FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/dxa.c
Date: 2025-02-01 04:38:32
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 "demux.h"
27 #include "internal.h"
28 #include "riff.h"
29
30 #define DXA_EXTRA_SIZE 9
31
32 typedef struct DXAContext {
33 int frames;
34 int has_sound;
35 int bpc;
36 uint32_t bytes_left;
37 int64_t wavpos, vidpos;
38 int readvid;
39 }DXAContext;
40
41 7203 static int dxa_probe(const AVProbeData *p)
42 {
43 int w, h;
44
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 7203 if (p->buf_size < 15)
45 ✗ return 0;
46 7203 w = AV_RB16(p->buf + 11);
47 7203 h = AV_RB16(p->buf + 13);
48 /* check file header */
49
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 7203 if (p->buf[0] == 'D' && p->buf[1] == 'E' &&
50
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 3 p->buf[2] == 'X' && p->buf[3] == 'A' &&
51
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 3 w && w <= 2048 && h && h <= 2048)
52 3 return AVPROBE_SCORE_MAX;
53 else
54 7200 return 0;
55 }
56
57 3 static int dxa_read_header(AVFormatContext *s)
58 {
59 3 AVIOContext *pb = s->pb;
60 3 DXAContext *c = s->priv_data;
61 AVStream *st, *ast;
62 uint32_t tag;
63 int32_t fps;
64 int w, h;
65 int num, den;
66 int flags;
67 int ret;
68
69 3 tag = avio_rl32(pb);
70
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 3 if (tag != MKTAG('D', 'E', 'X', 'A'))
71 ✗ return AVERROR_INVALIDDATA;
72 3 flags = avio_r8(pb);
73 3 c->frames = avio_rb16(pb);
74
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 3 if(!c->frames){
75 ✗ av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");
76 ✗ return AVERROR_INVALIDDATA;
77 }
78
79 3 fps = avio_rb32(pb);
80
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 3 if(fps > 0){
81 ✗ den = 1000;
82 ✗ num = fps;
83
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 3 }else if (fps < 0 && fps > INT_MIN){
84 3 den = 100000;
85 3 num = -fps;
86 }else{
87 ✗ den = 10;
88 ✗ num = 1;
89 }
90 3 w = avio_rb16(pb);
91 3 h = avio_rb16(pb);
92 3 c->has_sound = 0;
93
94 3 st = avformat_new_stream(s, NULL);
95
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 3 if (!st)
96 ✗ return AVERROR(ENOMEM);
97
98 // Parse WAV data header
99
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 3 if(avio_rl32(pb) == MKTAG('W', 'A', 'V', 'E')){
100 uint32_t size, fsize;
101 2 c->has_sound = 1;
102 2 size = avio_rb32(pb);
103 2 c->vidpos = avio_tell(pb) + size;
104 2 avio_skip(pb, 16);
105 2 fsize = avio_rl32(pb);
106
107 2 ast = avformat_new_stream(s, NULL);
108
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 2 if (!ast)
109 ✗ return AVERROR(ENOMEM);
110 2 ret = ff_get_wav_header(s, pb, ast->codecpar, fsize, 0);
111
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 2 if (ret < 0)
112 ✗ return ret;
113
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 2 if (ast->codecpar->sample_rate > 0)
114 2 avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
115 // find 'data' chunk
116
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 4 while(avio_tell(pb) < c->vidpos && !avio_feof(pb)){
117 4 tag = avio_rl32(pb);
118 4 fsize = avio_rl32(pb);
119
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 4 if(tag == MKTAG('d', 'a', 't', 'a')) break;
120 2 avio_skip(pb, fsize);
121 }
122 2 c->bpc = (fsize + (int64_t)c->frames - 1) / c->frames;
123
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 2 if (c->bpc < 0)
124 ✗ return AVERROR_INVALIDDATA;
125
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 2 if(ast->codecpar->block_align) {
126
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 2 if (c->bpc > INT_MAX - ast->codecpar->block_align + 1)
127 ✗ return AVERROR_INVALIDDATA;
128 2 c->bpc = ((c->bpc - 1 + ast->codecpar->block_align) / ast->codecpar->block_align) * ast->codecpar->block_align;
129 }
130 2 c->bytes_left = fsize;
131 2 c->wavpos = avio_tell(pb);
132 2 avio_seek(pb, c->vidpos, SEEK_SET);
133 }
134
135 /* now we are ready: build format streams */
136 3 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
137 3 st->codecpar->codec_id = AV_CODEC_ID_DXA;
138 3 st->codecpar->width = w;
139 3 st->codecpar->height = h;
140 3 av_reduce(&den, &num, den, num, (1UL<<31)-1);
141 3 avpriv_set_pts_info(st, 33, num, den);
142 /* flags & 0x80 means that image is interlaced,
143 * flags & 0x40 means that image has double height
144 * either way set true height
145 */
146
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 3 if(flags & 0xC0){
147 1 st->codecpar->height >>= 1;
148 }
149 3 c->readvid = !c->has_sound;
150 3 c->vidpos = avio_tell(pb);
151 3 s->start_time = 0;
152 3 s->duration = av_rescale(c->frames, AV_TIME_BASE * (int64_t)num, den);
153 3 av_log(s, AV_LOG_DEBUG, "%d frame(s)\n",c->frames);
154
155 3 return 0;
156 }
157
158 172 static int dxa_read_packet(AVFormatContext *s, AVPacket *pkt)
159 {
160 172 DXAContext *c = s->priv_data;
161 int ret;
162 uint32_t size;
163 uint8_t buf[DXA_EXTRA_SIZE], pal[768+4];
164 172 int pal_size = 0;
165
166
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 172 if(!c->readvid && c->has_sound && c->bytes_left){
167 80 c->readvid = 1;
168 80 avio_seek(s->pb, c->wavpos, SEEK_SET);
169 80 size = FFMIN(c->bytes_left, c->bpc);
170 80 ret = av_get_packet(s->pb, pkt, size);
171 80 pkt->stream_index = 1;
172
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 80 if(ret != size)
173 ✗ return AVERROR(EIO);
174 80 c->bytes_left -= size;
175 80 c->wavpos = avio_tell(s->pb);
176 80 return 0;
177 }
178 92 avio_seek(s->pb, c->vidpos, SEEK_SET);
179
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 95 while(!avio_feof(s->pb) && c->frames){
180 uint32_t tag;
181
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 95 if ((ret = avio_read(s->pb, buf, 4)) != 4) {
182 ✗ av_log(s, AV_LOG_ERROR, "failed reading chunk type\n");
183 ✗ return ret < 0 ? ret : AVERROR_INVALIDDATA;
184 }
185 95 tag = AV_RL32(buf);
186
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 95 switch (tag) {
187 44 case MKTAG('N', 'U', 'L', 'L'):
188
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 44 if ((ret = av_new_packet(pkt, 4 + pal_size)) < 0)
189 92 return ret;
190 44 pkt->stream_index = 0;
191
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 44 if(pal_size) memcpy(pkt->data, pal, pal_size);
192 44 memcpy(pkt->data + pal_size, buf, 4);
193 44 c->frames--;
194 44 c->vidpos = avio_tell(s->pb);
195 44 c->readvid = 0;
196 44 return 0;
197 3 case MKTAG('C', 'M', 'A', 'P'):
198 3 pal_size = 768+4;
199 3 memcpy(pal, buf, 4);
200 3 avio_read(s->pb, pal + 4, 768);
201 3 break;
202 48 case MKTAG('F', 'R', 'A', 'M'):
203
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 48 if ((ret = avio_read(s->pb, buf + 4, DXA_EXTRA_SIZE - 4)) != DXA_EXTRA_SIZE - 4) {
204 ✗ av_log(s, AV_LOG_ERROR, "failed reading dxa_extra\n");
205 ✗ return ret < 0 ? ret : AVERROR_INVALIDDATA;
206 }
207 48 size = AV_RB32(buf + 5);
208
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 48 if(size > 0xFFFFFF){
209 ✗ av_log(s, AV_LOG_ERROR, "Frame size is too big: %"PRIu32"\n",
210 size);
211 ✗ return AVERROR_INVALIDDATA;
212 }
213 48 ret = av_new_packet(pkt, size + DXA_EXTRA_SIZE + pal_size);
214
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 48 if (ret < 0)
215 ✗ return ret;
216 48 memcpy(pkt->data + pal_size, buf, DXA_EXTRA_SIZE);
217 48 ret = avio_read(s->pb, pkt->data + DXA_EXTRA_SIZE + pal_size, size);
218
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 48 if(ret != size){
219 2 return AVERROR(EIO);
220 }
221
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 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