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Code Issues Releases Activity

avcodev/libdcadec: implement request_channel_layout

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Reviewed-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2015-07-08 21:16:25 -03:00
parent b457da4ce2
commit c118101662
1 changed files with 33 additions and 0 deletions
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33
libavcodec/libdcadec.c
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@ -34,6 +34,7 @@ typedef struct DCADecContext {
struct dcadec_context *ctx;
uint8_t *buffer;
int buffer_size;
int downmix_warned;
} DCADecContext;
static int dcadec_decode_frame(AVCodecContext *avctx, void *data,
@ -132,6 +133,17 @@ static int dcadec_decode_frame(AVCodecContext *avctx, void *data,
if (exss = dcadec_context_get_exss_info(s->ctx)) {
enum AVMatrixEncoding matrix_encoding = AV_MATRIX_ENCODING_NONE;
if (!s->downmix_warned) {
uint64_t layout = avctx->request_channel_layout;
if (((layout == AV_CH_LAYOUT_STEREO_DOWNMIX || layout == AV_CH_LAYOUT_STEREO) && !exss->embedded_stereo) ||
( layout == AV_CH_LAYOUT_5POINT1 && !exss->embedded_6ch))
av_log(avctx, AV_LOG_WARNING, "%s downmix was requested but no custom coefficients are available, "
"this may result in clipping\n",
layout == AV_CH_LAYOUT_5POINT1 ? "5.1" : "Stereo");
s->downmix_warned = 1;
}
switch(exss->matrix_encoding) {
case DCADEC_MATRIX_ENCODING_SURROUND:
matrix_encoding = AV_MATRIX_ENCODING_DOLBY;
@ -197,6 +209,27 @@ static av_cold int dcadec_init(AVCodecContext *avctx)
if (avctx->flags & CODEC_FLAG_BITEXACT)
flags |= DCADEC_FLAG_CORE_BIT_EXACT;
if (avctx->request_channel_layout > 0 && avctx->request_channel_layout != AV_CH_LAYOUT_NATIVE) {
switch (avctx->request_channel_layout) {
case AV_CH_LAYOUT_STEREO:
case AV_CH_LAYOUT_STEREO_DOWNMIX:
/* libdcadec ignores the 2ch flag if used alone when no custom downmix coefficients
are available, silently outputting a 5.1 downmix if possible instead.
Using both the 2ch and 6ch flags together forces a 2ch downmix using default
coefficients in such cases. This matches the behavior of the 6ch flag when used
alone, where a 5.1 downmix is generated if possible, regardless of custom
coefficients being available or not. */
flags |= DCADEC_FLAG_KEEP_DMIX_2CH | DCADEC_FLAG_KEEP_DMIX_6CH;
break;
case AV_CH_LAYOUT_5POINT1:
flags |= DCADEC_FLAG_KEEP_DMIX_6CH;
break;
default:
av_log(avctx, AV_LOG_WARNING, "Invalid request_channel_layout\n");
break;
}
}
s->ctx = dcadec_context_create(flags);
if (!s->ctx)
return AVERROR(ENOMEM);