FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/dxa.c
Date: 2024-04-23 06:12:56
Exec Total Coverage
Lines: 114 138 82.6%
Functions: 3 3 100.0%
Branches: 51 86 59.3%
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 7125 static int dxa_probe(const AVProbeData *p)
42 {
43 int w, h;
44
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 7125 if (p->buf_size < 15)
45 ✗ return 0;
46 7125 w = AV_RB16(p->buf + 11);
47 7125 h = AV_RB16(p->buf + 13);
48 /* check file header */
49
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 7125 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 7122 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(ast->codecpar->block_align) {
124
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 2 if (c->bpc > INT_MAX - ast->codecpar->block_align + 1)
125 ✗ return AVERROR_INVALIDDATA;
126 2 c->bpc = ((c->bpc - 1 + ast->codecpar->block_align) / ast->codecpar->block_align) * ast->codecpar->block_align;
127 }
128 2 c->bytes_left = fsize;
129 2 c->wavpos = avio_tell(pb);
130 2 avio_seek(pb, c->vidpos, SEEK_SET);
131 }
132
133 /* now we are ready: build format streams */
134 3 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
135 3 st->codecpar->codec_id = AV_CODEC_ID_DXA;
136 3 st->codecpar->width = w;
137 3 st->codecpar->height = h;
138 3 av_reduce(&den, &num, den, num, (1UL<<31)-1);
139 3 avpriv_set_pts_info(st, 33, num, den);
140 /* flags & 0x80 means that image is interlaced,
141 * flags & 0x40 means that image has double height
142 * either way set true height
143 */
144
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 3 if(flags & 0xC0){
145 1 st->codecpar->height >>= 1;
146 }
147 3 c->readvid = !c->has_sound;
148 3 c->vidpos = avio_tell(pb);
149 3 s->start_time = 0;
150 3 s->duration = av_rescale(c->frames, AV_TIME_BASE * (int64_t)num, den);
151 3 av_log(s, AV_LOG_DEBUG, "%d frame(s)\n",c->frames);
152
153 3 return 0;
154 }
155
156 172 static int dxa_read_packet(AVFormatContext *s, AVPacket *pkt)
157 {
158 172 DXAContext *c = s->priv_data;
159 int ret;
160 uint32_t size;
161 uint8_t buf[DXA_EXTRA_SIZE], pal[768+4];
162 172 int pal_size = 0;
163
164
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 172 if(!c->readvid && c->has_sound && c->bytes_left){
165 80 c->readvid = 1;
166 80 avio_seek(s->pb, c->wavpos, SEEK_SET);
167 80 size = FFMIN(c->bytes_left, c->bpc);
168 80 ret = av_get_packet(s->pb, pkt, size);
169 80 pkt->stream_index = 1;
170
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 80 if(ret != size)
171 ✗ return AVERROR(EIO);
172 80 c->bytes_left -= size;
173 80 c->wavpos = avio_tell(s->pb);
174 80 return 0;
175 }
176 92 avio_seek(s->pb, c->vidpos, SEEK_SET);
177
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 95 while(!avio_feof(s->pb) && c->frames){
178 uint32_t tag;
179
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 95 if ((ret = avio_read(s->pb, buf, 4)) != 4) {
180 ✗ av_log(s, AV_LOG_ERROR, "failed reading chunk type\n");
181 ✗ return ret < 0 ? ret : AVERROR_INVALIDDATA;
182 }
183 95 tag = AV_RL32(buf);
184
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 95 switch (tag) {
185 44 case MKTAG('N', 'U', 'L', 'L'):
186
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 44 if ((ret = av_new_packet(pkt, 4 + pal_size)) < 0)
187 92 return ret;
188 44 pkt->stream_index = 0;
189
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 44 if(pal_size) memcpy(pkt->data, pal, pal_size);
190 44 memcpy(pkt->data + pal_size, buf, 4);
191 44 c->frames--;
192 44 c->vidpos = avio_tell(s->pb);
193 44 c->readvid = 0;
194 44 return 0;
195 3 case MKTAG('C', 'M', 'A', 'P'):
196 3 pal_size = 768+4;
197 3 memcpy(pal, buf, 4);
198 3 avio_read(s->pb, pal + 4, 768);
199 3 break;
200 48 case MKTAG('F', 'R', 'A', 'M'):
201
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 48 if ((ret = avio_read(s->pb, buf + 4, DXA_EXTRA_SIZE - 4)) != DXA_EXTRA_SIZE - 4) {
202 ✗ av_log(s, AV_LOG_ERROR, "failed reading dxa_extra\n");
203 ✗ return ret < 0 ? ret : AVERROR_INVALIDDATA;
204 }
205 48 size = AV_RB32(buf + 5);
206
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 48 if(size > 0xFFFFFF){
207 ✗ av_log(s, AV_LOG_ERROR, "Frame size is too big: %"PRIu32"\n",
208 size);
209 ✗ return AVERROR_INVALIDDATA;
210 }
211 48 ret = av_new_packet(pkt, size + DXA_EXTRA_SIZE + pal_size);
212
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 48 if (ret < 0)
213 ✗ return ret;
214 48 memcpy(pkt->data + pal_size, buf, DXA_EXTRA_SIZE);
215 48 ret = avio_read(s->pb, pkt->data + DXA_EXTRA_SIZE + pal_size, size);
216
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 48 if(ret != size){
217 2 return AVERROR(EIO);
218 }
219
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 46 if(pal_size) memcpy(pkt->data, pal, pal_size);
220 46 pkt->stream_index = 0;
221 46 c->frames--;
222 46 c->vidpos = avio_tell(s->pb);
223 46 c->readvid = 0;
224 46 return 0;
225 ✗ default:
226 ✗ av_log(s, AV_LOG_ERROR, "Unknown tag %s\n", av_fourcc2str(tag));
227 ✗ return AVERROR_INVALIDDATA;
228 }
229 }
230 ✗ return AVERROR_EOF;
231 }
232
233 const FFInputFormat ff_dxa_demuxer = {
234 .p.name = "dxa",
235 .p.long_name = NULL_IF_CONFIG_SMALL("DXA"),
236 .priv_data_size = sizeof(DXAContext),
237 .read_probe = dxa_probe,
238 .read_header = dxa_read_header,
239 .read_packet = dxa_read_packet,
240 };
241