FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/roqvideodec.c
Date: 2022-07-04 19:11:22
Exec Total Coverage
Lines: 129 137 94.2%
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 #include "libavutil/imgutils.h"
30
31 #include "avcodec.h"
32 #include "bytestream.h"
33 #include "codec_internal.h"
34 #include "internal.h"
35 #include "roqvideo.h"
36
37 225 static void roqvideo_decode_frame(RoqContext *ri, GetByteContext *gb)
38 {
39 225 unsigned int chunk_id = 0, chunk_arg = 0;
40 225 unsigned long chunk_size = 0;
41 225 int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
42 int vqid, xpos, ypos, xp, yp, x, y, mx, my;
43 roq_qcell *qcell;
44 int64_t chunk_start;
45
46
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428 while (bytestream2_get_bytes_left(gb) >= 8) {
47 428 chunk_id = bytestream2_get_le16(gb);
48 428 chunk_size = bytestream2_get_le32(gb);
49 428 chunk_arg = bytestream2_get_le16(gb);
50
51
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428 if(chunk_id == RoQ_QUAD_VQ)
52 225 break;
53
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203 if(chunk_id == RoQ_QUAD_CODEBOOK) {
54
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203 if((nv1 = chunk_arg >> 8) == 0)
55 67 nv1 = 256;
56
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203 if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
57 1 nv2 = 256;
58
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51102 for(i = 0; i < nv1; i++) {
59 50899 ri->cb2x2[i].y[0] = bytestream2_get_byte(gb);
60 50899 ri->cb2x2[i].y[1] = bytestream2_get_byte(gb);
61 50899 ri->cb2x2[i].y[2] = bytestream2_get_byte(gb);
62 50899 ri->cb2x2[i].y[3] = bytestream2_get_byte(gb);
63 50899 ri->cb2x2[i].u = bytestream2_get_byte(gb);
64 50899 ri->cb2x2[i].v = bytestream2_get_byte(gb);
65 }
66
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17934 for(i = 0; i < nv2; i++)
67
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88655 for(j = 0; j < 4; j++)
68 70924 ri->cb4x4[i].idx[j] = bytestream2_get_byte(gb);
69 }
70 }
71
72 225 chunk_start = bytestream2_tell(gb);
73 225 xpos = ypos = 0;
74
75
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225 if (chunk_size > bytestream2_get_bytes_left(gb)) {
76 av_log(ri->avctx, AV_LOG_ERROR, "Chunk does not fit in input buffer\n");
77 chunk_size = bytestream2_get_bytes_left(gb);
78 }
79
80
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113460 while (bytestream2_tell(gb) < chunk_start + chunk_size) {
81
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340342 for (yp = ypos; yp < ypos + 16; yp += 8)
82
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680707 for (xp = xpos; xp < xpos + 16; xp += 8) {
83
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453825 if (bytestream2_tell(gb) >= chunk_start + chunk_size) {
84 4 av_log(ri->avctx, AV_LOG_VERBOSE, "Chunk is too short\n");
85 4 return;
86 }
87
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453821 if (vqflg_pos < 0) {
88 56771 vqflg = bytestream2_get_le16(gb);
89 56771 vqflg_pos = 7;
90 }
91 453821 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
92 453821 vqflg_pos--;
93
94
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453821 switch(vqid) {
95 121738 case RoQ_ID_MOT:
96 121738 break;
97 9277 case RoQ_ID_FCC: {
98 9277 int byte = bytestream2_get_byte(gb);
99 9277 mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
100 9277 my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
101 9277 ff_apply_motion_8x8(ri, xp, yp, mx, my);
102 9277 break;
103 }
104 7001 case RoQ_ID_SLD:
105 7001 qcell = ri->cb4x4 + bytestream2_get_byte(gb);
106 7001 ff_apply_vector_4x4(ri, xp, yp, ri->cb2x2 + qcell->idx[0]);
107 7001 ff_apply_vector_4x4(ri, xp + 4, yp, ri->cb2x2 + qcell->idx[1]);
108 7001 ff_apply_vector_4x4(ri, xp, yp + 4, ri->cb2x2 + qcell->idx[2]);
109 7001 ff_apply_vector_4x4(ri, xp + 4, yp + 4, ri->cb2x2 + qcell->idx[3]);
110 7001 break;
111 315805 case RoQ_ID_CCC:
112
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1578984 for (k = 0; k < 4; k++) {
113 1263209 x = xp; y = yp;
114
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1263209 if(k & 0x01) x += 4;
115
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1263209 if(k & 0x02) y += 4;
116
117
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1263209 if (bytestream2_tell(gb) >= chunk_start + chunk_size) {
118 30 av_log(ri->avctx, AV_LOG_VERBOSE, "Chunk is too short\n");
119 30 return;
120 }
121
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1263179 if (vqflg_pos < 0) {
122 157911 vqflg = bytestream2_get_le16(gb);
123 157911 vqflg_pos = 7;
124 }
125 1263179 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
126
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1263179 vqflg_pos--;
127 switch(vqid) {
128 259115 case RoQ_ID_MOT:
129 259115 break;
130 521989 case RoQ_ID_FCC: {
131 521989 int byte = bytestream2_get_byte(gb);
132 521989 mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
133 521989 my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
134 521989 ff_apply_motion_4x4(ri, x, y, mx, my);
135 521989 break;
136 }
137 116817 case RoQ_ID_SLD:
138 116817 qcell = ri->cb4x4 + bytestream2_get_byte(gb);
139 116817 ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + qcell->idx[0]);
140 116817 ff_apply_vector_2x2(ri, x + 2, y, ri->cb2x2 + qcell->idx[1]);
141 116817 ff_apply_vector_2x2(ri, x, y + 2, ri->cb2x2 + qcell->idx[2]);
142 116817 ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + qcell->idx[3]);
143 116817 break;
144 365258 case RoQ_ID_CCC:
145 365258 ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + bytestream2_get_byte(gb));
146 365258 ff_apply_vector_2x2(ri, x + 2, y, ri->cb2x2 + bytestream2_get_byte(gb));
147 365258 ff_apply_vector_2x2(ri, x, y + 2, ri->cb2x2 + bytestream2_get_byte(gb));
148 365258 ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + bytestream2_get_byte(gb));
149 365258 break;
150 }
151 }
152 315775 break;
153 453791 default:
154 av_assert2(0);
155 }
156 }
157
158 113426 xpos += 16;
159
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113426 if (xpos >= ri->width) {
160 3596 xpos -= ri->width;
161 3596 ypos += 16;
162 }
163
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113426 if(ypos >= ri->height)
164 191 break;
165 }
166 }
167
168
169 10 static av_cold int roq_decode_init(AVCodecContext *avctx)
170 {
171 10 RoqContext *s = avctx->priv_data;
172
173 10 s->avctx = avctx;
174
175
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10 if (avctx->width % 16 || avctx->height % 16) {
176 avpriv_request_sample(avctx, "Dimensions not being a multiple of 16");
177 return AVERROR_PATCHWELCOME;
178 }
179
180 10 s->width = avctx->width;
181 10 s->height = avctx->height;
182
183 10 s->last_frame = av_frame_alloc();
184 10 s->current_frame = av_frame_alloc();
185
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10 if (!s->current_frame || !s->last_frame)
186 return AVERROR(ENOMEM);
187
188 10 avctx->pix_fmt = AV_PIX_FMT_YUVJ444P;
189 10 avctx->color_range = AVCOL_RANGE_JPEG;
190
191 10 return 0;
192 }
193
194 225 static int roq_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
195 int *got_frame, AVPacket *avpkt)
196 {
197 225 const uint8_t *buf = avpkt->data;
198 225 int buf_size = avpkt->size;
199 225 RoqContext *s = avctx->priv_data;
200
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225 int copy = !s->current_frame->data[0] && s->last_frame->data[0];
201 GetByteContext gb;
202 int ret;
203
204
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225 if ((ret = ff_reget_buffer(avctx, s->current_frame, 0)) < 0)
205 return ret;
206
207
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225 if (copy) {
208 4 ret = av_frame_copy(s->current_frame, s->last_frame);
209
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4 if (ret < 0)
210 return ret;
211 }
212
213 225 bytestream2_init(&gb, buf, buf_size);
214 225 roqvideo_decode_frame(s, &gb);
215
216
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225 if ((ret = av_frame_ref(rframe, s->current_frame)) < 0)
217 return ret;
218 225 *got_frame = 1;
219
220 /* shuffle frames */
221 225 FFSWAP(AVFrame *, s->current_frame, s->last_frame);
222
223 225 return buf_size;
224 }
225
226 10 static av_cold int roq_decode_end(AVCodecContext *avctx)
227 {
228 10 RoqContext *s = avctx->priv_data;
229
230 10 av_frame_free(&s->current_frame);
231 10 av_frame_free(&s->last_frame);
232
233 10 return 0;
234 }
235
236 const FFCodec ff_roq_decoder = {
237 .p.name = "roqvideo",
238 .p.long_name = NULL_IF_CONFIG_SMALL("id RoQ video"),
239 .p.type = AVMEDIA_TYPE_VIDEO,
240 .p.id = AV_CODEC_ID_ROQ,
241 .priv_data_size = sizeof(RoqContext),
242 .init = roq_decode_init,
243 .close = roq_decode_end,
244 FF_CODEC_DECODE_CB(roq_decode_frame),
245 .p.capabilities = AV_CODEC_CAP_DR1,
246 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
247 };
248