3 * Copyright (c) 2003 Michael Niedermayer
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 #include "libavutil/internal.h"
31 typedef struct VCR1Context {
36 static av_cold int vcr1_decode_init(AVCodecContext *avctx)
38 avctx->pix_fmt = AV_PIX_FMT_YUV410P;
40 if (avctx->width % 8 || avctx->height%4) {
41 avpriv_request_sample(avctx, "odd dimensions support");
42 return AVERROR_PATCHWELCOME;
47 static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
48 int *got_frame, AVPacket *avpkt)
50 const uint8_t *buf = avpkt->data;
51 int buf_size = avpkt->size;
52 VCR1Context *const a = avctx->priv_data;
53 AVFrame *const p = data;
54 const uint8_t *bytestream = buf;
57 if(buf_size < 16 + avctx->height + avctx->width*avctx->height*5/8){
58 av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
59 return AVERROR(EINVAL);
62 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
64 p->pict_type = AV_PICTURE_TYPE_I;
67 for (i = 0; i < 16; i++) {
68 a->delta[i] = *bytestream++;
72 for (y = 0; y < avctx->height; y++) {
74 uint8_t *luma = &p->data[0][y * p->linesize[0]];
77 uint8_t *cb = &p->data[1][(y >> 2) * p->linesize[1]];
78 uint8_t *cr = &p->data[2][(y >> 2) * p->linesize[2]];
80 for (i = 0; i < 4; i++)
81 a->offset[i] = *bytestream++;
83 offset = a->offset[0] - a->delta[bytestream[2] & 0xF];
84 for (x = 0; x < avctx->width; x += 4) {
85 luma[0] = offset += a->delta[bytestream[2] & 0xF];
86 luma[1] = offset += a->delta[bytestream[2] >> 4];
87 luma[2] = offset += a->delta[bytestream[0] & 0xF];
88 luma[3] = offset += a->delta[bytestream[0] >> 4];
91 *cb++ = bytestream[3];
92 *cr++ = bytestream[1];
97 offset = a->offset[y & 3] - a->delta[bytestream[2] & 0xF];
99 for (x = 0; x < avctx->width; x += 8) {
100 luma[0] = offset += a->delta[bytestream[2] & 0xF];
101 luma[1] = offset += a->delta[bytestream[2] >> 4];
102 luma[2] = offset += a->delta[bytestream[3] & 0xF];
103 luma[3] = offset += a->delta[bytestream[3] >> 4];
104 luma[4] = offset += a->delta[bytestream[0] & 0xF];
105 luma[5] = offset += a->delta[bytestream[0] >> 4];
106 luma[6] = offset += a->delta[bytestream[1] & 0xF];
107 luma[7] = offset += a->delta[bytestream[1] >> 4];
119 AVCodec ff_vcr1_decoder = {
121 .type = AVMEDIA_TYPE_VIDEO,
122 .id = AV_CODEC_ID_VCR1,
123 .priv_data_size = sizeof(VCR1Context),
124 .init = vcr1_decode_init,
125 .decode = vcr1_decode_frame,
126 .capabilities = CODEC_CAP_DR1,
127 .long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"),