[FFmpeg-user] How do I use the HW accerlator?

[nrson]

Hi ffmpeg experts!
I was writer previous sending e-mail(title:how do I use the HW 
acclerator?).
But anybody was not reply e-mail.
I am very confused sataus.

Anyway,
I thought if config.h file was done as following, My graphic 
board(Intel i5, Nvida Gefoarce) was recognized.
    #define CONFIG_HWACCELS 1
    #define CONFIG_H264_DXVA2_HWACCEL 1
But My graphic board did't it.

I have found ff_h264_decoder in h264.c changed to #if 
CONFIG_H264_DXVA2_HWACCEL ~ #endif
during searching in internet.

Before: AVCodec ff_h264_decoder = {
	.name                  = "h264",
	.type                  = AVMEDIA_TYPE_VIDEO,
	.id                    = CODEC_ID_H264,
	.priv_data_size        = sizeof(H264Context),
	.init                  = ff_h264_decode_init,
	.close                 = ff_h264_decode_end,
	.decode                = decode_frame,
	.capabilities          = CODEC_CAP_DR1 |CODEC_CAP_DELAY | 
CODEC_CAP_SLICE_THREADS |CODEC_CAP_FRAME_THREADS,
	.flush                 = flush_dpb,
	.long_name             = NULL_IF_CONFIG_SMALL("H.264 / AVC / MPEG-4 
AVC / MPEG-4 part 10"),
	.init_thread_copy      = 
ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
	.update_thread_context = 
ONLY_IF_THREADS_ENABLED(decode_update_thread_context),
	.profiles              = NULL_IF_CONFIG_SMALL(profiles),
	.priv_class            = &h264_class,
};
After:
#if CONFIG_H264_DXVA2_HWACCEL
#include "dxva2_h264.c"
AVCodec ff_h264_dxva_decoder = {
     .name                  = "h264_dxva2",
     .type                  = AVMEDIA_TYPE_VIDEO,
     .id                    = CODEC_ID_H264,
     .priv_data_size        = sizeof(H264Context),
     .init                  = ff_h264_decode_init,
     .close                 = ff_h264_decode_end,
	.decode					=	decode_slice,
     .capabilities          = CODEC_CAP_DR1 | CODEC_CAP_DELAY | 
CODEC_CAP_SLICE_THREADS |
                              CODEC_CAP_FRAME_THREADS, 
CODEC_CAP_HWACCEL,
     .flush                 = flush_dpb,
     .long_name             = NULL_IF_CONFIG_SMALL("H.264 / AVC / MPEG-4 
AVC / MPEG-4 part 10"),
     .init_thread_copy      = 
ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
     .update_thread_context = 
ONLY_IF_THREADS_ENABLED(decode_update_thread_context),
     .profiles              = NULL_IF_CONFIG_SMALL(profiles),
     .priv_class            = &h264_class,
	.pix_fmts			= (const enum PixelFormat[]){PIX_FMT_YUV420P, 
PIX_FMT_NONE},
};
#endif

There is errors after compiling as following
  libavcodec/dxva2_h264.c:396:12: error: conflicting types for 
'decode_slice'
  libavcodec/h264.c:3972:12: note: previous definition of 'decode_slice' 
was here
  libavcodec/h264.c:1299:12: warning: 'decode_init_thread_copy' defined 
but not used [-Wunused-function]
  libavcodec/h264.c:1315:12: warning: 'decode_update_thread_context' 
defined but not used [-Wunused-function]
  libavcodec/h264.c:4491:12: warning: 'decode_frame' defined but not 
used [-Wunused-function]

I thought that my works have been wrongly.
How can I use dxva2_h264?
I am really big ffmpeg user, please help me...!!!

Best regards in advances
-nrson-


On 2012-05-18 16:55, nrson wrote:
> Hi Carl!
>
> Thank you for your response quickly.
>
> I did it according to your advices and the config.h file created as
> following:
>
>   #define CONFIG_HWACCELS 1
>   #define CONFIG_H264_DXVA2_HWACCEL 1
>
> I want to recognize dxva2_h264 in my source but I can't use it.
> Please you think I am big ffmpeg beginner.
> My source is next following and what do I do?
>
> AVHWAccel h264_dxva2_hwaccel = NULL;
>
> av_register_all();
> avcodec_register_all();
>
> pGBCodec = avcodec_find_decoder(CODEC_ID_H264);
>
> if(pGBCodec)
> {
> pGBContext	=	avcodec_alloc_context();
> avcodec_get_context_defaults(pGBContext);
>
> if(!h264_dxva2_hwaccel)
> {
> 	AVHWAccel* hwaccel = NULL;
> 	while(hwaccel = av_hwaccel_next(hwaccel))
> 	{
> 		if(hwaccel->pix_fmt == PIX_FMT_DXVA2_VLD && hwaccel->id == 
> CODEC_ID_H264)
> 		{
> 			h264_dxva2_hwaccel = hwaccel;
> 			printf("dxva2_hwaccel = %s",h264_dxva2_hwaccel->name);
> 			break;
> 		}
> 	}
> }
> if(!h264_dxva2_hwaccel)
> {
> 	printf("dxv2 not supported by ffmpeg");
> 	exit(0);
> }
>          if(avcodec_open(pGBContext, pGBCodec) < 0)
> {
> 	avcodec_close(pGBContext);
> 	av_free(pGBContext);
>
> 	pGBContext = NULL;
> }
> }
>
> Best regards,
> nrson
>
> On 2012-05-17 19:27, Carl Eugen Hoyos wrote:
>> nrson <nrson <at> win4net.com> writes:
>>
>>> My configure and version on WinGW are as follows:
>>>
>>> ffmpeg version 0.9.1.git
>>
>> Always use current git head if you are not distributing FFmpeg
>>
>>>    built on Apr 20 2012 11:14:30 with gcc 4.6.2
>>>    configuration: --enable-gpl --enable-shared
>>
>>> --enable-swscale
>>> --enable-hwaccel=h264_dxva2 --enable-decoder=h264
>>> --enable-w32threads --enable-memalign-hack --disable-libvorbis
>>> --disable-libx264
>>
>> These options look all unneeded, they are the default iirc.
>>
>>> --disable-yasm
>>
>> This is not advisable if you care about performance.
>>
>>> When I reviewd the config.h after compiling, the results was as
>>> following
>>>
>>>    #define CONFIG_HWACCELS 0
>>>    #define CONFIG_H264_DXVA2_HWACCEL 0
>>>
>>> How do I solves the problem?
>>
>> Look at config.log, search for dxva, it will tell you that
>> you have to install additional headers.
>>
>> Carl Eugen
>>
>> _______________________________________________
>> ffmpeg-user mailing list
>> ffmpeg-user at ffmpeg.org
>> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
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