[FFmpeg-devel] [PATCH] ADPCM IMA WAV 2, 3 and 5 bits decoder
Paul B Mahol
onemda at gmail.com
Thu Jul 4 00:28:39 CEST 2013
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
libavcodec/adpcm.c | 52 +++++++++++++++++++++++++++++++++++++----
libavcodec/adpcm_data.c | 23 ++++++++++++++++++-
libavcodec/adpcm_data.h | 4 ++++
libavcodec/get_bits.h | 61 ++++++++++++++++++++++++++++++++++---------------
libavcodec/utils.c | 4 +++-
5 files changed, 119 insertions(+), 25 deletions(-)
diff --git a/libavcodec/adpcm.c b/libavcodec/adpcm.c
index 1259bd4..ba34649 100644
--- a/libavcodec/adpcm.c
+++ b/libavcodec/adpcm.c
@@ -118,10 +118,8 @@ static av_cold int adpcm_decode_init(AVCodecContext * avctx)
c->status[0].step = c->status[1].step = 511;
break;
case AV_CODEC_ID_ADPCM_IMA_WAV:
- if (avctx->bits_per_coded_sample != 4) {
- av_log(avctx, AV_LOG_ERROR, "Only 4-bit ADPCM IMA WAV files are supported\n");
- return -1;
- }
+ if (avctx->bits_per_coded_sample < 2 || avctx->bits_per_coded_sample > 5)
+ return AVERROR_INVALIDDATA;
break;
case AV_CODEC_ID_ADPCM_IMA_APC:
if (avctx->extradata && avctx->extradata_size >= 8) {
@@ -188,6 +186,28 @@ static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble,
return (short)c->predictor;
}
+static inline int16_t adpcm_ima_wav_expand_nibble(ADPCMChannelStatus *c, GetBitContext *gb, int shift)
+{
+ int nibble, step_index, predictor, sign, delta, diff, step;
+
+ nibble = get_bits_le(gb, shift + 1),
+ step = ff_adpcm_step_table[c->step_index];
+ step_index = c->step_index + ff_adpcm_index_tables[shift - 1][nibble];
+ step_index = av_clip(step_index, 0, 88);
+
+ sign = nibble & (1 << shift);
+ delta = nibble & ((1 << shift) - 1);
+ diff = ((2 * delta + 1) * step) >> shift;
+ predictor = c->predictor;
+ if (sign) predictor -= diff;
+ else predictor += diff;
+
+ c->predictor = av_clip_int16(predictor);
+ c->step_index = step_index;
+
+ return (int16_t)c->predictor;
+}
+
static inline int adpcm_ima_qt_expand_nibble(ADPCMChannelStatus *c, int nibble, int shift)
{
int step_index;
@@ -557,10 +577,14 @@ static int get_nb_samples(AVCodecContext *avctx, GetByteContext *gb,
nb_samples = (buf_size - 4 * ch) * 2 / ch;
break;
case AV_CODEC_ID_ADPCM_IMA_WAV:
+ {
+ int bsize = ff_adpcm_ima_block_sizes[avctx->bits_per_coded_sample - 2];
+ int bsamples = ff_adpcm_ima_block_samples[avctx->bits_per_coded_sample - 2];
if (avctx->block_align > 0)
buf_size = FFMIN(buf_size, avctx->block_align);
- nb_samples = 1 + (buf_size - 4 * ch) / (4 * ch) * 8;
+ nb_samples = 1 + (buf_size - 4 * ch) / (bsize * ch) * bsamples;
break;
+ }
case AV_CODEC_ID_ADPCM_MS:
if (avctx->block_align > 0)
buf_size = FFMIN(buf_size, avctx->block_align);
@@ -720,6 +744,23 @@ static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
}
}
+ if (avctx->bits_per_coded_sample != 4) {
+ int samples_per_block = ff_adpcm_ima_block_samples[avctx->bits_per_coded_sample - 2];
+ GetBitContext g;
+
+ init_get_bits8(&g, gb.buffer, bytestream2_get_bytes_left(&gb));
+ for (n = 0; n < (nb_samples - 1) / samples_per_block; n++) {
+ for (i = 0; i < avctx->channels; i++) {
+ cs = &c->status[i];
+ samples = &samples_p[i][1 + n * samples_per_block];
+ for (m = 0; m < samples_per_block; m++) {
+ samples[m] = adpcm_ima_wav_expand_nibble(cs, &g,
+ avctx->bits_per_coded_sample - 1);
+ }
+ }
+ }
+ bytestream2_skip(&gb, avctx->block_align - avctx->channels * 4);
+ } else {
for (n = 0; n < (nb_samples - 1) / 8; n++) {
for (i = 0; i < avctx->channels; i++) {
cs = &c->status[i];
@@ -731,6 +772,7 @@ static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
}
}
}
+ }
break;
case AV_CODEC_ID_ADPCM_4XM:
for (i = 0; i < avctx->channels; i++)
diff --git a/libavcodec/adpcm_data.c b/libavcodec/adpcm_data.c
index 0625fc9..1d3e579 100644
--- a/libavcodec/adpcm_data.c
+++ b/libavcodec/adpcm_data.c
@@ -27,12 +27,33 @@
/* ff_adpcm_step_table[] and ff_adpcm_index_table[] are from the ADPCM
reference source */
-/* This is the index table: */
+static const int8_t adpcm_index_table2[4] = {
+ -1, 2,
+ -1, 2,
+};
+
+static const int8_t adpcm_index_table3[8] = {
+ -1, -1, 1, 2,
+ -1, -1, 1, 2,
+};
+
const int8_t ff_adpcm_index_table[16] = {
-1, -1, -1, -1, 2, 4, 6, 8,
-1, -1, -1, -1, 2, 4, 6, 8,
};
+static const int8_t adpcm_index_table5[32] = {
+ -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16,
+ -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16,
+};
+
+const int8_t const *ff_adpcm_index_tables[4] = {
+ &adpcm_index_table2[0],
+ &adpcm_index_table3[0],
+ &ff_adpcm_index_table[0],
+ &adpcm_index_table5[0],
+};
+
/**
* This is the step table. Note that many programs use slight deviations from
* this table, but such deviations are negligible:
diff --git a/libavcodec/adpcm_data.h b/libavcodec/adpcm_data.h
index 0ebb7c3..2f62c28 100644
--- a/libavcodec/adpcm_data.h
+++ b/libavcodec/adpcm_data.h
@@ -28,6 +28,10 @@
#include <stdint.h>
+static const uint8_t ff_adpcm_ima_block_sizes[4] = { 8, 12, 4, 20 };
+static const uint8_t ff_adpcm_ima_block_samples[4] = { 32, 32, 8, 32 };
+
+extern const int8_t const *ff_adpcm_index_tables[4];
extern const int8_t ff_adpcm_index_table[16];
extern const int16_t ff_adpcm_step_table[89];
extern const int16_t ff_adpcm_oki_step_table[49];
diff --git a/libavcodec/get_bits.h b/libavcodec/get_bits.h
index 4f4aa9a..b6cc75a 100644
--- a/libavcodec/get_bits.h
+++ b/libavcodec/get_bits.h
@@ -139,27 +139,34 @@ typedef struct RL_VLC_ELEM {
#define CLOSE_READER(name, gb) (gb)->index = name ## _index
+# ifdef LONG_BITSTREAM_READER
+
+# define UPDATE_CACHE_LE(name, gb) name ## _cache = \
+ AV_RL64((gb)->buffer + (name ## _index >> 3)) >> (name ## _index & 7)
+
+# define UPDATE_CACHE_BE(name, gb) name ## _cache = \
+ AV_RB64((gb)->buffer + (name ## _index >> 3)) >> (32 - (name ## _index & 7))
+
+#else
+
+# define UPDATE_CACHE_LE(name, gb) name ## _cache = \
+ AV_RL32((gb)->buffer + (name ## _index >> 3)) >> (name ## _index & 7)
+
+# define UPDATE_CACHE_BE(name, gb) name ## _cache = \
+ AV_RB32((gb)->buffer + (name ## _index >> 3)) << (name ## _index & 7)
+
+#endif
+
+
#ifdef BITSTREAM_READER_LE
-# ifdef LONG_BITSTREAM_READER
-# define UPDATE_CACHE(name, gb) name ## _cache = \
- AV_RL64((gb)->buffer + (name ## _index >> 3)) >> (name ## _index & 7)
-# else
-# define UPDATE_CACHE(name, gb) name ## _cache = \
- AV_RL32((gb)->buffer + (name ## _index >> 3)) >> (name ## _index & 7)
-# endif
+# define UPDATE_CACHE(name, gb) UPDATE_CACHE_LE(name, gb)
# define SKIP_CACHE(name, gb, num) name ## _cache >>= (num)
#else
-# ifdef LONG_BITSTREAM_READER
-# define UPDATE_CACHE(name, gb) name ## _cache = \
- AV_RB64((gb)->buffer + (name ## _index >> 3)) >> (32 - (name ## _index & 7))
-# else
-# define UPDATE_CACHE(name, gb) name ## _cache = \
- AV_RB32((gb)->buffer + (name ## _index >> 3)) << (name ## _index & 7)
-# endif
+# define UPDATE_CACHE(name, gb) UPDATE_CACHE_BE(name, gb)
# define SKIP_CACHE(name, gb, num) name ## _cache <<= (num)
@@ -180,12 +187,18 @@ typedef struct RL_VLC_ELEM {
#define LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num)
+#define SHOW_UBITS_LE(name, gb, num) zero_extend(name ## _cache, num)
+#define SHOW_SBITS_LE(name, gb, num) sign_extend(name ## _cache, num)
+
+#define SHOW_UBITS_BE(name, gb, num) NEG_USR32(name ## _cache, num)
+#define SHOW_SBITS_BE(name, gb, num) NEG_SSR32(name ## _cache, num)
+
#ifdef BITSTREAM_READER_LE
-# define SHOW_UBITS(name, gb, num) zero_extend(name ## _cache, num)
-# define SHOW_SBITS(name, gb, num) sign_extend(name ## _cache, num)
+# define SHOW_UBITS(name, gb, num) SHOW_UBITS_LE(name, gb, num)
+# define SHOW_SBITS(name, gb, num) SHOW_SBITS_LE(name, gb, num)
#else
-# define SHOW_UBITS(name, gb, num) NEG_USR32(name ## _cache, num)
-# define SHOW_SBITS(name, gb, num) NEG_SSR32(name ## _cache, num)
+# define SHOW_UBITS(name, gb, num) SHOW_UBITS_BE(name, gb, num)
+# define SHOW_SBITS(name, gb, num) SHOW_SBITS_BE(name, gb, num)
#endif
#define GET_CACHE(name, gb) ((uint32_t) name ## _cache)
@@ -250,6 +263,18 @@ static inline unsigned int get_bits(GetBitContext *s, int n)
return tmp;
}
+static inline unsigned int get_bits_le(GetBitContext *s, int n)
+{
+ register int tmp;
+ OPEN_READER(re, s);
+ av_assert2(n>0 && n<=25);
+ UPDATE_CACHE_LE(re, s);
+ tmp = SHOW_UBITS_LE(re, s, n);
+ LAST_SKIP_BITS(re, s, n);
+ CLOSE_READER(re, s);
+ return tmp;
+}
+
/**
* Show 1-25 bits.
*/
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index f26e260..d77b5ec 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -2899,7 +2899,9 @@ int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)
int blocks = frame_bytes / ba;
switch (avctx->codec_id) {
case AV_CODEC_ID_ADPCM_IMA_WAV:
- return blocks * (1 + (ba - 4 * ch) / (4 * ch) * 8);
+ if (bps < 2 || bps > 5)
+ return 0;
+ return blocks * (1 + (ba - 4 * ch) / (bps * ch) * 8);
case AV_CODEC_ID_ADPCM_IMA_DK3:
return blocks * (((ba - 16) * 2 / 3 * 4) / ch);
case AV_CODEC_ID_ADPCM_IMA_DK4:
--
1.7.11.2
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