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