michael@0: // Copyright (c) 2012 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #include "mp4_demuxer/audio_decoder_config.h"
michael@0: 
michael@0: #include <sstream>
michael@0: #include <string.h>
michael@0: 
michael@0: namespace mp4_demuxer {
michael@0: 
michael@0: static int SampleFormatToBitsPerChannel(SampleFormat sample_format) {
michael@0:   switch (sample_format) {
michael@0:     case kUnknownSampleFormat:
michael@0:       return 0;
michael@0:     case kSampleFormatU8:
michael@0:       return 8;
michael@0:     case kSampleFormatS16:
michael@0:     case kSampleFormatPlanarS16:
michael@0:       return 16;
michael@0:     case kSampleFormatS32:
michael@0:     case kSampleFormatF32:
michael@0:     case kSampleFormatPlanarF32:
michael@0:       return 32;
michael@0:     case kSampleFormatMax:
michael@0:       break;
michael@0:   }
michael@0: 
michael@0:   //NOTREACHED() << "Invalid sample format provided: " << sample_format;
michael@0:   return 0;
michael@0: }
michael@0: 
michael@0: AudioDecoderConfig::AudioDecoderConfig()
michael@0:     : codec_(kUnknownAudioCodec),
michael@0:       sample_format_(kUnknownSampleFormat),
michael@0:       bits_per_channel_(0),
michael@0:       channel_layout_(CHANNEL_LAYOUT_UNSUPPORTED),
michael@0:       samples_per_second_(0),
michael@0:       bytes_per_frame_(0),
michael@0:       is_encrypted_(false) {
michael@0: }
michael@0: 
michael@0: AudioDecoderConfig::AudioDecoderConfig(AudioCodec codec,
michael@0:                                        SampleFormat sample_format,
michael@0:                                        ChannelLayout channel_layout,
michael@0:                                        int samples_per_second,
michael@0:                                        const uint8_t* extra_data,
michael@0:                                        size_t extra_data_size,
michael@0:                                        bool is_encrypted) {
michael@0:   Initialize(codec, sample_format, channel_layout, samples_per_second,
michael@0:              extra_data, extra_data_size, is_encrypted);
michael@0: }
michael@0: 
michael@0: void AudioDecoderConfig::Initialize(AudioCodec codec,
michael@0:                                     SampleFormat sample_format,
michael@0:                                     ChannelLayout channel_layout,
michael@0:                                     int samples_per_second,
michael@0:                                     const uint8_t* extra_data,
michael@0:                                     size_t extra_data_size,
michael@0:                                     bool is_encrypted) {
michael@0:   CHECK((extra_data_size != 0) == (extra_data != NULL));
michael@0: 
michael@0:   codec_ = codec;
michael@0:   channel_layout_ = channel_layout;
michael@0:   samples_per_second_ = samples_per_second;
michael@0:   sample_format_ = sample_format;
michael@0:   bits_per_channel_ = SampleFormatToBitsPerChannel(sample_format);
michael@0:   extra_data_.assign(extra_data, extra_data + extra_data_size);
michael@0:   is_encrypted_ = is_encrypted;
michael@0: 
michael@0:   int channels = ChannelLayoutToChannelCount(channel_layout_);
michael@0:   bytes_per_frame_ = channels * bits_per_channel_ / 8;
michael@0: }
michael@0: 
michael@0: AudioDecoderConfig::~AudioDecoderConfig() {}
michael@0: 
michael@0: bool AudioDecoderConfig::IsValidConfig() const {
michael@0:   return codec_ != kUnknownAudioCodec &&
michael@0:          channel_layout_ != CHANNEL_LAYOUT_UNSUPPORTED &&
michael@0:          bits_per_channel_ > 0 &&
michael@0:          bits_per_channel_ <= kMaxBitsPerSample &&
michael@0:          samples_per_second_ > 0 &&
michael@0:          samples_per_second_ <= kMaxSampleRate &&
michael@0:          sample_format_ != kUnknownSampleFormat;
michael@0: }
michael@0: 
michael@0: bool AudioDecoderConfig::Matches(const AudioDecoderConfig& config) const {
michael@0:   return ((codec() == config.codec()) &&
michael@0:           (bits_per_channel() == config.bits_per_channel()) &&
michael@0:           (channel_layout() == config.channel_layout()) &&
michael@0:           (samples_per_second() == config.samples_per_second()) &&
michael@0:           (extra_data_size() == config.extra_data_size()) &&
michael@0:           (!extra_data() || !memcmp(extra_data(), config.extra_data(),
michael@0:                                     extra_data_size())) &&
michael@0:           (is_encrypted() == config.is_encrypted()) &&
michael@0:           (sample_format() == config.sample_format()));
michael@0: }
michael@0: 
michael@0: std::string AudioDecoderConfig::AsHumanReadableString() const {
michael@0:   std::ostringstream s;
michael@0:   s << "codec: " << codec()
michael@0:     << " bits/channel: " << bits_per_channel()
michael@0:     << " samples/s: " << samples_per_second()
michael@0:     << " has extra data? " << (extra_data() ? "true" : "false")
michael@0:     << " encrypted? " << (is_encrypted() ? "true" : "false");
michael@0:   return s.str();
michael@0: }
michael@0: 
michael@0: }  // namespace mp4_demuxer