From 96ddaff5ec76f40d4ea6d00f07ff246388db4835 Mon Sep 17 00:00:00 2001
From: Michel Bardiaux <mbardiaux@mediaxim.be>
Date: Fri, 25 Apr 2008 13:05:15 +0000
Subject: [PATCH] Allow bitrates zero and 13200 (needed for decoding mov and
 aiff)

Originally committed as revision 12953 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/libgsm.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/libavcodec/libgsm.c b/libavcodec/libgsm.c
index 3ae5567f72..82e00b1f51 100644
--- a/libavcodec/libgsm.c
+++ b/libavcodec/libgsm.c
@@ -36,8 +36,23 @@
 #define GSM_FRAME_SIZE 160
 
 static av_cold int libgsm_init(AVCodecContext *avctx) {
-    if (avctx->channels > 1 || avctx->sample_rate != 8000 || avctx->bit_rate != 13000)
+    if (avctx->channels > 1) {
+        av_log(avctx, AV_LOG_ERROR, "Mono required for GSM, got %d channels\n",
+               avctx->channels);
         return -1;
+    }
+    if (avctx->sample_rate != 8000) {
+        av_log(avctx, AV_LOG_ERROR, "Sample rate 8000Hz required for GSM, got %dHz\n",
+               avctx->sample_rate);
+        return -1;
+    }
+    if (avctx->bit_rate != 13000 /* Official */ &&
+        avctx->bit_rate != 13200 /* Very common */ &&
+        avctx->bit_rate != 0 /* Unknown; a.o. mov does not set bitrate when decoding */ ) {
+        av_log(avctx, AV_LOG_ERROR, "Bitrate 13000bps required for GSM, got %dbps\n",
+               avctx->bit_rate);
+        return -1;
+    }
 
     avctx->priv_data = gsm_create();