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AMV audio decoder

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Originally committed as revision 10598 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2007-09-27 06:21:57 +00:00
parent 815d96a65d
commit 3a7f5d072a
4 changed files with 18 additions and 2 deletions
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1
libavcodec/Makefile
View File

@ -263,6 +263,7 @@ OBJS-$(CONFIG_ADPCM_EA_DECODER) += adpcm.o
OBJS-$(CONFIG_ADPCM_EA_ENCODER) += adpcm.o
OBJS-$(CONFIG_ADPCM_G726_DECODER) += g726.o
OBJS-$(CONFIG_ADPCM_G726_ENCODER) += g726.o
OBJS-$(CONFIG_ADPCM_IMA_AMV_DECODER) += adpcm.o
OBJS-$(CONFIG_ADPCM_IMA_DK3_DECODER) += adpcm.o
OBJS-$(CONFIG_ADPCM_IMA_DK3_ENCODER) += adpcm.o
OBJS-$(CONFIG_ADPCM_IMA_DK4_DECODER) += adpcm.o

17
libavcodec/adpcm.c
View File

@ -1182,16 +1182,28 @@ static int adpcm_decode_frame(AVCodecContext *avctx,
}
}
break;
case CODEC_ID_ADPCM_IMA_AMV:
case CODEC_ID_ADPCM_IMA_SMJPEG:
c->status[0].predictor = *src;
src += 2;
c->status[0].step_index = *src++;
src++; /* skip another byte before getting to the meat */
if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV)
src+=4;
while (src < buf + buf_size) {
char hi, lo;
lo = *src & 0x0F;
hi = (*src >> 4) & 0x0F;
if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV)
FFSWAP(char, hi, lo);
*samples++ = adpcm_ima_expand_nibble(&c->status[0],
*src & 0x0F, 3);
lo, 3);
*samples++ = adpcm_ima_expand_nibble(&c->status[0],
(*src >> 4) & 0x0F, 3);
hi, 3);
src++;
}
break;
@ -1439,6 +1451,7 @@ ADPCM_ENCODER(id,name) ADPCM_DECODER(id,name)
ADPCM_CODEC(CODEC_ID_ADPCM_4XM, adpcm_4xm);
ADPCM_CODEC(CODEC_ID_ADPCM_CT, adpcm_ct);
ADPCM_CODEC(CODEC_ID_ADPCM_EA, adpcm_ea);
ADPCM_CODEC(CODEC_ID_ADPCM_IMA_AMV, adpcm_ima_amv);
ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3);
ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4);
ADPCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt);

1
libavcodec/allcodecs.c
View File

@ -246,6 +246,7 @@ void avcodec_register_all(void)
REGISTER_ENCDEC (ADPCM_CT, adpcm_ct);
REGISTER_ENCDEC (ADPCM_EA, adpcm_ea);
REGISTER_ENCDEC (ADPCM_G726, adpcm_g726);
REGISTER_DECODER (ADPCM_IMA_AMV, adpcm_ima_amv);
REGISTER_ENCDEC (ADPCM_IMA_DK3, adpcm_ima_dk3);
REGISTER_ENCDEC (ADPCM_IMA_DK4, adpcm_ima_dk4);
REGISTER_ENCDEC (ADPCM_IMA_QT, adpcm_ima_qt);

1
libavcodec/avcodec.h
View File

@ -208,6 +208,7 @@ enum CodecID {
CODEC_ID_ADPCM_SBPRO_3,
CODEC_ID_ADPCM_SBPRO_2,
CODEC_ID_ADPCM_THP,
CODEC_ID_ADPCM_IMA_AMV,
/* AMR */
CODEC_ID_AMR_NB= 0x12000,