FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/vcr1.c
Date: 2026-01-16 07:34:38
Exec Total Coverage
Lines: 46 51 90.2%
Functions: 2 2 100.0%
Branches: 18 24 75.0%
Line Branch Exec Source
1 /*
2 * ATI VCR1 codec
3 * Copyright (c) 2003 Michael Niedermayer
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 /**
23 * @file
24 * ATI VCR1 codec
25 */
26
27 #include "avcodec.h"
28 #include "codec_internal.h"
29 #include "decode.h"
30 #include "libavutil/avassert.h"
31 #include "libavutil/internal.h"
32
33 typedef struct VCR1Context {
34 int delta[16];
35 int offset[4];
36 } VCR1Context;
37
38 2 static av_cold int vcr1_decode_init(AVCodecContext *avctx)
39 {
40 2 avctx->pix_fmt = AV_PIX_FMT_YUV410P;
41
42
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 2 if (avctx->width % 8 || avctx->height%4) {
43 ✗ avpriv_request_sample(avctx, "odd dimensions (%d x %d) support", avctx->width, avctx->height);
44 ✗ return AVERROR_INVALIDDATA;
45 }
46
47 2 return 0;
48 }
49
50 128 static int vcr1_decode_frame(AVCodecContext *avctx, AVFrame *p,
51 int *got_frame, AVPacket *avpkt)
52 {
53 128 VCR1Context *const a = avctx->priv_data;
54 128 const uint8_t *bytestream = avpkt->data;
55 128 const uint8_t *bytestream_end = bytestream + avpkt->size;
56 int i, x, y, ret;
57
58
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 128 if(avpkt->size < 32 + avctx->height + avctx->width*avctx->height*5/8){
59 ✗ av_log(avctx, AV_LOG_ERROR, "Insufficient input data. %d < %d\n", avpkt->size , 32 + avctx->height + avctx->width*avctx->height*5/8);
60 ✗ return AVERROR(EINVAL);
61 }
62
63
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 128 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
64 ✗ return ret;
65
66
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 2176 for (i = 0; i < 16; i++) {
67 2048 a->delta[i] = *bytestream++;
68 2048 bytestream++;
69 }
70
71
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 18560 for (y = 0; y < avctx->height; y++) {
72 int offset;
73 18432 uint8_t *luma = &p->data[0][y * p->linesize[0]];
74
75
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 18432 if ((y & 3) == 0) {
76 4608 uint8_t *cb = &p->data[1][(y >> 2) * p->linesize[1]];
77 4608 uint8_t *cr = &p->data[2][(y >> 2) * p->linesize[2]];
78
79
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 4608 av_assert0 (bytestream_end - bytestream >= 4 + avctx->width);
80
81
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 23040 for (i = 0; i < 4; i++)
82 18432 a->offset[i] = *bytestream++;
83
84 4608 offset = a->offset[0] - a->delta[bytestream[2] & 0xF];
85
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 207360 for (x = 0; x < avctx->width; x += 4) {
86 202752 luma[0] = offset += a->delta[bytestream[2] & 0xF];
87 202752 luma[1] = offset += a->delta[bytestream[2] >> 4];
88 202752 luma[2] = offset += a->delta[bytestream[0] & 0xF];
89 202752 luma[3] = offset += a->delta[bytestream[0] >> 4];
90 202752 luma += 4;
91
92 202752 *cb++ = bytestream[3];
93 202752 *cr++ = bytestream[1];
94
95 202752 bytestream += 4;
96 }
97 } else {
98
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 13824 av_assert0 (bytestream_end - bytestream >= avctx->width / 2);
99
100 13824 offset = a->offset[y & 3] - a->delta[bytestream[2] & 0xF];
101
102
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 317952 for (x = 0; x < avctx->width; x += 8) {
103 304128 luma[0] = offset += a->delta[bytestream[2] & 0xF];
104 304128 luma[1] = offset += a->delta[bytestream[2] >> 4];
105 304128 luma[2] = offset += a->delta[bytestream[3] & 0xF];
106 304128 luma[3] = offset += a->delta[bytestream[3] >> 4];
107 304128 luma[4] = offset += a->delta[bytestream[0] & 0xF];
108 304128 luma[5] = offset += a->delta[bytestream[0] >> 4];
109 304128 luma[6] = offset += a->delta[bytestream[1] & 0xF];
110 304128 luma[7] = offset += a->delta[bytestream[1] >> 4];
111 304128 luma += 8;
112 304128 bytestream += 4;
113 }
114 }
115 }
116
117 128 *got_frame = 1;
118
119 128 return bytestream - avpkt->data;
120 }
121
122 const FFCodec ff_vcr1_decoder = {
123 .p.name = "vcr1",
124 CODEC_LONG_NAME("ATI VCR1"),
125 .p.type = AVMEDIA_TYPE_VIDEO,
126 .p.id = AV_CODEC_ID_VCR1,
127 .priv_data_size = sizeof(VCR1Context),
128 .init = vcr1_decode_init,
129 FF_CODEC_DECODE_CB(vcr1_decode_frame),
130 .p.capabilities = AV_CODEC_CAP_DR1,
131 };
132