| 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 | }; |