| // Copyright 2016 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. |
| |
| #ifndef GARNET_BIN_MEDIAPLAYER_FFMPEG_LPCM_UTIL_H_ |
| #define GARNET_BIN_MEDIAPLAYER_FFMPEG_LPCM_UTIL_H_ |
| |
| #include <memory> |
| |
| #include "garnet/bin/mediaplayer/graph/types/audio_stream_type.h" |
| |
| namespace media_player { |
| |
| // Helper class that performs various LPCM processing functions. |
| class LpcmUtil { |
| public: |
| static std::unique_ptr<LpcmUtil> Create(const AudioStreamType& stream_type); |
| |
| virtual ~LpcmUtil() {} |
| |
| // Fills the buffer with silence. |
| virtual void Silence(void* buffer, size_t frame_count) const = 0; |
| |
| // Copies samples. |
| virtual void Copy(const void* in, void* out, size_t frame_count) const = 0; |
| |
| // Mixes samples. |
| virtual void Mix(const void* in, void* out, size_t frame_count) const = 0; |
| |
| // Interleaves non-interleaved samples. This assumes ffmpeg non-interleaved |
| // ("planar") layout, in which the buffer (in) is divided evenly into a |
| // channel buffer per channel. The samples for each channel are contiguous |
| // in the respective channel buffer with possible empty space at the end |
| // (hence the in_byte_count and the frame_count). |
| virtual void Interleave(const void* in, size_t in_byte_count, void* out, |
| size_t frame_count) const = 0; |
| }; |
| |
| } // namespace media_player |
| |
| #endif // GARNET_BIN_MEDIAPLAYER_FFMPEG_LPCM_UTIL_H_ |