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  1. void ffmmGG()
  2. {
  3.  
  4.     AVFormatContext *pFormatCtx = NULL;
  5. 	int             i, videoStream;
  6. 	AVCodecContext  *pCodecCtx;
  7. 	AVCodec         *pCodec;
  8. 	AVFrame         *pFrame;
  9. 	AVFrame         *pFrameRGB;
  10. 	AVPacket        packet;
  11. 	int             frameFinished;
  12. 	int             numBytes;
  13. 	uint8_t         *buffer;
  14.  
  15. 	av_register_all();
  16. 	if( avformat_open_input(&pFormatCtx, "01.rmvb", NULL, NULL) != 0 )
  17. 		return -1;
  18.  
  19. 	if( avformat_find_stream_info(pFormatCtx, NULL ) < 0 )
  20. 		return -1;
  21.  
  22. 	av_dump_format(pFormatCtx, -1, "01.rmvb", 0);
  23.  
  24. 	videoStream = -1;
  25. 	for( i = 0; i < pFormatCtx->nb_streams; i++ )
  26. 	{
  27. 		if( pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
  28. 			videoStream = i;
  29. 			break;
  30. 		}
  31. 	}
  32. 	if( videoStream == -1 )
  33. 		return -1;
  34.  
  35. 	pCodecCtx = pFormatCtx->streams[videoStream]->codec;
  36.  
  37. 	pCodec = avcodec_find_decoder(pCodecCtx->codec_id);
  38. 	if( pCodec == NULL )
  39. 		return -1;
  40.  
  41. 	if( avcodec_open2(pCodecCtx, pCodec, NULL) < 0 )
  42. 		return -1;
  43.  
  44. 	pFrame = avcodec_alloc_frame();
  45. 	if( pFrame == NULL )
  46. 		return -1;
  47.  
  48. 	pFrameRGB = avcodec_alloc_frame();
  49. 	if( pFrameRGB == NULL )
  50. 		return -1;
  51.  
  52. 	numBytes = avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width,
  53. 		pCodecCtx->height);
  54.  
  55. 	buffer = (uint8_t*)av_malloc(numBytes);
  56.  
  57. 	avpicture_fill( (AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24,
  58. 		pCodecCtx->width, pCodecCtx->height);
  59.  
  60. 	i = 0;
  61. 	while( av_read_frame(pFormatCtx, &packet) >= 0 ) 
  62. 	{
  63. 		if( packet.stream_index == videoStream ) 
  64. 		{
  65. 			avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
  66. 			if( frameFinished ) 
  67. 			{
  68. 				struct SwsContext *img_convert_ctx = NULL;
  69. 				img_convert_ctx = 
  70. 					sws_getCachedContext(img_convert_ctx, pCodecCtx->width,
  71. 					pCodecCtx->height, pCodecCtx->pix_fmt,
  72. 					pCodecCtx->width, pCodecCtx->height,
  73. 					PIX_FMT_RGB24, SWS_BICUBIC,
  74. 					NULL, NULL, NULL);
  75. 				if( !img_convert_ctx ) 
  76. 				{
  77. 					fprintf(stderr, "Cannot initialize sws conversion context\n");
  78. 					exit(1);
  79. 				}
  80. 				sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data,
  81. 					pFrame->linesize, 0, pCodecCtx->height, pFrameRGB->data,
  82. 					pFrameRGB->linesize);
  83. 				if( i++ < 100 )	SaveFrame(pFrameRGB, pCodecCtx->width, pCodecCtx->height, i);
  84. 				else break;
  85. 			}
  86. 		}
  87. 		av_free_packet(&packet);
  88. 	}
  89. 	av_free(buffer);
  90. 	av_free(pFrameRGB);
  91. 	av_free(pFrame);
  92. 	avcodec_close(pCodecCtx);
  93. 	avformat_close_input(&pFormatCtx);
  94. }
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https://ideone.com/JqMWeL
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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