Standalone tool for processing files with Cast Audio pipeline.

Bug: 124534506
Test: cplay
Change-Id: I512e2b6d2f43d56c13d0dcf1dcf5d63778156135
Reviewed-on: https://chromium-review.googlesource.com/c/1479303
Commit-Queue: Benjamin Shaya <bshaya@chromium.org>
Auto-Submit: Benjamin Shaya <bshaya@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634357}

chromecast/media/cma/backend/BUILD.gn

@@ -191,6 +191,51 @@ cast_source_set("audio_resampler") {
   ]
 }
 
+cast_source_set("mixer_pipeline") {
+  sources = [
+    "audio_output_redirector_input.h",
+    "filter_group.cc",
+    "filter_group.h",
+    "mixer_input.cc",
+    "mixer_input.h",
+    "mixer_pipeline.cc",
+    "mixer_pipeline.h",
+    "post_processing_pipeline.h",
+    "post_processing_pipeline_impl.cc",
+    "post_processing_pipeline_impl.h",
+    "post_processing_pipeline_parser.cc",
+    "post_processing_pipeline_parser.h",
+  ]
+  deps = [
+    ":audio_buildflags",
+    ":audio_helpers",
+    ":audio_resampler",
+    ":cast_audio_json",
+    ":post_processor_factory",
+    ":public",
+    "//base",
+    "//chromecast/base",
+    "//chromecast/media/base",
+    "//chromecast/media/cma/base",
+    "//chromecast/media/cma/decoder",
+    "//chromecast/public",
+    "//chromecast/public/media",
+    "//media",
+    "//media:shared_memory_support",
+  ]
+}
+
+cast_source_set("volume_map") {
+  sources = [
+    "volume_map.cc",
+    "volume_map.h",
+  ]
+  deps = [
+    ":cast_audio_json",
+    "//base",
+  ]
+}
+
 cast_source_set("for_mixer_audio") {
   sources = [
     "audio_decoder_for_mixer.cc",
@@ -202,24 +247,11 @@ cast_source_set("for_mixer_audio") {
     "cast_media_shlib_mixer_audio.cc",
     "direct_mixer_source.cc",
     "direct_mixer_source.h",
-    "filter_group.cc",
-    "filter_group.h",
     "media_pipeline_backend_for_mixer.cc",
     "media_pipeline_backend_for_mixer.h",
-    "mixer_input.cc",
-    "mixer_input.h",
-    "mixer_pipeline.cc",
-    "mixer_pipeline.h",
-    "post_processing_pipeline.h",
-    "post_processing_pipeline_impl.cc",
-    "post_processing_pipeline_impl.h",
-    "post_processing_pipeline_parser.cc",
-    "post_processing_pipeline_parser.h",
     "stream_mixer.cc",
     "stream_mixer.h",
     "volume_control.cc",
-    "volume_map.cc",
-    "volume_map.h",
   ]
 
   deps = [
@@ -227,8 +259,10 @@ cast_source_set("for_mixer_audio") {
     ":audio_helpers",
     ":audio_resampler",
     ":cast_audio_json",
+    ":mixer_pipeline",
     ":post_processor_factory",
     ":public",
+    ":volume_map",
     "//base",
     "//chromecast/base",
     "//chromecast/media/audio:libcast_external_audio_pipeline_1.0",
@@ -278,8 +312,10 @@ test("cast_audio_backend_unittests") {
     ":av_sync_dummy",
     ":cast_audio_json",
     ":for_mixer_audio",
+    ":mixer_pipeline",
     ":null_video",
     ":public",
+    ":volume_map",
     "//base",
     "//base/test:run_all_unittests",
     "//chromecast/media/audio:fake_external_audio_pipeline",

chromecast/media/cma/backend/audio_output_redirector.cc

@@ -12,6 +12,7 @@
 #include "base/strings/pattern.h"
 #include "base/values.h"
 #include "chromecast/media/cma/backend/audio_fader.h"
+#include "chromecast/media/cma/backend/audio_output_redirector_input.h"
 #include "chromecast/media/cma/backend/mixer_input.h"
 #include "chromecast/media/cma/backend/stream_mixer.h"
 #include "chromecast/public/cast_media_shlib.h"

chromecast/media/cma/backend/audio_output_redirector.h

@@ -25,32 +25,6 @@ namespace chromecast {
 namespace media {
 class MixerInput;
 
-// Interface used by matching MixerInputs to pass audio data to an output
-// redirector.
-class AudioOutputRedirectorInput {
- public:
-  // Returns the relative order of the output redirector (used if there are
-  // multiple output redirectors that match a given MixerInput).
-  virtual int Order() = 0;
-
-  // Returns any extra delay that the output redirector will add. Used for A/V
-  // sync.
-  virtual int64_t GetDelayMicroseconds() = 0;
-
-  // Called to handle audio from a single input stream. Note that all audio
-  // output redirectors will receive this data, even if they are not first in
-  // the queue of redirectors; this is to allow smooth fading in/out when
-  // redirectors are added or removed.
-  virtual void Redirect(
-      ::media::AudioBus* const buffer,
-      int num_frames,
-      MediaPipelineBackend::AudioDecoder::RenderingDelay rendering_delay,
-      bool redirected) = 0;
-
- protected:
-  virtual ~AudioOutputRedirectorInput() = default;
-};
-
 // Empty interface so we can use a pointer to AudioOutputRedirector as the
 // token.
 class AudioOutputRedirectorToken {};

chromecast/media/cma/backend/audio_output_redirector_input.h

+// Copyright 2018 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.
+
+#ifndef CHROMECAST_MEDIA_CMA_BACKEND_AUDIO_OUTPUT_REDIRECTOR_INPUT_H_
+#define CHROMECAST_MEDIA_CMA_BACKEND_AUDIO_OUTPUT_REDIRECTOR_INPUT_H_
+
+namespace media {
+class AudioBus;
+}  // namespace media
+
+namespace chromecast {
+namespace media {
+
+// Interface used by matching MixerInputs to pass audio data to an output
+// redirector.
+class AudioOutputRedirectorInput {
+ public:
+  // Returns the relative order of the output redirector (used if there are
+  // multiple output redirectors that match a given MixerInput).
+  virtual int Order() = 0;
+
+  // Returns any extra delay that the output redirector will add. Used for A/V
+  // sync.
+  virtual int64_t GetDelayMicroseconds() = 0;
+
+  // Called to handle audio from a single input stream. Note that all audio
+  // output redirectors will receive this data, even if they are not first in
+  // the queue of redirectors; this is to allow smooth fading in/out when
+  // redirectors are added or removed.
+  virtual void Redirect(
+      ::media::AudioBus* const buffer,
+      int num_frames,
+      MediaPipelineBackend::AudioDecoder::RenderingDelay rendering_delay,
+      bool redirected) = 0;
+
+ protected:
+  virtual ~AudioOutputRedirectorInput() = default;
+};
+
+}  // namespace media
+}  // namespace chromecast
+
+#endif  // CHROMECAST_MEDIA_CMA_BACKEND_AUDIO_OUTPUT_REDIRECTOR_INPUT_H_

chromecast/media/cma/backend/cplay/BUILD.gn

+# Copyright 2019 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.
+
+executable("cplay") {
+  sources = [
+    "cplay.cc",
+    "wav_header.h",
+  ]
+  deps = [
+    "//base",
+    "//chromecast/media/cma/backend:cast_audio_json",
+    "//chromecast/media/cma/backend:mixer_pipeline",
+    "//chromecast/media/cma/backend:public",
+    "//chromecast/media/cma/backend:volume_map",
+    "//chromecast/public",
+    "//chromecast/public/media",
+    "//media",
+  ]
+}

chromecast/media/cma/backend/cplay/wav_header.h

+// Copyright 2019 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.
+
+#ifndef CHROMECAST_MEDIA_CMA_BACKEND_CPLAY_WAV_HEADER_H_
+#define CHROMECAST_MEDIA_CMA_BACKEND_CPLAY_WAV_HEADER_H_
+
+#include <stdint.h>
+
+namespace chromecast {
+namespace media {
+
+// From http://soundfile.sapp.org/doc/WaveFormat/
+struct __attribute__((packed)) WavHeader {
+  const char riff[4] = {'R', 'I', 'F', 'F'};
+  uint32_t chunk_size;  // size of file - 8
+  const char wave[4] = {'W', 'A', 'V', 'E'};
+  const char fmt[4] = {'f', 'm', 't', ' '};
+  const uint32_t subchunk_size = 16;
+  const uint16_t audio_format = 1;  // PCM
+  uint16_t num_channels;
+  uint32_t sample_rate;
+  uint32_t byte_rate;    // sample_rate * num_channels * bytes per sample
+  uint16_t block_align;  // num_channels * bytes per sample
+  uint16_t bits_per_sample;
+  const char data[4] = {'d', 'a', 't', 'a'};
+  uint32_t subchunk_2_size;  // bytes in the data
+
+  WavHeader();
+  ~WavHeader() = default;
+
+  void SetDataSize(int size_bytes) {
+    chunk_size = 36 + size_bytes;
+    subchunk_2_size = size_bytes;
+  }
+
+  void SetNumChannels(int num_channels_in) {
+    num_channels = num_channels_in;
+    byte_rate = sample_rate * num_channels * bits_per_sample / 8;
+    block_align = num_channels * bits_per_sample / 8;
+  }
+
+  void SetSampleRate(int sample_rate_in) {
+    sample_rate = sample_rate_in;
+    byte_rate = sample_rate * num_channels * bits_per_sample / 8;
+  }
+
+  void SetBitsPerSample(int bits_per_sample_in) {
+    bits_per_sample = bits_per_sample_in;
+    byte_rate = sample_rate * num_channels * bits_per_sample / 8;
+    block_align = num_channels * bits_per_sample / 8;
+  }
+};
+
+WavHeader::WavHeader() = default;
+
+}  // namespace media
+}  // namespace chromecast
+
+#endif  // CHROMECAST_MEDIA_CMA_BACKEND_CPLAY_WAV_HEADER_H_

chromecast/media/cma/backend/mixer_input.cc

@@ -14,7 +14,7 @@
 #include "base/bind_helpers.h"
 #include "base/logging.h"
 #include "chromecast/media/cma/backend/audio_fader.h"
-#include "chromecast/media/cma/backend/audio_output_redirector.h"
+#include "chromecast/media/cma/backend/audio_output_redirector_input.h"
 #include "chromecast/media/cma/backend/filter_group.h"
 #include "media/base/audio_bus.h"
 #include "media/base/audio_timestamp_helper.h"

chromecast/media/cma/backend/volume_map.h

@@ -32,13 +32,14 @@ class VolumeMap {
 
   float DbFSToVolume(float db);
 
+  void LoadVolumeMap(std::unique_ptr<base::Value> cast_audio_config);
+
  private:
   struct LevelToDb {
     float level;
     float db;
   };
 
-  void LoadVolumeMap(std::unique_ptr<base::Value> cast_audio_config);
   void UseDefaultVolumeMap();
 
   // |volume_map_| must be accessed with |lock_|.