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 {
37 static av_cold int vcr1_common_init(AVCodecContext *avctx)
39 VCR1Context *const a = avctx->priv_data;
41 avctx->coded_frame = &a->picture;
42 avcodec_get_frame_defaults(&a->picture);
47 static av_cold int vcr1_decode_init(AVCodecContext *avctx)
49 vcr1_common_init(avctx);
51 avctx->pix_fmt = AV_PIX_FMT_YUV410P;
56 static av_cold int vcr1_decode_end(AVCodecContext *avctx)
58 VCR1Context *s = avctx->priv_data;
60 if (s->picture.data[0])
61 avctx->release_buffer(avctx, &s->picture);
66 static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
67 int *data_size, AVPacket *avpkt)
69 const uint8_t *buf = avpkt->data;
70 int buf_size = avpkt->size;
71 VCR1Context *const a = avctx->priv_data;
72 AVFrame *picture = data;
73 AVFrame *const p = &a->picture;
74 const uint8_t *bytestream = buf;
78 avctx->release_buffer(avctx, p);
80 if(buf_size < 16 + avctx->height + avctx->width*avctx->height*5/8){
81 av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
82 return AVERROR(EINVAL);
86 if (avctx->get_buffer(avctx, p) < 0) {
87 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
90 p->pict_type = AV_PICTURE_TYPE_I;
93 for (i = 0; i < 16; i++) {
94 a->delta[i] = *bytestream++;
98 for (y = 0; y < avctx->height; y++) {
100 uint8_t *luma = &a->picture.data[0][y * a->picture.linesize[0]];
103 uint8_t *cb = &a->picture.data[1][(y >> 2) * a->picture.linesize[1]];
104 uint8_t *cr = &a->picture.data[2][(y >> 2) * a->picture.linesize[2]];
106 for (i = 0; i < 4; i++)
107 a->offset[i] = *bytestream++;
109 offset = a->offset[0] - a->delta[bytestream[2] & 0xF];
110 for (x = 0; x < avctx->width; x += 4) {
111 luma[0] = offset += a->delta[bytestream[2] & 0xF];
112 luma[1] = offset += a->delta[bytestream[2] >> 4];
113 luma[2] = offset += a->delta[bytestream[0] & 0xF];
114 luma[3] = offset += a->delta[bytestream[0] >> 4];
117 *cb++ = bytestream[3];
118 *cr++ = bytestream[1];
123 offset = a->offset[y & 3] - a->delta[bytestream[2] & 0xF];
125 for (x = 0; x < avctx->width; x += 8) {
126 luma[0] = offset += a->delta[bytestream[2] & 0xF];
127 luma[1] = offset += a->delta[bytestream[2] >> 4];
128 luma[2] = offset += a->delta[bytestream[3] & 0xF];
129 luma[3] = offset += a->delta[bytestream[3] >> 4];
130 luma[4] = offset += a->delta[bytestream[0] & 0xF];
131 luma[5] = offset += a->delta[bytestream[0] >> 4];
132 luma[6] = offset += a->delta[bytestream[1] & 0xF];
133 luma[7] = offset += a->delta[bytestream[1] >> 4];
140 *picture = a->picture;
141 *data_size = sizeof(AVPicture);
146 AVCodec ff_vcr1_decoder = {
148 .type = AVMEDIA_TYPE_VIDEO,
149 .id = AV_CODEC_ID_VCR1,
150 .priv_data_size = sizeof(VCR1Context),
151 .init = vcr1_decode_init,
152 .close = vcr1_decode_end,
153 .decode = vcr1_decode_frame,
154 .capabilities = CODEC_CAP_DR1,
155 .long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"),
158 /* Disable the encoder. */
159 #undef CONFIG_VCR1_ENCODER
160 #define CONFIG_VCR1_ENCODER 0
162 #if CONFIG_VCR1_ENCODER
164 #include "put_bits.h"
166 static int vcr1_encode_frame(AVCodecContext *avctx, unsigned char *buf,
167 int buf_size, void *data)
169 VCR1Context *const a = avctx->priv_data;
170 AVFrame *pict = data;
171 AVFrame *const p = &a->picture;
175 p->pict_type = AV_PICTURE_TYPE_I;
178 avpriv_align_put_bits(&a->pb);
179 flush_put_bits(&a->pb);
181 size = put_bits_count(&a->pb) / 32;
186 AVCodec ff_vcr1_encoder = {
188 .type = AVMEDIA_TYPE_VIDEO,
189 .id = AV_CODEC_ID_VCR1,
190 .priv_data_size = sizeof(VCR1Context),
191 .init = vcr1_common_init,
192 .encode = vcr1_encode_frame,
193 .long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"),
195 #endif /* CONFIG_VCR1_ENCODER */