| // Copyright 2017 The Fuchsia 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 "src/media/audio/audio_core/audio_renderer_format_info.h" |
| |
| #include "src/media/audio/audio_core/audio_renderer_impl.h" |
| #include "src/media/audio/audio_core/mixer/constants.h" |
| |
| namespace media::audio { |
| |
| AudioRendererFormatInfo::AudioRendererFormatInfo( |
| fuchsia::media::AudioStreamType format) |
| : format_(format) { |
| // Precompute some useful timing/format stuff. |
| // |
| // Start with the ratio between frames and nanoseconds. |
| frames_per_ns_ = TimelineRate(format_.frames_per_second, ZX_SEC(1)); |
| |
| // Figure out the rate we need to scale by in order to produce our fixed |
| // point timestamps. |
| frame_to_media_ratio_ = TimelineRate(1 << kPtsFractionalBits, 1); |
| |
| // Figure out the total number of bytes in a packed frame. |
| switch (format_.sample_format) { |
| case fuchsia::media::AudioSampleFormat::UNSIGNED_8: |
| bytes_per_frame_ = 1; |
| break; |
| |
| case fuchsia::media::AudioSampleFormat::SIGNED_16: |
| bytes_per_frame_ = 2; |
| break; |
| |
| case fuchsia::media::AudioSampleFormat::SIGNED_24_IN_32: |
| case fuchsia::media::AudioSampleFormat::FLOAT: |
| bytes_per_frame_ = 4; |
| break; |
| |
| default: |
| // Format filtering was supposed to happen during |
| // AudioRendererImpl::SetStreamType. It should never be attempting to |
| // create a FormatInfo structure with a sample format that we do not |
| // understand. |
| FXL_CHECK(false) << "unrecognized sample format"; |
| bytes_per_frame_ = 2; |
| break; |
| } |
| |
| bytes_per_frame_ *= format_.channels; |
| } |
| |
| // static |
| fbl::RefPtr<AudioRendererFormatInfo> AudioRendererFormatInfo::Create( |
| fuchsia::media::AudioStreamType format) { |
| return fbl::AdoptRef(new AudioRendererFormatInfo(format)); |
| } |
| |
| } // namespace media::audio |