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translate the note pusher into English

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translate the note pusher into English
pull/166/head
xufulong 5 years ago
parent d920f7974f
commit 781ec7444e
1 changed files with 122 additions and 132 deletions
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  1. 254
      app/src/main/cpp/ffmpeg_pusher.cpp

254
app/src/main/cpp/ffmpeg_pusher.cpp
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@ -19,157 +19,147 @@ extern "C" {
PUSHER_FUNC(jint, pushStream, jstring filePath, jstring liveUrl) { PUSHER_FUNC(jint, pushStream, jstring filePath, jstring liveUrl) {
AVOutputFormat *output_format = NULL; AVOutputFormat *output_format = NULL;
AVFormatContext *in_format = NULL, *out_format = NULL; AVFormatContext *in_format = NULL, *out_format = NULL;
AVPacket packet; AVPacket packet;
const char *file_path, *live_url; const char *file_path, *live_url;
int video_index = -1; int video_index = -1;
int ret = 0, i; int ret = 0, i;
int frame_index = 0; int frame_index = 0;
int64_t start_time = 0; int64_t start_time = 0;
file_path = env->GetStringUTFChars(filePath, NULL); file_path = env->GetStringUTFChars(filePath, NULL);
live_url = env->GetStringUTFChars(liveUrl, NULL); live_url = env->GetStringUTFChars(liveUrl, NULL);
LOGE(TAG, "file_path=%s", file_path); LOGE(TAG, "file_path=%s", file_path);
LOGE(TAG, "live_url=%s", live_url); LOGE(TAG, "live_url=%s", live_url);
//注册所有组件 av_register_all();
av_register_all(); avformat_network_init();
//初始化网络 if ((ret = avformat_open_input(&in_format, file_path, 0, 0)) < 0) {
avformat_network_init(); LOGE(TAG, "could not open input file...");
//打开输入文件 goto end;
if((ret = avformat_open_input(&in_format, file_path, 0, 0)) < 0){ }
LOGE(TAG, "could not open input file..."); if ((ret = avformat_find_stream_info(in_format, 0)) < 0) {
LOGE(TAG, "could not find stream info...");
goto end;
}
for (i = 0; i < in_format->nb_streams; i++) {
if (in_format->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
video_index = i;
break;
}
}
av_dump_format(in_format, 0, file_path, 0);
avformat_alloc_output_context2(&out_format, NULL, "flv", live_url);
if (!out_format) {
LOGE(TAG, "could not alloc output context...");
ret = AVERROR_UNKNOWN;
goto end;
}
//Create output stream according to input stream
for (i = 0; i < in_format->nb_streams; i++) {
AVStream *in_stream = in_format->streams[i];
AVStream *out_stream = avformat_new_stream(out_format, in_stream->codec->codec);
if (!out_stream) {
LOGE(TAG, "could not alloc output stream...");
ret = AVERROR_UNKNOWN;
goto end; goto end;
} }
//寻找流信息 //Copy context
if((ret = avformat_find_stream_info(in_format, 0)) < 0){ ret = avcodec_copy_context(out_stream->codec, in_stream->codec);
LOGE(TAG, "could not find stream info..."); if (ret < 0) {
LOGE(TAG, "could not copy context...");
goto end; goto end;
} }
// out_stream->codec->codec_tag = 0;
for(i=0; i<in_format->nb_streams; i++){ if (out_format->oformat->flags & AVFMT_GLOBALHEADER) {
//找到视频流 out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
if(in_format->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO){
video_index = i;
break;
}
} }
av_dump_format(in_format, 0, file_path, 0); }
//分配输出封装格式上下文， rtmp协议支持格式为flv output_format = out_format->oformat;
avformat_alloc_output_context2(&out_format, NULL, "flv", live_url); if (!(output_format->flags & AVFMT_NOFILE)) {
if(!out_format){ ret = avio_open(&out_format->pb, live_url, AVIO_FLAG_WRITE);
LOGE(TAG, "could not alloc output context..."); if (ret < 0) {
ret = AVERROR_UNKNOWN; LOGE(TAG, "could not open output url '%s'", live_url);
goto end; goto end;
} }
//根据输入流来创建输出流 }
for(i=0; i<in_format->nb_streams; i++){ //Write header
AVStream *in_stream = in_format->streams[i]; ret = avformat_write_header(out_format, NULL);
AVStream *out_stream = avformat_new_stream(out_format, in_stream->codec->codec); if (ret < 0) {
if(!out_stream){ LOGE(TAG, "could not write header...");
LOGE(TAG, "could not alloc output stream..."); goto end;
ret = AVERROR_UNKNOWN; }
goto end; start_time = av_gettime();
} while (1) {
//复制封装格式上下文 AVStream *in_stream, *out_stream;
ret = avcodec_copy_context(out_stream->codec, in_stream->codec); ret = av_read_frame(in_format, &packet);
if(ret < 0){ if (ret < 0) {
LOGE(TAG, "could not copy context..."); break;
goto end;
}
out_stream->codec->codec_tag = 0;
if(out_format->oformat->flags & AVFMT_GLOBALHEADER){
out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
}
}
//封装格式
output_format = out_format->oformat;
//打开输出文件/URL
if(!(output_format->flags & AVFMT_NOFILE)){
ret = avio_open(&out_format->pb, live_url, AVIO_FLAG_WRITE);
if(ret < 0){
LOGE(TAG, "could not open output url '%s'", live_url);
goto end;
}
} }
//写文件头 //计算帧间隔，参考时钟/采样率
ret = avformat_write_header(out_format, NULL); if (packet.pts == AV_NOPTS_VALUE) {
if(ret < 0){ AVRational time_base = in_format->streams[video_index]->time_base;
LOGE(TAG, "could not write header..."); int64_t cal_duration = (int64_t) (AV_TIME_BASE /
goto end; av_q2d(in_format->streams[video_index]->r_frame_rate));
packet.pts = (int64_t) ((frame_index * cal_duration) /
(av_q2d(time_base) * AV_TIME_BASE));
packet.dts = packet.pts;
packet.duration = (int64_t) (cal_duration / (av_q2d(time_base) * AV_TIME_BASE));
} }
//获取开始时间 if (packet.stream_index == video_index) {
start_time = av_gettime(); AVRational time_base = in_format->streams[video_index]->time_base;
//开始循环读一帧数据 AVRational time_base_q = {1, AV_TIME_BASE};
while (1){ int64_t pts_time = av_rescale_q(packet.dts, time_base, time_base_q);
AVStream *in_stream, *out_stream; int64_t now_time = av_gettime() - start_time;
ret = av_read_frame(in_format, &packet); //sleep to keep waiting
if(ret < 0){ if (pts_time > now_time) {
break; av_usleep((unsigned int) (pts_time - now_time));
}
//计算帧间隔，参考时钟/采样率
if(packet.pts == AV_NOPTS_VALUE){
AVRational time_base = in_format->streams[video_index]->time_base;
int64_t cal_duration = (int64_t)(AV_TIME_BASE/av_q2d(in_format->streams[video_index]->r_frame_rate));
packet.pts = (int64_t)((frame_index * cal_duration)/(av_q2d(time_base) * AV_TIME_BASE));
packet.dts = packet.pts;
packet.duration = (int64_t)(cal_duration/(av_q2d(time_base) * AV_TIME_BASE));
} }
//视频帧之间延时 }
if(packet.stream_index == video_index){ in_stream = in_format->streams[packet.stream_index];
AVRational time_base = in_format->streams[video_index]->time_base; out_stream = out_format->streams[packet.stream_index];
AVRational time_base_q = {1, AV_TIME_BASE};
int64_t pts_time = av_rescale_q(packet.dts, time_base, time_base_q);
int64_t now_time = av_gettime() - start_time;
//延时以保持同步
if(pts_time > now_time){
av_usleep((unsigned int)(pts_time - now_time));
}
}
in_stream = in_format->streams[packet.stream_index];
out_stream = out_format->streams[packet.stream_index];
//pts/dts转换 //pts to dts
packet.pts = av_rescale_q_rnd(packet.pts, in_stream->time_base, out_stream->time_base, packet.pts = av_rescale_q_rnd(packet.pts, in_stream->time_base, out_stream->time_base,
(AVRounding)(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX)); (AVRounding) (AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
packet.dts = av_rescale_q_rnd(packet.dts, in_stream->time_base, out_stream->time_base, packet.dts = av_rescale_q_rnd(packet.dts, in_stream->time_base, out_stream->time_base,
(AVRounding)(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX)); (AVRounding) (AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
packet.duration = av_rescale_q(packet.duration, in_stream->time_base, out_stream->time_base); packet.duration = av_rescale_q(packet.duration, in_stream->time_base,
packet.pos = -1; out_stream->time_base);
packet.pos = -1;
//视频帧计数 if (packet.stream_index == video_index) {
if(packet.stream_index == video_index){ frame_index++;
frame_index ++; LOGI(TAG, "write frame = %d", frame_index);
LOGI(TAG, "write frame = %d", frame_index); }
} //Write a frame
//写一帧数据 ret = av_interleaved_write_frame(out_format, &packet);
ret = av_interleaved_write_frame(out_format, &packet); if (ret < 0) {
if(ret < 0){ LOGE(TAG, "could not write frame...");
LOGE(TAG, "could not write frame..."); break;
break;
}
//释放包数据内存
av_packet_unref(&packet);
} }
//写文件尾 //Release packet
av_write_trailer(out_format); av_packet_unref(&packet);
}
//Write tail
av_write_trailer(out_format);
end: end:
avformat_close_input(&in_format); avformat_close_input(&in_format);
if(out_format && !(out_format->flags & AVFMT_NOFILE)){ if (out_format && !(out_format->flags & AVFMT_NOFILE)) {
avio_close(out_format->pb); avio_close(out_format->pb);
} }
avformat_free_context(in_format); avformat_free_context(in_format);
avformat_free_context(out_format); avformat_free_context(out_format);
env->ReleaseStringUTFChars(filePath, file_path); env->ReleaseStringUTFChars(filePath, file_path);
env->ReleaseStringUTFChars(liveUrl, live_url); env->ReleaseStringUTFChars(liveUrl, live_url);
if(ret < 0 && ret != AVERROR_EOF){ if (ret < 0 && ret != AVERROR_EOF) {
return -1; return -1;
}
return 0;
} }
return 0;
}
#ifdef __cplusplus #ifdef __cplusplus
} }

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