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Upgrade 20/24-bit PCM DVD decoder use SAMPLE_FMT_S32. Patch supplied by lars dot taeuber at gmx dot net.

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Originally committed as revision 14931 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Peter Ross 2008-08-23 22:45:03 +00:00
parent ee7948cb8d
commit 0cdc6ec941
1 changed files with 30 additions and 11 deletions
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41
libavcodec/pcm.c
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@ -327,7 +327,7 @@ static int pcm_decode_frame(AVCodecContext *avctx,
PCMDecode *s = avctx->priv_data;
int sample_size, c, n;
short *samples;
const uint8_t *src, *src2[MAX_CHANNELS];
const uint8_t *src, *src8, *src2[MAX_CHANNELS];
uint8_t *dstu8;
int16_t *dst_int16_t;
int32_t *dst_int32_t;
@ -467,18 +467,37 @@ static int pcm_decode_frame(AVCodecContext *avctx,
}
break;
case CODEC_ID_PCM_DVD:
if(avctx->bits_per_sample != 20 && avctx->bits_per_sample != 24) {
dst_int32_t = data;
n /= avctx->channels;
switch (avctx->bits_per_sample) {
case 20:
while (n--) {
c = avctx->channels;
src8 = src + 4*c;
while (c--) {
*dst_int32_t++ = (bytestream_get_be16(&src) << 16) + ((*src8 &0xf0) << 8);
*dst_int32_t++ = (bytestream_get_be16(&src) << 16) + ((*src8++ &0x0f) << 12);
}
src = src8;
}
break;
case 24:
while (n--) {
c = avctx->channels;
src8 = src + 4*c;
while (c--) {
*dst_int32_t++ = (bytestream_get_be16(&src) << 16) + ((*src8++) << 8);
*dst_int32_t++ = (bytestream_get_be16(&src) << 16) + ((*src8++) << 8);
}
src = src8;
}
break;
default:
av_log(avctx, AV_LOG_ERROR, "PCM DVD unsupported sample depth\n");
return -1;
} else {
int jump = avctx->channels * (avctx->bits_per_sample-16) / 4;
n = buf_size / (avctx->channels * 2 * avctx->bits_per_sample / 8);
while (n--) {
for (c=0; c < 2*avctx->channels; c++)
*samples++ = bytestream_get_be16(&src);
src += jump;
}
break;
}
samples = (short *) dst_int32_t;
break;
default:
return -1;
@ -528,7 +547,7 @@ AVCodec name ## _decoder = { \
/* Note: Do not forget to add new entries to the Makefile as well. */
PCM_CODEC (CODEC_ID_PCM_ALAW, SAMPLE_FMT_S16, pcm_alaw, "A-law PCM");
PCM_CODEC (CODEC_ID_PCM_DVD, SAMPLE_FMT_S16, pcm_dvd, "signed 16|20|24-bit big-endian PCM");
PCM_CODEC (CODEC_ID_PCM_DVD, SAMPLE_FMT_S32, pcm_dvd, "signed 20|24-bit big-endian PCM");
PCM_CODEC (CODEC_ID_PCM_F32BE, SAMPLE_FMT_FLT, pcm_f32be, "32-bit floating point big-endian PCM");
PCM_CODEC (CODEC_ID_PCM_F32LE, SAMPLE_FMT_FLT, pcm_f32le, "32-bit floating point little-endian PCM");
PCM_CODEC (CODEC_ID_PCM_F64BE, SAMPLE_FMT_DBL, pcm_f64be, "64-bit floating point big-endian PCM");