2 * Cryo Interactive Entertainment HNM4 demuxer
4 * Copyright (c) 2012 David Kment
6 * This file is part of Libav.
8 * Libav 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.
13 * Libav 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.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #include "libavutil/intreadwrite.h"
29 #define HNM4_TAG MKTAG('H', 'N', 'M', '4')
31 #define HNM4_SAMPLE_RATE 22050
32 #define HNM4_FRAME_FPS 24
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
39 typedef struct Hnm4DemuxContext {
49 uint32_t currentframe;
51 uint32_t superchunk_remaining;
55 static int hnm_probe(AVProbeData *p)
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;
68 static int hnm_read_header(AVFormatContext *s)
70 Hnm4DemuxContext *hnm = s->priv_data;
71 AVIOContext *pb = s->pb;
74 /* default context members */
76 av_init_packet(&hnm->vpkt);
77 hnm->vpkt.data = NULL;
80 hnm->superchunk_remaining = 0;
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);
93 hnm->currentframe = 0;
95 if (hnm->width < 320 || 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;
102 // TODO: find a better way to detect HNM4A
103 if (hnm->width == 640)
108 if (!(vst = avformat_new_stream(s, NULL)))
109 return AVERROR(ENOMEM);
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);
118 vst->codec->extradata_size = 1;
119 memcpy(vst->codec->extradata, &hnm->version, 1);
123 avpriv_set_pts_info(vst, 33, 1, HNM4_FRAME_FPS);
128 static int hnm_read_packet(AVFormatContext *s, AVPacket *pkt)
130 Hnm4DemuxContext *hnm = s->priv_data;
131 AVIOContext *pb = s->pb;
134 uint32_t superchunk_size, chunk_size;
137 if (hnm->currentframe == hnm->frames || pb->eof_reached)
140 if (hnm->superchunk_remaining == 0) {
141 /* parse next superchunk */
142 superchunk_size = avio_rl24(pb);
145 hnm->superchunk_remaining = superchunk_size - 4;
148 chunk_size = avio_rl24(pb);
150 chunk_id = avio_rl16(pb);
153 if (chunk_size > hnm->superchunk_remaining) {
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;
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)
172 case HNM4_CHUNK_ID_SD:
173 avio_skip(pb, chunk_size - 8);
174 hnm->superchunk_remaining -= chunk_size;
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;
188 static int hnm_read_close(AVFormatContext *s)
190 Hnm4DemuxContext *hnm = s->priv_data;
192 if (hnm->vpkt.size > 0)
193 av_packet_unref(&hnm->vpkt);
198 AVInputFormat ff_hnm_demuxer = {
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