FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/roqvideodec.c
Date: 2026-01-23 14:02:51
Exec Total Coverage
Lines: 130 138 94.2%
Functions: 4 4 100.0%
Branches: 61 74 82.4%
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1 /*
2 * Copyright (C) 2003 The FFmpeg project
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /**
22 * @file
23 * id RoQ Video Decoder by Dr. Tim Ferguson
24 * For more information about the id RoQ format, visit:
25 * http://www.csse.monash.edu.au/~timf/
26 */
27
28 #include "libavutil/avassert.h"
29
30 #include "avcodec.h"
31 #include "bytestream.h"
32 #include "codec_internal.h"
33 #include "decode.h"
34 #include "roqvideo.h"
35
36 225 static void roqvideo_decode_frame(RoqContext *ri, GetByteContext *gb)
37 {
38 225 unsigned int chunk_id = 0, chunk_arg = 0;
39 225 unsigned long chunk_size = 0;
40 225 int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
41 int vqid, xpos, ypos, xp, yp, x, y, mx, my;
42 roq_qcell *qcell;
43 int64_t chunk_start;
44
45
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 428 while (bytestream2_get_bytes_left(gb) >= 8) {
46 428 chunk_id = bytestream2_get_le16(gb);
47 428 chunk_size = bytestream2_get_le32(gb);
48 428 chunk_arg = bytestream2_get_le16(gb);
49
50
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 428 if(chunk_id == RoQ_QUAD_VQ)
51 225 break;
52
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 203 if(chunk_id == RoQ_QUAD_CODEBOOK) {
53
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 203 if((nv1 = chunk_arg >> 8) == 0)
54 68 nv1 = 256;
55
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 203 if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
56 1 nv2 = 256;
57
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 51103 for(i = 0; i < nv1; i++) {
58 50900 ri->cb2x2[i].y[0] = bytestream2_get_byte(gb);
59 50900 ri->cb2x2[i].y[1] = bytestream2_get_byte(gb);
60 50900 ri->cb2x2[i].y[2] = bytestream2_get_byte(gb);
61 50900 ri->cb2x2[i].y[3] = bytestream2_get_byte(gb);
62 50900 ri->cb2x2[i].u = bytestream2_get_byte(gb);
63 50900 ri->cb2x2[i].v = bytestream2_get_byte(gb);
64 }
65
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 17950 for(i = 0; i < nv2; i++)
66
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 88735 for(j = 0; j < 4; j++)
67 70988 ri->cb4x4[i].idx[j] = bytestream2_get_byte(gb);
68 }
69 }
70
71 225 chunk_start = bytestream2_tell(gb);
72 225 xpos = ypos = 0;
73
74
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 225 if (chunk_size > bytestream2_get_bytes_left(gb)) {
75 ✗ av_log(ri->logctx, AV_LOG_ERROR, "Chunk does not fit in input buffer\n");
76 ✗ chunk_size = bytestream2_get_bytes_left(gb);
77 }
78
79
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 113460 while (bytestream2_tell(gb) < chunk_start + chunk_size) {
80
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 340342 for (yp = ypos; yp < ypos + 16; yp += 8)
81
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 680707 for (xp = xpos; xp < xpos + 16; xp += 8) {
82
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 453825 if (bytestream2_tell(gb) >= chunk_start + chunk_size) {
83 4 av_log(ri->logctx, AV_LOG_VERBOSE, "Chunk is too short\n");
84 4 return;
85 }
86
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 453821 if (vqflg_pos < 0) {
87 56773 vqflg = bytestream2_get_le16(gb);
88 56773 vqflg_pos = 7;
89 }
90 453821 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
91 453821 vqflg_pos--;
92
93
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 453821 switch(vqid) {
94 121748 case RoQ_ID_MOT:
95 121748 break;
96 9309 case RoQ_ID_FCC: {
97 9309 int byte = bytestream2_get_byte(gb);
98 9309 mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
99 9309 my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
100 9309 ff_apply_motion_8x8(ri, xp, yp, mx, my);
101 9309 break;
102 }
103 7024 case RoQ_ID_SLD:
104 7024 qcell = ri->cb4x4 + bytestream2_get_byte(gb);
105 7024 ff_apply_vector_4x4(ri, xp, yp, ri->cb2x2 + qcell->idx[0]);
106 7024 ff_apply_vector_4x4(ri, xp + 4, yp, ri->cb2x2 + qcell->idx[1]);
107 7024 ff_apply_vector_4x4(ri, xp, yp + 4, ri->cb2x2 + qcell->idx[2]);
108 7024 ff_apply_vector_4x4(ri, xp + 4, yp + 4, ri->cb2x2 + qcell->idx[3]);
109 7024 break;
110 315740 case RoQ_ID_CCC:
111
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 1578659 for (k = 0; k < 4; k++) {
112 1262949 x = xp; y = yp;
113
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 1262949 if(k & 0x01) x += 4;
114
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 1262949 if(k & 0x02) y += 4;
115
116
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 1262949 if (bytestream2_tell(gb) >= chunk_start + chunk_size) {
117 30 av_log(ri->logctx, AV_LOG_VERBOSE, "Chunk is too short\n");
118 30 return;
119 }
120
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 1262919 if (vqflg_pos < 0) {
121 157875 vqflg = bytestream2_get_le16(gb);
122 157875 vqflg_pos = 7;
123 }
124 1262919 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
125 1262919 vqflg_pos--;
126
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 1262919 switch(vqid) {
127 259086 case RoQ_ID_MOT:
128 259086 break;
129 522066 case RoQ_ID_FCC: {
130 522066 int byte = bytestream2_get_byte(gb);
131 522066 mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
132 522066 my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
133 522066 ff_apply_motion_4x4(ri, x, y, mx, my);
134 522066 break;
135 }
136 116905 case RoQ_ID_SLD:
137 116905 qcell = ri->cb4x4 + bytestream2_get_byte(gb);
138 116905 ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + qcell->idx[0]);
139 116905 ff_apply_vector_2x2(ri, x + 2, y, ri->cb2x2 + qcell->idx[1]);
140 116905 ff_apply_vector_2x2(ri, x, y + 2, ri->cb2x2 + qcell->idx[2]);
141 116905 ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + qcell->idx[3]);
142 116905 break;
143 364862 case RoQ_ID_CCC:
144 364862 ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + bytestream2_get_byte(gb));
145 364862 ff_apply_vector_2x2(ri, x + 2, y, ri->cb2x2 + bytestream2_get_byte(gb));
146 364862 ff_apply_vector_2x2(ri, x, y + 2, ri->cb2x2 + bytestream2_get_byte(gb));
147 364862 ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + bytestream2_get_byte(gb));
148 364862 break;
149 }
150 }
151 315710 break;
152 453791 default:
153 av_assert2(0);
154 }
155 }
156
157 113426 xpos += 16;
158
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 113426 if (xpos >= ri->width) {
159 3596 xpos -= ri->width;
160 3596 ypos += 16;
161 }
162
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 113426 if(ypos >= ri->height)
163 191 break;
164 }
165 }
166
167
168 10 static av_cold int roq_decode_init(AVCodecContext *avctx)
169 {
170 10 RoqContext *s = avctx->priv_data;
171
172 10 s->logctx = avctx;
173
174
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 10 if (avctx->width % 16 || avctx->height % 16) {
175 ✗ avpriv_request_sample(avctx, "Dimensions not being a multiple of 16");
176 ✗ return AVERROR_PATCHWELCOME;
177 }
178
179 10 s->width = avctx->width;
180 10 s->height = avctx->height;
181
182 10 s->last_frame = av_frame_alloc();
183 10 s->current_frame = av_frame_alloc();
184
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 10 if (!s->current_frame || !s->last_frame)
185 ✗ return AVERROR(ENOMEM);
186
187 10 avctx->pix_fmt = AV_PIX_FMT_YUVJ444P;
188 10 avctx->color_range = AVCOL_RANGE_JPEG;
189
190 10 return 0;
191 }
192
193 225 static int roq_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
194 int *got_frame, AVPacket *avpkt)
195 {
196 225 const uint8_t *buf = avpkt->data;
197 225 int buf_size = avpkt->size;
198 225 RoqContext *s = avctx->priv_data;
199
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 225 int copy = !s->current_frame->data[0] && s->last_frame->data[0];
200 GetByteContext gb;
201 int ret;
202
203
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 225 if ((ret = ff_reget_buffer(avctx, s->current_frame, 0)) < 0)
204 ✗ return ret;
205
206
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 225 if (copy) {
207 4 ret = av_frame_copy(s->current_frame, s->last_frame);
208
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 4 if (ret < 0)
209 ✗ return ret;
210 }
211
212 225 bytestream2_init(&gb, buf, buf_size);
213 225 roqvideo_decode_frame(s, &gb);
214
215
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 225 if ((ret = av_frame_ref(rframe, s->current_frame)) < 0)
216 ✗ return ret;
217 225 *got_frame = 1;
218
219 /* shuffle frames */
220 225 FFSWAP(AVFrame *, s->current_frame, s->last_frame);
221
222 225 return buf_size;
223 }
224
225 10 static av_cold int roq_decode_end(AVCodecContext *avctx)
226 {
227 10 RoqContext *s = avctx->priv_data;
228
229 10 av_frame_free(&s->current_frame);
230 10 av_frame_free(&s->last_frame);
231
232 10 return 0;
233 }
234
235 const FFCodec ff_roq_decoder = {
236 .p.name = "roqvideo",
237 CODEC_LONG_NAME("id RoQ video"),
238 .p.type = AVMEDIA_TYPE_VIDEO,
239 .p.id = AV_CODEC_ID_ROQ,
240 .priv_data_size = sizeof(RoqContext),
241 .init = roq_decode_init,
242 .close = roq_decode_end,
243 FF_CODEC_DECODE_CB(roq_decode_frame),
244 .p.capabilities = AV_CODEC_CAP_DR1,
245 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
246 };
247