Adding an ALAC enum to AudioDecoderConfig

This CL enables using the ALAC codec within the media pipeline.
This does not add ALAC support, as the ALAC codec is not part of the current build.

BUG=441343

Review URL: https://codereview.chromium.org/881603002

Cr-Commit-Position: refs/heads/master@{#313654}

1 files changed, 17 insertions, 1 deletions

diff --git a/media/base/audio_buffer.cc b/media/base/audio_buffer.cc
index 762e884..f118914 100644
--- a/media/base/audio_buffer.cc
+++ b/media/base/audio_buffer.cc
@@ -51,7 +51,8 @@ AudioBuffer::AudioBuffer(SampleFormat sample_format,
     return;
 
   if (sample_format == kSampleFormatPlanarF32 ||
-      sample_format == kSampleFormatPlanarS16) {
+      sample_format == kSampleFormatPlanarS16 ||
+      sample_format == kSampleFormatPlanarS32) {
     // Planar data, so need to allocate buffer for each channel.
     // Determine per channel data size, taking into account alignment.
     int block_size_per_channel =
@@ -254,6 +255,12 @@ static inline int32 ConvertF32ToS32(float value) {
                                 : value * std::numeric_limits<int32>::max());
 }
 
+// No need for conversion. Return value as is. Keeping function to align with
+// code structure.
+static inline int32 ConvertS32ToS32(int32 value) {
+  return value;
+}
+
 template <class Target, typename Converter>
 void InterleaveToS32(const std::vector<uint8*>& channel_data,
                      size_t frames_to_copy,
@@ -322,6 +329,14 @@ void AudioBuffer::ReadFramesInterleavedS32(int frames_to_copy,
                              dest_data,
                              ConvertF32ToS32);
       break;
+    case kSampleFormatPlanarS32:
+      // Format is planar signed 32 bit. Convert each value into int32 and
+      // insert into output channel data.
+      InterleaveToS32<int32>(channel_data_,
+                             frames_to_copy,
+                             trim_start_,
+                             dest_data,
+                             ConvertS32ToS32);
     case kUnknownSampleFormat:
       NOTREACHED();
       break;
@@ -365,6 +380,7 @@ void AudioBuffer::TrimRange(int start, int end) {
     switch (sample_format_) {
       case kSampleFormatPlanarS16:
       case kSampleFormatPlanarF32:
+      case kSampleFormatPlanarS32:
         // Planar data must be shifted per channel.
         for (int ch = 0; ch < channel_count_; ++ch) {
           memmove(channel_data_[ch] + (trim_start_ + start) * bytes_per_channel,