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/*
* 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)
*/
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 mismatch.\n");
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) {
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_RGB24_WIN;
break;
case MKTAG('U', 'L', 'R', 'A'):
avctx->pix_fmt = AV_PIX_FMT_RGB32;
format = UTVF_RGB32_WIN;
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 = avcodec_alloc_frame();
/* 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 *data_size, 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;
}
*data_size = sizeof(AVFrame);
*(AVFrame *)data = *pic;
return avpkt->size;
}
static av_cold int utvideo_decode_close(AVCodecContext *avctx)
{
UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
/* Free output */
av_freep(&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,
};
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