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2ba45a60 DM |
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 "internal.h" | |
28 | ||
29 | #define HNM4_TAG MKTAG('H', 'N', 'M', '4') | |
30 | ||
31 | #define HNM4_SAMPLE_RATE 22050 | |
32 | #define HNM4_FRAME_FPS 24 | |
33 | ||
34 | #define HNM4_CHUNK_ID_PL 19536 | |
35 | #define HNM4_CHUNK_ID_IZ 23113 | |
36 | #define HNM4_CHUNK_ID_IU 21833 | |
37 | #define HNM4_CHUNK_ID_SD 17491 | |
38 | ||
39 | typedef struct Hnm4DemuxContext { | |
40 | uint8_t version; | |
41 | uint16_t width; | |
42 | uint16_t height; | |
43 | uint32_t filesize; | |
44 | uint32_t frames; | |
45 | uint32_t taboffset; | |
46 | uint16_t bits; | |
47 | uint16_t channels; | |
48 | uint32_t framesize; | |
49 | uint32_t currentframe; | |
50 | int64_t pts; | |
51 | uint32_t superchunk_remaining; | |
52 | AVPacket vpkt; | |
53 | } Hnm4DemuxContext; | |
54 | ||
55 | static int hnm_probe(AVProbeData *p) | |
56 | { | |
57 | if (p->buf_size < 4) | |
58 | return 0; | |
59 | ||
60 | // check for HNM4 header. | |
61 | // currently only HNM v4/v4A is supported | |
62 | if (AV_RL32(&p->buf[0]) == HNM4_TAG) | |
63 | return AVPROBE_SCORE_MAX; | |
64 | ||
65 | return 0; | |
66 | } | |
67 | ||
68 | static int hnm_read_header(AVFormatContext *s) | |
69 | { | |
70 | Hnm4DemuxContext *hnm = s->priv_data; | |
71 | AVIOContext *pb = s->pb; | |
72 | AVStream *vst; | |
73 | ||
74 | /* default context members */ | |
75 | hnm->pts = 0; | |
76 | av_init_packet(&hnm->vpkt); | |
77 | hnm->vpkt.data = NULL; | |
78 | hnm->vpkt.size = 0; | |
79 | ||
80 | hnm->superchunk_remaining = 0; | |
81 | ||
82 | avio_skip(pb, 8); | |
83 | hnm->width = avio_rl16(pb); | |
84 | hnm->height = avio_rl16(pb); | |
85 | hnm->filesize = avio_rl32(pb); | |
86 | hnm->frames = avio_rl32(pb); | |
87 | hnm->taboffset = avio_rl32(pb); | |
88 | hnm->bits = avio_rl16(pb); | |
89 | hnm->channels = avio_rl16(pb); | |
90 | hnm->framesize = avio_rl32(pb); | |
91 | avio_skip(pb, 32); | |
92 | ||
93 | hnm->currentframe = 0; | |
94 | ||
95 | if (hnm->width < 256 || hnm->width > 640 || | |
96 | hnm->height < 150 || hnm->height > 480) { | |
97 | av_log(s, AV_LOG_ERROR, | |
98 | "invalid resolution: %ux%u\n", hnm->width, hnm->height); | |
99 | return AVERROR_INVALIDDATA; | |
100 | } | |
101 | ||
102 | // TODO: find a better way to detect HNM4A | |
103 | if (hnm->width == 640) | |
104 | hnm->version = 0x4a; | |
105 | else | |
106 | hnm->version = 0x40; | |
107 | ||
108 | if (!(vst = avformat_new_stream(s, NULL))) | |
109 | return AVERROR(ENOMEM); | |
110 | ||
111 | vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
112 | vst->codec->codec_id = AV_CODEC_ID_HNM4_VIDEO; | |
113 | vst->codec->codec_tag = 0; | |
114 | vst->codec->width = hnm->width; | |
115 | vst->codec->height = hnm->height; | |
116 | vst->codec->extradata = av_mallocz(1); | |
117 | ||
118 | vst->codec->extradata_size = 1; | |
119 | memcpy(vst->codec->extradata, &hnm->version, 1); | |
120 | ||
121 | vst->start_time = 0; | |
122 | ||
123 | avpriv_set_pts_info(vst, 33, 1, HNM4_FRAME_FPS); | |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
128 | static int hnm_read_packet(AVFormatContext *s, AVPacket *pkt) | |
129 | { | |
130 | Hnm4DemuxContext *hnm = s->priv_data; | |
131 | AVIOContext *pb = s->pb; | |
132 | int ret = 0; | |
133 | ||
134 | uint32_t superchunk_size, chunk_size; | |
135 | uint16_t chunk_id; | |
136 | ||
137 | if (hnm->currentframe == hnm->frames || pb->eof_reached) | |
138 | return AVERROR_EOF; | |
139 | ||
140 | if (hnm->superchunk_remaining == 0) { | |
141 | /* parse next superchunk */ | |
142 | superchunk_size = avio_rl24(pb); | |
143 | avio_skip(pb, 1); | |
144 | ||
145 | hnm->superchunk_remaining = superchunk_size - 4; | |
146 | } | |
147 | ||
148 | chunk_size = avio_rl24(pb); | |
149 | avio_skip(pb, 1); | |
150 | chunk_id = avio_rl16(pb); | |
151 | avio_skip(pb, 2); | |
152 | ||
153 | if (chunk_size > hnm->superchunk_remaining || !chunk_size) { | |
154 | av_log(s, AV_LOG_ERROR, | |
155 | "invalid chunk size: %"PRIu32", offset: %"PRId64"\n", | |
156 | chunk_size, avio_tell(pb)); | |
157 | avio_skip(pb, hnm->superchunk_remaining - 8); | |
158 | hnm->superchunk_remaining = 0; | |
159 | } | |
160 | ||
161 | switch (chunk_id) { | |
162 | case HNM4_CHUNK_ID_PL: | |
163 | case HNM4_CHUNK_ID_IZ: | |
164 | case HNM4_CHUNK_ID_IU: | |
165 | avio_seek(pb, -8, SEEK_CUR); | |
166 | ret += av_get_packet(pb, pkt, chunk_size); | |
167 | hnm->superchunk_remaining -= chunk_size; | |
168 | if (chunk_id == HNM4_CHUNK_ID_IZ || chunk_id == HNM4_CHUNK_ID_IU) | |
169 | hnm->currentframe++; | |
170 | break; | |
171 | ||
172 | case HNM4_CHUNK_ID_SD: | |
173 | avio_skip(pb, chunk_size - 8); | |
174 | hnm->superchunk_remaining -= chunk_size; | |
175 | break; | |
176 | ||
177 | default: | |
178 | av_log(s, AV_LOG_WARNING, "unknown chunk found: %"PRIu16", offset: %"PRId64"\n", | |
179 | chunk_id, avio_tell(pb)); | |
180 | avio_skip(pb, chunk_size - 8); | |
181 | hnm->superchunk_remaining -= chunk_size; | |
182 | break; | |
183 | } | |
184 | ||
185 | return ret; | |
186 | } | |
187 | ||
188 | static int hnm_read_close(AVFormatContext *s) | |
189 | { | |
190 | Hnm4DemuxContext *hnm = s->priv_data; | |
191 | ||
192 | if (hnm->vpkt.size > 0) | |
193 | av_free_packet(&hnm->vpkt); | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | AVInputFormat ff_hnm_demuxer = { | |
199 | .name = "hnm", | |
200 | .long_name = NULL_IF_CONFIG_SMALL("Cryo HNM v4"), | |
201 | .priv_data_size = sizeof(Hnm4DemuxContext), | |
202 | .read_probe = hnm_probe, | |
203 | .read_header = hnm_read_header, | |
204 | .read_packet = hnm_read_packet, | |
205 | .read_close = hnm_read_close, | |
206 | .flags = AVFMT_NO_BYTE_SEEK | AVFMT_NOGENSEARCH | AVFMT_NOBINSEARCH | |
207 | }; |