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adpcm_ima_ws: fix stereo decoding

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Stereo ADPCM IMA WS is planar for VQA version 3 and 2-sample interleaved for
VQA version 2.
This commit is contained in:
Justin Ruggles 2012-01-23 12:23:27 -05:00
parent 220506d23f
commit 02e7dbf5ad
2 changed files with 35 additions and 1 deletions
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30
libavcodec/adpcm.c
View File

@ -86,6 +86,7 @@ static const int swf_index_tables[4][16] = {
typedef struct ADPCMDecodeContext {
AVFrame frame;
ADPCMChannelStatus status[6];
int vqa_version; /**< VQA version. Used for ADPCM_IMA_WS */
} ADPCMDecodeContext;
static av_cold int adpcm_decode_init(AVCodecContext * avctx)
@ -126,6 +127,10 @@ static av_cold int adpcm_decode_init(AVCodecContext * avctx)
c->status[1].predictor = AV_RL32(avctx->extradata + 4);
}
break;
case CODEC_ID_ADPCM_IMA_WS:
if (avctx->extradata && avctx->extradata_size >= 42)
c->vqa_version = AV_RL16(avctx->extradata);
break;
default:
break;
}
@ -774,7 +779,6 @@ static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
*samples++ = adpcm_ima_expand_nibble(&c->status[st], v2, 3);
}
break;
case CODEC_ID_ADPCM_IMA_WS:
case CODEC_ID_ADPCM_IMA_APC:
while (src < buf + buf_size) {
uint8_t v = *src++;
@ -782,6 +786,30 @@ static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
*samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);
}
break;
case CODEC_ID_ADPCM_IMA_WS:
for (channel = 0; channel < avctx->channels; channel++) {
const uint8_t *src0;
int src_stride;
int16_t *smp = samples + channel;
if (c->vqa_version == 3) {
src0 = src + channel * buf_size / 2;
src_stride = 1;
} else {
src0 = src + channel;
src_stride = avctx->channels;
}
for (n = nb_samples / 2; n > 0; n--) {
uint8_t v = *src0;
src0 += src_stride;
*smp = adpcm_ima_expand_nibble(&c->status[channel], v >> 4 , 3);
smp += avctx->channels;
*smp = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);
smp += avctx->channels;
}
}
src = buf + buf_size;
break;
case CODEC_ID_ADPCM_XA:
while (buf_size >= 128) {
xa_decode(samples, src, &c->status[0], &c->status[1],

6
libavformat/westwood_vqa.c
View File

@ -128,6 +128,12 @@ static int wsvqa_read_header(AVFormatContext *s,
st->start_time = 0;
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->extradata_size = VQA_HEADER_SIZE;
st->codec->extradata = av_mallocz(VQA_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
memcpy(st->codec->extradata, header, VQA_HEADER_SIZE);
if (!sample_rate)
sample_rate = 22050;
st->codec->sample_rate = sample_rate;