Introduce VideoConfig/AudioConfig class for CMA backend

chromecast/media/cma/public/audio_config.cc

Index: chromecast/media/cma/public/audio_config.cc
diff --git a/chromecast/media/cma/public/audio_config.cc b/chromecast/media/cma/public/audio_config.cc
new file mode 100644
index 0000000000000000000000000000000000000000..78a21c8747eb04c4abbe4b6fcb1d3ad1473108f5
--- /dev/null
+++ b/chromecast/media/cma/public/audio_config.cc
@@ -0,0 +1,201 @@
+// 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 "chromecast/media/cma/public/audio_config.h"
+
+#include "base/logging.h"
+#include "media/base/audio_decoder_config.h"
+
+// Make sure the enum values of media::AudioCodec and
+// chromecast::media::AudioConfig::Codec are matched.
+#define STATIC_ASSERT_ENUM_MATCH_CODEC(name)                \
+  static_assert(                                            \
+      ::media::name == static_cast< ::media::AudioCodec>(   \
+        chromecast::media::AudioConfig::name),              \
+      #name " value must match in media and chromecast::media::AudioConfig.")
+
+// Make sure the enum values of media::ChannelLayout and
+// chromecast::media::AudioConfig::ChannelLayout are matched.
+#define STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(name)            \
+  static_assert(                                                 \
+      ::media::name == static_cast< ::media::ChannelLayout>(     \
+        chromecast::media::AudioConfig::name),                   \
+      #name " value must match in media and chromecast::media::AudioConfig.")
+
+namespace {
+
+// Maximum audio bytes per sample.
+static int kMaxBytesPerSample = 4;
+
+// Maximum audio sampling rate.
+static int kMaxSampleRate = 192000;
+
+}  // namespace
+
+namespace chromecast {
+namespace media {
+
+STATIC_ASSERT_ENUM_MATCH_CODEC(kUnknownAudioCodec);
+STATIC_ASSERT_ENUM_MATCH_CODEC(kCodecAAC);
+STATIC_ASSERT_ENUM_MATCH_CODEC(kCodecMP3);
+STATIC_ASSERT_ENUM_MATCH_CODEC(kCodecPCM);
+STATIC_ASSERT_ENUM_MATCH_CODEC(kCodecVorbis);
+STATIC_ASSERT_ENUM_MATCH_CODEC(kCodecFLAC);
+STATIC_ASSERT_ENUM_MATCH_CODEC(kCodecAMR_NB);
+STATIC_ASSERT_ENUM_MATCH_CODEC(kCodecAMR_WB);
+STATIC_ASSERT_ENUM_MATCH_CODEC(kCodecPCM_MULAW);
+STATIC_ASSERT_ENUM_MATCH_CODEC(kCodecGSM_MS);
+STATIC_ASSERT_ENUM_MATCH_CODEC(kCodecPCM_S16BE);
+STATIC_ASSERT_ENUM_MATCH_CODEC(kCodecPCM_S24BE);
+STATIC_ASSERT_ENUM_MATCH_CODEC(kCodecOpus);
+// STATIC_ASSERT_ENUM_MATCH_CODEC(kCodecEAC3);
+STATIC_ASSERT_ENUM_MATCH_CODEC(kCodecPCM_ALAW);
+STATIC_ASSERT_ENUM_MATCH_CODEC(kCodecALAC);
+
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_NONE);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_UNSUPPORTED);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_MONO);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_STEREO);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_2_1);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_SURROUND);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_4_0);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_2_2);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_QUAD);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_5_0);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_5_1);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_5_0_BACK);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_5_1_BACK);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_7_0);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_7_1);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_7_1_WIDE);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_STEREO_DOWNMIX);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_2POINT1);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_3_1);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_4_1);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_6_0);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_6_0_FRONT);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_HEXAGONAL);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_6_1);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_6_1_BACK);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_6_1_FRONT);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_7_0_FRONT);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_7_1_WIDE_BACK);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_OCTAGONAL);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_DISCRETE);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_STEREO_AND_KEYBOARD_MIC);
+STATIC_ASSERT_ENUM_MATCH_CHANNEL_LAYOUT(CHANNEL_LAYOUT_4_1_QUAD_SIDE);
+
+AudioConfig::AudioConfig()
+    : codec_(kUnknownAudioCodec),
+      channel_layout_(CHANNEL_LAYOUT_UNSUPPORTED),
+      channel_number_(0),
+      bytes_per_channel_(0),
+      samples_per_second_(0),
+      is_encrypted_(false) {}
+
+AudioConfig::AudioConfig(Codec codec,
+                         ChannelLayout channel_layout,
+                         int channel_number,
+                         int bytes_per_channel,
+                         int samples_per_second,
+                         const uint8* extra_data,
+                         size_t extra_data_size,
+                         bool is_encrypted) {
+  Initialize(codec, channel_layout, channel_number,
+             bytes_per_channel, samples_per_second,
+             extra_data, extra_data_size, is_encrypted);
+}
+
+void AudioConfig::Initialize(Codec codec,
+                             ChannelLayout channel_layout,
+                             int channel_number,
+                             int bytes_per_channel,
+                             int samples_per_second,
+                             const uint8* extra_data,
+                             size_t extra_data_size,
+                             bool is_encrypted) {
+  DCHECK((extra_data_size != 0) == (extra_data != NULL));
+
+  codec_ = codec;
+  channel_layout_ = channel_layout;
+  channel_number_ = channel_number;
+  bytes_per_channel_ = bytes_per_channel;
+  samples_per_second_ = samples_per_second;
+  extra_data_.assign(extra_data, extra_data + extra_data_size);
+  is_encrypted_ = is_encrypted;
+}
+
+AudioConfig::~AudioConfig() {}
+
+bool AudioConfig::IsValidConfig() const {
+  return codec_ != kUnknownAudioCodec &&
+         channel_layout_ != CHANNEL_LAYOUT_UNSUPPORTED &&
+         bytes_per_channel_ > 0 &&
+         bytes_per_channel_ <= kMaxBytesPerSample &&
+         samples_per_second_ > 0 &&
+         samples_per_second_ <= kMaxSampleRate;
+}
+
+bool AudioConfig::Matches(const AudioConfig& config) const {
+  return ((codec() == config.codec()) &&
+          (bytes_per_channel() == config.bytes_per_channel()) &&
+          (channel_number() == config.channel_number()) &&
+          (channel_layout() == config.channel_layout()) &&
+          (samples_per_second() == config.samples_per_second()) &&
+          (extra_data_size() == config.extra_data_size()) &&
+          (!extra_data() || !memcmp(extra_data(), config.extra_data(),
+                                    extra_data_size())) &&
+          (is_encrypted() == config.is_encrypted()));
+}
+
+std::string AudioConfig::AsHumanReadableString() const {
+  std::ostringstream s;
+  s << "codec: " << GetHumanReadableCodecName()
+    << " bytes_per_channel: " << bytes_per_channel()
+    << " channel_layout: " << channel_layout()
+    << " channel_number: " << channel_number()
+    << " samples_per_second: " << samples_per_second()
+    << " has extra data? " << (extra_data() ? "true" : "false")
+    << " encrypted? " << (is_encrypted() ? "true" : "false");
+  return s.str();
+}
+
+// These names come from src/third_party/ffmpeg/libavcodec/codec_desc.c
+std::string AudioConfig::GetHumanReadableCodecName() const {
+  switch (codec()) {
+    case kUnknownAudioCodec:
+      return "unknown";
+    case kCodecAAC:
+      return "aac";
+    case kCodecMP3:
+      return "mp3";
+    case kCodecPCM:
+    case kCodecPCM_S16BE:
+    case kCodecPCM_S24BE:
+      return "pcm";
+    case kCodecVorbis:
+      return "vorbis";
+    case kCodecFLAC:
+      return "flac";
+    case kCodecAMR_NB:
+      return "amr_nb";
+    case kCodecAMR_WB:
+      return "amr_wb";
+    case kCodecGSM_MS:
+      return "gsm_ms";
+    case kCodecPCM_ALAW:
+      return "pcm_alaw";
+    case kCodecPCM_MULAW:
+      return "pcm_mulaw";
+    case kCodecOpus:
+      return "opus";
+    case kCodecALAC:
+      return "alac";
+  }
+  NOTREACHED();
+  return "";
+}
+
+}  // namespace media
+}  // namespace chromecast