static av_cold int encode_init(AVCodecContext* avc_context) { theora_info t_info; theora_comment t_comment; ogg_packet o_packet; unsigned int offset; TheoraContext *h = avc_context->priv_data; /* Set up the theora_info struct */ theora_info_init( &t_info ); t_info.width = FFALIGN(avc_context->width, 16); t_info.height = FFALIGN(avc_context->height, 16); t_info.frame_width = avc_context->width; t_info.frame_height = avc_context->height; t_info.offset_x = 0; t_info.offset_y = avc_context->height & 0xf; /* Swap numerator and denominator as time_base in AVCodecContext gives the * time period between frames, but theora_info needs the framerate. */ t_info.fps_numerator = avc_context->time_base.den; t_info.fps_denominator = avc_context->time_base.num; if (avc_context->sample_aspect_ratio.num != 0) { t_info.aspect_numerator = avc_context->sample_aspect_ratio.num; t_info.aspect_denominator = avc_context->sample_aspect_ratio.den; } else { t_info.aspect_numerator = 1; t_info.aspect_denominator = 1; } t_info.colorspace = OC_CS_UNSPECIFIED; t_info.pixelformat = OC_PF_420; t_info.target_bitrate = avc_context->bit_rate; t_info.keyframe_frequency = avc_context->gop_size; t_info.keyframe_frequency_force = avc_context->gop_size; t_info.keyframe_mindistance = avc_context->keyint_min; t_info.quality = 0; t_info.quick_p = 1; t_info.dropframes_p = 0; t_info.keyframe_auto_p = 1; t_info.keyframe_data_target_bitrate = t_info.target_bitrate * 1.5; t_info.keyframe_auto_threshold = 80; t_info.noise_sensitivity = 1; t_info.sharpness = 0; /* Now initialise libtheora */ if (theora_encode_init( &(h->t_state), &t_info ) != 0) { av_log(avc_context, AV_LOG_ERROR, "theora_encode_init failed\n"); return -1; } /* Clear up theora_info struct */ theora_info_clear( &t_info ); /* Output first header packet consisting of theora header, comment, and tables. Each one is prefixed with a 16bit size, then they are concatenated together into ffmpeg's extradata. */ offset = 0; /* Header */ theora_encode_header( &(h->t_state), &o_packet ); if (concatenate_packet( &offset, avc_context, &o_packet ) != 0) { return -1; } /* Comment */ theora_comment_init( &t_comment ); theora_encode_comment( &t_comment, &o_packet ); if (concatenate_packet( &offset, avc_context, &o_packet ) != 0) { return -1; } /* Tables */ theora_encode_tables( &(h->t_state), &o_packet ); if (concatenate_packet( &offset, avc_context, &o_packet ) != 0) { return -1; } /* Clear up theora_comment struct */ theora_comment_clear( &t_comment ); /* Set up the output AVFrame */ avc_context->coded_frame= avcodec_alloc_frame(); return 0; }