iOS ffmpeg将音视频写入文件aac+h264
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#define STREAM_DURATION 5.0#define STREAM_FRAME_RATE 25 /* 25 images/s */#define STREAM_NB_FRAMES ((int)(STREAM_DURATION * STREAM_FRAME_RATE))#define STREAM_PIX_FMT PIX_FMT_YUV420P /* default pix_fmt */#undef NO_DATA#define NO_DATA 0#define HAS_DATA 1#define STREAM_DURATION 5.0#define STREAM_FRAME_RATE 25 /* 25 images/s */#define STREAM_NB_FRAMES ((int)(STREAM_DURATION * STREAM_FRAME_RATE))#define STREAM_PIX_FMT PIX_FMT_YUV420P /* default pix_fmt */float t, tincr, tincr2;int16_t *samples;uint8_t *audio_outbuf;int audio_outbuf_size;int audio_input_frame_size;AVFormatContext *oc;AVStream *audio_st0, *video_st0;static AVStream *add_audio_stream(AVFormatContext *oc, int codec_id){ AVCodecContext *c; AVStream *st; /////////////////////////////////////////////// AVCodec *codec; codec = avcodec_find_encoder(AV_CODEC_ID_AAC); if(NULL == codec) { printf("没有找到合适的编码器！\n"); } st = avformat_new_stream(oc, codec); if (st==NULL) { printf("输出文件打开失败！\n"); } c = st->codec; c->codec = codec; c->codec_id = AV_CODEC_ID_AAC; c->codec_type = AVMEDIA_TYPE_AUDIO; c->sample_fmt = AV_SAMPLE_FMT_S16; c->sample_rate= 44100; c->channel_layout=AV_CH_LAYOUT_STEREO; c->channels = /*av_get_channel_layout_nb_channels(audioCodecCtx->channel_layout)*/2; c->bit_rate = 16000; c->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL; codec->profiles = FF_PROFILE_AAC_MAIN; int a[]= {AV_SAMPLE_FMT_S16}; codec->sample_fmts = a; return st;}static void make_dsi( unsigned int sampling_frequency_index, unsigned int channel_configuration, char* dsi ){ unsigned int object_type = 2; // AAC LC by default dsi[0] = (object_type<<3) | (sampling_frequency_index>>1); dsi[1] = ((sampling_frequency_index&1)<<7) | (channel_configuration<<3);}static int get_sr_index(unsigned int sampling_frequency){ switch (sampling_frequency) { case 96000: return 0; case 88200: return 1; case 64000: return 2; case 48000: return 3; case 44100: return 4; case 32000: return 5; case 24000: return 6; case 22050: return 7; case 16000: return 8; case 12000: return 9; case 11025: return 10; case 8000: return 11; case 7350: return 12; default: return 0; }}static void open_audio(AVFormatContext *oc, AVStream *st){ AVCodecContext *c; c = st->codec; // char dsi[2] = {0};// make_dsi( (unsigned int)get_sr_index( (unsigned int)44100 ), (unsigned int)2, dsi);// c->extradata = (uint8_t*)dsi;// c->extradata_size = 2;// if (oc->oformat->flags & AVFMT_GLOBALHEADER)// // c->flags |= CODEC_FLAG_GLOBAL_HEADER; /* open it */ if ( avcodec_open2(c, st->codec->codec, NULL) < 0) { fprintf(stderr, "could not open audio codec\n"); } }static void write_audio_frame(AVFormatContext *oc, AVStream *st, void *audioBuffer, int bufferSize, double pts){ AVCodecContext *c; AVPacket pkt; av_init_packet(&pkt); c = st->codec; if (c->coded_frame->pts != AV_NOPTS_VALUE) pkt.pts= av_rescale_q(c->coded_frame->pts, c->time_base, st->time_base); // if(c->coded_frame->key_frame) pkt.flags |= AV_PKT_FLAG_KEY; pkt.stream_index= st->index; pkt.data = audioBuffer; pkt.size = bufferSize; /* write the compressed frame in the media file */ if (av_write_frame(oc, &pkt) != 0) //av_interleaved_write_frame { fprintf(stderr, "Error while writing audio frame\n"); }else { NSLog(@"write_audio_frame"); }}static void close_audio(AVFormatContext *oc, AVStream *st){ avcodec_close(st->codec);}/**************************************************************//* video output */AVFrame *picture, *tmp_picture;uint8_t *video_outbuf;int frame_count, video_outbuf_size;/* add a video output stream */static AVStream *add_video_stream(AVFormatContext *oc, int codec_id){ AVCodecContext *c; AVStream *st; AVCodec *codec; codec = avcodec_find_encoder(codec_id); if(NULL == codec) { NSLog(@"could not find video encoder"); } st = avformat_new_stream( oc, codec ); c = st->codec; c->codec = codec; c->me_range = 5;//16 c->max_qdiff = 1; c->qmin = 200; //10 c->qmax = 200; //51 c->qcompress = 0.5f; c->codec_id = codec_id; c->codec_type = AVMEDIA_TYPE_VIDEO; c->bit_rate = 512000;// c->width = 480; c->height = 640; // videoCodecCtx->gop_size = 100; //用于帧间压缩时，比如12，是指12个图片的帧间预测 if (codec_id == AV_CODEC_ID_MPEG4) { c->pix_fmt = PIX_FMT_YUV420P; //像素格式，表示屏幕的显示方式 }else { c->pix_fmt = PIX_FMT_YUVJ420P; // PIX_FMT_YUVJ420P //像素格式，表示屏幕的显示方式 // videoCodecCtx->pix_fmt = PIX_FMT_YUV420P; } c->time_base.den = 15; c->time_base.num = 1; c->max_b_frames = 0; c->idct_algo = FF_IDCT_ARM; // if(!strcmp(oc->oformat->name, "mp4") || !strcmp(oc->oformat->name, "mov") || !strcmp(oc->oformat->name, "3gp")) c->flags |= CODEC_FLAG_GLOBAL_HEADER; return st;}static void open_video(AVFormatContext *oc, AVStream *st){ AVCodecContext *c; c = st->codec; /* open the codec */ if (avcodec_open2(c,st->codec->codec ,NULL) < 0) { fprintf(stderr, "could not open video codec\n"); } }double timeStamp = 0;static void write_video_frame(AVFormatContext *oc, AVStream *st, void *videoBuffer, int bufferSize, int pts){ int ret; AVCodecContext *c; c = st->codec; AVPacket pkt; av_init_packet(&pkt); // if (c->coded_frame->pts != AV_NOPTS_VALUE)// pkt.pts= av_rescale_q(c->coded_frame->pts, c->time_base, st->time_base); pkt.pts = (double)st->pts.val * (1.0f/15.0f)+pts;//输出视频时间戳// pkt.dts = 0; // if(c->coded_frame->key_frame) pkt.flags |= AV_PKT_FLAG_KEY; pkt.stream_index= st->index; pkt.data= videoBuffer; pkt.size= bufferSize; /* write the compressed frame in the media file */ ret = av_write_frame(oc, &pkt); if (ret != 0) { fprintf(stderr, "Error while writing video frame\n"); }else { NSLog(@"write_video_frame"); }}static void close_video(AVFormatContext *oc, AVStream *st){ avcodec_close(st->codec);}static void startR(){ const char *filename; AVOutputFormat *fmt; /* initialize libavcodec, and register all codecs and formats */ // avcodec_register_all(); av_register_all(); NSString *videoName = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES) objectAtIndex:0]; //下面的在录像的时候初始化 NSString *str = [videoName stringByAppendingPathComponent:@"videos"]; videoName = [str stringByAppendingPathComponent:@"test.aac"]; filename = [videoName UTF8String]; /* auto detect the output format from the name. default is mp4. */ fmt =av_guess_format(NULL, filename, NULL); /* allocate the output media context */ oc = avformat_alloc_context(); if (!oc) { fprintf(stderr, "Memory error\n"); exit(1); } oc->oformat = fmt; fmt->audio_codec = AV_CODEC_ID_AAC; // fmt->video_codec = AV_CODEC_ID_H264; // snprintf(oc->filename, sizeof(oc->filename), "%s", filename); /* add the audio and video streams using the default format codecs and initialize the codecs */ video_st0 = NULL; audio_st0 = NULL; if (fmt->video_codec != CODEC_ID_NONE) { video_st0 = add_video_stream(oc, fmt->video_codec); } if (fmt->audio_codec != CODEC_ID_NONE) { audio_st0 = add_audio_stream(oc, fmt->audio_codec); } av_dump_format(oc, 0, filename, 1); /* now that all the parameters are set, we can open the audio and video codecs and allocate the necessary encode buffers */ if (video_st0) open_video(oc, video_st0); if (audio_st0) open_audio(oc, audio_st0); /* open the output file, if needed */ if (!(fmt->flags & AVFMT_NOFILE)) { if(avio_open(&oc->pb, filename, AVIO_FLAG_READ_WRITE)< 0) { NSLog(@"error open file"); return ; } } /* write the stream header, if any */// avformat_write_header(oc, NULL);// // for(;;) {// /* compute current audio and video time */// if (audio_st)// audio_pts = (double)audio_st->pts.val * audio_st->time_base.num / audio_st->time_base.den;// else// audio_pts = 0.0;// // if (video_st)// video_pts = (double)video_st->pts.val * video_st->time_base.num / video_st->time_base.den;// else// video_pts = 0.0;// // /* write interleaved audio and video frames */// if (!video_st || (video_st && audio_st && audio_pts < video_pts)) {// // write_audio_frame(oc, audio_st);// } else {// // write_video_frame(oc, video_st);// }// }// // /* write the trailer, if any. the trailer must be written// * before you close the CodecContexts open when you wrote the// * header; otherwise write_trailer may try to use memory that// * was freed on av_codec_close() */// av_write_trailer(oc);// // /* close each codec */// if (video_st)// close_video(oc, video_st);// if (audio_st)// close_audio(oc, audio_st);// // /* free the streams */// for(i = 0; i < oc->nb_streams; i++) {// av_freep(&oc->streams[i]->codec);// av_freep(&oc->streams[i]);// }// // av_free(oc);} 0 0
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