| 1 | /* |
| 2 | * Sega FILM Format (CPK) Demuxer |
| 3 | * Copyright (c) 2003 The FFmpeg Project |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * Sega FILM (.cpk) file demuxer |
| 25 | * by Mike Melanson (melanson@pcisys.net) |
| 26 | * For more information regarding the Sega FILM file format, visit: |
| 27 | * http://www.pcisys.net/~melanson/codecs/ |
| 28 | */ |
| 29 | |
| 30 | #include "libavutil/intreadwrite.h" |
| 31 | #include "avformat.h" |
| 32 | #include "internal.h" |
| 33 | #include "avio_internal.h" |
| 34 | |
| 35 | #define FILM_TAG MKBETAG('F', 'I', 'L', 'M') |
| 36 | #define FDSC_TAG MKBETAG('F', 'D', 'S', 'C') |
| 37 | #define STAB_TAG MKBETAG('S', 'T', 'A', 'B') |
| 38 | #define CVID_TAG MKBETAG('c', 'v', 'i', 'd') |
| 39 | #define RAW_TAG MKBETAG('r', 'a', 'w', ' ') |
| 40 | |
| 41 | typedef struct { |
| 42 | int stream; |
| 43 | int64_t sample_offset; |
| 44 | unsigned int sample_size; |
| 45 | int64_t pts; |
| 46 | int keyframe; |
| 47 | } film_sample; |
| 48 | |
| 49 | typedef struct FilmDemuxContext { |
| 50 | int video_stream_index; |
| 51 | int audio_stream_index; |
| 52 | |
| 53 | enum AVCodecID audio_type; |
| 54 | unsigned int audio_samplerate; |
| 55 | unsigned int audio_bits; |
| 56 | unsigned int audio_channels; |
| 57 | |
| 58 | enum AVCodecID video_type; |
| 59 | unsigned int sample_count; |
| 60 | film_sample *sample_table; |
| 61 | unsigned int current_sample; |
| 62 | |
| 63 | unsigned int base_clock; |
| 64 | unsigned int version; |
| 65 | } FilmDemuxContext; |
| 66 | |
| 67 | static int film_probe(AVProbeData *p) |
| 68 | { |
| 69 | if (AV_RB32(&p->buf[0]) != FILM_TAG) |
| 70 | return 0; |
| 71 | |
| 72 | if (AV_RB32(&p->buf[16]) != FDSC_TAG) |
| 73 | return 0; |
| 74 | |
| 75 | return AVPROBE_SCORE_MAX; |
| 76 | } |
| 77 | |
| 78 | static int film_read_close(AVFormatContext *s) |
| 79 | { |
| 80 | FilmDemuxContext *film = s->priv_data; |
| 81 | |
| 82 | av_freep(&film->sample_table); |
| 83 | |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | static int film_read_header(AVFormatContext *s) |
| 88 | { |
| 89 | FilmDemuxContext *film = s->priv_data; |
| 90 | AVIOContext *pb = s->pb; |
| 91 | AVStream *st; |
| 92 | unsigned char scratch[256]; |
| 93 | int i, ret; |
| 94 | unsigned int data_offset; |
| 95 | unsigned int audio_frame_counter; |
| 96 | |
| 97 | film->sample_table = NULL; |
| 98 | |
| 99 | /* load the main FILM header */ |
| 100 | if (avio_read(pb, scratch, 16) != 16) |
| 101 | return AVERROR(EIO); |
| 102 | data_offset = AV_RB32(&scratch[4]); |
| 103 | film->version = AV_RB32(&scratch[8]); |
| 104 | |
| 105 | /* load the FDSC chunk */ |
| 106 | if (film->version == 0) { |
| 107 | /* special case for Lemmings .film files; 20-byte header */ |
| 108 | if (avio_read(pb, scratch, 20) != 20) |
| 109 | return AVERROR(EIO); |
| 110 | /* make some assumptions about the audio parameters */ |
| 111 | film->audio_type = AV_CODEC_ID_PCM_S8; |
| 112 | film->audio_samplerate = 22050; |
| 113 | film->audio_channels = 1; |
| 114 | film->audio_bits = 8; |
| 115 | } else { |
| 116 | /* normal Saturn .cpk files; 32-byte header */ |
| 117 | if (avio_read(pb, scratch, 32) != 32) |
| 118 | return AVERROR(EIO); |
| 119 | film->audio_samplerate = AV_RB16(&scratch[24]); |
| 120 | film->audio_channels = scratch[21]; |
| 121 | film->audio_bits = scratch[22]; |
| 122 | if (scratch[23] == 2 && film->audio_channels > 0) |
| 123 | film->audio_type = AV_CODEC_ID_ADPCM_ADX; |
| 124 | else if (film->audio_channels > 0) { |
| 125 | if (film->audio_bits == 8) |
| 126 | film->audio_type = AV_CODEC_ID_PCM_S8_PLANAR; |
| 127 | else if (film->audio_bits == 16) |
| 128 | film->audio_type = AV_CODEC_ID_PCM_S16BE_PLANAR; |
| 129 | else |
| 130 | film->audio_type = AV_CODEC_ID_NONE; |
| 131 | } else |
| 132 | film->audio_type = AV_CODEC_ID_NONE; |
| 133 | } |
| 134 | |
| 135 | if (AV_RB32(&scratch[0]) != FDSC_TAG) |
| 136 | return AVERROR_INVALIDDATA; |
| 137 | |
| 138 | if (AV_RB32(&scratch[8]) == CVID_TAG) { |
| 139 | film->video_type = AV_CODEC_ID_CINEPAK; |
| 140 | } else if (AV_RB32(&scratch[8]) == RAW_TAG) { |
| 141 | film->video_type = AV_CODEC_ID_RAWVIDEO; |
| 142 | } else { |
| 143 | film->video_type = AV_CODEC_ID_NONE; |
| 144 | } |
| 145 | |
| 146 | /* initialize the decoder streams */ |
| 147 | if (film->video_type) { |
| 148 | st = avformat_new_stream(s, NULL); |
| 149 | if (!st) |
| 150 | return AVERROR(ENOMEM); |
| 151 | film->video_stream_index = st->index; |
| 152 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 153 | st->codec->codec_id = film->video_type; |
| 154 | st->codec->codec_tag = 0; /* no fourcc */ |
| 155 | st->codec->width = AV_RB32(&scratch[16]); |
| 156 | st->codec->height = AV_RB32(&scratch[12]); |
| 157 | |
| 158 | if (film->video_type == AV_CODEC_ID_RAWVIDEO) { |
| 159 | if (scratch[20] == 24) { |
| 160 | st->codec->pix_fmt = AV_PIX_FMT_RGB24; |
| 161 | } else { |
| 162 | av_log(s, AV_LOG_ERROR, "raw video is using unhandled %dbpp\n", scratch[20]); |
| 163 | return -1; |
| 164 | } |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | if (film->audio_type) { |
| 169 | st = avformat_new_stream(s, NULL); |
| 170 | if (!st) |
| 171 | return AVERROR(ENOMEM); |
| 172 | film->audio_stream_index = st->index; |
| 173 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 174 | st->codec->codec_id = film->audio_type; |
| 175 | st->codec->codec_tag = 1; |
| 176 | st->codec->channels = film->audio_channels; |
| 177 | st->codec->sample_rate = film->audio_samplerate; |
| 178 | |
| 179 | if (film->audio_type == AV_CODEC_ID_ADPCM_ADX) { |
| 180 | st->codec->bits_per_coded_sample = 18 * 8 / 32; |
| 181 | st->codec->block_align = st->codec->channels * 18; |
| 182 | st->need_parsing = AVSTREAM_PARSE_FULL; |
| 183 | } else { |
| 184 | st->codec->bits_per_coded_sample = film->audio_bits; |
| 185 | st->codec->block_align = st->codec->channels * |
| 186 | st->codec->bits_per_coded_sample / 8; |
| 187 | } |
| 188 | |
| 189 | st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * |
| 190 | st->codec->bits_per_coded_sample; |
| 191 | } |
| 192 | |
| 193 | /* load the sample table */ |
| 194 | if (avio_read(pb, scratch, 16) != 16) |
| 195 | return AVERROR(EIO); |
| 196 | if (AV_RB32(&scratch[0]) != STAB_TAG) |
| 197 | return AVERROR_INVALIDDATA; |
| 198 | film->base_clock = AV_RB32(&scratch[8]); |
| 199 | film->sample_count = AV_RB32(&scratch[12]); |
| 200 | if(film->sample_count >= UINT_MAX / sizeof(film_sample)) |
| 201 | return -1; |
| 202 | film->sample_table = av_malloc(film->sample_count * sizeof(film_sample)); |
| 203 | if (!film->sample_table) |
| 204 | return AVERROR(ENOMEM); |
| 205 | |
| 206 | for (i = 0; i < s->nb_streams; i++) { |
| 207 | st = s->streams[i]; |
| 208 | if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) |
| 209 | avpriv_set_pts_info(st, 33, 1, film->base_clock); |
| 210 | else |
| 211 | avpriv_set_pts_info(st, 64, 1, film->audio_samplerate); |
| 212 | } |
| 213 | |
| 214 | audio_frame_counter = 0; |
| 215 | for (i = 0; i < film->sample_count; i++) { |
| 216 | /* load the next sample record and transfer it to an internal struct */ |
| 217 | if (avio_read(pb, scratch, 16) != 16) { |
| 218 | ret = AVERROR(EIO); |
| 219 | goto fail; |
| 220 | } |
| 221 | film->sample_table[i].sample_offset = |
| 222 | data_offset + AV_RB32(&scratch[0]); |
| 223 | film->sample_table[i].sample_size = AV_RB32(&scratch[4]); |
| 224 | if (film->sample_table[i].sample_size > INT_MAX / 4) { |
| 225 | ret = AVERROR_INVALIDDATA; |
| 226 | goto fail; |
| 227 | } |
| 228 | if (AV_RB32(&scratch[8]) == 0xFFFFFFFF) { |
| 229 | film->sample_table[i].stream = film->audio_stream_index; |
| 230 | film->sample_table[i].pts = audio_frame_counter; |
| 231 | |
| 232 | if (film->audio_type == AV_CODEC_ID_ADPCM_ADX) |
| 233 | audio_frame_counter += (film->sample_table[i].sample_size * 32 / |
| 234 | (18 * film->audio_channels)); |
| 235 | else if (film->audio_type != AV_CODEC_ID_NONE) |
| 236 | audio_frame_counter += (film->sample_table[i].sample_size / |
| 237 | (film->audio_channels * film->audio_bits / 8)); |
| 238 | } else { |
| 239 | film->sample_table[i].stream = film->video_stream_index; |
| 240 | film->sample_table[i].pts = AV_RB32(&scratch[8]) & 0x7FFFFFFF; |
| 241 | film->sample_table[i].keyframe = (scratch[8] & 0x80) ? 0 : 1; |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | film->current_sample = 0; |
| 246 | |
| 247 | return 0; |
| 248 | fail: |
| 249 | film_read_close(s); |
| 250 | return ret; |
| 251 | } |
| 252 | |
| 253 | static int film_read_packet(AVFormatContext *s, |
| 254 | AVPacket *pkt) |
| 255 | { |
| 256 | FilmDemuxContext *film = s->priv_data; |
| 257 | AVIOContext *pb = s->pb; |
| 258 | film_sample *sample; |
| 259 | int ret = 0; |
| 260 | |
| 261 | if (film->current_sample >= film->sample_count) |
| 262 | return AVERROR_EOF; |
| 263 | |
| 264 | sample = &film->sample_table[film->current_sample]; |
| 265 | |
| 266 | /* position the stream (will probably be there anyway) */ |
| 267 | avio_seek(pb, sample->sample_offset, SEEK_SET); |
| 268 | |
| 269 | |
| 270 | ret= av_get_packet(pb, pkt, sample->sample_size); |
| 271 | if (ret != sample->sample_size) |
| 272 | ret = AVERROR(EIO); |
| 273 | |
| 274 | pkt->stream_index = sample->stream; |
| 275 | pkt->pts = sample->pts; |
| 276 | |
| 277 | film->current_sample++; |
| 278 | |
| 279 | return ret; |
| 280 | } |
| 281 | |
| 282 | AVInputFormat ff_segafilm_demuxer = { |
| 283 | .name = "film_cpk", |
| 284 | .long_name = NULL_IF_CONFIG_SMALL("Sega FILM / CPK"), |
| 285 | .priv_data_size = sizeof(FilmDemuxContext), |
| 286 | .read_probe = film_probe, |
| 287 | .read_header = film_read_header, |
| 288 | .read_packet = film_read_packet, |
| 289 | .read_close = film_read_close, |
| 290 | }; |