FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/hnm.c
Date: 2024-04-24 18:52:15
Exec Total Coverage
Lines: 4 68 5.9%
Functions: 1 3 33.3%
Branches: 2 35 5.7%
Line Branch Exec Source
1 /*
2 * Cryo Interactive Entertainment HNM4 demuxer
3 *
4 * Copyright (c) 2012 David Kment
5 *
6 * This file is part of FFmpeg .
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg ; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include <inttypes.h>
24
25 #include "libavutil/intreadwrite.h"
26 #include "avformat.h"
27 #include "demux.h"
28 #include "internal.h"
29
30 #define HNM4_TAG MKTAG('H', 'N', 'M', '4')
31
32 #define HNM4_SAMPLE_RATE 22050
33 #define HNM4_FRAME_FPS 24
34
35 #define HNM4_CHUNK_ID_PL 19536
36 #define HNM4_CHUNK_ID_IZ 23113
37 #define HNM4_CHUNK_ID_IU 21833
38 #define HNM4_CHUNK_ID_SD 17491
39
40 typedef struct Hnm4DemuxContext {
41 uint32_t frames;
42 uint32_t currentframe;
43 uint32_t superchunk_remaining;
44 } Hnm4DemuxContext;
45
46 7127 static int hnm_probe(const AVProbeData *p)
47 {
48
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 7127 times.
 7127 if (p->buf_size < 4)
49 ✗ return 0;
50
51 // check for HNM4 header.
52 // currently only HNM v4/v4A is supported
53
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 7127 times.
 7127 if (AV_RL32(&p->buf[0]) == HNM4_TAG)
54 ✗ return AVPROBE_SCORE_MAX;
55
56 7127 return 0;
57 }
58
59 ✗ static int hnm_read_header(AVFormatContext *s)
60 {
61 ✗ Hnm4DemuxContext *hnm = s->priv_data;
62 ✗ AVIOContext *pb = s->pb;
63 unsigned width, height;
64 AVStream *vst;
65 int ret;
66
67 ✗ avio_skip(pb, 8);
68 ✗ width = avio_rl16(pb);
69 ✗ height = avio_rl16(pb);
70 ✗ avio_rl32(pb); // filesize
71 ✗ hnm->frames = avio_rl32(pb);
72 ✗ avio_skip(pb, 44);
73
74 ✗ if (width < 256 || width > 640 ||
75 ✗ height < 150 || height > 480) {
76 ✗ av_log(s, AV_LOG_ERROR,
77 "invalid resolution: %ux%u\n", width, height);
78 ✗ return AVERROR_INVALIDDATA;
79 }
80
81 ✗ if (!(vst = avformat_new_stream(s, NULL)))
82 ✗ return AVERROR(ENOMEM);
83
84 ✗ vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
85 ✗ vst->codecpar->codec_id = AV_CODEC_ID_HNM4_VIDEO;
86 ✗ vst->codecpar->codec_tag = 0;
87 ✗ vst->codecpar->width = width;
88 ✗ vst->codecpar->height = height;
89 ✗ if ((ret = ff_alloc_extradata(vst->codecpar, 1)) < 0)
90 ✗ return ret;
91
92 // TODO: find a better way to detect HNM4A
93 ✗ vst->codecpar->extradata[0] = width == 640 ? 0x4a : 0x40;
94
95 ✗ vst->start_time = 0;
96
97 ✗ avpriv_set_pts_info(vst, 33, 1, HNM4_FRAME_FPS);
98
99 ✗ return 0;
100 }
101
102 ✗ static int hnm_read_packet(AVFormatContext *s, AVPacket *pkt)
103 {
104 ✗ Hnm4DemuxContext *hnm = s->priv_data;
105 ✗ AVIOContext *pb = s->pb;
106 ✗ int ret = 0;
107
108 uint32_t superchunk_size, chunk_size;
109 uint16_t chunk_id;
110
111 ✗ if (hnm->currentframe == hnm->frames || pb->eof_reached)
112 ✗ return AVERROR_EOF;
113
114 ✗ if (hnm->superchunk_remaining == 0) {
115 /* parse next superchunk */
116 ✗ superchunk_size = avio_rl24(pb);
117 ✗ avio_skip(pb, 1);
118
119 ✗ hnm->superchunk_remaining = superchunk_size - 4;
120 }
121
122 ✗ chunk_size = avio_rl24(pb);
123 ✗ avio_skip(pb, 1);
124 ✗ chunk_id = avio_rl16(pb);
125 ✗ avio_skip(pb, 2);
126
127 ✗ if (chunk_size > hnm->superchunk_remaining || !chunk_size) {
128 ✗ av_log(s, AV_LOG_ERROR,
129 "invalid chunk size: %"PRIu32", offset: %"PRId64"\n",
130 chunk_size, avio_tell(pb));
131 ✗ avio_skip(pb, hnm->superchunk_remaining - 8);
132 ✗ hnm->superchunk_remaining = 0;
133 }
134
135 ✗ switch (chunk_id) {
136 ✗ case HNM4_CHUNK_ID_PL:
137 case HNM4_CHUNK_ID_IZ:
138 case HNM4_CHUNK_ID_IU:
139 ✗ avio_seek(pb, -8, SEEK_CUR);
140 ✗ ret += av_get_packet(pb, pkt, chunk_size);
141 ✗ hnm->superchunk_remaining -= chunk_size;
142 ✗ if (chunk_id == HNM4_CHUNK_ID_IZ || chunk_id == HNM4_CHUNK_ID_IU)
143 ✗ hnm->currentframe++;
144 ✗ break;
145
146 ✗ case HNM4_CHUNK_ID_SD:
147 ✗ avio_skip(pb, chunk_size - 8);
148 ✗ hnm->superchunk_remaining -= chunk_size;
149 ✗ break;
150
151 ✗ default:
152 ✗ av_log(s, AV_LOG_WARNING, "unknown chunk found: %"PRIu16", offset: %"PRId64"\n",
153 chunk_id, avio_tell(pb));
154 ✗ avio_skip(pb, chunk_size - 8);
155 ✗ hnm->superchunk_remaining -= chunk_size;
156 ✗ break;
157 }
158
159 ✗ return ret;
160 }
161
162 const FFInputFormat ff_hnm_demuxer = {
163 .p.name = "hnm",
164 .p.long_name = NULL_IF_CONFIG_SMALL("Cryo HNM v4"),
165 .p.flags = AVFMT_NO_BYTE_SEEK | AVFMT_NOGENSEARCH | AVFMT_NOBINSEARCH,
166 .priv_data_size = sizeof(Hnm4DemuxContext),
167 .read_probe = hnm_probe,
168 .read_header = hnm_read_header,
169 .read_packet = hnm_read_packet,
170 };
171