1/* 2 * Sega FILM Format (CPK) Demuxer 3 * Copyright (c) 2003 The ffmpeg Project 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; 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 34#define FILM_TAG MKBETAG('F', 'I', 'L', 'M') 35#define FDSC_TAG MKBETAG('F', 'D', 'S', 'C') 36#define STAB_TAG MKBETAG('S', 'T', 'A', 'B') 37#define CVID_TAG MKBETAG('c', 'v', 'i', 'd') 38#define RAW_TAG MKBETAG('r', 'a', 'w', ' ') 39 40typedef struct { 41 int stream; 42 int64_t sample_offset; 43 unsigned int sample_size; 44 int64_t pts; 45 int keyframe; 46} film_sample; 47 48typedef struct FilmDemuxContext { 49 int video_stream_index; 50 int audio_stream_index; 51 52 enum CodecID audio_type; 53 unsigned int audio_samplerate; 54 unsigned int audio_bits; 55 unsigned int audio_channels; 56 57 enum CodecID video_type; 58 unsigned int sample_count; 59 film_sample *sample_table; 60 unsigned int current_sample; 61 62 unsigned int base_clock; 63 unsigned int version; 64 65 /* buffer used for interleaving stereo PCM data */ 66 unsigned char *stereo_buffer; 67 int stereo_buffer_size; 68} FilmDemuxContext; 69 70static int film_probe(AVProbeData *p) 71{ 72 if (AV_RB32(&p->buf[0]) != FILM_TAG) 73 return 0; 74 75 return AVPROBE_SCORE_MAX; 76} 77 78static int film_read_header(AVFormatContext *s, 79 AVFormatParameters *ap) 80{ 81 FilmDemuxContext *film = s->priv_data; 82 AVIOContext *pb = s->pb; 83 AVStream *st; 84 unsigned char scratch[256]; 85 int i; 86 unsigned int data_offset; 87 unsigned int audio_frame_counter; 88 89 film->sample_table = NULL; 90 film->stereo_buffer = NULL; 91 film->stereo_buffer_size = 0; 92 93 /* load the main FILM header */ 94 if (avio_read(pb, scratch, 16) != 16) 95 return AVERROR(EIO); 96 data_offset = AV_RB32(&scratch[4]); 97 film->version = AV_RB32(&scratch[8]); 98 99 /* load the FDSC chunk */ 100 if (film->version == 0) { 101 /* special case for Lemmings .film files; 20-byte header */ 102 if (avio_read(pb, scratch, 20) != 20) 103 return AVERROR(EIO); 104 /* make some assumptions about the audio parameters */ 105 film->audio_type = CODEC_ID_PCM_S8; 106 film->audio_samplerate = 22050; 107 film->audio_channels = 1; 108 film->audio_bits = 8; 109 } else { 110 /* normal Saturn .cpk files; 32-byte header */ 111 if (avio_read(pb, scratch, 32) != 32) 112 return AVERROR(EIO); 113 film->audio_samplerate = AV_RB16(&scratch[24]); 114 film->audio_channels = scratch[21]; 115 film->audio_bits = scratch[22]; 116 if (scratch[23] == 2) 117 film->audio_type = CODEC_ID_ADPCM_ADX; 118 else if (film->audio_channels > 0) { 119 if (film->audio_bits == 8) 120 film->audio_type = CODEC_ID_PCM_S8; 121 else if (film->audio_bits == 16) 122 film->audio_type = CODEC_ID_PCM_S16BE; 123 else 124 film->audio_type = CODEC_ID_NONE; 125 } else 126 film->audio_type = CODEC_ID_NONE; 127 } 128 129 if (AV_RB32(&scratch[0]) != FDSC_TAG) 130 return AVERROR_INVALIDDATA; 131 132 if (AV_RB32(&scratch[8]) == CVID_TAG) { 133 film->video_type = CODEC_ID_CINEPAK; 134 } else if (AV_RB32(&scratch[8]) == RAW_TAG) { 135 film->video_type = CODEC_ID_RAWVIDEO; 136 } else { 137 film->video_type = CODEC_ID_NONE; 138 } 139 140 /* initialize the decoder streams */ 141 if (film->video_type) { 142 st = avformat_new_stream(s, NULL); 143 if (!st) 144 return AVERROR(ENOMEM); 145 film->video_stream_index = st->index; 146 st->codec->codec_type = AVMEDIA_TYPE_VIDEO; 147 st->codec->codec_id = film->video_type; 148 st->codec->codec_tag = 0; /* no fourcc */ 149 st->codec->width = AV_RB32(&scratch[16]); 150 st->codec->height = AV_RB32(&scratch[12]); 151 152 if (film->video_type == CODEC_ID_RAWVIDEO) { 153 if (scratch[20] == 24) { 154 st->codec->pix_fmt = PIX_FMT_RGB24; 155 } else { 156 av_log(s, AV_LOG_ERROR, "raw video is using unhandled %dbpp\n", scratch[20]); 157 return -1; 158 } 159 } 160 } 161 162 if (film->audio_type) { 163 st = avformat_new_stream(s, NULL); 164 if (!st) 165 return AVERROR(ENOMEM); 166 film->audio_stream_index = st->index; 167 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 168 st->codec->codec_id = film->audio_type; 169 st->codec->codec_tag = 1; 170 st->codec->channels = film->audio_channels; 171 st->codec->sample_rate = film->audio_samplerate; 172 173 if (film->audio_type == CODEC_ID_ADPCM_ADX) { 174 st->codec->bits_per_coded_sample = 18 * 8 / 32; 175 st->codec->block_align = st->codec->channels * 18; 176 st->need_parsing = AVSTREAM_PARSE_FULL; 177 } else { 178 st->codec->bits_per_coded_sample = film->audio_bits; 179 st->codec->block_align = st->codec->channels * 180 st->codec->bits_per_coded_sample / 8; 181 } 182 183 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * 184 st->codec->bits_per_coded_sample; 185 } 186 187 /* load the sample table */ 188 if (avio_read(pb, scratch, 16) != 16) 189 return AVERROR(EIO); 190 if (AV_RB32(&scratch[0]) != STAB_TAG) 191 return AVERROR_INVALIDDATA; 192 film->base_clock = AV_RB32(&scratch[8]); 193 film->sample_count = AV_RB32(&scratch[12]); 194 if(film->sample_count >= UINT_MAX / sizeof(film_sample)) 195 return -1; 196 film->sample_table = av_malloc(film->sample_count * sizeof(film_sample)); 197 if (!film->sample_table) 198 return AVERROR(ENOMEM); 199 200 for(i=0; i<s->nb_streams; i++) 201 avpriv_set_pts_info(s->streams[i], 33, 1, film->base_clock); 202 203 audio_frame_counter = 0; 204 for (i = 0; i < film->sample_count; i++) { 205 /* load the next sample record and transfer it to an internal struct */ 206 if (avio_read(pb, scratch, 16) != 16) { 207 av_free(film->sample_table); 208 return AVERROR(EIO); 209 } 210 film->sample_table[i].sample_offset = 211 data_offset + AV_RB32(&scratch[0]); 212 film->sample_table[i].sample_size = AV_RB32(&scratch[4]); 213 if (AV_RB32(&scratch[8]) == 0xFFFFFFFF) { 214 film->sample_table[i].stream = film->audio_stream_index; 215 film->sample_table[i].pts = audio_frame_counter; 216 film->sample_table[i].pts *= film->base_clock; 217 film->sample_table[i].pts /= film->audio_samplerate; 218 219 if (film->audio_type == CODEC_ID_ADPCM_ADX) 220 audio_frame_counter += (film->sample_table[i].sample_size * 32 / 221 (18 * film->audio_channels)); 222 else if (film->audio_type != CODEC_ID_NONE) 223 audio_frame_counter += (film->sample_table[i].sample_size / 224 (film->audio_channels * film->audio_bits / 8)); 225 } else { 226 film->sample_table[i].stream = film->video_stream_index; 227 film->sample_table[i].pts = AV_RB32(&scratch[8]) & 0x7FFFFFFF; 228 film->sample_table[i].keyframe = (scratch[8] & 0x80) ? 0 : 1; 229 } 230 } 231 232 film->current_sample = 0; 233 234 return 0; 235} 236 237static int film_read_packet(AVFormatContext *s, 238 AVPacket *pkt) 239{ 240 FilmDemuxContext *film = s->priv_data; 241 AVIOContext *pb = s->pb; 242 film_sample *sample; 243 int ret = 0; 244 int i; 245 int left, right; 246 247 if (film->current_sample >= film->sample_count) 248 return AVERROR(EIO); 249 250 sample = &film->sample_table[film->current_sample]; 251 252 /* position the stream (will probably be there anyway) */ 253 avio_seek(pb, sample->sample_offset, SEEK_SET); 254 255 /* do a special song and dance when loading FILM Cinepak chunks */ 256 if ((sample->stream == film->video_stream_index) && 257 (film->video_type == CODEC_ID_CINEPAK)) { 258 pkt->pos= avio_tell(pb); 259 if (av_new_packet(pkt, sample->sample_size)) 260 return AVERROR(ENOMEM); 261 avio_read(pb, pkt->data, sample->sample_size); 262 } else if ((sample->stream == film->audio_stream_index) && 263 (film->audio_channels == 2) && 264 (film->audio_type != CODEC_ID_ADPCM_ADX)) { 265 /* stereo PCM needs to be interleaved */ 266 267 if (av_new_packet(pkt, sample->sample_size)) 268 return AVERROR(ENOMEM); 269 270 /* make sure the interleave buffer is large enough */ 271 if (sample->sample_size > film->stereo_buffer_size) { 272 av_free(film->stereo_buffer); 273 film->stereo_buffer_size = sample->sample_size; 274 film->stereo_buffer = av_malloc(film->stereo_buffer_size); 275 if (!film->stereo_buffer) { 276 film->stereo_buffer_size = 0; 277 return AVERROR(ENOMEM); 278 } 279 } 280 281 pkt->pos= avio_tell(pb); 282 ret = avio_read(pb, film->stereo_buffer, sample->sample_size); 283 if (ret != sample->sample_size) 284 ret = AVERROR(EIO); 285 286 left = 0; 287 right = sample->sample_size / 2; 288 for (i = 0; i < sample->sample_size; ) { 289 if (film->audio_bits == 8) { 290 pkt->data[i++] = film->stereo_buffer[left++]; 291 pkt->data[i++] = film->stereo_buffer[right++]; 292 } else { 293 pkt->data[i++] = film->stereo_buffer[left++]; 294 pkt->data[i++] = film->stereo_buffer[left++]; 295 pkt->data[i++] = film->stereo_buffer[right++]; 296 pkt->data[i++] = film->stereo_buffer[right++]; 297 } 298 } 299 } else { 300 ret= av_get_packet(pb, pkt, sample->sample_size); 301 if (ret != sample->sample_size) 302 ret = AVERROR(EIO); 303 } 304 305 pkt->stream_index = sample->stream; 306 pkt->pts = sample->pts; 307 308 film->current_sample++; 309 310 return ret; 311} 312 313static int film_read_close(AVFormatContext *s) 314{ 315 FilmDemuxContext *film = s->priv_data; 316 317 av_free(film->sample_table); 318 av_free(film->stereo_buffer); 319 320 return 0; 321} 322 323AVInputFormat ff_segafilm_demuxer = { 324 .name = "film_cpk", 325 .long_name = NULL_IF_CONFIG_SMALL("Sega FILM/CPK format"), 326 .priv_data_size = sizeof(FilmDemuxContext), 327 .read_probe = film_probe, 328 .read_header = film_read_header, 329 .read_packet = film_read_packet, 330 .read_close = film_read_close, 331}; 332