原文出自 http://blog.csdn.net/zxwangyun/article/details/8190638#reply 作者 Sloan
这里在录制时,并没有进行转码,只是相当于把rtsp视频直接保存到一个文件中。
- #include <stdio.h>
- #ifdef __cplusplus
- extern "C" {
- #endif
- #include <libavcodec/avcodec.h>
- #include <libavformat/avformat.h>
- //#include <libswscale/swscale.h>
- #ifdef _MSC_VER
- int strcasecmp( const char *s1, const char *s2)
- {
- while ((*s1 != '\0' )
- && (tolower(*(unsigned char *) s1) ==
- tolower(*(unsigned char *) s2)))
- {
- s1++;
- s2++;
- }
- return tolower(*(unsigned char *) s1) - tolower(*(unsigned char *) s2);
- }
- int strncasecmp( const char *s1, const char *s2, unsigned int n)
- {
- if (n == 0)
- return 0;
- while ((n-- != 0)
- && (tolower(*(unsigned char *) s1) ==
- tolower(*(unsigned char *) s2))) {
- if (n == 0 || *s1 == '\0' || *s2 == '\0' )
- return 0;
- s1++;
- s2++;
- }
- return tolower(*(unsigned char *) s1) - tolower(*(unsigned char *) s2);
- }
- #endif //_MSC_VER
- #ifdef __cplusplus
- }
- #endif
- /***********************************************************
- '** stream_component_open
- * Description:
- * //open the stream component for video/audio
- *
- *
- * Params:ic-pointer which contains the url and codec details
- :stream_index-index denoting video or audio stream
- ***********************************************************/
- int stream_component_open(AVFormatContext *ic, int stream_index)
- {
- AVCodecContext *enc;
- AVCodec *codec;
- if (stream_index < 0 || stream_index >= ( int )ic->nb_streams)
- return -1;
- enc = ic->streams[stream_index]->codec;
- /* prepare audio output */
- if (enc->codec_type == CODEC_TYPE_AUDIO)
- {
- if (enc->channels > 0)
- enc->request_channels = FFMIN(2, enc->channels);
- else
- enc->request_channels = 2;
- /*Hardcoding the codec id to PCM_MULAW if the audio
- codec id returned by the lib is CODEC_ID_NONE */
- if (enc->codec_id == CODEC_ID_NONE)
- {
- enc->codec_id = CODEC_ID_PCM_MULAW;
- enc->channels = 1;
- enc->sample_rate = 16000;
- enc->bit_rate = 128;
- }
- }
- codec = avcodec_find_decoder(enc->codec_id);
- enc->idct_algo = FF_IDCT_AUTO;
- enc->flags2 |= CODEC_FLAG2_FAST;
- enc->skip_frame = AVDISCARD_DEFAULT;
- enc->skip_idct = AVDISCARD_DEFAULT;
- enc->skip_loop_filter = AVDISCARD_DEFAULT;
- enc->error_concealment = 3;
- if (!codec || avcodec_open(enc, codec) < 0)
- return -1;
- avcodec_thread_init(enc, 1);
- enc->thread_count= 1;
- ic->streams[stream_index]->discard = AVDISCARD_DEFAULT;
- return 0;
- }
- //声明函数
- int enable_local_record(AVFormatContext *ic /*已经打开的视频文件上下文*/ ,
- int videostream, int audiostream,
- AVFormatContext **out_oc, const char * ofile, const char * ofileformat);
- int exit_onerr( const char * err_desc /*错误描述*/ , int err_code /*错误码*/ )
- {
- printf( "%s\n" ,err_desc);
- system( "pause" ); //暂停,查看错误描述
- return err_code;
- }
- int main( int argc, char * argv[])
- {
- //初始化ffmpeg链表结构
- avcodec_register_all(); // Register all formats and codecs
- av_register_all();
- AVPacket packet;
- //打开文件
- AVFormatContext * ic = NULL;
- const char * rtsp_url = "rtsp://192.168.0.168:8557/PSIA/Streaming/channels/2?videoCodecType=H.264" ;
- if (av_open_input_file(&ic, rtsp_url, NULL, 0, NULL)!=0)
- {
- return exit_onerr( "can't open file." ,-1);
- }
- if (!ic)
- {
- return exit_onerr( "unknow error." ,-2);
- }
- ic ->max_analyze_duration = 1000;
- //get streams information
- if (av_find_stream_info(ic)<0)
- {
- av_close_input_file(ic); //退出前,记得释放资源
- ic = NULL;
- return exit_onerr( "con't init streams information." ,-3);
- }
- //find stream
- int videoStream=-1; // Didn't find a video stream
- int audioStream=-1; // Didn't find a audio stream
- // Find the first video stream
- for ( int i=0; i<ic ->nb_streams; i++)
- {
- if ( ic ->streams[i]->codec->codec_type==CODEC_TYPE_VIDEO)
- {
- videoStream=i;
- break ;
- }
- }
- // Find the first audio stream
- for ( int i=0; i<ic ->nb_streams; i++)
- {
- if ( ic ->streams[i]->codec->codec_type==CODEC_TYPE_AUDIO)
- {
- audioStream=i;
- break ;
- }
- }
- //判断视频文件中是否包含音视频流,如果没有,退出
- if (audioStream<0 && videoStream<0)
- {
- av_close_input_file(ic); //退出前,记得释放资源
- ic = NULL;
- return exit_onerr( "con't find a audio stream or video stream" ,-4);
- }
- //open the stream component for video
- int videoComponent = -1;
- if (videoStream >= 0)
- {
- videoComponent = stream_component_open(ic, videoStream);
- if (videoComponent<0)
- {
- av_close_input_file(ic); //退出前,记得释放资源
- return exit_onerr( "not supported video stream" ,-5); //要求重新编译ffmpeg以支持该种编码格式
- }
- }
- //open the stream component for audio
- int audioComponent = -1;
- if (audioStream >= 0)
- {
- audioComponent = stream_component_open(ic, audioStream);
- if (audioComponent<0)
- {
- av_close_input_file(ic); //退出前,记得释放资源
- return exit_onerr( "not supported audio stream" ,-6); //要求重新编译ffmpeg以支持该种编码格式
- }
- }
- //////////////////////////////////////////////////////
- int ret = 0;
- //初始化并打开录像
- AVFormatContext * oc = NULL;
- const char * out_file_name = "D:\\test.avi" ;
- //获取一帧完整的图像用于初始化ffmpeg内部的一些结构体数据(这里使用什么数据尚未清楚,请自行查看),否则会出现写文件头失败
- int got_picture = 0;
- AVFrame *frame = avcodec_alloc_frame();
- while ( 1 )
- {
- if (av_read_frame( ic, &packet)<0)
- {
- av_free_packet(&packet);
- av_close_input_file(ic); //退出前,记得释放资源
- return exit_onerr( "read frame error." ,-7); //读取视频帧失败
- }
- if (packet.stream_index == videoStream)
- {
- avcodec_decode_video(ic->streams[videoStream]->codec, frame, &got_picture, packet.data, packet.size);
- }
- av_free_packet(&packet);
- if (got_picture)
- break ;
- }
- av_free(frame);
- ret = enable_local_record(ic,videoStream,audioStream,&oc,out_file_name, "avi" );
- if (ret <0 || !oc)
- {
- //退出前,记得释放资源,现在又多了个oc参数需要释放
- if (oc)
- {
- ///cleanup the output contents format
- for (unsigned int i=0;i< oc->nb_streams;i++)
- {
- av_metadata_free(&oc ->streams[i]->metadata);
- av_free(oc ->streams[i]->codec);
- av_free(oc ->streams[i]);
- }
- for (unsigned int i=0;i<oc ->nb_programs;i++)
- {
- av_metadata_free(&oc ->programs[i]->metadata);
- }
- for (unsigned int i=0;i<oc ->nb_chapters;i++)
- {
- av_metadata_free(&oc ->chapters[i]->metadata);
- }
- av_metadata_free(&oc ->metadata);
- av_free(oc);
- }
- av_close_input_file(ic);
- return exit_onerr( "can't init out file." ,-8);
- }
- //开始录像
- int video_dts = 0,audio_dts = 0; //时间戳
- int total_frame = 300; //写300帧文件
- while (total_frame--)
- {
- if ( av_read_frame( ic, &packet) <0 ) //read the packet
- {
- //读取数据出错
- av_free_packet(&packet);
- break ;
- }
- if (packet.data && (packet.stream_index == videoStream || packet.stream_index == audioStream) )
- {
- //计算时间视频戳,顺序+1,这里可以多研究几种编码的音视频文件,求其时间戳生成格式,h264编码顺序加1即可
- if (packet.stream_index == videoStream)
- {
- packet.dts = video_dts++;
- packet.pts = video_dts;
- }
- else if (packet.stream_index == audioStream) //计算音频时间戳
- {
- packet.dts = audio_dts++;
- packet.pts = audio_dts * (1000 * packet.size /ic ->streams[packet.stream_index]->codec ->sample_rate);
- }
- packet.flags |= PKT_FLAG_KEY;
- if (av_interleaved_write_frame(oc,&packet)<0)
- {
- printf( "st:%d\twrite frame failed.\n" ,packet.stream_index);
- }
- }
- av_free_packet(&packet);
- }
- //关闭录像文件和输入文件
- //写文件尾
- av_write_trailer(oc);
- /* close the output file if need.*/
- if (!(oc ->oformat->flags & AVFMT_NOFILE))
- {
- url_fclose(oc->pb);
- }
- //释放资源
- /*cleanup the output contents format*/
- for (unsigned int i=0;i< oc->nb_streams;i++)
- {
- av_metadata_free(&oc ->streams[i]->metadata);
- av_free(oc ->streams[i]->codec);
- av_free(oc ->streams[i]);
- }
- for (unsigned int i=0;i<oc ->nb_programs;i++)
- {
- av_metadata_free(&oc ->programs[i]->metadata);
- }
- for (unsigned int i=0;i<oc ->nb_chapters;i++)
- {
- av_metadata_free(&oc ->chapters[i]->metadata);
- }
- av_metadata_free(&oc ->metadata);
- av_free(oc);
- av_close_input_file(ic);
- return 0;
- }
- //初始化录像文件,代码较长,可写成函数
- /*
- *return <0 failed, 0 success
- */
- int enable_local_record(AVFormatContext *ic /*已经打开的视频文件上下文*/ , int videostream, int audiostream,AVFormatContext **out_oc, const char * ofile, const char * ofileformat)
- {
- AVFormatContext *oc = NULL; //
- AVOutputFormat *fmt = NULL;
- if ( ofileformat )
- {
- fmt = av_guess_format(ofileformat, NULL, NULL);
- }
- if (!fmt)
- {
- printf( "out file format \"%s\" invalidate.\n" ,ofileformat);
- return -1;
- }
- /*******************************************init output contents begin**********************************************************/
- /* allocate the output media context */
- oc = avformat_alloc_context();
- if (!oc)
- {
- printf( "out of memory.\n" );
- return -2; //内存分配失败
- }
- *out_oc = oc;
- oc ->oformat = fmt;
- sprintf_s( oc ->filename, sizeof ( oc ->filename), "%s" , ofile);
- av_metadata_conv(oc, fmt->metadata_conv, NULL);
- if ( videostream >=0 )
- {
- //AVCodecContext* pCodecCtx= ->streams[videostream]->codec;;
- //add video stream
- AVStream * st = av_new_stream(oc, videostream);
- if (!st)
- {
- printf( "can not add a video stream.\n" );
- return -3;
- }
- st->codec->codec_id = ic ->streams[videostream] ->codec->codec_id;
- st->codec->codec_type = CODEC_TYPE_VIDEO;
- st->codec->bit_rate = ic ->streams[videostream] ->codec->bit_rate;
- st->codec->width = ic ->streams[videostream] ->codec->width;
- st->codec->height = ic ->streams[videostream] ->codec->height;
- st->codec->gop_size = ic ->streams[videostream] ->codec->gop_size;
- st->codec->pix_fmt = ic ->streams[videostream] ->codec->pix_fmt;
- st->codec->frame_size = ic ->streams[videostream] ->codec->frame_size;
- st->codec->has_b_frames = ic ->streams[videostream] ->codec->has_b_frames;
- st->codec->extradata = ic ->streams[videostream] ->codec->extradata;
- st->codec->extradata_size = ic ->streams[videostream] ->codec->extradata_size;
- st->codec->codec_tag = ic ->streams[videostream] ->codec->codec_tag;
- st->codec->bits_per_raw_sample = ic ->streams[videostream] ->codec->bits_per_raw_sample;
- st->codec->chroma_sample_location = ic ->streams[videostream] ->codec->chroma_sample_location;
- st->time_base.den = ic ->streams[videostream] ->time_base.den;
- st->time_base.num = ic ->streams[videostream] ->time_base.num;
- st->cur_dts = ic ->streams[videostream] ->cur_dts;
- st->stream_copy = 1;
- st->pts.den = ic ->streams[videostream] ->time_base.den;
- st->pts.num = ic ->streams[videostream] ->time_base.num;
- if ( oc ->oformat->flags & AVFMT_GLOBALHEADER)
- st ->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
- if (av_q2d(ic ->streams[videostream] ->codec->time_base)*ic ->streams[videostream] ->codec->ticks_per_frame > av_q2d(ic ->streams[videostream]->time_base) &&
- av_q2d(ic ->streams[videostream]->time_base) < 1.0/1000)
- {
- st->codec->time_base = ic ->streams[videostream] ->codec->time_base;
- st->codec->time_base.num *= ic ->streams[videostream] ->codec->ticks_per_frame;
- }
- else
- {
- st->codec->time_base = ic ->streams[videostream] ->time_base;
- }
- st->disposition = ic ->streams[videostream] ->disposition;
- }
- if (audiostream >= 0 )
- {
- AVStream * st = av_new_stream( oc, audiostream);
- if (!st)
- {
- printf( "can not add a audio stream.\n" );
- return -4;
- }
- st->codec->codec_id = ic ->streams[audiostream] ->codec->codec_id;
- st->codec->codec_type = CODEC_TYPE_AUDIO;
- st->codec->bit_rate = ic ->streams[audiostream] ->codec->bit_rate;
- st->codec->gop_size = ic ->streams[audiostream] ->codec->gop_size;
- st->codec->pix_fmt = ic ->streams[audiostream] ->codec->pix_fmt;
- st->codec->bit_rate = ic ->streams[audiostream] ->codec->bit_rate;
- st->codec->channel_layout = ic ->streams[audiostream] ->codec->channel_layout;
- st->codec->frame_size = ic ->streams[audiostream] ->codec->frame_size;
- st->codec->sample_rate = ic ->streams[audiostream] ->codec->sample_rate;
- st->codec->channels = ic ->streams[audiostream] ->codec->channels;
- st->codec->block_align = ic ->streams[audiostream] ->codec->block_align;
- st->time_base.den = ic ->streams[audiostream] ->time_base.den;
- st->time_base.num = ic ->streams[audiostream] ->time_base.num;
- st->stream_copy = 1;
- st->pts.den = ic ->streams[audiostream] ->time_base.den;
- st->pts.num = ic ->streams[audiostream] ->time_base.num;
- if ( oc->oformat->flags & AVFMT_GLOBALHEADER)
- st ->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
- if (av_q2d(ic ->streams[audiostream] ->codec->time_base)*ic ->streams[audiostream] ->codec->ticks_per_frame > av_q2d(ic ->streams[audiostream]->time_base) &&
- av_q2d(ic ->streams[audiostream]->time_base) < 1.0/1000)
- {
- st->codec->time_base = ic ->streams[audiostream] ->codec->time_base;
- st->codec->time_base.num *= ic ->streams[audiostream] ->codec->ticks_per_frame;
- }
- else
- {
- st->codec->time_base = ic ->streams[audiostream] ->time_base;
- }
- }
- /* set the output parameters (must be done even if no parameters). */
- //AVFormatParameters params, *ap = ¶ms;
- //memset(ap, 0, sizeof(*ap));
- if (av_set_parameters(oc, NULL /*ap*/ ) < 0)
- {
- printf( "invalid output format parameters.\n" );
- return -5;
- }
- oc ->flags |= AVFMT_FLAG_NONBLOCK;
- /*******************************************init output contents end**********************************************************/
- /* open the output file, if needed */
- if (!(oc ->oformat ->flags & AVFMT_NOFILE))
- {
- try
- {
- if (url_fopen(&oc->pb, ofile, URL_WRONLY) < 0)
- {
- printf( "Could not open file.\n" );
- return -6;
- }
- }
- catch (...)
- {
- printf( "Could not open file.\n" );
- return -6;
- }
- }
- /* write the stream header, if any */
- if ( 0 != av_write_header(oc))
- {
- printf( "write the stream header failed.\n" );
- return -7;
- }
- return 0;
- }