2 * libquicktime yuv4 decoder
4 * Copyright (c) 2011 Carl Eugen Hoyos
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "codec_internal.h"
27 static av_cold int yuv4_decode_init(AVCodecContext *avctx)
29 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
34 static int yuv4_decode_frame(AVCodecContext *avctx, AVFrame *pic,
35 int *got_frame, AVPacket *avpkt)
37 const uint8_t *src = avpkt->data;
41 if (avpkt->size < 6 * (avctx->width + 1 >> 1) * (avctx->height + 1 >> 1)) {
42 av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
43 return AVERROR(EINVAL);
46 if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
49 pic->flags |= AV_FRAME_FLAG_KEY;
50 pic->pict_type = AV_PICTURE_TYPE_I;
56 for (i = 0; i < (avctx->height + 1) >> 1; i++) {
57 for (j = 0; j < (avctx->width + 1) >> 1; j++) {
61 y[ 2 * j + 1] = *src++;
62 y[pic->linesize[0] + 2 * j ] = *src++;
63 y[pic->linesize[0] + 2 * j + 1] = *src++;
66 y += 2 * pic->linesize[0];
67 u += pic->linesize[1];
68 v += pic->linesize[2];
76 const FFCodec ff_yuv4_decoder = {
78 CODEC_LONG_NAME("Uncompressed packed 4:2:0"),
79 .p.type = AVMEDIA_TYPE_VIDEO,
80 .p.id = AV_CODEC_ID_YUV4,
81 .init = yuv4_decode_init,
82 FF_CODEC_DECODE_CB(yuv4_decode_frame),
83 .p.capabilities = AV_CODEC_CAP_DR1,