Hi ffmpeg users!
I’ve been trying to speed down for H.264 decoder. I know the lowres is
low resolution supported by the decoder.
When decoding after setting the lowres(1), the results of
avcodec_decode_video2() occur the errors.
My program is as following:
bool init_first = true;
main()
{
FILE *fp, *ifs;
uint8_t buf[1024*10];
char *InFileStream = "InStream.264";
char *InFileData = "InStreamSize.txt";
fp = fopen("a.264", "rb");
ifs = fopen("InStreamSize.txt", "rb");
AVCodec* codec;
AVCodecContext* context;
AVFrame* picture;
AVPacket avpkt;
int frame = 0;
AVFrame* pFrameRGB;
int numBytes;
uint8_t *pFrameRGB_buffer;
BYTE *inbuf = new BYTE [1000000];
LPBYTE pbtYuv = NULL;
pbtYuv = new BYTE [ 1920 * 1080 * 2 ];
int nEncSize, len;
av_register_all(); //register all the
codecs
avcodec_register_all();
avcodec_init();
av_init_packet(&avpkt);
codec = avcodec_find_decoder(CODEC_ID_H264); //find the
H264 video decoder
if(!codec)
{
fprintf(stderr, "codec not found\n");
ReleaseMutex(hMutex);
return false;
}
context = avcodec_alloc_context();
picture = avcodec_alloc_frame();
pFrameRGB = avcodec_alloc_frame();
context->flags |=
CODEC_FLAG_PART;
context-->workaround_bugs = 1;
context->error_concealment = 3;
context->error_recognition = 1;
context->pix_fmt = PIX_FMT_YUV420P;
context->width = nWidth;
context->height = nHeight;
context->skip_loop_filter = AVDISCARD_ALL;
context->skip_frame =
AVDISCARD_NONREF; //AVDISCARD_NONREF
context->skip_idct =
AVDISCARD_ALL;
context->idct_algo = 1;
context->has_b_frames = 0;
context->refs = 1;
codec->max_lowres = 1;
if(codec->max_lowres)
{
context->lowres =
codec->max_lowres; // 1->1/2 size, 2->1/4 size, 3->1/8 -> error occur
context->flags |=
CODEC_FLAG_EMU_EDGE;
context->flags |=
CODEC_FLAG_GRAY;
}
if(codec->capabilities & CODEC_CAP_TRUNCATED) // &
CODEC_CAP_HWACCEL)
context->flags |= CODEC_FLAG_TRUNCATED; // we do
not send complete frames
if (avcodec_open(context, codec) < 0)
//open it
{
fprintf(stderr, "could not open codec\n");
return false;
}
PixelFormat iFormat = context->pix_fmt;
PixelFormat dFormat = PIX_FMT_YUYV422;
numBytes = avpicture_get_size(dFormat, context->width,
context->height);
pFrameRGB_buffer =(uint8_t
*)av_malloc(numBytes*sizeof(uint8_t));
avpicture_fill((AVPicture *)pFrameRGB, pFrameRGB_buffer,
dFormat, context->width, context->height);
for(;;)
{
ZeroMemory(inbuf, 1000000);
fread(&nEncSize, sizeof(DWORD), 1, ifs);
fread(inbuf,1,nEncSize, fp);
avpkt.size = nEncSize;
if(avpkt.size == 0)
break;
avpkt.data = inbuf;
while(avpkt.size >0)
{
if(init_first == true)
{
len =
avcodec_decode_video2(context, picture, &got_picture, &avpkt);
init_first = false;
}
len =
avcodec_decode_video2(context, Picture, &got_picture, &avpkt);
if(len < 0)
{
fprintf(stderr, "Error while
decoding frame %d\n", frame);
exit(1);
}
if(got_picture)
{
struct SwsContext
*img_convert_ctx = NULL;
img_convert_ctx =
sws_getContext( context->width, context->height,
context->pix_fmt,
context->width, context->height, dFormat,
SWS_FAST_BILINEAR,
NULL, NULL, NULL);
if(img_convert_ctx == NULL)
{
printf("[CFFH264Decode::MainDecode::SWScale] --- Exception\n");
exit(1);
}
int ret =
sws_scale(img_convert_ctx, picture->data, picture->linesize, 0,
context->height, pFrameRGB->data, pFrameRGB->linesize);
if(pFrameRGB_buffer)
{
av_free(
pFrameRGB_buffer );
pFrameRGB_buffer =
NULL;
}
sws_freeContext(img_convert_ctx);
if(img_convert_ctx != NULL)
img_convert_ctx =
NULL;
frame++;
}
avpkt.size -= len;
avpkt.data += len;
}
}
if(inbuf != NULL || pbtYuv != NULL)
{
delete [] inbuf;
delete [] pbtYuv;
}
if(context != NULL)
{
avcodec_close(context);
pGBCodec = NULL;
av_free(context); context = NULL;
av_free(picture); picture = NULL;
}
fclose(fp);
fclose(ifs);
}
How to solve the problems?
Thank you in advances,
nrson
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