mirror of https://git.ffmpeg.org/ffmpeg.git
111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
/*
|
|
* libquicktime yuv4 decoder
|
|
*
|
|
* Copyright (c) 2011 Carl Eugen Hoyos
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser 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
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include "internal.h"
|
|
|
|
static av_cold int yuv4_decode_init(AVCodecContext *avctx)
|
|
{
|
|
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
|
|
|
|
avctx->coded_frame = avcodec_alloc_frame();
|
|
|
|
if (!avctx->coded_frame) {
|
|
av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n");
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int yuv4_decode_frame(AVCodecContext *avctx, void *data,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
AVFrame *pic = avctx->coded_frame;
|
|
const uint8_t *src = avpkt->data;
|
|
uint8_t *y, *u, *v;
|
|
int i, j;
|
|
|
|
if (pic->data[0])
|
|
avctx->release_buffer(avctx, pic);
|
|
|
|
if (avpkt->size < 6 * (avctx->width + 1 >> 1) * (avctx->height + 1 >> 1)) {
|
|
av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
pic->reference = 0;
|
|
|
|
if (ff_get_buffer(avctx, pic) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
pic->key_frame = 1;
|
|
pic->pict_type = AV_PICTURE_TYPE_I;
|
|
|
|
y = pic->data[0];
|
|
u = pic->data[1];
|
|
v = pic->data[2];
|
|
|
|
for (i = 0; i < (avctx->height + 1) >> 1; i++) {
|
|
for (j = 0; j < (avctx->width + 1) >> 1; j++) {
|
|
u[j] = *src++ ^ 0x80;
|
|
v[j] = *src++ ^ 0x80;
|
|
y[ 2 * j ] = *src++;
|
|
y[ 2 * j + 1] = *src++;
|
|
y[pic->linesize[0] + 2 * j ] = *src++;
|
|
y[pic->linesize[0] + 2 * j + 1] = *src++;
|
|
}
|
|
|
|
y += 2 * pic->linesize[0];
|
|
u += pic->linesize[1];
|
|
v += pic->linesize[2];
|
|
}
|
|
|
|
*got_frame = 1;
|
|
*(AVFrame *)data = *pic;
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
static av_cold int yuv4_decode_close(AVCodecContext *avctx)
|
|
{
|
|
if (avctx->coded_frame->data[0])
|
|
avctx->release_buffer(avctx, avctx->coded_frame);
|
|
|
|
av_freep(&avctx->coded_frame);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_yuv4_decoder = {
|
|
.name = "yuv4",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_YUV4,
|
|
.init = yuv4_decode_init,
|
|
.decode = yuv4_decode_frame,
|
|
.close = yuv4_decode_close,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("Uncompressed packed 4:2:0"),
|
|
};
|