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音频播放没啥好说的，直接复制这篇文章http://www.jianshu.com/p/68cdbee598cd
上代码
java
private void init() {setContentView(R.layout.activity_main); SurfaceView surfaceView = findViewById(R.id.surface_view); surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {@Override public void surfaceCreated(SurfaceHolder holder) {}@Override public void surfaceChanged(final SurfaceHolder holder, int format, int width, int height) {Thread thread = new Thread(){@Override public void run() {super.run(); String videoPath = "/storage/emulated/0/baiduNetdisk/season09.mp4"; // videoPlay(videoPath,holder.getSurface()); audioPlay(videoPath); }}; thread.start(); }@Override public void surfaceDestroyed(SurfaceHolder holder) {}}); }public AudioTrack createAudio(int sampleRateInHz, int nb_channels) {int channelConfig; if (nb_channels == 1) {channelConfig = AudioFormat.CHANNEL_OUT_MONO; } else if (nb_channels == 2) {channelConfig = AudioFormat.CHANNEL_OUT_STEREO; } else {channelConfig = AudioFormat.CHANNEL_OUT_STEREO; }int audioFormat = AudioFormat.ENCODING_PCM_16BIT; int minBufferSize = AudioTrack.getMinBufferSize(sampleRateInHz, channelConfig, audioFormat); AudioTrack audio = new AudioTrack(AudioManager.STREAM_MUSIC, // 指定流的类型 sampleRateInHz, // 设置音频数据的采样率 32k，如果是44.1k就是44100 channelConfig, // 设置输出声道为双声道立体声，而CHANNEL_OUT_MONO类型是单声道 audioFormat, // 设置音频数据块是8位还是16位，这里设置为16位。好像现在绝大多数的音频都是16位的了 minBufferSize, AudioTrack.MODE_STREAM // 设置模式类型，在这里设置为流类型，另外一种MODE_STATIC貌似没有什么效果 ); // audio.play(); // 启动音频设备，下面就可以真正开始音频数据的播放了 return audio; }调用c++代码
public native void audioPlay(String path);c++代码
#define MAX_AUDIO_FRME_SIZE 48000 * 4 extern "C" JNIEXPORT void JNICALL Java_com_example_ffmpegrun_MainActivity_audioPlay(JNIEnv *env, jobject instance, jstring path_) {const char *path = env->GetStringUTFChars(path_, 0); // TODO av_register_all(); AVFormatContext *fmt_ctx = avformat_alloc_context(); if (avformat_open_input(&fmt_ctx, path, NULL, NULL) < 0) {return; }if (avformat_find_stream_info(fmt_ctx, NULL) < 0) {return; }AVStream *avStream = NULL; int audio_stream_index = -1; for (int i = 0; i < fmt_ctx->nb_streams; i++) {if (fmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {avStream = fmt_ctx->streams[i]; audio_stream_index = i; break; }}if (audio_stream_index == -1) {return; }AVCodecContext *codec_ctx = avcodec_alloc_context3(NULL); avcodec_parameters_to_context(codec_ctx, avStream->codecpar); AVCodec *avCodec = avcodec_find_decoder(codec_ctx->codec_id); if (avcodec_open2(codec_ctx, avCodec, NULL) < 0) {return; }SwrContext *swr_ctx = swr_alloc(); enum AVSampleFormat in_sample_fmt = codec_ctx->sample_fmt; enum AVSampleFormat out_sample_fmt = AV_SAMPLE_FMT_S16; int in_sample_rate = codec_ctx->sample_rate; int out_sample_rate = in_sample_rate; uint64_t in_ch_layout = codec_ctx->channel_layout; uint64_t out_ch_layout = AV_CH_LAYOUT_STEREO; swr_alloc_set_opts(swr_ctx, out_ch_layout, out_sample_fmt, out_sample_rate, in_ch_layout, in_sample_fmt, in_sample_rate, 0, NULL); swr_init(swr_ctx); int out_channel_nb = av_get_channel_layout_nb_channels(out_ch_layout); jclass player_class = env->GetObjectClass(instance); jmethodID create_audio_track_mid = env->GetMethodID(player_class, "createAudio", "(II)Landroid/media/AudioTrack;"); jobject audio_track = env->CallObjectMethod(instance, create_audio_track_mid, out_sample_rate, out_channel_nb); jclass audio_track_class = env->GetObjectClass(audio_track); jmethodID audio_track_play_mid = env->GetMethodID(audio_track_class, "play", "()V"); jmethodID audio_track_stop_mid = env->GetMethodID(audio_track_class, "stop", "()V"); env->CallVoidMethod(audio_track, audio_track_play_mid); jmethodID audio_track_write_mid = env->GetMethodID(audio_track_class, "write", "([BII)I"); uint8_t *out_buffer = (uint8_t *) av_malloc(MAX_AUDIO_FRME_SIZE); AVPacket *pkt = (AVPacket *) malloc(sizeof(AVPacket)); int ret; while (1) {if (av_read_frame(fmt_ctx, pkt) < 0){av_packet_unref(pkt); break; }ret = avcodec_send_packet(codec_ctx, pkt); if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF) {av_packet_unref(pkt); continue; }AVFrame *frame = av_frame_alloc(); ret = avcodec_receive_frame(codec_ctx, frame); if (ret < 0 && ret != AVERROR_EOF) {av_packet_unref(pkt); av_frame_free(&frame); continue; }swr_convert(swr_ctx, &out_buffer, MAX_AUDIO_FRME_SIZE, (const uint8_t **) frame->data, frame->nb_samples); int out_buffer_size = av_samples_get_buffer_size(NULL, out_channel_nb, frame->nb_samples, out_sample_fmt, 1); jbyteArray audio_sample_array = env->NewByteArray(out_buffer_size); jbyte *sample_bytep = env->GetByteArrayElements(audio_sample_array, NULL); memcpy(sample_bytep, out_buffer, (size_t) out_buffer_size); env->ReleaseByteArrayElements(audio_sample_array, sample_bytep, 0); env->CallIntMethod(audio_track, audio_track_write_mid, audio_sample_array, 0, out_buffer_size); env->DeleteLocalRef(audio_sample_array); av_frame_free(&frame); av_packet_unref(pkt); }env->CallVoidMethod(audio_track, audio_track_stop_mid); av_free(out_buffer); swr_free(&swr_ctx); avcodec_close(codec_ctx); avformat_close_input(&fmt_ctx); env->ReleaseStringUTFChars(path_, path); }引入的包
extern "C" { #include "libavformat/avformat.h" #include "libavfilter/avfiltergraph.h" #include <libswresample/swresample.h> }AudioTrack还是挺好的，可以正常播放声音，不需要进行其他设置，看别人有用opensl来播放音频，没研究过，听说很强大
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