[android-developers] Re: avcodec_decoder_find problem

thank you very much...

I did it just like below and it works..but I can't tell that it's
completely true right now because I still continue to control my
code..
but thanks again

// Find the decoder for the video stream
pCodec=avcodec_find_decoder(CODEC_ID_H263);

if(pCodec==NULL) {
fprintf(stderr, "Unsupported codec!\n");
return -1; // Codec not found
}
pCodecCtx = avcodec_alloc_context();
// Open codec
if(avcodec_open(pCodecCtx, pCodec)<0)
return -1; // Could not open codec

On Feb 5, 9:15 pm, emymrin <emym...@gmail.com> wrote:
> Try to instrument avcodec_open and anything that it calls with
> __android_log_print to get an idea about what is wrong.
>
> On 5 фев, 19:03, cervello <eceooz...@gmail.com> wrote:
>
>
>
>
>
>
>
> > I'm trying to decode a video but in my code I think there is a problem
> > about avcodec_find decoder().. I control it with log_message and on
> > logcat there is "here1" but there isn't "here2" .. So I think there is
> > a problem with avcodec_find_decoder...
> > Can anyone any idea?? Please help me, Thanks
>
> > And how can I describe pCodecCtx->codec_id.. With %d and %s It didn't
> > work.
>
> > char info[40];
> > sprintf(info,"i degeri = %d",pCodecCtx->codec_id);
> > log_message(info);
>
> > *****Here is my code******
>
> > jint Java_com_test_Test_takePics(JNIEnv* env, jobject javaThis) {
> > int framecount;
> > log_message("Fonka girdi");
> > //OPENING FILE********************************************** ****
> > AVFormatContext *pFormatCtx;
> > unsigned char r, g, b;
> > int i,j;
>
> > char* filename = "/sdcard/do-beer-not-drugs.3gp";
> > av_register_all();
>
> > // Open video file
> > if(av_open_input_file(&pFormatCtx, filename, NULL, 0, NULL)!=0)
> > return -1; // Couldn't open file
>
> > // Retrieve stream information
> > if(av_find_stream_info(pFormatCtx)<0)
> > return -1; // Couldn't find stream information
>
> > // Dump information about file onto standard error
> > dump_format(pFormatCtx, 0, filename, 0);
> > framecount = pFormatCtx->streams[0]->nb_frames;
> > hist = malloc(framecount*sizeof(int*));
>
> > for (j = 0; j < framecount; ++j) {
> > hist[j] = malloc(sizeof(int)*64); // this is because we use 64-bin
> > histogram}
>
> > for (i = 0; i < framecount; i++) {
> > for (j = 0; j < 64; j++) {
> > hist[i][j] = 0;
>
> > }
> > }
>
> > AVCodecContext *pCodecCtx;
>
> > // Find the first video stream
> > int videoStream;
> > videoStream=-1;
> > /*char info[40];
> > sprintf(info,"i degeri = %d",pFormatCtx->nb_streams);
> > log_message(info);*/
> > for(i=0; i<pFormatCtx->nb_streams; i++){
> > if(pFormatCtx->streams[i]->codec->codec_type==CODEC_TYPE_VIDEO) {
> > videoStream=i;
> > break;
>
> > }}
>
> > if(videoStream==-1)
> > return -1; // Didn't find a video stream
>
> > AVCodec *pCodec;
> > char info[40];
> > sprintf(info,"i degeri = %d",pCodecCtx->codec_id);
> > log_message(info);
>
> > // Find the decoder for the video stream
> > pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
>
> > if(pCodec==NULL) {
> > fprintf(stderr, "Unsupported codec!\n");
> > return -1; // Codec not found}
>
> > log_message("here1");
> > // Open codec
> > if(avcodec_open(pCodecCtx, pCodec)<0)
> > return -1; // Could not open codec
> > log_message("here2");
> > // Get a pointer to the codec context for the video stream
> > pCodecCtx=pFormatCtx->streams[videoStream]->codec;
>
> > //STORING THE DATA********************************************** **
>
> > AVFrame *pFrame;
>
> > // Allocate video frame
> > pFrame=avcodec_alloc_frame();
>
> > // Allocate an AVFrame structure
> > AVFrame *pFrameRGB;
> > pFrameRGB=avcodec_alloc_frame();
>
> > if(pFrameRGB==NULL)
> > return -1;
>
> > uint8_t *buffer;
> > int numBytes;
> > // Determine required buffer size and allocate buffer
> > numBytes=avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width,
> > pCodecCtx->height);
> > buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
>
> > // Assign appropriate parts of buffer to image planes in pFrameRGB
> > // Note that pFrameRGB is an AVFrame, but AVFrame is a superset
> > // of AVPicture
> > avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24,
> > pCodecCtx->width, pCodecCtx->height);
>
> > //READING DATA********************************************** *****
>
> > int frameFinished;
> > AVPacket packet;
>
> > i=0;
> > while(av_read_frame(pFormatCtx, &packet)>=0) {
> > // Is this a packet from the video stream?
> > if(packet.stream_index==videoStream) {
> > // Decode video frame
> > avcodec_decode_video(pCodecCtx, pFrame, &frameFinished,
> > packet.data, packet.size);
>
> > // Did we get a video frame?
> > if(frameFinished) {
> > static struct SwsContext *img_convert_ctx;
>
> > // Convert the image into RGB format
> > if(img_convert_ctx == NULL) {
> > int w = pCodecCtx->width;
> > int h = pCodecCtx->height;
>
> > img_convert_ctx = sws_getContext(w, h,
> > pCodecCtx->pix_fmt,
> > w, h, PIX_FMT_RGB24, SWS_BICUBIC,
> > NULL, NULL, NULL);
> > if(img_convert_ctx == NULL) {
> > fprintf(stderr, "Cannot initialize the conversion context!\n");
> > exit(1);}
> > }
>
> > int ret = sws_scale(img_convert_ctx, pFrame->data, pFrame- >linesize,
> > 0, pCodecCtx->height, pFrameRGB->data, pFrameRGB->linesize);
>
> > for (j = 0; j < 3*pCodecCtx->height*pCodecCtx->width -3; j++) {
> > r = (unsigned char) pFrameRGB->data[0][j];
> > g = (unsigned char) pFrameRGB->data[0][j+1];
> > b = (unsigned char) pFrameRGB->data[0][j+2];
>
> > r = (unsigned char) ((r >> 2) & 0x30);
> > g = (unsigned char) ((g >> 4) & 0x0C);
> > b = (unsigned char) ((b >> 6) & 0x03);
>
> > unsigned char h = (unsigned char)(r|g|b);
> > hist[i][h]++;
>
> > }
>
> > // Save the frame to sdcard
> > SaveFrame(pFrameRGB, pCodecCtx->width, pCodecCtx->height, ++i);
>
> > }
> > }
>
> > // Free the packet that was allocated by av_read_frame
> > av_free_packet(&packet);
>
> > }
>
> > // Free the RGB image
> > av_free(buffer);
> > av_free(pFrameRGB);
>
> > // Free the YUV frame
> > av_free(pFrame);
>
> > // Close the codec
> > avcodec_close(pCodecCtx);
>
> > // Close the video file
> > av_close_input_file(pFormatCtx);
>
> > int keyframecount;
> > framecount=i;
> > keyframecount = select_keyFrames(framecount);
> > encodeVideo(env,keyframecount);
> > return 0;
>
> > }

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