ffmpeg chromium glue

media/ffmpeg/ffmpeg_common.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/ffmpeg/ffmpeg_common.h"
 
 #include "base/logging.h"
 
 namespace media {
 
@@ skipping 192 matching lines @@
 
   // An even width makes things easier for YV12 and appears to be the behavior
   // expected by WebKit layout tests.
   return width & ~1;
 }
 
 void DestroyAVFormatContext(AVFormatContext* format_context) {
   DCHECK(format_context);
 
   // Iterate each stream and destroy each one of them.
-  int streams = format_context->nb_streams;
-  for (int i = 0; i < streams; ++i) {
-    AVStream* stream = format_context->streams[i];
+  if (format_context->streams) {
+    int streams = format_context->nb_streams;
+    for (int i = 0; i < streams; ++i) {
+      AVStream* stream = format_context->streams[i];
 
-    // The conditions for calling avcodec_close():
-    // 1. AVStream is alive.
-    // 2. AVCodecContext in AVStream is alive.
-    // 3. AVCodec in AVCodecContext is alive.
-    // Notice that closing a codec context without prior avcodec_open() will
-    // result in a crash in FFmpeg.
-    if (stream && stream->codec && stream->codec->codec) {
-      stream->discard = AVDISCARD_ALL;
-      avcodec_close(stream->codec);
+      // The conditions for calling avcodec_close():
+      // 1. AVStream is alive.
+      // 2. AVCodecContext in AVStream is alive.
+      // 3. AVCodec in AVCodecContext is alive.
+      // Notice that closing a codec context without prior avcodec_open() will
+      // result in a crash in FFmpeg.
+      if (stream && stream->codec && stream->codec->codec) {
+        stream->discard = AVDISCARD_ALL;
+        avcodec_close(stream->codec);
+      }
     }
   }
 
   // Then finally cleanup the format context.
   av_close_input_file(format_context);
 }
 
 }  // namespace media