FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/cyuv.c
Date: 2026-01-16 07:34:38
Exec Total Coverage
Lines: 61 69 88.4%
Functions: 2 2 100.0%
Branches: 12 18 66.7%
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1 /*
2 * Creative YUV (CYUV) Video Decoder
3 * by Mike Melanson (melanson@pcisys.net)
4 * based on "Creative YUV (CYUV) stream format for AVI":
5 * http://www.csse.monash.edu.au/~timf/videocodec/cyuv.txt
6 *
7 * Copyright (C) 2003 The FFmpeg project
8 *
9 * This file is part of FFmpeg.
10 *
11 * FFmpeg is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Lesser General Public
13 * License as published by the Free Software Foundation; either
14 * version 2.1 of the License, or (at your option) any later version.
15 *
16 * FFmpeg is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with FFmpeg; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 */
25
26 /**
27 * @file
28 * Creative YUV (CYUV) Video Decoder.
29 */
30
31 #include "config_components.h"
32
33 #include <string.h>
34
35 #include "avcodec.h"
36 #include "codec_internal.h"
37 #include "decode.h"
38 #include "libavutil/internal.h"
39
40 4 static av_cold int cyuv_decode_init(AVCodecContext *avctx)
41 {
42 /* width needs to be divisible by 4 for this codec to work */
43
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 4 if (avctx->width & 0x3)
44 ✗ return AVERROR_INVALIDDATA;
45
46 4 return 0;
47 }
48
49 177 static int cyuv_decode_frame(AVCodecContext *avctx, AVFrame *frame,
50 int *got_frame, AVPacket *avpkt)
51 {
52 177 const uint8_t *buf = avpkt->data;
53 177 int buf_size = avpkt->size;
54
55 unsigned char *y_plane;
56 unsigned char *u_plane;
57 unsigned char *v_plane;
58 int y_ptr;
59 int u_ptr;
60 int v_ptr;
61
62 /* prediction error tables (make it clear that they are signed values) */
63 177 const signed char *y_table = (const signed char*)buf + 0;
64 177 const signed char *u_table = (const signed char*)buf + 16;
65 177 const signed char *v_table = (const signed char*)buf + 32;
66
67 unsigned char y_pred, u_pred, v_pred;
68 int stream_ptr;
69 unsigned char cur_byte;
70 int pixel_groups;
71 177 int rawsize = avctx->height * FFALIGN(avctx->width,2) * 2;
72 int ret;
73
74
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 177 if (avctx->codec_id == AV_CODEC_ID_AURA) {
75 26 y_table = u_table;
76 26 u_table = v_table;
77 }
78 /* sanity check the buffer size: A buffer has 3x16-bytes tables
79 * followed by (height) lines each with 3 bytes to represent groups
80 * of 4 pixels. Thus, the total size of the buffer ought to be:
81 * (3 * 16) + height * (width * 3 / 4) */
82
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 177 if (buf_size == 48 + avctx->height * (avctx->width * 3 / 4)) {
83 176 avctx->pix_fmt = AV_PIX_FMT_YUV411P;
84
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 1 } else if(buf_size == rawsize ) {
85 ✗ avctx->pix_fmt = AV_PIX_FMT_UYVY422;
86 } else {
87 1 av_log(avctx, AV_LOG_ERROR, "got a buffer with %d bytes when %d were expected\n",
88 1 buf_size, 48 + avctx->height * (avctx->width * 3 / 4));
89 1 return AVERROR_INVALIDDATA;
90 }
91
92 /* pixel data starts 48 bytes in, after 3x16-byte tables */
93 176 stream_ptr = 48;
94
95
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 176 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
96 ✗ return ret;
97
98 176 y_plane = frame->data[0];
99 176 u_plane = frame->data[1];
100 176 v_plane = frame->data[2];
101
102
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 176 if (buf_size == rawsize) {
103 ✗ int linesize = FFALIGN(avctx->width, 2) * 2;
104 ✗ y_plane += frame->linesize[0] * avctx->height;
105 ✗ for (stream_ptr = 0; stream_ptr < rawsize; stream_ptr += linesize) {
106 ✗ y_plane -= frame->linesize[0];
107 ✗ memcpy(y_plane, buf+stream_ptr, linesize);
108 }
109 } else {
110
111 /* iterate through each line in the height */
112 176 for (y_ptr = 0, u_ptr = 0, v_ptr = 0;
113
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 24920 y_ptr < (avctx->height * frame->linesize[0]);
114 24744 y_ptr += frame->linesize[0] - avctx->width,
115 24744 u_ptr += frame->linesize[1] - avctx->width / 4,
116 24744 v_ptr += frame->linesize[2] - avctx->width / 4) {
117
118 /* reset predictors */
119 24744 cur_byte = buf[stream_ptr++];
120 24744 u_plane[u_ptr++] = u_pred = cur_byte & 0xF0;
121 24744 y_plane[y_ptr++] = y_pred = (cur_byte & 0x0F) << 4;
122
123 24744 cur_byte = buf[stream_ptr++];
124 24744 v_plane[v_ptr++] = v_pred = cur_byte & 0xF0;
125 24744 y_pred += y_table[cur_byte & 0x0F];
126 24744 y_plane[y_ptr++] = y_pred;
127
128 24744 cur_byte = buf[stream_ptr++];
129 24744 y_pred += y_table[cur_byte & 0x0F];
130 24744 y_plane[y_ptr++] = y_pred;
131 24744 y_pred += y_table[(cur_byte & 0xF0) >> 4];
132 24744 y_plane[y_ptr++] = y_pred;
133
134 /* iterate through the remaining pixel groups (4 pixels/group) */
135 24744 pixel_groups = avctx->width / 4 - 1;
136
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 1076736 while (pixel_groups--) {
137
138 1051992 cur_byte = buf[stream_ptr++];
139 1051992 u_pred += u_table[(cur_byte & 0xF0) >> 4];
140 1051992 u_plane[u_ptr++] = u_pred;
141 1051992 y_pred += y_table[cur_byte & 0x0F];
142 1051992 y_plane[y_ptr++] = y_pred;
143
144 1051992 cur_byte = buf[stream_ptr++];
145 1051992 v_pred += v_table[(cur_byte & 0xF0) >> 4];
146 1051992 v_plane[v_ptr++] = v_pred;
147 1051992 y_pred += y_table[cur_byte & 0x0F];
148 1051992 y_plane[y_ptr++] = y_pred;
149
150 1051992 cur_byte = buf[stream_ptr++];
151 1051992 y_pred += y_table[cur_byte & 0x0F];
152 1051992 y_plane[y_ptr++] = y_pred;
153 1051992 y_pred += y_table[(cur_byte & 0xF0) >> 4];
154 1051992 y_plane[y_ptr++] = y_pred;
155
156 }
157 }
158 }
159
160 176 *got_frame = 1;
161
162 176 return buf_size;
163 }
164
165 #if CONFIG_AURA_DECODER
166 const FFCodec ff_aura_decoder = {
167 .p.name = "aura",
168 CODEC_LONG_NAME("Auravision AURA"),
169 .p.type = AVMEDIA_TYPE_VIDEO,
170 .p.id = AV_CODEC_ID_AURA,
171 .init = cyuv_decode_init,
172 FF_CODEC_DECODE_CB(cyuv_decode_frame),
173 .p.capabilities = AV_CODEC_CAP_DR1,
174 };
175 #endif
176
177 #if CONFIG_CYUV_DECODER
178 const FFCodec ff_cyuv_decoder = {
179 .p.name = "cyuv",
180 CODEC_LONG_NAME("Creative YUV (CYUV)"),
181 .p.type = AVMEDIA_TYPE_VIDEO,
182 .p.id = AV_CODEC_ID_CYUV,
183 .init = cyuv_decode_init,
184 FF_CODEC_DECODE_CB(cyuv_decode_frame),
185 .p.capabilities = AV_CODEC_CAP_DR1,
186 };
187 #endif
188