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tutorial08.c
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tutorial08.c
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#include <stdio.h>
#include <libavformat/avformat.h>
#include <libavutil/mathematics.h>
#include <libavutil/time.h>
#include <libavcodec/avcodec.h>
// gcc -Wall -g tutorial08.c -o bin/tutorial08.out -pthread -L/usr/local/lib -lavformat -lavcodec -lswresample -lswscale -lavutil -lm -lSDL -lm
int main(int argc, char* argv[])
{
AVOutputFormat *ofmt = NULL;
//输入对应一个AVFormatContext，输出对应一个AVFormatContext
//（Input AVFormatContext and Output AVFormatContext）
AVFormatContext *ifmt_ctx_a = NULL, *ifmt_ctx_v = NULL, *ifmt_ctx,
*ofmt_ctx[2];
AVPacket pkt,pkt1;
const char *in_filename_a, *in_filename_v,
*out_filename_a, *out_filename_v;
int ret, i;
int videoindex=-1, audioindex=-1;
int vframe_index=0, aframe_index = 0, index = 0;
int64_t start_time=0;
int64_t cur_pts_v=0, cur_pts_a=0;
in_filename_v = "./video.h264"; // 输入视频文件
in_filename_a = "./audio.aac"; // 输入音频文件
out_filename_v = "rtp://233.233.233.223:6666"; // 视频端口
out_filename_a = "rtp://233.233.233.223:6668"; // 音频端口
av_register_all();
//Network
avformat_network_init();
//视频输入结构体初始化
if ((ret = avformat_open_input(&ifmt_ctx_v, in_filename_v, 0, 0)) < 0) {
printf( "Could not open input file");
goto end;
}
if ((ret = avformat_find_stream_info(ifmt_ctx_v, 0)) < 0) {
printf( "Failed to retrieve input stream information ret = %ld", ret);
goto end;
}
//音频输入结构体初始化
if ((ret = avformat_open_input(&ifmt_ctx_a, in_filename_a, 0, 0)) < 0) {
printf( "Could not open input file.");
goto end;
}
if ((ret = avformat_find_stream_info(ifmt_ctx_a, 0)) < 0) {
printf( "Failed to retrieve input stream information");
goto end;
}
/**********打印输入文件信息**********/
av_dump_format(ifmt_ctx_v, 0, in_filename_v, 0);
av_dump_format(ifmt_ctx_a, 1, in_filename_a, 0);
/************************************/
//rtp输出结构体初始化
avformat_alloc_output_context2(ofmt_ctx, NULL, "rtp_mpegts", NULL);
avformat_alloc_output_context2(ofmt_ctx+1, NULL, "rtp_mpegts", NULL);
if (!ofmt_ctx) {
printf( "Could not create output context\n");
ret = AVERROR_UNKNOWN;
goto end;
}
// 视频部分
for (i = 0; i < ifmt_ctx_v->nb_streams; i++) {
// 根据输入流创建输出流
AVStream *in_stream = ifmt_ctx_v->streams[i];
AVStream *out_stream = avformat_new_stream(ofmt_ctx[0], in_stream->codec->codec);
if (!out_stream) {
printf( "Failed allocating output stream\n");
ret = AVERROR_UNKNOWN;
goto end;
}
// 复制AVCodecContext的设置
ret = avcodec_copy_context(out_stream->codec, in_stream->codec);
if (ret < 0) {
printf( "Failed to copy context from input to output stream codec context\n");
goto end;
}
out_stream->codec->codec_tag = 0;
if (ofmt_ctx[0]->oformat->flags & AVFMT_GLOBALHEADER)
out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
}
// 音频部分
for (i = 0; i < ifmt_ctx_a->nb_streams; i++) {
// 根据输入流创建输出流
AVStream *in_stream = ifmt_ctx_a->streams[i];
AVStream *out_stream = avformat_new_stream(ofmt_ctx[1], in_stream->codec->codec);
if (!out_stream) {
printf( "Failed allocating output stream\n");
ret = AVERROR_UNKNOWN;
goto end;
}
// 复制AVCodecContext的设置
ret = avcodec_copy_context(out_stream->codec, in_stream->codec);
if (ret < 0) {
printf( "Failed to copy context from input to output stream codec context\n");
goto end;
}
out_stream->codec->codec_tag = 0;
if (ofmt_ctx[1]->oformat->flags & AVFMT_GLOBALHEADER)
out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
}
// 打印输出的信息格式
av_dump_format(ofmt_ctx[0], 0, out_filename_v, 1);
av_dump_format(ofmt_ctx[1], 1, out_filename_a, 1);
// 打开输出URL（Open output URL）
if (!((*ofmt_ctx)->oformat->flags & AVFMT_NOFILE)) {
ret = avio_open(&(ofmt_ctx[0])->pb, out_filename_v, AVIO_FLAG_WRITE);
if (ret < 0) {
printf( "Could not open output URL '%s'", out_filename_v);
goto end;
}
}
if (!((*ofmt_ctx)->oformat->flags & AVFMT_NOFILE)) {
ret = avio_open(&(ofmt_ctx[1])->pb, out_filename_a, AVIO_FLAG_WRITE);
if (ret < 0) {
printf( "Could not open output URL '%s'", out_filename_a);
goto end;
}
}
// 写文件头（Write file header）
ret= avformat_write_header(ofmt_ctx[0], NULL);
ret= avformat_write_header(ofmt_ctx[1], NULL);
if (ret < 0) {
printf( "Error occurred when opening output URL\n");
goto end;
}
start_time=av_gettime();
while (1) {
AVStream *in_stream, *out_stream;
videoindex = 0;
audioindex = 0;
//Get an AVPacket
if(av_compare_ts(cur_pts_v,ifmt_ctx_v->streams[0]->time_base,cur_pts_a,ifmt_ctx_a->streams[0]->time_base) <= 0){
ifmt_ctx=ifmt_ctx_v;
index = 0;
if(av_read_frame(ifmt_ctx, &pkt) >= 0){
do{
in_stream = ifmt_ctx->streams[0];
out_stream = ofmt_ctx[index]->streams[0];
if(pkt.stream_index==index){
AVRational time_base = in_stream->time_base;//{ 1, 1000 };
AVRational r_framerate1 = in_stream->r_frame_rate;
AVRational time_base_q = { 1, AV_TIME_BASE };
//Duration between 2 frames (us)
int64_t calc_duration = (double)(AV_TIME_BASE) / av_q2d(r_framerate1); //内部时间戳
pkt.pts = av_rescale_q(vframe_index*calc_duration, time_base_q, time_base);
pkt.dts = pkt.pts;
pkt.duration = av_rescale_q(calc_duration, time_base_q, time_base);
pkt.pos = -1;
vframe_index++;
cur_pts_v=pkt.pts;
//发送延时Important:Delay
{
AVRational time_base=ifmt_ctx->streams[index]->time_base;
AVRational time_base_q={1,AV_TIME_BASE};
int64_t pts_time = av_rescale_q(pkt.dts, time_base, time_base_q);
int64_t now_time = av_gettime() - start_time;
if (pts_time > now_time)
av_usleep(pts_time - now_time);
}
break;
}
}while(av_read_frame(ifmt_ctx, &pkt) >= 0);
}
else{
break;
}
}
else{
ifmt_ctx=ifmt_ctx_a;
index = 1;
if(av_read_frame(ifmt_ctx, &pkt) >= 0){
do{
in_stream = ifmt_ctx->streams[0];
out_stream = ofmt_ctx[index]->streams[0];
if(pkt.stream_index==0){
//FIX：No PTS
//Simple Write PTS
AVRational time_base1=in_stream->time_base;
AVRational time_base_q = { 1, AV_TIME_BASE };
double frame_size = (double)in_stream->codec->frame_size;
double sample_rate = (double)in_stream->codec->sample_rate;
//Duration between 2 frames (us)
int64_t calc_duration=(double)(AV_TIME_BASE) * (frame_size/sample_rate);
pkt.pts = av_rescale_q(aframe_index*calc_duration, time_base_q, time_base1);
pkt.dts = pkt.pts;
pkt.duration = av_rescale_q(calc_duration, time_base_q, time_base1);
pkt.pos = -1;
aframe_index++;
cur_pts_a=pkt.pts;
break;
}
}while(av_read_frame(ifmt_ctx, &pkt) >= 0);
}else{
break;
}
}
//Convert PTS/DTS
pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, (enum AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, (enum AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base);
pkt.pos = -1;
if(index == 0)
printf("Write video Packet. size:%5d\tpts:%lld\n",pkt.size,pkt.pts);
if(index == 1)
printf("Write audio Packet. size:%5d\tpts:%lld\n",pkt.size,pkt.pts);
if (av_interleaved_write_frame(ofmt_ctx[index], &pkt) < 0) {
printf( "Error muxing packet\n");
break;
}
av_free_packet(&pkt);
}
//写文件尾（Write file trailer）
av_write_trailer(ofmt_ctx[0]);
av_write_trailer(ofmt_ctx[1]);
end:
//avformat_close_input(&ifmt_ctx_v);
avformat_close_input(&ifmt_ctx_a);
/* close output */
if (ofmt_ctx[0] && !(ofmt_ctx[0]->oformat->flags & AVFMT_NOFILE))
avio_close((ofmt_ctx[0])->pb);
avformat_free_context(ofmt_ctx[0]);
if (ofmt_ctx[1] && !(ofmt_ctx[1]->oformat->flags & AVFMT_NOFILE))
avio_close((ofmt_ctx[1])->pb);
avformat_free_context(ofmt_ctx[1]);
if (ret < 0 && ret != AVERROR_EOF) {
printf( "Error occurred.\n");
return -1;
}
return 0;
}