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/*
* libquicktime yuv4 encoder
*
* 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"
static av_cold int yuv4_encode_init(AVCodecContext *avctx)
{
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_encode_frame(AVCodecContext *avctx, uint8_t *buf,
int buf_size, void *data)
{
AVFrame *pic = data;
uint8_t *dst = buf;
uint8_t *y, *u, *v;
int i, j;
int output_size = 0;
if (buf_size < 6 * (avctx->width + 1 >> 1) * (avctx->height + 1 >> 1)) {
av_log(avctx, AV_LOG_ERROR, "Out buffer is too small.\n");
return AVERROR(ENOMEM);
}
avctx->coded_frame->reference = 0;
avctx->coded_frame->key_frame = 1;
avctx->coded_frame->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++) {
*dst++ = u[j] ^ 0x80;
*dst++ = v[j] ^ 0x80;
*dst++ = y[ 2 * j ];
*dst++ = y[ 2 * j + 1];
*dst++ = y[pic->linesize[0] + 2 * j ];
*dst++ = y[pic->linesize[0] + 2 * j + 1];
output_size += 6;
}
y += 2 * pic->linesize[0];
u += pic->linesize[1];
v += pic->linesize[2];
}
return output_size;
}
static av_cold int yuv4_encode_close(AVCodecContext *avctx)
{
av_freep(&avctx->coded_frame);
return 0;
}
AVCodec ff_yuv4_encoder = {
.name = "yuv4",
.type = AVMEDIA_TYPE_VIDEO,
.id = CODEC_ID_YUV4,
.init = yuv4_encode_init,
.encode = yuv4_encode_frame,
.close = yuv4_encode_close,
.pix_fmts = (const enum PixelFormat[]){ PIX_FMT_YUV420P, PIX_FMT_NONE },
.long_name = NULL_IF_CONFIG_SMALL("Uncompressed packed 4:2:0"),
};
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