From b1ec601f7f4d7fd5ae4a17b6efb4471b67c7ee06 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Reimar=20D=C3=B6ffinger?= <Reimar.Doeffinger@gmx.de>
Date: Thu, 23 Aug 2007 20:28:28 +0000
Subject: [PATCH] Add request_channels member to AVCodecContext so we now have
 a proper

way to tell the decoder how many output channels we would like.

Originally committed as revision 10199 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/avcodec.h | 11 +++++++++--
 libavcodec/dca.c     |  1 +
 libavcodec/utils.c   |  1 +
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 67d8985c08..11d78b55f3 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -33,8 +33,8 @@
 #define AV_STRINGIFY(s)         AV_TOSTRING(s)
 #define AV_TOSTRING(s) #s
 
-#define LIBAVCODEC_VERSION_INT  ((51<<16)+(41<<8)+0)
-#define LIBAVCODEC_VERSION      51.41.0
+#define LIBAVCODEC_VERSION_INT  ((51<<16)+(42<<8)+0)
+#define LIBAVCODEC_VERSION      51.42.0
 #define LIBAVCODEC_BUILD        LIBAVCODEC_VERSION_INT
 
 #define LIBAVCODEC_IDENT        "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
@@ -2123,6 +2123,13 @@ typedef struct AVCodecContext {
      * - decoding: unused
      */
     int64_t timecode_frame_start;
+
+    /**
+     * Decoder should decode to this many channels if it can (0 for default)
+     * - encoding: unused
+     * - decoding: Set by user.
+     */
+    int request_channels;
 } AVCodecContext;
 
 /**
diff --git a/libavcodec/dca.c b/libavcodec/dca.c
index d9bf03a58e..0426693d43 100644
--- a/libavcodec/dca.c
+++ b/libavcodec/dca.c
@@ -1158,6 +1158,7 @@ static int dca_decode_frame(AVCodecContext * avctx,
     avctx->bit_rate = s->bit_rate;
 
     channels = s->prim_channels + !!s->lfe;
+    avctx->channels = avctx->request_channels;
     if(avctx->channels == 0) {
         avctx->channels = channels;
     } else if(channels < avctx->channels) {
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 3b194899b3..9ca8a2d38e 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -753,6 +753,7 @@ static const AVOption options[]={
 {"timecode_frame_start", "GOP timecode frame start number, in non drop frame format", OFFSET(timecode_frame_start), FF_OPT_TYPE_INT, 0, 0, INT_MAX, V|E},
 {"drop_frame_timecode", NULL, 0, FF_OPT_TYPE_CONST, CODEC_FLAG2_DROP_FRAME_TIMECODE, INT_MIN, INT_MAX, V|E, "flags2"},
 {"non_linear_q", "use non linear quantizer", 0, FF_OPT_TYPE_CONST, CODEC_FLAG2_NON_LINEAR_QUANT, INT_MIN, INT_MAX, V|E, "flags2"},
+{"request_channels", "set desired number of audio channels", OFFSET(request_channels), FF_OPT_TYPE_INT, DEFAULT, 0, INT_MAX, A|D},
 {NULL},
 };