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      1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "media/webm/webm_audio_client.h"
      6 
      7 #include "media/base/audio_decoder_config.h"
      8 #include "media/base/channel_layout.h"
      9 #include "media/webm/webm_constants.h"
     10 
     11 namespace media {
     12 
     13 WebMAudioClient::WebMAudioClient(const LogCB& log_cb)
     14     : log_cb_(log_cb) {
     15   Reset();
     16 }
     17 
     18 WebMAudioClient::~WebMAudioClient() {
     19 }
     20 
     21 void WebMAudioClient::Reset() {
     22   channels_ = -1;
     23   samples_per_second_ = -1;
     24   output_samples_per_second_ = -1;
     25 }
     26 
     27 bool WebMAudioClient::InitializeConfig(
     28     const std::string& codec_id, const std::vector<uint8>& codec_private,
     29     int64 seek_preroll, int64 codec_delay, bool is_encrypted,
     30     AudioDecoderConfig* config) {
     31   DCHECK(config);
     32 
     33   AudioCodec audio_codec = kUnknownAudioCodec;
     34   if (codec_id == "A_VORBIS") {
     35     audio_codec = kCodecVorbis;
     36   } else if (codec_id == "A_OPUS") {
     37     audio_codec = kCodecOpus;
     38   } else {
     39     MEDIA_LOG(log_cb_) << "Unsupported audio codec_id " << codec_id;
     40     return false;
     41   }
     42 
     43   if (samples_per_second_ <= 0)
     44     return false;
     45 
     46   // Set channel layout default if a Channels element was not present.
     47   if (channels_ == -1)
     48     channels_ = 1;
     49 
     50   ChannelLayout channel_layout =  GuessChannelLayout(channels_);
     51 
     52   if (channel_layout == CHANNEL_LAYOUT_UNSUPPORTED) {
     53     MEDIA_LOG(log_cb_) << "Unsupported channel count " << channels_;
     54     return false;
     55   }
     56 
     57   int samples_per_second = samples_per_second_;
     58   if (output_samples_per_second_ > 0)
     59     samples_per_second = output_samples_per_second_;
     60 
     61   const uint8* extra_data = NULL;
     62   size_t extra_data_size = 0;
     63   if (codec_private.size() > 0) {
     64     extra_data = &codec_private[0];
     65     extra_data_size = codec_private.size();
     66   }
     67 
     68   config->Initialize(
     69       audio_codec,
     70       (audio_codec == kCodecOpus) ? kSampleFormatS16 : kSampleFormatPlanarF32,
     71       channel_layout,
     72       samples_per_second, extra_data, extra_data_size, is_encrypted, true,
     73       base::TimeDelta::FromMicroseconds(
     74           (seek_preroll != -1 ? seek_preroll : 0) / 1000),
     75       base::TimeDelta::FromMicroseconds(
     76           (codec_delay != -1 ? codec_delay : 0) / 1000));
     77   return config->IsValidConfig();
     78 }
     79 
     80 bool WebMAudioClient::OnUInt(int id, int64 val) {
     81   if (id == kWebMIdChannels) {
     82     if (channels_ != -1) {
     83       MEDIA_LOG(log_cb_) << "Multiple values for id " << std::hex << id
     84                          << " specified. (" << channels_ << " and " << val
     85                          << ")";
     86       return false;
     87     }
     88 
     89     channels_ = val;
     90   }
     91   return true;
     92 }
     93 
     94 bool WebMAudioClient::OnFloat(int id, double val) {
     95   double* dst = NULL;
     96 
     97   switch (id) {
     98     case kWebMIdSamplingFrequency:
     99       dst = &samples_per_second_;
    100       break;
    101     case kWebMIdOutputSamplingFrequency:
    102       dst = &output_samples_per_second_;
    103       break;
    104     default:
    105       return true;
    106   }
    107 
    108   if (val <= 0)
    109     return false;
    110 
    111   if (*dst != -1) {
    112     MEDIA_LOG(log_cb_) << "Multiple values for id " << std::hex << id
    113                        << " specified (" << *dst << " and " << val << ")";
    114     return false;
    115   }
    116 
    117   *dst = val;
    118   return true;
    119 }
    120 
    121 }  // namespace media
    122