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// 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 "media/base/limits.h"
#include "media/base/media_util.h"
namespace media {
AudioDecoderConfig::AudioDecoderConfig() {}
AudioDecoderConfig::AudioDecoderConfig(AudioCodec codec,
SampleFormat sample_format,
ChannelLayout channel_layout,
int samples_per_second,
const std::vector<uint8_t>& extra_data,
EncryptionScheme encryption_scheme) {
Initialize(codec, sample_format, channel_layout, samples_per_second,
extra_data, encryption_scheme, base::TimeDelta(), 0);
}
AudioDecoderConfig::AudioDecoderConfig(const AudioDecoderConfig& other) =
default;
void AudioDecoderConfig::Initialize(AudioCodec codec,
SampleFormat sample_format,
ChannelLayout channel_layout,
int samples_per_second,
const std::vector<uint8_t>& extra_data,
EncryptionScheme encryption_scheme,
base::TimeDelta seek_preroll,
int codec_delay) {
codec_ = codec;
channel_layout_ = channel_layout;
samples_per_second_ = samples_per_second;
sample_format_ = sample_format;
bytes_per_channel_ = SampleFormatToBytesPerChannel(sample_format);
extra_data_ = extra_data;
encryption_scheme_ = encryption_scheme;
seek_preroll_ = seek_preroll;
codec_delay_ = codec_delay;
// If |channel_layout_| is CHANNEL_LAYOUT_DISCRETE, |channels_| and
// |bytes_per_frame_| will be overwritten in SetChannelsForDiscrete()
channels_ = ChannelLayoutToChannelCount(channel_layout_);
bytes_per_frame_ = channels_ * bytes_per_channel_;
should_discard_decoder_delay_ = true;
}
AudioDecoderConfig::~AudioDecoderConfig() = default;
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 &&
seek_preroll_ >= base::TimeDelta() && codec_delay_ >= 0;
}
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() == config.extra_data()) &&
(encryption_scheme() == config.encryption_scheme()) &&
(sample_format() == config.sample_format()) &&
(seek_preroll() == config.seek_preroll()) &&
(codec_delay() == config.codec_delay()) &&
(should_discard_decoder_delay() ==
config.should_discard_decoder_delay()) &&
(profile() == config.profile()));
}
std::string AudioDecoderConfig::AsHumanReadableString() const {
std::ostringstream s;
s << "codec: " << GetCodecName(codec())
<< ", profile: " << GetProfileName(profile())
<< ", bytes_per_channel: " << bytes_per_channel()
<< ", channel_layout: " << ChannelLayoutToString(channel_layout())
<< ", channels: " << channels()
<< ", samples_per_second: " << samples_per_second()
<< ", sample_format: " << SampleFormatToString(sample_format())
<< ", bytes_per_frame: " << bytes_per_frame()
<< ", seek_preroll: " << seek_preroll().InMicroseconds() << "us"
<< ", codec_delay: " << codec_delay()
<< ", has extra data: " << (extra_data().empty() ? "false" : "true")
<< ", encryption scheme: " << encryption_scheme()
<< ", discard decoder delay: "
<< (should_discard_decoder_delay() ? "true" : "false");
return s.str();
}
void AudioDecoderConfig::SetChannelsForDiscrete(int channels) {
DCHECK(channel_layout_ == CHANNEL_LAYOUT_DISCRETE ||
channels == ChannelLayoutToChannelCount(channel_layout_));
if (channels <= 0 || channels >= limits::kMaxChannels) {
DVLOG(1) << __func__ << ": Unsupported number of channels: " << channels;
return;
}
channels_ = channels;
bytes_per_frame_ = channels_ * bytes_per_channel_;
}
void AudioDecoderConfig::SetIsEncrypted(bool is_encrypted) {
if (!is_encrypted) {
DCHECK_NE(encryption_scheme_, EncryptionScheme::kUnencrypted)
<< "Config is already clear.";
encryption_scheme_ = EncryptionScheme::kUnencrypted;
} else {
DCHECK_EQ(encryption_scheme_, EncryptionScheme::kUnencrypted)
<< "Config is already encrypted.";
// TODO(xhwang): This is only used to guide decoder selection, so set
// a common encryption scheme that should be supported by all decrypting
// decoders. We should be able to remove this when we support switching
// decoders at run time. See http://crbug.com/695595
encryption_scheme_ = EncryptionScheme::kCenc;
}
}
} // namespace media
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