blob: 24d4e808a543991c69b2a87df5aa885db531ae83
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->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
112 | vst->codecpar->codec_id = AV_CODEC_ID_HNM4_VIDEO; |
113 | vst->codecpar->codec_tag = 0; |
114 | vst->codecpar->width = hnm->width; |
115 | vst->codecpar->height = hnm->height; |
116 | vst->codecpar->extradata = av_mallocz(1); |
117 | |
118 | vst->codecpar->extradata_size = 1; |
119 | memcpy(vst->codecpar->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_packet_unref(&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 | }; |
208 |