FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/dxa.c
Date: 2022-12-05 03:11:11
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 "internal.h"
27 #include "riff.h"
28
29 #define DXA_EXTRA_SIZE 9
30
31 typedef struct DXAContext {
32 int frames;
33 int has_sound;
34 int bpc;
35 uint32_t bytes_left;
36 int64_t wavpos, vidpos;
37 int readvid;
38 }DXAContext;
39
40 6782 static int dxa_probe(const AVProbeData *p)
41 {
42 int w, h;
43
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6782 if (p->buf_size < 15)
44 return 0;
45 6782 w = AV_RB16(p->buf + 11);
46 6782 h = AV_RB16(p->buf + 13);
47 /* check file header */
48
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6782 if (p->buf[0] == 'D' && p->buf[1] == 'E' &&
49
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3 p->buf[2] == 'X' && p->buf[3] == 'A' &&
50
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3 w && w <= 2048 && h && h <= 2048)
51 3 return AVPROBE_SCORE_MAX;
52 else
53 6779 return 0;
54 }
55
56 3 static int dxa_read_header(AVFormatContext *s)
57 {
58 3 AVIOContext *pb = s->pb;
59 3 DXAContext *c = s->priv_data;
60 AVStream *st, *ast;
61 uint32_t tag;
62 int32_t fps;
63 int w, h;
64 int num, den;
65 int flags;
66 int ret;
67
68 3 tag = avio_rl32(pb);
69
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3 if (tag != MKTAG('D', 'E', 'X', 'A'))
70 return AVERROR_INVALIDDATA;
71 3 flags = avio_r8(pb);
72 3 c->frames = avio_rb16(pb);
73
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3 if(!c->frames){
74 av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");
75 return AVERROR_INVALIDDATA;
76 }
77
78 3 fps = avio_rb32(pb);
79
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3 if(fps > 0){
80 den = 1000;
81 num = fps;
82
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3 }else if (fps < 0 && fps > INT_MIN){
83 3 den = 100000;
84 3 num = -fps;
85 }else{
86 den = 10;
87 num = 1;
88 }
89 3 w = avio_rb16(pb);
90 3 h = avio_rb16(pb);
91 3 c->has_sound = 0;
92
93 3 st = avformat_new_stream(s, NULL);
94
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3 if (!st)
95 return AVERROR(ENOMEM);
96
97 // Parse WAV data header
98
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3 if(avio_rl32(pb) == MKTAG('W', 'A', 'V', 'E')){
99 uint32_t size, fsize;
100 2 c->has_sound = 1;
101 2 size = avio_rb32(pb);
102 2 c->vidpos = avio_tell(pb) + size;
103 2 avio_skip(pb, 16);
104 2 fsize = avio_rl32(pb);
105
106 2 ast = avformat_new_stream(s, NULL);
107
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2 if (!ast)
108 return AVERROR(ENOMEM);
109 2 ret = ff_get_wav_header(s, pb, ast->codecpar, fsize, 0);
110
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2 if (ret < 0)
111 return ret;
112
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2 if (ast->codecpar->sample_rate > 0)
113 2 avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
114 // find 'data' chunk
115
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4 while(avio_tell(pb) < c->vidpos && !avio_feof(pb)){
116 4 tag = avio_rl32(pb);
117 4 fsize = avio_rl32(pb);
118
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4 if(tag == MKTAG('d', 'a', 't', 'a')) break;
119 2 avio_skip(pb, fsize);
120 }
121 2 c->bpc = (fsize + (int64_t)c->frames - 1) / c->frames;
122
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2 if(ast->codecpar->block_align) {
123
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2 if (c->bpc > INT_MAX - ast->codecpar->block_align + 1)
124 return AVERROR_INVALIDDATA;
125 2 c->bpc = ((c->bpc + ast->codecpar->block_align - 1) / ast->codecpar->block_align) * ast->codecpar->block_align;
126 }
127 2 c->bytes_left = fsize;
128 2 c->wavpos = avio_tell(pb);
129 2 avio_seek(pb, c->vidpos, SEEK_SET);
130 }
131
132 /* now we are ready: build format streams */
133 3 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
134 3 st->codecpar->codec_id = AV_CODEC_ID_DXA;
135 3 st->codecpar->width = w;
136 3 st->codecpar->height = h;
137 3 av_reduce(&den, &num, den, num, (1UL<<31)-1);
138 3 avpriv_set_pts_info(st, 33, num, den);
139 /* flags & 0x80 means that image is interlaced,
140 * flags & 0x40 means that image has double height
141 * either way set true height
142 */
143
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3 if(flags & 0xC0){
144 1 st->codecpar->height >>= 1;
145 }
146 3 c->readvid = !c->has_sound;
147 3 c->vidpos = avio_tell(pb);
148 3 s->start_time = 0;
149 3 s->duration = av_rescale(c->frames, AV_TIME_BASE * (int64_t)num, den);
150 3 av_log(s, AV_LOG_DEBUG, "%d frame(s)\n",c->frames);
151
152 3 return 0;
153 }
154
155 172 static int dxa_read_packet(AVFormatContext *s, AVPacket *pkt)
156 {
157 172 DXAContext *c = s->priv_data;
158 int ret;
159 uint32_t size;
160 uint8_t buf[DXA_EXTRA_SIZE], pal[768+4];
161 172 int pal_size = 0;
162
163
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172 if(!c->readvid && c->has_sound && c->bytes_left){
164 80 c->readvid = 1;
165 80 avio_seek(s->pb, c->wavpos, SEEK_SET);
166 80 size = FFMIN(c->bytes_left, c->bpc);
167 80 ret = av_get_packet(s->pb, pkt, size);
168 80 pkt->stream_index = 1;
169
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80 if(ret != size)
170 return AVERROR(EIO);
171 80 c->bytes_left -= size;
172 80 c->wavpos = avio_tell(s->pb);
173 80 return 0;
174 }
175 92 avio_seek(s->pb, c->vidpos, SEEK_SET);
176
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95 while(!avio_feof(s->pb) && c->frames){
177 uint32_t tag;
178
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95 if ((ret = avio_read(s->pb, buf, 4)) != 4) {
179 av_log(s, AV_LOG_ERROR, "failed reading chunk type\n");
180 return ret < 0 ? ret : AVERROR_INVALIDDATA;
181 }
182 95 tag = AV_RL32(buf);
183
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95 switch (tag) {
184 44 case MKTAG('N', 'U', 'L', 'L'):
185
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44 if ((ret = av_new_packet(pkt, 4 + pal_size)) < 0)
186 92 return ret;
187 44 pkt->stream_index = 0;
188
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44 if(pal_size) memcpy(pkt->data, pal, pal_size);
189 44 memcpy(pkt->data + pal_size, buf, 4);
190 44 c->frames--;
191 44 c->vidpos = avio_tell(s->pb);
192 44 c->readvid = 0;
193 44 return 0;
194 3 case MKTAG('C', 'M', 'A', 'P'):
195 3 pal_size = 768+4;
196 3 memcpy(pal, buf, 4);
197 3 avio_read(s->pb, pal + 4, 768);
198 3 break;
199 48 case MKTAG('F', 'R', 'A', 'M'):
200
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48 if ((ret = avio_read(s->pb, buf + 4, DXA_EXTRA_SIZE - 4)) != DXA_EXTRA_SIZE - 4) {
201 av_log(s, AV_LOG_ERROR, "failed reading dxa_extra\n");
202 return ret < 0 ? ret : AVERROR_INVALIDDATA;
203 }
204 48 size = AV_RB32(buf + 5);
205
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48 if(size > 0xFFFFFF){
206 av_log(s, AV_LOG_ERROR, "Frame size is too big: %"PRIu32"\n",
207 size);
208 return AVERROR_INVALIDDATA;
209 }
210 48 ret = av_new_packet(pkt, size + DXA_EXTRA_SIZE + pal_size);
211
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48 if (ret < 0)
212 return ret;
213 48 memcpy(pkt->data + pal_size, buf, DXA_EXTRA_SIZE);
214 48 ret = avio_read(s->pb, pkt->data + DXA_EXTRA_SIZE + pal_size, size);
215
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48 if(ret != size){
216 2 return AVERROR(EIO);
217 }
218
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46 if(pal_size) memcpy(pkt->data, pal, pal_size);
219 46 pkt->stream_index = 0;
220 46 c->frames--;
221 46 c->vidpos = avio_tell(s->pb);
222 46 c->readvid = 0;
223 46 return 0;
224 default:
225 av_log(s, AV_LOG_ERROR, "Unknown tag %s\n", av_fourcc2str(tag));
226 return AVERROR_INVALIDDATA;
227 }
228 }
229 return AVERROR_EOF;
230 }
231
232 const AVInputFormat ff_dxa_demuxer = {
233 .name = "dxa",
234 .long_name = NULL_IF_CONFIG_SMALL("DXA"),
235 .priv_data_size = sizeof(DXAContext),
236 .read_probe = dxa_probe,
237 .read_header = dxa_read_header,
238 .read_packet = dxa_read_packet,
239 };
240