bits(6, srcbuf, sbuf_end, &bit_pos) != 0)
av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
if (bit_pos != 0)
(*srcbuf)++;
return pixels_read;
}
static int dvbsub_read_4bit_string(uint8_t *destbuf, int dbuf_len,
uint8_t **srcbuf, uint8_t *sbuf_end,
int non_mod, uint8_t *map_table)
{
int bit_pos = 0;
int bits;
int run_length;
int pixels_read = 0;
while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
bits = get_bits(4, srcbuf, sbuf_end, &bit_pos);
if (bits != 0) {
if (non_mod != 1 || bits != 1) {
if (map_table != NULL)
*destbuf++ = map_table[bits];
else
*destbuf++ = bits;
}
pixels_read++;
} else {
bits = get_bits(1, srcbuf, sbuf_end, &bit_pos);
if (bits == 0) {
run_length = get_bits(3, srcbuf, sbuf_end, &bit_pos);
if (run_length == 0) {
if (bit_pos != 0)
(*srcbuf)++;
return pixels_read;
}
run_length += 2;
if (map_table != NULL)
bits = map_table[0];
else
bits = 0;
while (run_length-- > 0 && pixels_read < dbuf_len) {
*destbuf++ = bits;
pixels_read++;
}
} else {
bits = get_bits(1, srcbuf, sbuf_end, &bit_pos);
if (bits == 0) {
run_length = get_bits(2, srcbuf, sbuf_end, &bit_pos) + 4;
bits = get_bits(4, srcbuf, sbuf_end, &bit_pos);
if (non_mod == 1 && bits == 1)
pixels_read += run_length;
else {
if (map_table != NULL)
bits = map_table[bits];
while (run_length-- > 0 && pixels_read < dbuf_len) {
*destbuf++ = bits;
pixels_read++;
}
}
} else {
bits = get_bits(2, srcbuf, sbuf_end, &bit_pos);
if (bits == 2) {
run_length = get_bits(4, srcbuf, sbuf_end, &bit_pos) + 9;
bits = get_bits(4, srcbuf, sbuf_end, &bit_pos);
if (non_mod == 1 && bits == 1)
pixels_read += run_length;
else {
if (map_table != NULL)
bits = map_table[bits];
while (run_length-- > 0 && pixels_read < dbuf_len) {
*destbuf++ = bits;
pixels_read++;
}
}
} else if (bits == 3) {
run_length = get_bits(8, srcbuf, sbuf_end, &bit_pos) + 25;
bits = get_bits(4, srcbuf, sbuf_end, &bit_pos);
if (non_mod == 1 && bits == 1)
pixels_read += run_length;
else {
if (map_table != NULL)
bits = map_table[bits];
while (run_length-- > 0 && pixels_read < dbuf_len) {
*destbuf++ = bits;
pixels_read++;
}
}
} else if (bits == 1) {
pixels_read += 2;
if (map_table != NULL)
bits = map_table[0];
else
bits = 0;
if (pixels_read <= dbuf_len) {
*destbuf++ = bits;
*destbuf++ = bits;
}
} else {
if (map_table != NULL)
bits = map_table[0];
else
bits = 0;
*destbuf++ = bits;
pixels_read ++;
}
}
}
}
}
if (get_bits(8, srcbuf, sbuf_end, &bit_pos) != 0)
av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
if (bit_pos != 0)
(*srcbuf)++;
return pixels_read;
}
static int dvbsub_read_8bit_string(uint8_t *destbuf, int dbuf_len,
uint8_t **srcbuf, uint8_t *sbuf_end,
int non_mod, uint8_t *map_table)
{
int bits;
int run_length;
int pixels_read = 0;
while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
bits = *(*srcbuf)++;
if (bits != 0) {
if (non_mod != 1 || bits != 1) {
if (map_table != NULL)
*destbuf++ = map_table[bits];
else
*destbuf++ = bits;
}
pixels_read++;
} else {
bits = *(*srcbuf)++;
run_length = bits & 0x7f;
if ((bits & 0x80) == 0) {
if (run_length == 0) {
return pixels_read;
}
if (map_table != NULL)
bits = map_table[0];
else
bits = 0;
while (run_length-- > 0 && pixels_read < dbuf_len) {
*destbuf++ = bits;
pixels_read++;
}
} else {
bits = *(*srcbuf)++;
if (non_mod == 1 && bits == 1)
pixels_read += run_length;
if (map_table != NULL)
bits = map_table[bits];
else while (run_length-- > 0 && pixels_read < dbuf_len) {
*destbuf++ = bits;
pixels_read++;
}
}
}
}
if (*(*srcbuf)++ != 0)
av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
return pixels_read;
}
static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
uint8_t *buf, int buf_size, int top_bottom, int non_mod)
{
DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
DVBSubRegion *region = ctx->region[display->region_id];
uint8_t *buf_end = buf + buf_size;
uint8_t *pbuf;
int x_pos, y_pos;
int i;
uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
uint8_t *map_table;
#ifdef DEBUG_PACKET_CONTENTS
av_log(avctx, AV_LOG_INFO, "DVB pixel block size %d, %s field:\n", buf_size,
top_bottom ? "bottom" : "top");
for (i = 0; i < buf_size; i++)
{
av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
if (i % 16 == 15)
av_log(avctx, AV_LOG_INFO, "\n");
}
if (i % 16 != 0)
av_log(avctx, AV_LOG_INFO, "\n");
#endif
if (region == 0)
return;
pbuf = region->pbuf;
x_pos = display->x_pos;
y_pos = display->y_pos;
if ((y_pos & 1) != top_bottom)
y_pos++;
while (buf < buf_end) {
if (x_pos > region->width || y_pos > region->height) {
av_log(avctx, AV_LOG_ERROR, "Invalid object location!\n");
return;
}
switch (*buf++) {
case 0x10:
if (region->depth == 8)
map_table = map2to8;
else if (region->depth == 4)
map_table = map2to4;
else
map_table = NULL;
x_pos += dvbsub_read_2bit_string(pbuf + (y_pos * region->width) + x_pos,
region->width - x_pos, &buf, buf_end,
non_mod, map_table);
break;
case 0x11:
if (region->depth < 4) {
av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
return;
}
if (region->depth == 8)
map_table = map4to8;
else
map_table = NULL;
x_pos += dvbsub_read_4bit_string(pbuf + (y_pos * region->width) + x_pos,
region->width - x_pos, &buf, buf_end,
non_mod, map_table);
break;
case 0x12:
if (region->depth < 8) {
av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
return;
}
x_pos += dvbsub_read_8bit_string(pbuf + (y_pos * region->width) + x_pos,
region->width - x_pos, &buf, buf_end,
non_mod, NULL);
break;
case 0x20:
map2to4[0] = (*buf) >> 4;
map2to4[1] = (*buf++) & 0xf;
map2to4[2] = (*buf) >> 4;
map2to4[3] = (*buf++) & 0xf;
break;
case 0x21:
for (i = 0; i < 4; i++)
map2to8[i] = *buf++;
break;
case 0x22:
for (i = 0; i < 16; i++)
map4to8[i] = *buf++;
break;
case 0xf0:
x_pos = display->x_pos;
y_pos += 2;
break;
default:
av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
}
}
}
static void dvbsub_parse_object_segment(AVCodecContext *avctx,
uint8_t *buf, int buf_size)
{
DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
uint8_t *buf_end = buf + buf_size;
uint8_t *block;
int object_id;
DVBSubObject *object;
DVBSubObjectDisplay *display;
int top_field_len, bottom_field_len;
int coding_method, non_modifying_colour;
object_id = getbe16(buf);
buf += 2;
object = get_object(ctx->object, object_id);
if (!object)
return;
coding_method = ((*buf) >> 2) & 3;
non_modifying_colour = ((*buf++) >> 1) & 1;
if (coding_method == 0) {
top_field_len = getbe16(buf);
buf += 2;
bottom_field_len = getbe16(buf);
buf += 2;
if (buf + top_field_len + bottom_field_len > buf_end) {
av_log(avctx, AV_LOG_ERROR, "Field data size too large\n");
return;
}
for (display = object->display_list; display != 0; display = display->object_list_next) {
block = buf;
dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
non_modifying_colour);
if (bottom_field_len > 0)
block = buf + top_field_len;
else
bottom_field_len = top_field_len;
dvbsub_parse_pixel_data_block(avctx, display, block, bottom_field_len, 1,
non_modifying_colour);
}
/* } else if (coding_method == 1) {*/
} else {
av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
}
}
#define SCALEBITS 10
#define ONE_HALF (1 << (SCALEBITS - 1))
#define FIX(x) ((int) ((x) * (1<<SCALEBITS) + 0.5))
#define YUV_TO_RGB1_CCIR(cb1, cr1)\
{\
cb = (cb1) - 128;\
cr = (cr1) - 128;\
r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;\
g_add = - FIX(0.34414*255.0/224.0) * cb - FIX(0.71414*255.0/224.0) * cr + \
ONE_HALF;\
b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;\
}
#define YUV_TO_RGB2_CCIR(r, g, b, y1)\
{\
y = ((y1) - 16) * FIX(255.0/219.0);\
r = cm[(y + r_add) >> SCALEBITS];\
g = cm[(y + g_add) >> SCALEBITS];\
b = cm[(y + b_add) >> SCALEBITS];\
}
static void dvbsub_parse_clut_segment(AVCodecContext *avctx,
uint8_t *buf, int buf_size)
{
DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
uint8_t *buf_end = buf + buf_size;
int clut_id;
DVBSubCLUT *clut;
int entry_id, depth , full_range;
int y, cr, cb, alpha;
int r, g, b, r_add, g_add, b_add;
#ifdef DEBUG_PACKET_CONTENTS
int i;
av_log(avctx, AV_LOG_INFO, "DVB clut packet:\n");
for (i=0; i < buf_size; i++)
{
av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
if (i % 16 == 15)
av_log(avctx, AV_LOG_INFO, "\n");
}
if (i % 16 != 0)
av_log(avctx, AV_LOG_INFO, "\n");
#endif
clut_id = *buf++;
buf += 1;
if (!ctx->clut[clut_id]) {
ctx->clut[clut_id] = av_malloc(sizeof(DVBSubCLUT));
memcpy(ctx->clut[clut_id], &default_clut, sizeof(DVBSubCLUT));
}
clut = ctx->clut[clut_id];
while (buf + 4 < buf_end)
{
entry_id = *buf++;
depth = (*buf) & 0xe0;
if (depth == 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
return;
}
full_range = (*buf++) & 1;
if (full_range) {
y = *buf++;
cr = *buf++;
cb = *buf++;
alpha = *buf++;
} else {
y = buf[0] & 0xfc;
cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
cb = (buf[1] << 2) & 0xf0;
alpha = (buf[1] << 6) & 0xc0;
buf += 2;
}
if (y == 0)
alpha = 0xff;
YUV_TO_RGB1_CCIR(cb, cr);
YUV_TO_RGB2_CCIR(r, g, b, y);
#ifdef DEBUG
av_log(avctx, AV_LOG_INFO, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
#endif
if (depth & 0x80)
clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
if (depth & 0x40)
clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
if (depth & 0x20)
clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
}
}
static void dvbsub_parse_region_segment(AVCodecContext *avctx,
uint8_t *buf, int buf_size)
{
DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
uint8_t *buf_end = buf + buf_size;
int region_id, object_id;
DVBSubRegion *region;
DVBSubObject *object;
DVBSubObjectDisplay *display;
int fill;
if (buf_size < 10)
return;
region_id = *buf++;
if (!ctx->region[region_id])
ctx->region[region_id] = av_mallocz(sizeof(DVBSubRegion));
region = ctx->region[region_id];
fill = ((*buf++) >> 3) & 1;
region->width = getbe16(buf);
buf += 2;
region->height = getbe16(buf);
buf += 2;
if (region->width * region->height != region->buf_size) {
if (region->pbuf != 0)
av_free(region->pbuf);
region->buf_size = region->width * region->height;
region->pbuf = av_malloc(region->buf_size);
fill = 1;
}
region->depth = 1 << (((*buf++) >> 2) & 7);
region->clut = *buf++;
if (region->depth == 8)
region->bgcolour = *buf++;
else {
buf += 1;
if (region->depth == 4)
region->bgcolour = (((*buf++) >> 4) & 15);
else
region->bgcolour = (((*buf++) >> 2) & 3);
}
#ifdef DEBUG
av_log(avctx, AV_LOG_INFO, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
#endif
if (fill) {
memset(region->pbuf, region->bgcolour, region->buf_size);
#ifdef DEBUG
av_log(avctx, AV_LOG_INFO, "Fill region (%d)\n", region->bgcolour);
#endif
}
delete_region_display_list(ctx, region);
while (buf + 5 < buf_end) {
object_id = getbe16(buf);
buf += 2;
object = get_object(ctx->object, object_id);
if (!object) {
object = av_mallocz(sizeof(DVBSubObject));
object->id = object_id;
object->next = ctx->object;
ctx->object = object;
}
object->type = (*buf) >> 6;
display = av_mallocz(sizeof(DVBSubObjectDisplay));
display->object_id = object_id;
display->region_id = region_id;
display->x_pos = getbe16(buf) & 0xfff;
buf += 2;
display->y_pos = getbe16(buf) & 0xfff;
buf += 2;
if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
display->fgcolour = *buf++;
display->bgcolour = *buf++;
}
display->region_list_next = region->display_list;
region->display_list = display;
display->object_list_next = object->display_list;
object->display_list = display;
}
}
static void dvbsub_parse_page_segment(AVCodecContext *avctx,
uint8_t *buf, int buf_size)
{
DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
DVBSubRegionDisplay *display;
DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
uint8_t *buf_end = buf + buf_size;
int region_id;
int page_state;
if (buf_size < 1)
return;
ctx->time_out = *buf++;
page_state = ((*buf++) >> 2) & 3;
#ifdef DEBUG
av_log(avctx, AV_LOG_INFO, "Page time out %ds, state %d\n", ctx->time_out, page_state);
#endif
tmp_display_list = ctx->display_list;
ctx->display_list = NULL;
ctx->display_list_size = 0;
while (buf + 5 < buf_end) {
region_id = *buf++;
buf += 1;
display = tmp_display_list;
tmp_ptr = &tmp_display_list;
while (display != NULL && display->region_id != region_id) {
tmp_ptr = &display->next;
display = display->next;
}
if (display == NULL)
display = av_mallocz(sizeof(DVBSubRegionDisplay));
display->region_id = region_id;
display->x_pos = getbe16(buf);
buf += 2;
display->y_pos = getbe16(buf);
buf += 2;
*tmp_ptr = display->next;
display->next = ctx->display_list;
ctx->display_list = display;
ctx->display_list_size++;
#ifdef DEBUG
av_log(avctx, AV_LOG_INFO, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
#endif
}
while (tmp_display_list != 0) {
display = tmp_display_list;
tmp_display_list = display->next;
av_free(display);
}
}
#ifdef DEBUG_SAVE_IMAGES
static void save_display_set(DVBSubContext *ctx)
{
DVBSubRegion *region;
DVBSubRegionDisplay *display;
DVBSubCLUT *clut;
uint32_t *clut_table;
int x_pos, y_pos, width, height;
int x, y, y_off, x_off;
uint32_t *pbuf;
char filename[32];
static int fileno_index = 0;
x_pos = -1;
y_pos = -1;
width = 0;
height = 0;
for (display = ctx->display_list; display != 0; display = display->next) {
region = ctx->region[display->region_id];
if (x_pos == -1) {
x_pos = display->x_pos;
y_pos = display->y_pos;
width = region->width;
height = region->height;
} else {
if (display->x_pos < x_pos) {
width += (x_pos - display->x_pos);
x_pos = display->x_pos;
}
if (display->y_pos < y_pos) {
height += (y_pos - display->y_pos);
y_pos = display->y_pos;
}
if (display->x_pos + region->width > x_pos + width) {
width = display->x_pos + region->width - x_pos;
}
if (display->y_pos + region->height > y_pos + height) {
height = display->y_pos + region->height - y_pos;
}
}
}
if (x_pos >= 0) {
pbuf = av_malloc(width * height * 4);
for (display = ctx->display_list; display != 0; display = display->next) {
region = ctx->region[display->region_id];
x_off = display->x_pos - x_pos;
y_off = display->y_pos - y_pos;
clut = ctx->clut[region->clut];
if (clut == 0)
clut = &default_clut;
switch (region->depth) {
case 2:
clut_table = clut->clut4;
break;
case 8:
clut_table = clut->clut256;
break;
case 4:
default:
clut_table = clut->clut16;
break;
}
for (y = 0; y < region->height; y++) {
for (x = 0; x < region->width; x++) {
pbuf[((y + y_off) * width) + x_off + x] =
clut_table[region->pbuf[y * region->width + x]];
}
}
}
snprintf(filename, 32, "dvbs.%d", fileno_index);
png_save2(filename, pbuf, width, height);
av_free(pbuf);
}
fileno_index++;
}
#endif
static int dvbsub_display_end_segment(AVCodecContext *avctx, uint8_t *buf,
int buf_size, AVSubtitle *sub)
{
DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
DVBSubRegion *region;
DVBSubRegionDisplay *display;
AVSubtitleRect *rect;
DVBSubCLUT *clut;
uint32_t *clut_table;
int i;
sub->rects = NULL;
sub->start_display_time = 0;
sub->end_display_time = ctx->time_out * 1000;
sub->format = 0;
sub->num_rects = ctx->display_list_size;
if (sub->num_rects == 0)
return 0;
sub->rects = av_mallocz(sizeof(AVSubtitleRect) * sub->num_rects);
i = 0;
for (display = ctx->display_list; display != 0; display = display->next) {
region = ctx->region[display->region_id];
rect = &sub->rects[i];
rect->x = display->x_pos;
rect->y = display->y_pos;
rect->w = region->width;
rect->h = region->height;
rect->nb_colors = 16;
rect->linesize = region->width;
clut = ctx->clut[region->clut];
if (clut == 0)
clut = &default_clut;
switch (region->depth) {
case 2:
clut_table = clut->clut4;
break;
case 8:
clut_table = clut->clut256;
break;
case 4:
default:
clut_table = clut->clut16;
break;
}
rect->rgba_palette = av_malloc((1 << region->depth) * sizeof(uint32_t));
memcpy(rect->rgba_palette, clut_table, (1 << region->depth) * sizeof(uint32_t));
rect->bitmap = av_malloc(region->buf_size);
memcpy(rect->bitmap, region->pbuf, region->buf_size);
i++;
}
#ifdef DEBUG_SAVE_IMAGES
save_display_set(ctx);
#endif
return 1;
}
static int dvbsub_decode(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
{
DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
AVSubtitle *sub = (AVSubtitle*) data;
uint8_t *p, *p_end;
int segment_type;
int page_id;
int segment_length;
#ifdef DEBUG_PACKET_CONTENTS
int i;
av_log(avctx, AV_LOG_INFO, "DVB sub packet:\n");
for (i=0; i < buf_size; i++)
{
av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
if (i % 16 == 15)
av_log(avctx, AV_LOG_INFO, "\n");
}
if (i % 16 != 0)
av_log(avctx, AV_LOG_INFO, "\n");
#endif
if (buf_size <= 2)
return -1;
p = buf;
p_end = buf + buf_size;
if (*p++ != 0x20 || *p++ != 0x00) {
#ifdef DEBUG
av_log(avctx, AV_LOG_INFO, "Bad packet header\n");
#endif
return -1;
}
while (p < p_end && *p == 0x0f)
{
p += 1;
segment_type = *p++;
page_id = getbe16(p);
p += 2;
segment_length = getbe16(p);
p += 2;
if (page_id == ctx->composition_id || page_id == ctx->ancillary_id) {
switch (segment_type) {
case DVBSUB_PAGE_SEGMENT:
dvbsub_parse_page_segment(avctx, p, segment_length);
break;
case DVBSUB_REGION_SEGMENT:
dvbsub_parse_region_segment(avctx, p, segment_length);
break;
case DVBSUB_CLUT_SEGMENT:
dvbsub_parse_clut_segment(avctx, p, segment_length);
break;
case DVBSUB_OBJECT_SEGMENT:
dvbsub_parse_object_segment(avctx, p, segment_length);
break;
case DVBSUB_DISPLAY_SEGMENT:
*data_size = dvbsub_display_end_segment(avctx, p, segment_length, sub);
break;
default:
#ifdef DEBUG
av_log(avctx, AV_LOG_INFO, "Subtitling segment type 0x%x, page id %d, length %d\n",
segment_type, page_id, segment_length);
#endif
break;
}
}
p += segment_length;
}
if (*p++ != 0xff || p != p_end)
{
#ifdef DEBUG
av_log(avctx, AV_LOG_INFO, "Bad packet footer\n");
#endif
return -1;
}
return 0;
}
AVCodec dvbsub_decoder = {
"dvbsub",
CODEC_TYPE_SUBTITLE,
CODEC_ID_DVB_SUBTITLE,
sizeof(DVBSubContext),
dvbsub_init_decoder,
NULL,
dvbsub_close_decoder,
dvbsub_decode,
};
/* Parser (mostly) copied from dvdsub.c */
#define PARSE_BUF_SIZE (65536 + 184)
/* parser definition */
typedef struct DVBSubParseContext {
uint8_t *packet_buf;
int packet_start;
int packet_index;
} DVBSubParseContext;
static int dvbsub_parse_init(AVCodecParserContext *s)
{
DVBSubParseContext *pc = s->priv_data;
pc->packet_buf = av_malloc(PARSE_BUF_SIZE);
return 0;
}
static int dvbsub_parse(AVCodecParserContext *s,
AVCodecContext *avctx,
uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
DVBSubParseContext *pc = s->priv_data;
#ifdef DEBUG2
int i;
av_log(avctx, AV_LOG_INFO, "DVB parse packet pts=%Lx, lpts=%Lx, cpts=%Lx:\n",
s->pts, s->last_pts, s->cur_frame_pts[s->cur_frame_start_index]);
for (i=0; i < buf_size; i++)
{
av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
if (i % 16 == 15)
av_log(avctx, AV_LOG_INFO, "\n");
}
if (i % 16 != 0)
av_log(avctx, AV_LOG_INFO, "\n");
#endif
*poutbuf = NULL;
*poutbuf_size = 0;
s->fetch_timestamp = 1;
if (buf_size == 0 || s->last_pts != AV_NOPTS_VALUE)
{
if (pc->packet_index != pc->packet_start)
{
*poutbuf = pc->packet_buf + pc->packet_start;
*poutbuf_size = pc->packet_index - pc->packet_start;
}
pc->packet_start = pc->packet_index;
} else {
if (pc->packet_index != pc->packet_start)
{
memmove(pc->packet_buf, pc->packet_buf + pc->packet_start,
pc->packet_index - pc->packet_start);
pc->packet_index -= pc->packet_start;
pc->packet_start = 0;
}
}
if (buf_size + pc->packet_index > PARSE_BUF_SIZE)
return -1;
memcpy(pc->packet_buf + pc->packet_index, buf, buf_size);
pc->packet_index += buf_size;
return buf_size;
}
static void dvbsub_parse_close(AVCodecParserContext *s)
{
DVBSubParseContext *pc = s->priv_data;
av_freep(&pc->packet_buf);
}
AVCodecParser dvbsub_parser = {
{ CODEC_ID_DVB_SUBTITLE },
sizeof(DVBSubParseContext),
dvbsub_parse_init,
dvbsub_parse,
dvbsub_parse_close,
};
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