| // Copyright 2014 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 MEDIA_FILTERS_FFMPEG_AAC_BITSTREAM_CONVERTER_H_ |
| #define MEDIA_FILTERS_FFMPEG_AAC_BITSTREAM_CONVERTER_H_ |
| |
| #include <stdint.h> |
| |
| #include "base/macros.h" |
| |
| #include "media/base/media_export.h" |
| #include "media/filters/ffmpeg_bitstream_converter.h" |
| |
| // Forward declarations for FFmpeg datatypes used. |
| struct AVCodecParameters; |
| struct AVPacket; |
| |
| namespace media { |
| |
| // Bitstream converter that adds ADTS headers to AAC frames. |
| class MEDIA_EXPORT FFmpegAACBitstreamConverter |
| : public FFmpegBitstreamConverter { |
| public: |
| enum { kAdtsHeaderSize = 7 }; |
| |
| // The |stream_codec_parameters| will be used during conversion and should be |
| // the AVCodecParameters for the stream sourcing these packets. A reference to |
| // |stream_codec_parameters| is retained, so it must outlive this class. |
| explicit FFmpegAACBitstreamConverter( |
| AVCodecParameters* stream_codec_parameters); |
| |
| FFmpegAACBitstreamConverter(const FFmpegAACBitstreamConverter&) = delete; |
| FFmpegAACBitstreamConverter& operator=(const FFmpegAACBitstreamConverter&) = |
| delete; |
| |
| ~FFmpegAACBitstreamConverter() override; |
| |
| // FFmpegBitstreamConverter implementation. |
| // Uses FFmpeg allocation methods for buffer allocation to ensure |
| // compatibility with FFmpeg's memory management. |
| bool ConvertPacket(AVPacket* packet) override; |
| |
| private: |
| // Variable to hold a pointer to memory where we can access the global |
| // data from the FFmpeg file format's global headers. |
| AVCodecParameters* stream_codec_parameters_; |
| |
| bool header_generated_; |
| uint8_t hdr_[kAdtsHeaderSize]; |
| int codec_; |
| int audio_profile_; |
| int sample_rate_index_; |
| int channel_configuration_; |
| int frame_length_; |
| }; |
| |
| } // namespace media |
| |
| #endif // MEDIA_FILTERS_FFMPEG_AAC_BITSTREAM_CONVERTER_H_ |