The Tor Browser: content/media/fmp4/demuxer/audio_decoder

     1 // Copyright (c) 2012 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.

     5 #include "mp4_demuxer/audio_decoder_config.h"

     7 #include <sstream>

     8 #include <string.h>

    10 namespace mp4_demuxer {

    12 static int SampleFormatToBitsPerChannel(SampleFormat sample_format) {

    13   switch (sample_format) {

    14     case kUnknownSampleFormat:

    15       return 0;

    16     case kSampleFormatU8:

    17       return 8;

    18     case kSampleFormatS16:

    19     case kSampleFormatPlanarS16:

    20       return 16;

    21     case kSampleFormatS32:

    22     case kSampleFormatF32:

    23     case kSampleFormatPlanarF32:

    24       return 32;

    25     case kSampleFormatMax:

    26       break;

    27   }

    29   //NOTREACHED() << "Invalid sample format provided: " << sample_format;

    30   return 0;

    31 }

    33 AudioDecoderConfig::AudioDecoderConfig()

    34     : codec_(kUnknownAudioCodec),

    35       sample_format_(kUnknownSampleFormat),

    36       bits_per_channel_(0),

    37       channel_layout_(CHANNEL_LAYOUT_UNSUPPORTED),

    38       samples_per_second_(0),

    39       bytes_per_frame_(0),

    40       is_encrypted_(false) {

    41 }

    43 AudioDecoderConfig::AudioDecoderConfig(AudioCodec codec,

    44                                        SampleFormat sample_format,

    45                                        ChannelLayout channel_layout,

    46                                        int samples_per_second,

    47                                        const uint8_t* extra_data,

    48                                        size_t extra_data_size,

    49                                        bool is_encrypted) {

    50   Initialize(codec, sample_format, channel_layout, samples_per_second,

    51              extra_data, extra_data_size, is_encrypted);

    52 }

    54 void AudioDecoderConfig::Initialize(AudioCodec codec,

    55                                     SampleFormat sample_format,

    56                                     ChannelLayout channel_layout,

    57                                     int samples_per_second,

    58                                     const uint8_t* extra_data,

    59                                     size_t extra_data_size,

    60                                     bool is_encrypted) {

    61   CHECK((extra_data_size != 0) == (extra_data != NULL));

    63   codec_ = codec;

    64   channel_layout_ = channel_layout;

    65   samples_per_second_ = samples_per_second;

    66   sample_format_ = sample_format;

    67   bits_per_channel_ = SampleFormatToBitsPerChannel(sample_format);

    68   extra_data_.assign(extra_data, extra_data + extra_data_size);

    69   is_encrypted_ = is_encrypted;

    71   int channels = ChannelLayoutToChannelCount(channel_layout_);

    72   bytes_per_frame_ = channels * bits_per_channel_ / 8;

    73 }

    75 AudioDecoderConfig::~AudioDecoderConfig() {}

    77 bool AudioDecoderConfig::IsValidConfig() const {

    78   return codec_ != kUnknownAudioCodec &&

    79          channel_layout_ != CHANNEL_LAYOUT_UNSUPPORTED &&

    80          bits_per_channel_ > 0 &&

    81          bits_per_channel_ <= kMaxBitsPerSample &&

    82          samples_per_second_ > 0 &&

    83          samples_per_second_ <= kMaxSampleRate &&

    84          sample_format_ != kUnknownSampleFormat;

    85 }

    87 bool AudioDecoderConfig::Matches(const AudioDecoderConfig& config) const {

    88   return ((codec() == config.codec()) &&

    89           (bits_per_channel() == config.bits_per_channel()) &&

    90           (channel_layout() == config.channel_layout()) &&

    91           (samples_per_second() == config.samples_per_second()) &&

    92           (extra_data_size() == config.extra_data_size()) &&

    93           (!extra_data() || !memcmp(extra_data(), config.extra_data(),

    94                                     extra_data_size())) &&

    95           (is_encrypted() == config.is_encrypted()) &&

    96           (sample_format() == config.sample_format()));

    97 }

    99 std::string AudioDecoderConfig::AsHumanReadableString() const {

   100   std::ostringstream s;

   101   s << "codec: " << codec()

   102     << " bits/channel: " << bits_per_channel()

   103     << " samples/s: " << samples_per_second()

   104     << " has extra data? " << (extra_data() ? "true" : "false")

   105     << " encrypted? " << (is_encrypted() ? "true" : "false");

   106   return s.str();

   107 }

   109 }  // namespace mp4_demuxer

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