Consolidate and improve audio decoding test for all decoders.

media/filters/audio_file_reader.cc

Index: media/filters/audio_file_reader.cc
diff --git a/media/filters/audio_file_reader.cc b/media/filters/audio_file_reader.cc
index b20fd8d9ce35795b7ed94e5cea8177d80f0f25f0..cb8188e22b9b62eeb52c317b5403cab9d36e03a6 100644
--- a/media/filters/audio_file_reader.cc
+++ b/media/filters/audio_file_reader.cc
@@ -28,6 +28,12 @@ AudioFileReader::~AudioFileReader() {
 }
 
 bool AudioFileReader::Open() {
+  if (!OpenDemuxer())
+    return false;
+  return OpenDecoder();
+}
+
+bool AudioFileReader::OpenDemuxer() {
   glue_.reset(new FFmpegGlue(protocol_));
   AVFormatContext* format_context = glue_->format_context();
 
@@ -52,20 +58,21 @@ bool AudioFileReader::Open() {
   if (!codec_context_)
     return false;
 
-  int result = avformat_find_stream_info(format_context, NULL);
-  if (result < 0) {
-    DLOG(WARNING)
-        << "AudioFileReader::Open() : error in avformat_find_stream_info()";
-    return false;
-  }
+  const int result = avformat_find_stream_info(format_context, NULL);
+  DLOG_IF(WARNING, result < 0)
+      << "AudioFileReader::Open() : error in avformat_find_stream_info()";
+  return result >= 0;
+}
 
+bool AudioFileReader::OpenDecoder() {
   AVCodec* codec = avcodec_find_decoder(codec_context_->codec_id);
   if (codec) {
     // MP3 decodes to S16P which we don't support, tell it to use S16 instead.
     if (codec_context_->sample_fmt == AV_SAMPLE_FMT_S16P)
       codec_context_->request_sample_fmt = AV_SAMPLE_FMT_S16;
 
-    if ((result = avcodec_open2(codec_context_, codec, NULL)) < 0) {
+    const int result = avcodec_open2(codec_context_, codec, NULL);
+    if (result < 0) {
       DLOG(WARNING) << "AudioFileReader::Open() : could not open codec -"
                     << " result: " << result;
       return false;
@@ -79,8 +86,7 @@ bool AudioFileReader::Open() {
       return false;
     }
   } else {
-    DLOG(WARNING) << "AudioFileReader::Open() : could not find codec -"
-                  << " result: " << result;
+    DLOG(WARNING) << "AudioFileReader::Open() : could not find codec.";
     return false;
   }
 
@@ -96,7 +102,6 @@ bool AudioFileReader::Open() {
   channels_ = codec_context_->channels;
   sample_rate_ = codec_context_->sample_rate;
   av_sample_format_ = codec_context_->sample_fmt;
-
   return true;
 }
 
@@ -240,6 +245,10 @@ int AudioFileReader::GetNumberOfFrames() const {
   return static_cast<int>(ceil(GetDuration().InSecondsF() * sample_rate()));
 }
 
+bool AudioFileReader::OpenDemuxerForTesting() {
+  return OpenDemuxer();
+}
+
 bool AudioFileReader::ReadPacketForTesting(AVPacket* output_packet) {
   return ReadPacket(output_packet);
 }
@@ -257,4 +266,15 @@ bool AudioFileReader::ReadPacket(AVPacket* output_packet) {
   return false;
 }
 
+bool AudioFileReader::SeekForTesting(base::TimeDelta seek_time) {
+  return av_seek_frame(glue_->format_context(),
+                       stream_index_,
+                       ConvertToTimeBase(codec_context_->time_base, seek_time),
+                       AVSEEK_FLAG_BACKWARD) >= 0;
+}
+
+const AVStream* AudioFileReader::GetAVStreamForTesting() const {
+  return glue_->format_context()->streams[stream_index_];
+}
+
 }  // namespace media