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@ -87,15 +87,15 @@ int FFAudioPlayer::open(const char *path) { |
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packet = av_packet_alloc(); |
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out_buffer = new uint8_t [BUFFER_SIZE]; |
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// 打开输入流
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// open input stream
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ret = avformat_open_input(&formatContext, path, nullptr, nullptr); |
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if (ret < 0) { |
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LOGE(AUDIO_TAG, "avformat_open_input error=%s", av_err2str(ret)); |
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return ret; |
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} |
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// 查找stream信息
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// (if need)find info: width、height、sample_rate、duration
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avformat_find_stream_info(formatContext, nullptr); |
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// 找到音频index
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// find audio index
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for (int i=0; i<formatContext->nb_streams; i++) { |
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if (AVMEDIA_TYPE_AUDIO == formatContext->streams[i]->codecpar->codec_type) { |
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audio_index = i; |
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@ -105,30 +105,30 @@ int FFAudioPlayer::open(const char *path) { |
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if (audio_index == -1) { |
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return -1; |
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} |
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// 找到codec
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// find audio decoder
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codec = avcodec_find_decoder(formatContext->streams[audio_index]->codecpar->codec_id); |
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codecContext = avcodec_alloc_context3(codec); |
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avcodec_parameters_to_context(codecContext, formatContext->streams[audio_index]->codecpar); |
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// 打开解码器
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// open decoder
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ret = avcodec_open2(codecContext, codec, nullptr); |
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if (ret < 0) { |
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LOGE(AUDIO_TAG, "avcodec_open2 error=%s", av_err2str(ret)); |
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return ret; |
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} |
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// 输入：采样率、声道布局、音频格式
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// input and output params
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int in_sample_rate = codecContext->sample_rate; |
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auto in_sample_fmt = codecContext->sample_fmt; |
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int in_ch_layout = (int)codecContext->channel_layout; |
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out_sample_rate = in_sample_rate; // 输出采样率等于输入采样率
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out_sample_fmt = AV_SAMPLE_FMT_S16; // 16位
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out_ch_layout = AV_CH_LAYOUT_STEREO; // 双声道
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out_sample_rate = in_sample_rate; |
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out_sample_fmt = AV_SAMPLE_FMT_S16; |
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out_ch_layout = AV_CH_LAYOUT_STEREO; |
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out_channel = codecContext->channels; |
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// 初始化音频格式转换上下文swrContext
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// init resample context
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swrContext = swr_alloc(); |
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swr_alloc_set_opts(swrContext, out_ch_layout, out_sample_fmt, out_sample_rate, |
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in_ch_layout, in_sample_fmt, in_sample_rate, 0, nullptr); |
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swr_init(swrContext); |
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// init filter graph
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filterFrame = av_frame_alloc(); |
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initFilter(FILTER_DESC, codecContext, &audioFilterGraph, |
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&audioSrcContext, &audioSinkContext); |
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@ -146,16 +146,16 @@ int FFAudioPlayer::getSampleRate() const { |
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int FFAudioPlayer::decodeAudio() { |
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int ret; |
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// 读取音频数据(解封装)
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// demux: read a frame(should be demux thread)
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ret = av_read_frame(formatContext, packet); |
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if (ret < 0) { |
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return ret; |
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} |
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// 判断是否位音频帧
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// see if audio packet
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if (packet->stream_index != audio_index) { |
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return 0; |
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} |
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// 解码音频帧
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// decode audio frame(should be decode thread)
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ret = avcodec_send_packet(codecContext, packet); |
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if (ret < 0) { |
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LOGE(AUDIO_TAG, "avcodec_send_packet=%s", av_err2str(ret)); |
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@ -168,6 +168,17 @@ int FFAudioPlayer::decodeAudio() { |
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return ret; |
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} |
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} |
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if (filterAgain) { |
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filterAgain = false; |
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avfilter_graph_free(&audioFilterGraph); |
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if ((ret = initFilter(filterDesc, codecContext, &audioFilterGraph, &audioSrcContext, &audioSinkContext)) < 0) { |
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LOGE(AUDIO_TAG, "init_filter error, ret=%d\n", ret); |
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return ret; |
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} |
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LOGE(AUDIO_TAG, "play again,filter_descr=_=%s", filterDesc); |
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} |
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// put into filter
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ret = av_buffersrc_add_frame(audioSrcContext, inputFrame); |
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if (ret < 0) { |
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@ -185,13 +196,13 @@ int FFAudioPlayer::decodeAudio() { |
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return ret; |
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} |
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// 音频格式转换
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// convert audio format and sample_rate
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swr_convert(swrContext, &out_buffer, BUFFER_SIZE, |
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(const uint8_t **)(filterFrame->data), filterFrame->nb_samples); |
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// 获取转换后缓冲区大小
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// get buffer size after converting
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int buffer_size = av_samples_get_buffer_size(nullptr, out_channel, |
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filterFrame->nb_samples, out_sample_fmt, 1); |
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LOGI(AUDIO_TAG, "buffer_size=%d", buffer_size); |
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av_frame_unref(inputFrame); |
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av_frame_unref(filterFrame); |
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av_packet_unref(packet); |
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@ -203,6 +214,14 @@ uint8_t *FFAudioPlayer::getDecodeFrame() const { |
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return out_buffer; |
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} |
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void FFAudioPlayer::setFilterAgain(bool again) { |
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filterAgain = again; |
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} |
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void FFAudioPlayer::setFilterDesc(const char *filterDescription) { |
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filterDesc = filterDescription; |
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} |
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void FFAudioPlayer::close() { |
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if (formatContext) { |
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avformat_close_input(&formatContext); |
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xufuji456
2 years ago