On Tue, 23 Oct 2012, Justin Ruggles wrote:

Only mono 8kHz is supported.
---
libavcodec/amrnbdec.c |    6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/libavcodec/amrnbdec.c b/libavcodec/amrnbdec.c
index 2cb06a6..cc318ac 100644
--- a/libavcodec/amrnbdec.c
+++ b/libavcodec/amrnbdec.c
@@ -43,6 +43,7 @@
#include <string.h>
#include <math.h>

+#include "libavutil/audioconvert.h"
#include "avcodec.h"
#include "dsputil.h"
#include "libavutil/common.h"
@@ -154,7 +155,10 @@ static av_cold int amrnb_decode_init(AVCodecContext *avctx)
    AMRContext *p = avctx->priv_data;
    int i;

-    avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
+    avctx->channels       = 1;
+    avctx->channel_layout = AV_CH_LAYOUT_MONO;
+    avctx->sample_rate    = 8000;
+    avctx->sample_fmt     = AV_SAMPLE_FMT_FLT;

    // p->excitation always points to the same position in p->excitation_buf
    p->excitation = &p->excitation_buf[PITCH_DELAY_MAX + LP_FILTER_ORDER + 1];
--
1.7.1

Ok

// Martin
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