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add Creative 8 bits ADPCM schemes support

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Originally committed as revision 5024 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs 2006-02-16 00:09:23 +00:00
parent dcadd216f1
commit 2433f24f60
5 changed files with 89 additions and 3 deletions
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1
doc/ffmpeg-doc.texi
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@ -833,6 +833,7 @@ other implementations.
@item Electronic Arts ADPCM @tab @tab X
@tab Used in various EA titles.
@item Creative ADPCM @tab @tab X
@tab 16 -> 4, 8 -> 4, 8 -> 3, 8 -> 2
@item RA144 @tab @tab X
@tab Real 14400 bit/s codec
@item RA288 @tab @tab X

75
libavcodec/adpcm.c
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@ -514,6 +514,34 @@ static inline short adpcm_ct_expand_nibble(ADPCMChannelStatus *c, char nibble)
return (short)predictor;
}
static inline short adpcm_sbpro_expand_nibble(ADPCMChannelStatus *c, char nibble, int size, int shift)
{
int sign, delta, diff;
sign = nibble & (1<<(size-1));
delta = nibble & ((1<<(size-1))-1);
diff = delta << (7 + c->step + shift);
if (sign)
c->predictor -= diff;
else
c->predictor += diff;
/* clamp result */
if (c->predictor > 16256)
c->predictor = 16256;
else if (c->predictor < -16384)
c->predictor = -16384;
/* calculate new step */
if (delta >= (2*size - 3) && c->step < 3)
c->step++;
else if (delta == 0 && c->step > 0)
c->step--;
return (short) c->predictor;
}
static inline short adpcm_yamaha_expand_nibble(ADPCMChannelStatus *c, unsigned char nibble)
{
if(!c->step) {
@ -644,7 +672,7 @@ static int adpcm_decode_frame(AVCodecContext *avctx,
samples = data;
src = buf;
st = avctx->channels == 2;
st = avctx->channels == 2 ? 1 : 0;
switch(avctx->codec->id) {
case CODEC_ID_ADPCM_IMA_QT:
@ -973,6 +1001,48 @@ static int adpcm_decode_frame(AVCodecContext *avctx,
src++;
}
break;
case CODEC_ID_ADPCM_SBPRO_4:
case CODEC_ID_ADPCM_SBPRO_3:
case CODEC_ID_ADPCM_SBPRO_2:
if (!c->status[0].step_index) {
/* the first byte is a raw sample */
*samples++ = 128 * (*src++ - 0x80);
if (st)
*samples++ = 128 * (*src++ - 0x80);
c->status[0].step_index = 1;
}
if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_4) {
while (src < buf + buf_size) {
*samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
(src[0] >> 4) & 0x0F, 4, 0);
*samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
src[0] & 0x0F, 4, 0);
src++;
}
} else if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_3) {
while (src < buf + buf_size) {
*samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
(src[0] >> 5) & 0x07, 3, 0);
*samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
(src[0] >> 2) & 0x07, 3, 0);
*samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
src[0] & 0x03, 2, 0);
src++;
}
} else {
while (src < buf + buf_size) {
*samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
(src[0] >> 6) & 0x03, 2, 2);
*samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
(src[0] >> 4) & 0x03, 2, 2);
*samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
(src[0] >> 2) & 0x03, 2, 2);
*samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
src[0] & 0x03, 2, 2);
src++;
}
}
break;
case CODEC_ID_ADPCM_SWF:
{
GetBitContext gb;
@ -1117,5 +1187,8 @@ ADPCM_CODEC(CODEC_ID_ADPCM_EA, adpcm_ea);
ADPCM_CODEC(CODEC_ID_ADPCM_CT, adpcm_ct);
ADPCM_CODEC(CODEC_ID_ADPCM_SWF, adpcm_swf);
ADPCM_CODEC(CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha);
ADPCM_CODEC(CODEC_ID_ADPCM_SBPRO_4, adpcm_sbpro_4);
ADPCM_CODEC(CODEC_ID_ADPCM_SBPRO_3, adpcm_sbpro_3);
ADPCM_CODEC(CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2);
#undef ADPCM_CODEC

3
libavcodec/allcodecs.c
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@ -593,6 +593,9 @@ PCM_CODEC(CODEC_ID_ADPCM_G726, adpcm_g726);
PCM_CODEC(CODEC_ID_ADPCM_CT, adpcm_ct);
PCM_CODEC(CODEC_ID_ADPCM_SWF, adpcm_swf);
PCM_CODEC(CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha);
PCM_CODEC(CODEC_ID_ADPCM_SBPRO_4, adpcm_sbpro_4);
PCM_CODEC(CODEC_ID_ADPCM_SBPRO_3, adpcm_sbpro_3);
PCM_CODEC(CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2);
#undef PCM_CODEC
/* subtitles */

10
libavcodec/avcodec.h
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@ -21,8 +21,8 @@ extern "C" {
#define AV_STRINGIFY(s) AV_TOSTRING(s)
#define AV_TOSTRING(s) #s
#define LIBAVCODEC_VERSION_INT ((51<<16)+(5<<8)+0)
#define LIBAVCODEC_VERSION 51.5.0
#define LIBAVCODEC_VERSION_INT ((51<<16)+(6<<8)+0)
#define LIBAVCODEC_VERSION 51.6.0
#define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT
#define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
@ -153,6 +153,9 @@ enum CodecID {
CODEC_ID_ADPCM_CT,
CODEC_ID_ADPCM_SWF,
CODEC_ID_ADPCM_YAMAHA,
CODEC_ID_ADPCM_SBPRO_4,
CODEC_ID_ADPCM_SBPRO_3,
CODEC_ID_ADPCM_SBPRO_2,
/* AMR */
CODEC_ID_AMR_NB= 0x12000,
@ -2271,6 +2274,9 @@ PCM_CODEC(CODEC_ID_ADPCM_G726, adpcm_g726);
PCM_CODEC(CODEC_ID_ADPCM_CT, adpcm_ct);
PCM_CODEC(CODEC_ID_ADPCM_SWF, adpcm_swf);
PCM_CODEC(CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha);
PCM_CODEC(CODEC_ID_ADPCM_SBPRO_4, adpcm_sbpro_4);
PCM_CODEC(CODEC_ID_ADPCM_SBPRO_3, adpcm_sbpro_3);
PCM_CODEC(CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2);
#undef PCM_CODEC

3
libavformat/voc.c
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@ -41,6 +41,9 @@ static const unsigned char voc_magic[] = "Creative Voice File\x1A";
static const CodecTag voc_codec_tags[] = {
{CODEC_ID_PCM_U8, 0x00},
{CODEC_ID_ADPCM_SBPRO_4, 0x01},
{CODEC_ID_ADPCM_SBPRO_3, 0x02},
{CODEC_ID_ADPCM_SBPRO_2, 0x03},
{CODEC_ID_PCM_S16LE, 0x04},
{CODEC_ID_PCM_ALAW, 0x06},
{CODEC_ID_PCM_MULAW, 0x07},