/* * Copyright (c) 2011 Derek Buitenhuis * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License as published by the Free Software Foundation; * version 2 of the License. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * Known FOURCCs: * 'ULY0' (YCbCr 4:2:0), 'ULY2' (YCbCr 4:2:2), 'ULRG' (RGB), 'ULRA' (RGBA), * 'ULH0' (YCbCr 4:2:0 BT.709), 'ULH2' (YCbCr 4:2:2 BT.709) */ extern "C" { #include "avcodec.h" } #include "libutvideo.h" #include "get_bits.h" static av_cold int utvideo_decode_init(AVCodecContext *avctx) { UtVideoContext *utv = (UtVideoContext *)avctx->priv_data; UtVideoExtra info; int format; int begin_ret; if (avctx->extradata_size != 4*4) { av_log(avctx, AV_LOG_ERROR, "Extradata size (%d) mismatch.\n", avctx->extradata_size); return -1; } /* Read extradata */ info.version = AV_RL32(avctx->extradata); info.original_format = AV_RL32(avctx->extradata + 4); info.frameinfo_size = AV_RL32(avctx->extradata + 8); info.flags = AV_RL32(avctx->extradata + 12); /* Pick format based on FOURCC */ switch (avctx->codec_tag) { #ifdef UTV_BT709 case MKTAG('U', 'L', 'H', '0'): avctx->pix_fmt = AV_PIX_FMT_YUV420P; avctx->colorspace = AVCOL_SPC_BT709; format = UTVF_YV12; break; case MKTAG('U', 'L', 'H', '2'): avctx->pix_fmt = AV_PIX_FMT_YUYV422; avctx->colorspace = AVCOL_SPC_BT709; format = UTVF_YUY2; break; #endif case MKTAG('U', 'L', 'Y', '0'): avctx->pix_fmt = AV_PIX_FMT_YUV420P; format = UTVF_YV12; break; case MKTAG('U', 'L', 'Y', '2'): avctx->pix_fmt = AV_PIX_FMT_YUYV422; format = UTVF_YUY2; break; case MKTAG('U', 'L', 'R', 'G'): avctx->pix_fmt = AV_PIX_FMT_BGR24; format = UTVF_NFCC_BGR_BU; break; case MKTAG('U', 'L', 'R', 'A'): avctx->pix_fmt = AV_PIX_FMT_RGB32; format = UTVF_NFCC_BGRA_BU; break; default: av_log(avctx, AV_LOG_ERROR, "Not a Ut Video FOURCC: %X\n", avctx->codec_tag); return -1; } /* Only allocate the buffer once */ utv->buf_size = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height); utv->buffer = (uint8_t *)av_malloc(utv->buf_size * sizeof(uint8_t)); if (utv->buffer == NULL) { av_log(avctx, AV_LOG_ERROR, "Unable to allocate output buffer.\n"); return -1; } /* Allocate the output frame */ avctx->coded_frame = av_frame_alloc(); /* Ut Video only supports 8-bit */ avctx->bits_per_raw_sample = 8; /* Is it interlaced? */ avctx->coded_frame->interlaced_frame = info.flags & 0x800 ? 1 : 0; /* Apparently Ut Video doesn't store this info... */ avctx->coded_frame->top_field_first = 1; /* * Create a Ut Video instance. Since the function wants * an "interface name" string, pass it the name of the lib. */ utv->codec = CCodec::CreateInstance(UNFCC(avctx->codec_tag), "libavcodec"); /* Initialize Decoding */ begin_ret = utv->codec->DecodeBegin(format, avctx->width, avctx->height, CBGROSSWIDTH_WINDOWS, &info, sizeof(UtVideoExtra)); /* Check to see if the decoder initlized properly */ if (begin_ret != 0) { av_log(avctx, AV_LOG_ERROR, "Could not initialize decoder: %d\n", begin_ret); return -1; } return 0; } static int utvideo_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) { UtVideoContext *utv = (UtVideoContext *)avctx->priv_data; AVFrame *pic = avctx->coded_frame; int w = avctx->width, h = avctx->height; /* Set flags */ pic->reference = 0; pic->pict_type = AV_PICTURE_TYPE_I; pic->key_frame = 1; /* Decode the frame */ utv->codec->DecodeFrame(utv->buffer, avpkt->data, true); /* Set the output data depending on the colorspace */ switch (avctx->pix_fmt) { case AV_PIX_FMT_YUV420P: pic->linesize[0] = w; pic->linesize[1] = pic->linesize[2] = w / 2; pic->data[0] = utv->buffer; pic->data[2] = utv->buffer + (w * h); pic->data[1] = pic->data[2] + (w * h / 4); break; case AV_PIX_FMT_YUYV422: pic->linesize[0] = w * 2; pic->data[0] = utv->buffer; break; case AV_PIX_FMT_BGR24: case AV_PIX_FMT_RGB32: /* Make the linesize negative, since Ut Video uses bottom-up BGR */ pic->linesize[0] = -1 * w * (avctx->pix_fmt == AV_PIX_FMT_BGR24 ? 3 : 4); pic->data[0] = utv->buffer + utv->buf_size + pic->linesize[0]; break; } *got_frame = 1; av_frame_move_ref((AVFrame*)data, pic); return avpkt->size; } static av_cold int utvideo_decode_close(AVCodecContext *avctx) { UtVideoContext *utv = (UtVideoContext *)avctx->priv_data; /* Free output */ av_frame_free(&avctx->coded_frame); av_freep(&utv->buffer); /* Finish decoding and clean up the instance */ utv->codec->DecodeEnd(); CCodec::DeleteInstance(utv->codec); return 0; } AVCodec ff_libutvideo_decoder = { "libutvideo", NULL_IF_CONFIG_SMALL("Ut Video"), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_UTVIDEO, 0, //capabilities NULL, //supported_framerates NULL, //pix_fmts NULL, //supported_samplerates NULL, //sample_fmts NULL, //channel_layouts 0, //max_lowres NULL, //priv_class NULL, //profiles sizeof(UtVideoContext), NULL, //next NULL, //init_thread_copy NULL, //update_thread_context NULL, //defaults NULL, //init_static_data utvideo_decode_init, NULL, //encode NULL, //encode2 utvideo_decode_frame, utvideo_decode_close, };