Help me about this problem
On Dec 14, 2013, at 1:08 PM, HungNT <[email protected]> wrote:
> why i'm can't call avformat_open_input(&pFormatCtx,"", NULL, NULL).my
> program alway crash when call this function for Open Custom buff.my Buffer is
> Raw Data video input here
>
>
> -(id)initWithBuffer:(void*)buff size:(int)buff_size{
>
> AVCodec *pCodec;
> avcodec_register_all();
> // Register all formats and codecs
> av_register_all();
> // av_init_packet(&packet);
> if(avformat_network_init()!=0){
> goto initError; // Couldn't init new work
> }
> uint8_t* pBuffer=av_malloc(buff_size*sizeof(uint8_t));
>
> pFormatCtx = avformat_alloc_context();
>
> AVIOContext* pIOCtx = avio_alloc_context(pBuffer,buff_size +
> FF_INPUT_BUFFER_PADDING_SIZE,0,buff,&read_packet, NULL, NULL);
> pIOCtx->seekable = 0;
>
> pFormatCtx->iformat=av_find_input_format("h264");
> pFormatCtx->flags = AVFMT_FLAG_CUSTOM_IO;
> pFormatCtx->iformat->flags=AVFMT_NOFILE;
> pFormatCtx->pb=pIOCtx;
> /**
> * Return the LIBAVFORMAT_VERSION_INT constant.
> */
> printf("======>FFmpeg Version:%d \n ", avformat_version());
>
> /**
> * Return the libavformat build-time configuration.
> */
> printf("========>FFmpeg libavformat Configuration:%s \n
> ",avformat_configuration());
>
> /**
> * Return the libavformat license.
> */
> printf("=========>FFmpeg libavformat license:%s \n",avformat_license());
>
> // Retrieve stream information
> if(avformat_open_input(&pFormatCtx,"", NULL, NULL)<0)
> goto initError;
>
> if(avformat_find_stream_info(pFormatCtx,NULL)<0){
> goto initError; // Couldn't find stream information
> }
> streamNo=-1;
> // Find the first video stream
> if ((streamNo = av_find_best_stream(pFormatCtx,AVMEDIA_TYPE_VIDEO, -1,
> -1, &pCodec, 0)) < 0)
> {
> av_log(NULL, AV_LOG_ERROR, "Cannot find a video stream in the input
> file %d\n",streamNo);
> goto initError;
> }
> // Get a pointer to the codec context for the video stream
> pCodecCtx=pFormatCtx->streams[streamNo]->codec;
>
> // Find the decoder for the video stream
> pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
> // pCodec=avcodec_find_decoder(AV_CODEC_ID_FLV1);
> if(pCodec==NULL)
> goto initError; // Codec not found
>
> // Open codec
> if(avcodec_open2(pCodecCtx, pCodec, NULL)<0)
> goto initError; // Could not open codec
>
> // Allocate video frame
> pFrame = avcodec_alloc_frame();
> if(pFrame==NULL)
> goto initError; // Not Found Frame
>
> uint8_t *buffer;
> int numBytes;
> // Determine required buffer size and allocate buffer
> //numBytes=avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width,
> // pCodecCtx->height);
> numBytes=avpicture_get_size(PIX_FMT_YUYV422, pCodecCtx->width,
> pCodecCtx->height);
> buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
>
> outputWidth = pCodecCtx->width;
> outputHeight = pCodecCtx->height;
>
> avformat_free_context(pFormatCtx);
> return self;
> initError:
> av_log(NULL, AV_LOG_ERROR,"====>Error %d \n", pFormatCtx->pb->error);
> NSLog(@"initError in VideoFrameExtractor");
> avformat_free_context(pFormatCtx);
> return nil;
> }
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