[FFmpeg-devel] [PATCH] avformat/pcmdec: add support to set channel layout

[Paul B Mahol <onemda@gmail.com>]

Signed-off-by: Paul B Mahol <onemda@gmail.com>
---
 libavformat/pcmdec.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/libavformat/pcmdec.c b/libavformat/pcmdec.c
index c7da740541..775cda8cc7 100644
--- a/libavformat/pcmdec.c
+++ b/libavformat/pcmdec.c
@@ -22,6 +22,7 @@
 #include "config_components.h"
 
 #include "libavutil/avstring.h"
+#include "libavutil/channel_layout.h"
 #include "avformat.h"
 #include "internal.h"
 #include "pcm.h"
@@ -33,6 +34,7 @@ typedef struct PCMAudioDemuxerContext {
     AVClass *class;
     int sample_rate;
     int channels;
+    char *ch_layout_str;
 } PCMAudioDemuxerContext;
 
 static int pcm_read_header(AVFormatContext *s)
@@ -41,6 +43,7 @@ static int pcm_read_header(AVFormatContext *s)
     AVCodecParameters *par;
     AVStream *st;
     uint8_t *mime_type = NULL;
+    int ret;
 
     st = avformat_new_stream(s, NULL);
     if (!st)
@@ -50,7 +53,14 @@ static int pcm_read_header(AVFormatContext *s)
     par->codec_type  = AVMEDIA_TYPE_AUDIO;
     par->codec_id    = s->iformat->raw_codec_id;
     par->sample_rate = s1->sample_rate;
-    par->ch_layout.nb_channels = s1->channels;
+    if (s1->ch_layout_str) {
+        ret = av_channel_layout_from_string(&par->ch_layout,
+                                            s1->ch_layout_str);
+        if (ret < 0)
+            return ret;
+    } else {
+        par->ch_layout.nb_channels = s1->channels;
+    }
 
     av_opt_get(s->pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type);
     if (mime_type && s->iformat->mime_type) {
@@ -99,6 +109,7 @@ static int pcm_read_header(AVFormatContext *s)
 static const AVOption pcm_options[] = {
     { "sample_rate", "", offsetof(PCMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
     { "channels",    "", offsetof(PCMAudioDemuxerContext, channels),    AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
+    { "ch_layout",   "", offsetof(PCMAudioDemuxerContext, ch_layout_str),AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
     { NULL },
 };
 static const AVClass pcm_demuxer_class = {
-- 
2.33.0

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