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// Copyright 2014 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/formats/webm/webm_audio_client.h"
#include "media/base/audio_decoder_config.h"
#include "media/base/channel_layout.h"
#include "media/formats/webm/webm_constants.h"
namespace media {
WebMAudioClient::WebMAudioClient(const LogCB& log_cb)
: log_cb_(log_cb) {
Reset();
}
WebMAudioClient::~WebMAudioClient() {
}
void WebMAudioClient::Reset() {
channels_ = -1;
samples_per_second_ = -1;
output_samples_per_second_ = -1;
}
bool WebMAudioClient::InitializeConfig(
const std::string& codec_id, const std::vector<uint8>& codec_private,
int64 seek_preroll, int64 codec_delay, bool is_encrypted,
AudioDecoderConfig* config) {
DCHECK(config);
SampleFormat sample_format = kSampleFormatPlanarF32;
AudioCodec audio_codec = kUnknownAudioCodec;
if (codec_id == "A_VORBIS") {
audio_codec = kCodecVorbis;
} else if (codec_id == "A_OPUS") {
audio_codec = kCodecOpus;
} else {
MEDIA_LOG(log_cb_) << "Unsupported audio codec_id " << codec_id;
return false;
}
if (samples_per_second_ <= 0)
return false;
// Set channel layout default if a Channels element was not present.
if (channels_ == -1)
channels_ = 1;
ChannelLayout channel_layout = GuessChannelLayout(channels_);
if (channel_layout == CHANNEL_LAYOUT_UNSUPPORTED) {
MEDIA_LOG(log_cb_) << "Unsupported channel count " << channels_;
return false;
}
int samples_per_second = samples_per_second_;
if (output_samples_per_second_ > 0)
samples_per_second = output_samples_per_second_;
// Always use 48kHz for OPUS. See the "Input Sample Rate" section of the
// spec: http://tools.ietf.org/html/draft-terriberry-oggopus-01#page-11
if (audio_codec == kCodecOpus) {
samples_per_second = 48000;
sample_format = kSampleFormatF32;
}
const uint8* extra_data = NULL;
size_t extra_data_size = 0;
if (codec_private.size() > 0) {
extra_data = &codec_private[0];
extra_data_size = codec_private.size();
}
// Convert |codec_delay| from nanoseconds into frames.
int codec_delay_in_frames = 0;
if (codec_delay != -1) {
codec_delay_in_frames =
0.5 +
samples_per_second * (static_cast<double>(codec_delay) /
base::Time::kNanosecondsPerSecond);
}
config->Initialize(
audio_codec,
sample_format,
channel_layout,
samples_per_second,
extra_data,
extra_data_size,
is_encrypted,
true,
base::TimeDelta::FromMicroseconds(
(seek_preroll != -1 ? seek_preroll : 0) / 1000),
codec_delay_in_frames);
return config->IsValidConfig();
}
bool WebMAudioClient::OnUInt(int id, int64 val) {
if (id == kWebMIdChannels) {
if (channels_ != -1) {
MEDIA_LOG(log_cb_) << "Multiple values for id " << std::hex << id
<< " specified. (" << channels_ << " and " << val
<< ")";
return false;
}
channels_ = val;
}
return true;
}
bool WebMAudioClient::OnFloat(int id, double val) {
double* dst = NULL;
switch (id) {
case kWebMIdSamplingFrequency:
dst = &samples_per_second_;
break;
case kWebMIdOutputSamplingFrequency:
dst = &output_samples_per_second_;
break;
default:
return true;
}
if (val <= 0)
return false;
if (*dst != -1) {
MEDIA_LOG(log_cb_) << "Multiple values for id " << std::hex << id
<< " specified (" << *dst << " and " << val << ")";
return false;
}
*dst = val;
return true;
}
} // namespace media
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