FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/dxa.c
Date: 2026-04-20 20:24:43
Exec Total Coverage
Lines: 115 140 82.1%
Functions: 3 3 100.0%
Branches: 52 88 59.1%
Line Branch Exec Source
1 /*
2 * DXA demuxer
3 * Copyright (c) 2007 Konstantin Shishkov
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 #include <inttypes.h>
23
24 #include "libavutil/intreadwrite.h"
25 #include "avformat.h"
26 #include "avio_internal.h"
27 #include "demux.h"
28 #include "internal.h"
29 #include "riff.h"
30
31 #define DXA_EXTRA_SIZE 9
32
33 typedef struct DXAContext {
34 int frames;
35 int has_sound;
36 int bpc;
37 uint32_t bytes_left;
38 int64_t wavpos, vidpos;
39 int readvid;
40 }DXAContext;
41
42 7467 static int dxa_probe(const AVProbeData *p)
43 {
44 int w, h;
45
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 7467 times.
 7467 if (p->buf_size < 15)
46 ✗ return 0;
47 7467 w = AV_RB16(p->buf + 11);
48 7467 h = AV_RB16(p->buf + 13);
49 /* check file header */
50
4/4
✓ Branch 0 taken 144 times.
✓ Branch 1 taken 7323 times.
✓ Branch 2 taken 3 times.
✓ Branch 3 taken 141 times.
 7467 if (p->buf[0] == 'D' && p->buf[1] == 'E' &&
51
3/6
✓ Branch 0 taken 3 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 3 times.
✗ Branch 3 not taken.
✓ Branch 4 taken 3 times.
✗ Branch 5 not taken.
 3 p->buf[2] == 'X' && p->buf[3] == 'A' &&
52
3/6
✓ Branch 0 taken 3 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 3 times.
✗ Branch 3 not taken.
✓ Branch 4 taken 3 times.
✗ Branch 5 not taken.
 3 w && w <= 2048 && h && h <= 2048)
53 3 return AVPROBE_SCORE_MAX;
54 else
55 7464 return 0;
56 }
57
58 3 static int dxa_read_header(AVFormatContext *s)
59 {
60 3 AVIOContext *pb = s->pb;
61 3 DXAContext *c = s->priv_data;
62 AVStream *st, *ast;
63 uint32_t tag;
64 int32_t fps;
65 int w, h;
66 int num, den;
67 int flags;
68 int ret;
69
70 3 tag = avio_rl32(pb);
71
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 3 times.
 3 if (tag != MKTAG('D', 'E', 'X', 'A'))
72 ✗ return AVERROR_INVALIDDATA;
73 3 flags = avio_r8(pb);
74 3 c->frames = avio_rb16(pb);
75
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 3 times.
 3 if(!c->frames){
76 ✗ av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");
77 ✗ return AVERROR_INVALIDDATA;
78 }
79
80 3 fps = avio_rb32(pb);
81
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 3 times.
 3 if(fps > 0){
82 ✗ den = 1000;
83 ✗ num = fps;
84
2/4
✓ Branch 0 taken 3 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 3 times.
✗ Branch 3 not taken.
 3 }else if (fps < 0 && fps > INT_MIN){
85 3 den = 100000;
86 3 num = -fps;
87 }else{
88 ✗ den = 10;
89 ✗ num = 1;
90 }
91 3 w = avio_rb16(pb);
92 3 h = avio_rb16(pb);
93 3 c->has_sound = 0;
94
95 3 st = avformat_new_stream(s, NULL);
96
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 3 times.
 3 if (!st)
97 ✗ return AVERROR(ENOMEM);
98
99 // Parse WAV data header
100
2/2
✓ Branch 1 taken 2 times.
✓ Branch 2 taken 1 times.
 3 if(avio_rl32(pb) == MKTAG('W', 'A', 'V', 'E')){
101 uint32_t size, fsize;
102 2 c->has_sound = 1;
103 2 size = avio_rb32(pb);
104 2 c->vidpos = avio_tell(pb) + size;
105 2 avio_skip(pb, 16);
106 2 fsize = avio_rl32(pb);
107
108 2 ast = avformat_new_stream(s, NULL);
109
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2 times.
 2 if (!ast)
110 ✗ return AVERROR(ENOMEM);
111 2 ret = ff_get_wav_header(s, pb, ast->codecpar, fsize, 0);
112
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2 times.
 2 if (ret < 0)
113 ✗ return ret;
114
1/2
✓ Branch 0 taken 2 times.
✗ Branch 1 not taken.
 2 if (ast->codecpar->sample_rate > 0)
115 2 avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
116 // find 'data' chunk
117
2/4
✓ Branch 1 taken 4 times.
✗ Branch 2 not taken.
✓ Branch 4 taken 4 times.
✗ Branch 5 not taken.
 4 while(avio_tell(pb) < c->vidpos && !avio_feof(pb)){
118 4 tag = avio_rl32(pb);
119 4 fsize = avio_rl32(pb);
120
2/2
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 2 times.
 4 if(tag == MKTAG('d', 'a', 't', 'a')) break;
121 2 avio_skip(pb, fsize);
122 }
123 2 c->bpc = (fsize + (int64_t)c->frames - 1) / c->frames;
124
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2 times.
 2 if (c->bpc < 0)
125 ✗ return AVERROR_INVALIDDATA;
126
1/2
✓ Branch 0 taken 2 times.
✗ Branch 1 not taken.
 2 if(ast->codecpar->block_align) {
127
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2 times.
 2 if (c->bpc > INT_MAX - ast->codecpar->block_align + 1)
128 ✗ return AVERROR_INVALIDDATA;
129 2 c->bpc = ((c->bpc - 1 + ast->codecpar->block_align) / ast->codecpar->block_align) * ast->codecpar->block_align;
130 }
131 2 c->bytes_left = fsize;
132 2 c->wavpos = avio_tell(pb);
133 2 avio_seek(pb, c->vidpos, SEEK_SET);
134 }
135
136 /* now we are ready: build format streams */
137 3 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
138 3 st->codecpar->codec_id = AV_CODEC_ID_DXA;
139 3 st->codecpar->width = w;
140 3 st->codecpar->height = h;
141 3 av_reduce(&den, &num, den, num, (1UL<<31)-1);
142 3 avpriv_set_pts_info(st, 33, num, den);
143 /* flags & 0x80 means that image is interlaced,
144 * flags & 0x40 means that image has double height
145 * either way set true height
146 */
147
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 2 times.
 3 if(flags & 0xC0){
148 1 st->codecpar->height >>= 1;
149 }
150 3 c->readvid = !c->has_sound;
151 3 c->vidpos = avio_tell(pb);
152 3 s->start_time = 0;
153 3 s->duration = av_rescale(c->frames, AV_TIME_BASE * (int64_t)num, den);
154 3 av_log(s, AV_LOG_DEBUG, "%d frame(s)\n",c->frames);
155
156 3 return 0;
157 }
158
159 172 static int dxa_read_packet(AVFormatContext *s, AVPacket *pkt)
160 {
161 172 DXAContext *c = s->priv_data;
162 int ret;
163 uint32_t size;
164 uint8_t buf[DXA_EXTRA_SIZE], pal[768+4];
165 172 int pal_size = 0;
166
167
5/6
✓ Branch 0 taken 93 times.
✓ Branch 1 taken 79 times.
✓ Branch 2 taken 80 times.
✓ Branch 3 taken 13 times.
✓ Branch 4 taken 80 times.
✗ Branch 5 not taken.
 172 if(!c->readvid && c->has_sound && c->bytes_left){
168 80 c->readvid = 1;
169 80 avio_seek(s->pb, c->wavpos, SEEK_SET);
170 80 size = FFMIN(c->bytes_left, c->bpc);
171 80 ret = av_get_packet(s->pb, pkt, size);
172 80 pkt->stream_index = 1;
173
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 80 times.
 80 if(ret != size)
174 ✗ return AVERROR_INVALIDDATA;
175 80 c->bytes_left -= size;
176 80 c->wavpos = avio_tell(s->pb);
177 80 return 0;
178 }
179 92 avio_seek(s->pb, c->vidpos, SEEK_SET);
180
2/4
✓ Branch 1 taken 95 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 95 times.
✗ Branch 4 not taken.
 95 while(!avio_feof(s->pb) && c->frames){
181 uint32_t tag;
182
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 95 times.
 95 if ((ret = avio_read(s->pb, buf, 4)) != 4) {
183 ✗ av_log(s, AV_LOG_ERROR, "failed reading chunk type\n");
184 ✗ return ret < 0 ? ret : AVERROR_INVALIDDATA;
185 }
186 95 tag = AV_RL32(buf);
187
3/4
✓ Branch 0 taken 44 times.
✓ Branch 1 taken 3 times.
✓ Branch 2 taken 48 times.
✗ Branch 3 not taken.
 95 switch (tag) {
188 44 case MKTAG('N', 'U', 'L', 'L'):
189
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 44 times.
 44 if ((ret = av_new_packet(pkt, 4 + pal_size)) < 0)
190 92 return ret;
191 44 pkt->stream_index = 0;
192
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 44 times.
 44 if(pal_size) memcpy(pkt->data, pal, pal_size);
193 44 memcpy(pkt->data + pal_size, buf, 4);
194 44 c->frames--;
195 44 c->vidpos = avio_tell(s->pb);
196 44 c->readvid = 0;
197 44 return 0;
198 3 case MKTAG('C', 'M', 'A', 'P'):
199 3 pal_size = 768+4;
200 3 memcpy(pal, buf, 4);
201 3 avio_read(s->pb, pal + 4, 768);
202 3 break;
203 48 case MKTAG('F', 'R', 'A', 'M'):
204
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 48 times.
 48 if ((ret = avio_read(s->pb, buf + 4, DXA_EXTRA_SIZE - 4)) != DXA_EXTRA_SIZE - 4) {
205 ✗ av_log(s, AV_LOG_ERROR, "failed reading dxa_extra\n");
206 ✗ return ret < 0 ? ret : AVERROR_INVALIDDATA;
207 }
208 48 size = AV_RB32(buf + 5);
209
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 48 times.
 48 if(size > 0xFFFFFF){
210 ✗ av_log(s, AV_LOG_ERROR, "Frame size is too big: %"PRIu32"\n",
211 size);
212 ✗ return AVERROR_INVALIDDATA;
213 }
214 48 ret = av_new_packet(pkt, size + DXA_EXTRA_SIZE + pal_size);
215
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 48 times.
 48 if (ret < 0)
216 ✗ return ret;
217 48 memcpy(pkt->data + pal_size, buf, DXA_EXTRA_SIZE);
218 48 ret = ffio_read_size(s->pb, pkt->data + DXA_EXTRA_SIZE + pal_size, size);
219
2/2
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 46 times.
 48 if (ret < 0)
220 2 return ret;
221
2/2
✓ Branch 0 taken 3 times.
✓ Branch 1 taken 43 times.
 46 if(pal_size) memcpy(pkt->data, pal, pal_size);
222 46 pkt->stream_index = 0;
223 46 c->frames--;
224 46 c->vidpos = avio_tell(s->pb);
225 46 c->readvid = 0;
226 46 return 0;
227 ✗ default:
228 ✗ av_log(s, AV_LOG_ERROR, "Unknown tag %s\n", av_fourcc2str(tag));
229 ✗ return AVERROR_INVALIDDATA;
230 }
231 }
232 ✗ return AVERROR_EOF;
233 }
234
235 const FFInputFormat ff_dxa_demuxer = {
236 .p.name = "dxa",
237 .p.long_name = NULL_IF_CONFIG_SMALL("DXA"),
238 .priv_data_size = sizeof(DXAContext),
239 .read_probe = dxa_probe,
240 .read_header = dxa_read_header,
241 .read_packet = dxa_read_packet,
242 };
243