[FFmpeg-devel] [PATCH] dsddec: correct for DSD silence bit-ordering
Takayuki 'January June' Suwa
jjsuwa.sys3175 at gmail.com
Fri Mar 31 20:14:13 EEST 2017
---
libavcodec/dsddec.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/libavcodec/dsddec.c b/libavcodec/dsddec.c
index 880d691..2c5c357 100644
--- a/libavcodec/dsddec.c
+++ b/libavcodec/dsddec.c
@@ -31,10 +31,18 @@
#include "avcodec.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)
{
DSDContext * s;
int i;
+ uint8_t silence;
ff_init_dsd_data();
@@ -42,15 +50,10 @@ static av_cold int decode_init(AVCodecContext *avctx)
if (!s)
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++) {
s[i].pos = 0;
- memset(s[i].buf, 0x69, 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
- */
+ memset(s[i].buf, silence, sizeof(s[i].buf));
}
avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
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