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* Refine AUTHORS.txt to AUTHORS.md, etc. 5.0.8 * Update README.md * Update README.md * Refine format for AUTHORS.md
82 lines
2.3 KiB
C++
82 lines
2.3 KiB
C++
//
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// Copyright (c) 2013-2021 The SRS Authors
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//
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// SPDX-License-Identifier: MIT
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//
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#ifndef SRS_APP_RTC_CODEC_HPP
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#define SRS_APP_RTC_CODEC_HPP
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#include <srs_core.hpp>
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#include <srs_kernel_codec.hpp>
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#include <string>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <libavutil/frame.h>
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#include <libavutil/mem.h>
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#include <libavcodec/avcodec.h>
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#include <libavutil/opt.h>
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#include <libavutil/channel_layout.h>
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#include <libavutil/samplefmt.h>
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#include <libswresample/swresample.h>
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#include <libavutil/audio_fifo.h>
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#ifdef __cplusplus
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}
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#endif
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class SrsAudioTranscoder
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{
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private:
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AVCodecContext *dec_;
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AVFrame *dec_frame_;
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AVPacket *dec_packet_;
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AVCodecContext *enc_;
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AVFrame *enc_frame_;
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AVPacket *enc_packet_;
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SwrContext *swr_;
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//buffer for swr out put
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uint8_t **swr_data_;
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AVAudioFifo *fifo_;
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int64_t new_pkt_pts_;
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int64_t next_out_pts_;
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public:
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SrsAudioTranscoder();
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virtual ~SrsAudioTranscoder();
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public:
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// Initialize the transcoder, transcode from codec as to codec.
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// The channels specifies the number of output channels for encoder, for example, 2.
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// The sample_rate specifies the sample rate of encoder, for example, 48000.
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// The bit_rate specifies the bitrate of encoder, for example, 48000.
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srs_error_t initialize(SrsAudioCodecId from, SrsAudioCodecId to, int channels, int sample_rate, int bit_rate);
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// Transcode the input audio frame in, as output audio frames outs.
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virtual srs_error_t transcode(SrsAudioFrame* in, std::vector<SrsAudioFrame*>& outs);
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// Free the generated audio frames by transcode.
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void free_frames(std::vector<SrsAudioFrame*>& frames);
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public:
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// Get the aac codec header, for example, FLV sequence header.
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// @remark User should never free the data, it's managed by this transcoder.
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void aac_codec_header(uint8_t** data, int* len);
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private:
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srs_error_t init_dec(SrsAudioCodecId from);
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srs_error_t init_enc(SrsAudioCodecId to, int channels, int samplerate, int bit_rate);
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srs_error_t init_swr(AVCodecContext* decoder);
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srs_error_t init_fifo();
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srs_error_t decode_and_resample(SrsAudioFrame* pkt);
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srs_error_t encode(std::vector<SrsAudioFrame*> &pkts);
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srs_error_t add_samples_to_fifo(uint8_t** samples, int frame_size);
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void free_swr_samples();
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};
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#endif /* SRS_APP_AUDIO_RECODE_HPP */
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