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avcodec/dsddec: correct for DSD silence bit-ordering

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Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Takayuki 'January June' Suwa 2017-04-01 02:14:13 +09:00 committed by Michael Niedermayer
parent 6200bf89a8
commit e3d8963c3c
1 changed files with 10 additions and 7 deletions
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17
libavcodec/dsddec.c
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@ -31,10 +31,18 @@
#include "avcodec.h" #include "avcodec.h"
#include "dsd.h" #include "dsd.h"
#define DSD_SILENCE 0x69
/* 0x69 = 01101001
* This pattern "on repeat" makes a low energy 352.8 kHz tone
* and a high energy 1.0584 MHz tone which should be filtered
* out completely by any playback system --> silence
*/
static av_cold int decode_init(AVCodecContext *avctx) static av_cold int decode_init(AVCodecContext *avctx)
{ {
DSDContext * s; DSDContext * s;
int i; int i;
uint8_t silence;
ff_init_dsd_data(); ff_init_dsd_data();
@ -42,15 +50,10 @@ static av_cold int decode_init(AVCodecContext *avctx)
if (!s) if (!s)
return AVERROR(ENOMEM); return AVERROR(ENOMEM);
silence = avctx->codec_id == AV_CODEC_ID_DSD_LSBF || avctx->codec_id == AV_CODEC_ID_DSD_LSBF_PLANAR ? ff_reverse[DSD_SILENCE] : DSD_SILENCE;
for (i = 0; i < avctx->channels; i++) { for (i = 0; i < avctx->channels; i++) {
s[i].pos = 0; s[i].pos = 0;
memset(s[i].buf, 0x69, sizeof(s[i].buf)); memset(s[i].buf, silence, sizeof(s[i].buf));
/* 0x69 = 01101001
* This pattern "on repeat" makes a low energy 352.8 kHz tone
* and a high energy 1.0584 MHz tone which should be filtered
* out completely by any playback system --> silence
*/
} }
avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;