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161 lines
5.7 KiB
161 lines
5.7 KiB
//
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// Created by frank on 2018/2/1.
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//
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#include <jni.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <android/log.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "libavformat/avformat.h"
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#include "libavcodec/avcodec.h"
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#include "libswscale/swscale.h"
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#include "libswresample/swresample.h"
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#include "ffmpeg_jni_define.h"
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#ifdef __cplusplus
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}
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#endif
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#define TAG "AudioPlayer"
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#define MAX_AUDIO_FRAME_SIZE 48000 * 4
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AUDIO_PLAYER_FUNC(void, play, jstring input_jstr) {
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const char *input_cstr = env->GetStringUTFChars(input_jstr, NULL);
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LOGI(TAG, "input url=%s", input_cstr);
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//register all modules
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av_register_all();
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AVFormatContext *pFormatCtx = avformat_alloc_context();
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//open the audio file
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if (avformat_open_input(&pFormatCtx, input_cstr, NULL, NULL) != 0) {
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LOGE(TAG, "Couldn't open the audio file!");
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return;
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}
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//find all streams info
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if (avformat_find_stream_info(pFormatCtx, NULL) < 0) {
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LOGE(TAG, "Couldn't find stream info!");
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return;
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}
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//get the audio stream index in the stream array
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int i = 0, audio_stream_idx = -1;
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for (; i < pFormatCtx->nb_streams; i++) {
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if (pFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
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audio_stream_idx = i;
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break;
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}
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}
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//find audio decoder
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AVCodecContext *codecCtx = pFormatCtx->streams[audio_stream_idx]->codec;
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AVCodec *codec = avcodec_find_decoder(codecCtx->codec_id);
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if (codec == NULL) {
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LOGE(TAG, "Couldn't find audio decoder!");
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return;
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}
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//open audio decoder
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if (avcodec_open2(codecCtx, codec, NULL) < 0) {
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LOGE(TAG, "Couldn't open audio decoder");
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return;
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}
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//malloc packet memory
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AVPacket *packet = (AVPacket *) av_malloc(sizeof(AVPacket));
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//malloc frame memory
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AVFrame *frame = av_frame_alloc();
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//frame->16bit 44100 PCM
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SwrContext *swrCtx = swr_alloc();
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//input sampleFormat
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enum AVSampleFormat in_sample_fmt = codecCtx->sample_fmt;
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//output sampleFormat: 16bit PCM
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enum AVSampleFormat out_sample_fmt = AV_SAMPLE_FMT_S16;
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//input sampleRate
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int in_sample_rate = codecCtx->sample_rate;
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//output sampleRate
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int out_sample_rate = in_sample_rate;
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//input channel layout(2 channels, stereo by default)
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uint64_t in_ch_layout = codecCtx->channel_layout;
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//output channel layout
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uint64_t out_ch_layout = AV_CH_LAYOUT_STEREO;
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swr_alloc_set_opts(swrCtx,
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out_ch_layout, out_sample_fmt, out_sample_rate,
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in_ch_layout, in_sample_fmt, in_sample_rate,
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0, NULL);
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swr_init(swrCtx);
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//output channel number
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int out_channel_nb = av_get_channel_layout_nb_channels(out_ch_layout);
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jclass player_class = env->GetObjectClass(thiz);
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if (!player_class) {
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LOGE(TAG, "player_class not found...");
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}
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//get AudioTrack by reflection
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jmethodID audio_track_method = env->GetMethodID(player_class, "createAudioTrack",
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"(II)Landroid/media/AudioTrack;");
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if (!audio_track_method) {
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LOGE(TAG, "audio_track_method not found...");
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}
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jobject audio_track = env->CallObjectMethod(thiz, audio_track_method, out_sample_rate,
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out_channel_nb);
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//call play method
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jclass audio_track_class = env->GetObjectClass(audio_track);
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jmethodID audio_track_play_mid = env->GetMethodID(audio_track_class, "play", "()V");
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env->CallVoidMethod(audio_track, audio_track_play_mid);
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//get write method
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jmethodID audio_track_write_mid = env->GetMethodID(audio_track_class, "write",
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"([BII)I");
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uint8_t *out_buffer = (uint8_t *) av_malloc(MAX_AUDIO_FRAME_SIZE);
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int got_frame = 0, ret = 0;
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//read audio frame
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while (av_read_frame(pFormatCtx, packet) >= 0) {
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//is audio stream index
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if (packet->stream_index == audio_stream_idx) {
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//do decode
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ret = avcodec_decode_audio4(codecCtx, frame, &got_frame, packet);
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if (ret < 0) {
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break;
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}
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//decode success
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if (got_frame > 0) {
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//convert audio format
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swr_convert(swrCtx, &out_buffer, MAX_AUDIO_FRAME_SIZE,
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(const uint8_t **) frame->data, frame->nb_samples);
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int out_buffer_size = av_samples_get_buffer_size(NULL, out_channel_nb,
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frame->nb_samples, out_sample_fmt,
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1);
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jbyteArray audio_sample_array = env->NewByteArray(out_buffer_size);
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jbyte *sample_byte_array = env->GetByteArrayElements(audio_sample_array, NULL);
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//copy buffer data
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memcpy(sample_byte_array, out_buffer, (size_t) out_buffer_size);
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//release byteArray
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env->ReleaseByteArrayElements(audio_sample_array, sample_byte_array, 0);
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//call write method to play
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env->CallIntMethod(audio_track, audio_track_write_mid,
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audio_sample_array, 0, out_buffer_size);
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//delete local reference
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env->DeleteLocalRef(audio_sample_array);
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usleep(1000 * 16);
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}
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}
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av_packet_unref(packet);
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}
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LOGI(TAG, "decode audio finish");
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av_packet_free(&packet);
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av_frame_free(&frame);
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av_free(out_buffer);
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swr_free(&swrCtx);
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avcodec_close(codecCtx);
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avformat_close_input(&pFormatCtx);
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env->ReleaseStringUTFChars(input_jstr, input_cstr);
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} |