ffmpeg将h264和aac合成ts，内存输入输出

在内存中读取h264视频和aac音频，在内存中输出ts

AVOutputFormat *ofmt = NULL;

//Input AVFormatContext and Output AVFormatContext

AVFormatContext *ifmt_ctx_v = NULL, *ifmt_ctx_a = NULL,*ofmt_ctx = NULL;

AVPacket pkt;

int ret, i;

int videoindex_v=-1,videoindex_out=-1;

int audioindex_a=-1,audioindex_out=-1;

int frame_index=0;

int64_t cur_pts_v=0,cur_pts_a=0;

AVDictionary* pAVDictionary = NULL;

AVInputFormat* ifmt = NULL;

av_register_all();

//Input

ifmt_ctx_v = avformat_alloc_context();

unsigned char * inH264=(unsigned char *)av_malloc(65535);

AVIOContext *vio =avio_alloc_context(inH264, 65535,0,this,fill_inH264,NULL,NULL);

ifmt_ctx_v->pb=vio;

int err = avformat_open_input(&ifmt_ctx_v, "nothing", NULL, NULL);

if (err != 0)

{

printf("\n");

printf("Call avformat_open_input function failed!\n");

return ;

}

if ((ret = avformat_find_stream_info(ifmt_ctx_v, 0)) < 0) {

printf( "Failed to retrieve input stream information");

goto end;

}

ifmt_ctx_a = avformat_alloc_context();

unsigned char * inAac=(unsigned char *)av_malloc(4096);

AVIOContext *aio =avio_alloc_context(inAac, 4096,0,this,fill_inAac,NULL,NULL);

ifmt_ctx_a->pb=aio;

err = avformat_open_input(&ifmt_ctx_a, "nothing", NULL, NULL);

if (err != 0)

{

printf("\n");

printf("Call avformat_open_input function failed!\n");

return ;

}

if ((ret = avformat_find_stream_info(ifmt_ctx_a, 0)) < 0) {

printf( "Failed to retrieve input stream information");

goto end;

}

avformat_alloc_output_context2(&ofmt_ctx, NULL, "mpegts", NULL);

unsigned char* outbuffer=(unsigned char*)av_malloc(65535);

AVIOContext *avio_out =avio_alloc_context(outbuffer, 65535,0,this,NULL,write_buffer,NULL);

ofmt_ctx->pb=avio_out;

ofmt_ctx->flags=AVFMT_FLAG_CUSTOM_IO;

//Output

//avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, out_filename);

if (!ofmt_ctx) {

printf( "Could not create output context\n");

ret = AVERROR_UNKNOWN;

goto end;

}

//注意循环次数

for (i = 0; i < ifmt_ctx_v->nb_streams; i++) {

//Create output AVStream according to input AVStream

if(ifmt_ctx_v->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO){

AVStream *in_stream = ifmt_ctx_v->streams[i];

AVRational rational;

rational.den = 1;

rational.num = 15;

in_stream->r_frame_rate = rational;

AVStream *out_stream = avformat_new_stream(ofmt_ctx, in_stream->codec->codec);

videoindex_v=i;

if (!out_stream) {

printf( "Failed allocating output stream\n");

ret = AVERROR_UNKNOWN;

goto end;

}

videoindex_out=out_stream->index;

AVCodecContext* c;

c = out_stream->codec;

c->bit_rate = 384000;

c->width = 1080;

c->height = 720;

c->time_base.num = 1;

c->time_base.den = 15;

//Copy the settings of AVCodecContext

if (avcodec_copy_context(out_stream->codec, in_stream->codec) < 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->oformat->flags & AVFMT_GLOBALHEADER)

out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;

break;

}

}

for (i = 0; i < ifmt_ctx_a->nb_streams; i++) {

//Create output AVStream according to input AVStream

if(ifmt_ctx_a->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO){

AVStream *in_stream = ifmt_ctx_a->streams[i];

AVRational rational;

rational.den = 1;

rational.num = 15;

in_stream->r_frame_rate = rational;

AVStream *out_stream = avformat_new_stream(ofmt_ctx, in_stream->codec->codec);

audioindex_a=i;

if (!out_stream) {

printf( "Failed allocating output stream\n");

ret = AVERROR_UNKNOWN;

goto end;

}

audioindex_out=out_stream->index;

//Copy the settings of AVCodecContext

if (avcodec_copy_context(out_stream->codec, in_stream->codec) < 0) {

printf( "Failed to copy context from input to output stream codec context\n");

goto end;

}

AVCodecContext* c;

c = out_stream->codec;

c->sample_fmt = AV_SAMPLE_FMT_S16;

c->bit_rate = 16000;

c->sample_rate = 8000;

c->channels = AV_CH_LAYOUT_MONO;

c->time_base.num = 1;

c->time_base.den = 15;

out_stream->codec->codec_tag = 0;

if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)

out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;

break;

}

}

//Write file header

if (avformat_write_header(ofmt_ctx, NULL) < 0) {

printf( "Error occurred when opening output file\n");

goto end;

}

while (1) {

AVFormatContext *ifmt_ctx;

int stream_index=0;

AVStream *in_stream, *out_stream;

//Get an AVPacket

if(av_compare_ts(cur_pts_v,ifmt_ctx_v->streams[videoindex_v]->time_base,cur_pts_a,ifmt_ctx_a->streams[audioindex_a]->time_base) <= 0){

ifmt_ctx=ifmt_ctx_v;

stream_index=videoindex_out;

if(av_read_frame(ifmt_ctx, &pkt) >= 0){

do{

in_stream = ifmt_ctx->streams[pkt.stream_index];

out_stream = ofmt_ctx->streams[stream_index];

if(pkt.stream_index==videoindex_v){

//FIX：No PTS (Example: Raw H.264)

//Simple Write PTS

if(pkt.pts==AV_NOPTS_VALUE){

//Write PTS

AVRational time_base1=in_stream->time_base;

//Duration between 2 frames (us)

int64_t calc_duration=(double)AV_TIME_BASE/av_q2d(in_stream->r_frame_rate);

//Parameters

pkt.pts=(double)(frame_index*calc_duration)/(double)(av_q2d(time_base1)*AV_TIME_BASE);

pkt.dts=pkt.pts;

pkt.duration=(double)calc_duration/(double)(av_q2d(time_base1)*AV_TIME_BASE);

frame_index++;

}

cur_pts_v=pkt.pts;

break;

}

}while(av_read_frame(ifmt_ctx, &pkt) >= 0);

}else{

break;

}

}else{

ifmt_ctx=ifmt_ctx_a;

stream_index=audioindex_out;

if(av_read_frame(ifmt_ctx, &pkt) >= 0){

do{

in_stream = ifmt_ctx->streams[pkt.stream_index];

out_stream = ofmt_ctx->streams[stream_index];

if(pkt.stream_index==audioindex_a){

//FIX：No PTS

//Simple Write PTS

if(pkt.pts==AV_NOPTS_VALUE){

//Write PTS

AVRational time_base1=in_stream->time_base;

//Duration between 2 frames (us)

int64_t calc_duration=(double)AV_TIME_BASE/av_q2d(in_stream->r_frame_rate);

//Parameters

pkt.pts=(double)(frame_index*calc_duration)/(double)(av_q2d(time_base1)*AV_TIME_BASE);

pkt.dts=pkt.pts;

pkt.duration=(double)calc_duration/(double)(av_q2d(time_base1)*AV_TIME_BASE);

frame_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, (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, (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;

pkt.stream_index=stream_index;

//printf("Write 1 Packet. size:%5d\tpts:%lld\n",pkt.size,pkt.pts);

//Write

if (av_interleaved_write_frame(ofmt_ctx, &pkt) < 0) {

printf( "Error muxing packet\n");

break;

}

av_free_packet(&pkt);

}

//Write file trailer

av_write_trailer(ofmt_ctx);

end:

ifmt_ctx_v->pb->opaque = NULL;

ifmt_ctx_a->pb->opaque = NULL;

avio_close(ifmt_ctx_v->pb);

avio_close(ifmt_ctx_a->pb);

avformat_close_input(&ifmt_ctx_v);

avformat_close_input(&ifmt_ctx_a);

/* close output */

ofmt_ctx->pb->opaque = NULL;

if (ofmt_ctx && !(ofmt_ctx->oformat->flags & AVFMT_NOFILE))

avio_close(ofmt_ctx->pb);

avformat_free_context(ofmt_ctx);

if (ret < 0 && ret != AVERROR_EOF) {

printf( "Error occurred.\n");

}