1 /*
2 * Copyright © 2018, VideoLAN and dav1d authors
3 * Copyright © 2018, Two Orioles, LLC
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright notice, this
10 * list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright notice,
13 * this list of conditions and the following disclaimer in the documentation
14 * and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "config.h"
29
30 #include <errno.h>
31 #include <limits.h>
32 #include <math.h>
33 #include <stdio.h>
34 #include <stdint.h>
35 #include <stdlib.h>
36 #include <string.h>
37
38 #include "input/demuxer.h"
39
40 typedef struct DemuxerPriv {
41 FILE *f;
42 int broken;
43 double timebase;
44 uint64_t last_ts;
45 uint64_t step;
46 } IvfInputContext;
47
48 static const uint8_t probe_data[] = {
49 'D', 'K', 'I', 'F',
50 0, 0, 0x20, 0,
51 'A', 'V', '0', '1',
52 };
53
ivf_probe(const uint8_t * const data)54 static int ivf_probe(const uint8_t *const data) {
55 return !memcmp(data, probe_data, sizeof(probe_data));
56 }
57
rl32(const uint8_t * const p)58 static unsigned rl32(const uint8_t *const p) {
59 return ((uint32_t)p[3] << 24U) | (p[2] << 16U) | (p[1] << 8U) | p[0];
60 }
61
rl64(const uint8_t * const p)62 static int64_t rl64(const uint8_t *const p) {
63 return (((uint64_t) rl32(&p[4])) << 32) | rl32(p);
64 }
65
ivf_open(IvfInputContext * const c,const char * const file,unsigned fps[2],unsigned * const num_frames,unsigned timebase[2])66 static int ivf_open(IvfInputContext *const c, const char *const file,
67 unsigned fps[2], unsigned *const num_frames, unsigned timebase[2])
68 {
69 uint8_t hdr[32];
70
71 if (!(c->f = fopen(file, "rb"))) {
72 fprintf(stderr, "Failed to open %s: %s\n", file, strerror(errno));
73 return -1;
74 } else if (fread(hdr, 32, 1, c->f) != 1) {
75 fprintf(stderr, "Failed to read stream header: %s\n", strerror(errno));
76 fclose(c->f);
77 return -1;
78 } else if (memcmp(hdr, "DKIF", 4)) {
79 fprintf(stderr, "%s is not an IVF file [tag=%.4s|0x%02x%02x%02x%02x]\n",
80 file, hdr, hdr[0], hdr[1], hdr[2], hdr[3]);
81 fclose(c->f);
82 return -1;
83 } else if (memcmp(&hdr[8], "AV01", 4)) {
84 fprintf(stderr, "%s is not an AV1 file [tag=%.4s|0x%02x%02x%02x%02x]\n",
85 file, &hdr[8], hdr[8], hdr[9], hdr[10], hdr[11]);
86 fclose(c->f);
87 return -1;
88 }
89
90 timebase[0] = rl32(&hdr[16]);
91 timebase[1] = rl32(&hdr[20]);
92 const unsigned duration = rl32(&hdr[24]);
93
94 uint8_t data[8];
95 c->broken = 0;
96 for (*num_frames = 0;; (*num_frames)++) {
97 if (fread(data, 4, 1, c->f) != 1) break; // EOF
98 size_t sz = rl32(data);
99 if (fread(data, 8, 1, c->f) != 1) break; // EOF
100 const uint64_t ts = rl64(data);
101 if (*num_frames && ts <= c->last_ts)
102 c->broken = 1;
103 c->last_ts = ts;
104 fseeko(c->f, sz, SEEK_CUR);
105 }
106
107 uint64_t fps_num = (uint64_t) timebase[0] * *num_frames;
108 uint64_t fps_den = (uint64_t) timebase[1] * duration;
109 if (fps_num && fps_den) { /* Reduce fraction */
110 uint64_t gcd = fps_num;
111 for (uint64_t a = fps_den, b; (b = a % gcd); a = gcd, gcd = b);
112 fps_num /= gcd;
113 fps_den /= gcd;
114
115 while ((fps_num | fps_den) > UINT_MAX) {
116 fps_num >>= 1;
117 fps_den >>= 1;
118 }
119 }
120 if (fps_num && fps_den) {
121 fps[0] = (unsigned) fps_num;
122 fps[1] = (unsigned) fps_den;
123 } else {
124 fps[0] = fps[1] = 0;
125 }
126 c->timebase = (double)timebase[0] / timebase[1];
127 c->step = duration / *num_frames;
128
129 fseeko(c->f, 32, SEEK_SET);
130 c->last_ts = 0;
131
132 return 0;
133 }
134
ivf_read_header(IvfInputContext * const c,ptrdiff_t * const sz,int64_t * const off_,uint64_t * const ts)135 static inline int ivf_read_header(IvfInputContext *const c, ptrdiff_t *const sz,
136 int64_t *const off_, uint64_t *const ts)
137 {
138 uint8_t data[8];
139 int64_t const off = ftello(c->f);
140 if (off_) *off_ = off;
141 if (fread(data, 4, 1, c->f) != 1) return -1; // EOF
142 *sz = rl32(data);
143 if (!c->broken) {
144 if (fread(data, 8, 1, c->f) != 1) return -1;
145 *ts = rl64(data);
146 } else {
147 if (fseeko(c->f, 8, SEEK_CUR)) return -1;
148 *ts = off > 32 ? c->last_ts + c->step : 0;
149 }
150 return 0;
151 }
152
ivf_read(IvfInputContext * const c,Dav1dData * const buf)153 static int ivf_read(IvfInputContext *const c, Dav1dData *const buf) {
154 uint8_t *ptr;
155 ptrdiff_t sz;
156 int64_t off;
157 uint64_t ts;
158 if (ivf_read_header(c, &sz, &off, &ts)) return -1;
159 if (!(ptr = dav1d_data_create(buf, sz))) return -1;
160 if (fread(ptr, sz, 1, c->f) != 1) {
161 fprintf(stderr, "Failed to read frame data: %s\n", strerror(errno));
162 dav1d_data_unref(buf);
163 return -1;
164 }
165 buf->m.offset = off;
166 buf->m.timestamp = ts;
167 c->last_ts = ts;
168 return 0;
169 }
170
ivf_seek(IvfInputContext * const c,const uint64_t pts)171 static int ivf_seek(IvfInputContext *const c, const uint64_t pts) {
172 uint64_t cur;
173 const uint64_t ts = llround((pts * c->timebase) / 1000000000.0);
174 if (ts <= c->last_ts)
175 if (fseeko(c->f, 32, SEEK_SET)) goto error;
176 while (1) {
177 ptrdiff_t sz;
178 if (ivf_read_header(c, &sz, NULL, &cur)) goto error;
179 if (cur >= ts) break;
180 if (fseeko(c->f, sz, SEEK_CUR)) goto error;
181 c->last_ts = cur;
182 }
183 if (fseeko(c->f, -12, SEEK_CUR)) goto error;
184 return 0;
185 error:
186 fprintf(stderr, "Failed to seek: %s\n", strerror(errno));
187 return -1;
188 }
189
ivf_close(IvfInputContext * const c)190 static void ivf_close(IvfInputContext *const c) {
191 fclose(c->f);
192 }
193
194 const Demuxer ivf_demuxer = {
195 .priv_data_size = sizeof(IvfInputContext),
196 .name = "ivf",
197 .probe = ivf_probe,
198 .probe_sz = sizeof(probe_data),
199 .open = ivf_open,
200 .read = ivf_read,
201 .seek = ivf_seek,
202 .close = ivf_close,
203 };
204