media: Opus support for WebM in Media Source

media/base/audio_decoder_config.cc

 // Copyright (c) 2012 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/base/audio_decoder_config.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
+#include "base/time/time.h"
 #include "media/audio/sample_rates.h"
 #include "media/base/limits.h"
 #include "media/base/sample_format.h"
 
 namespace media {
 
 AudioDecoderConfig::AudioDecoderConfig()
     : codec_(kUnknownAudioCodec),
       sample_format_(kUnknownSampleFormat),
       bytes_per_channel_(0),
       channel_layout_(CHANNEL_LAYOUT_UNSUPPORTED),
       samples_per_second_(0),
       bytes_per_frame_(0),
       is_encrypted_(false) {
 }
 
 AudioDecoderConfig::AudioDecoderConfig(AudioCodec codec,
                                        SampleFormat sample_format,
                                        ChannelLayout channel_layout,
                                        int samples_per_second,
                                        const uint8* extra_data,
                                        size_t extra_data_size,
                                        bool is_encrypted) {
   Initialize(codec, sample_format, channel_layout, samples_per_second,
-             extra_data, extra_data_size, is_encrypted, true);
+             extra_data, extra_data_size, is_encrypted, true,
+             base::TimeDelta(), base::TimeDelta());
 }
 
 void AudioDecoderConfig::Initialize(AudioCodec codec,
                                     SampleFormat sample_format,
                                     ChannelLayout channel_layout,
                                     int samples_per_second,
                                     const uint8* extra_data,
                                     size_t extra_data_size,
                                     bool is_encrypted,
-                                    bool record_stats) {
+                                    bool record_stats,
+                                    base::TimeDelta seek_preroll,
+                                    base::TimeDelta codec_delay) {
   CHECK((extra_data_size != 0) == (extra_data != NULL));
 
   if (record_stats) {
     UMA_HISTOGRAM_ENUMERATION("Media.AudioCodec", codec, kAudioCodecMax);
     UMA_HISTOGRAM_ENUMERATION("Media.AudioSampleFormat", sample_format,
                               kSampleFormatMax);
     UMA_HISTOGRAM_ENUMERATION("Media.AudioChannelLayout", channel_layout,
                               CHANNEL_LAYOUT_MAX);
     AudioSampleRate asr = media::AsAudioSampleRate(samples_per_second);
     if (asr != kUnexpectedAudioSampleRate) {
       UMA_HISTOGRAM_ENUMERATION("Media.AudioSamplesPerSecond", asr,
                                 kUnexpectedAudioSampleRate);
     } else {
       UMA_HISTOGRAM_COUNTS(
           "Media.AudioSamplesPerSecondUnexpected", samples_per_second);
     }
   }
 
   codec_ = codec;
   channel_layout_ = channel_layout;
   samples_per_second_ = samples_per_second;
   sample_format_ = sample_format;
   bytes_per_channel_ = SampleFormatToBytesPerChannel(sample_format);
   extra_data_.assign(extra_data, extra_data + extra_data_size);
   is_encrypted_ = is_encrypted;
+  seek_preroll_ = seek_preroll;
+  codec_delay_ = codec_delay;
 
   int channels = ChannelLayoutToChannelCount(channel_layout_);
   bytes_per_frame_ = channels * bytes_per_channel_;
 }
 
 AudioDecoderConfig::~AudioDecoderConfig() {}
 
 bool AudioDecoderConfig::IsValidConfig() const {
   return codec_ != kUnknownAudioCodec &&
          channel_layout_ != CHANNEL_LAYOUT_UNSUPPORTED &&
          bytes_per_channel_ > 0 &&
          bytes_per_channel_ <= limits::kMaxBytesPerSample &&
          samples_per_second_ > 0 &&
          samples_per_second_ <= limits::kMaxSampleRate &&
-         sample_format_ != kUnknownSampleFormat;
+         sample_format_ != kUnknownSampleFormat &&
+         seek_preroll_ >= base::TimeDelta() &&
+         codec_delay_ >= base::TimeDelta();
 }
 
 bool AudioDecoderConfig::Matches(const AudioDecoderConfig& config) const {
   return ((codec() == config.codec()) &&
           (bytes_per_channel() == config.bytes_per_channel()) &&
           (channel_layout() == config.channel_layout()) &&
           (samples_per_second() == config.samples_per_second()) &&
           (extra_data_size() == config.extra_data_size()) &&
           (!extra_data() || !memcmp(extra_data(), config.extra_data(),
                                     extra_data_size())) &&
           (is_encrypted() == config.is_encrypted()) &&
-          (sample_format() == config.sample_format()));
+          (sample_format() == config.sample_format()) &&
+          (seek_preroll() == config.seek_preroll()) &&
+          (codec_delay() == config.codec_delay()));
 }
 
 }  // namespace media