On 12/5/13, Eric Beuque <[email protected]> wrote: > Hi, i'm using libavcodec from FFMpeg 1.1.2. > > I'm decoding MJPEG stream. My problem is that i need to keep a reference to > the decoded frame, after the codec close. But when using avcodec_close, it > freed the AVFrame data. > > Here a sample program showing the function i use: > > int main(int argc, char **argv) > { > int bGotPicture; > > avcodec_register_all(); > > AVCodec* pCodec = avcodec_find_decoder (CODEC_ID_MJPEG); > AVCodecContext* pAVContext = avcodec_alloc_context3 (pCodec); > > avcodec_open2(pAVContext, pCodec, NULL); > > AVPacket packet; > av_init_packet (&packet); > > size_t iSize; > std::string content = get_file_contents("../img1.jpg", iSize); > packet.data = (unsigned char*)content.c_str(); > packet.size = iSize; > > AVFrame* pFrame = avcodec_alloc_frame(); > avcodec_decode_video2 (pAVContext, pFrame, &bGotPicture, &packet); > > // Here pFrame->data is valid > > av_free_packet(&packet); > avcodec_close(pAVContext); > av_free(pAVContext); > > // Here pFrame->data has been freed, access may crash > > av_free(pFrame); > pFrame = NULL; > } > > How i can tell libavcodec that i want to become the owner of the data and > be able to free it, to without codec context instance? I was thinking about > using get/release_buffer functions, but i don't know how to compute size of > the data. > > Is data memcpy the only way to do this? > > Note, that i also can't upgrade to new version of FFMPEG. > > Thanks for your help. >
Use reference counting system. They you need to manually free frame once you will not need it (otherwise you leak memory), so you do not need to do copy. _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
