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
26 static av_cold int yuv4_decode_init(AVCodecContext *avctx)
28 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
30 avctx->coded_frame = avcodec_alloc_frame();
32 if (!avctx->coded_frame) {
33 av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n");
34 return AVERROR(ENOMEM);
40 static int yuv4_decode_frame(AVCodecContext *avctx, void *data,
41 int *got_frame, AVPacket *avpkt)
43 AVFrame *pic = avctx->coded_frame;
44 const uint8_t *src = avpkt->data;
49 avctx->release_buffer(avctx, pic);
51 if (avpkt->size < 6 * (avctx->width + 1 >> 1) * (avctx->height + 1 >> 1)) {
52 av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
53 return AVERROR(EINVAL);
58 if (ff_get_buffer(avctx, pic) < 0) {
59 av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
60 return AVERROR(ENOMEM);
64 pic->pict_type = AV_PICTURE_TYPE_I;
70 for (i = 0; i < (avctx->height + 1) >> 1; i++) {
71 for (j = 0; j < (avctx->width + 1) >> 1; j++) {
75 y[ 2 * j + 1] = *src++;
76 y[pic->linesize[0] + 2 * j ] = *src++;
77 y[pic->linesize[0] + 2 * j + 1] = *src++;
80 y += 2 * pic->linesize[0];
81 u += pic->linesize[1];
82 v += pic->linesize[2];
86 *(AVFrame *)data = *pic;
91 static av_cold int yuv4_decode_close(AVCodecContext *avctx)
93 if (avctx->coded_frame->data[0])
94 avctx->release_buffer(avctx, avctx->coded_frame);
96 av_freep(&avctx->coded_frame);
101 AVCodec ff_yuv4_decoder = {
103 .type = AVMEDIA_TYPE_VIDEO,
104 .id = AV_CODEC_ID_YUV4,
105 .init = yuv4_decode_init,
106 .decode = yuv4_decode_frame,
107 .close = yuv4_decode_close,
108 .capabilities = CODEC_CAP_DR1,
109 .long_name = NULL_IF_CONFIG_SMALL("Uncompressed packed 4:2:0"),