1/* 2 * Wing Commander III Movie (.mve) File 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 * Wing Commander III Movie file demuxer 25 * by Mike Melanson (melanson@pcisys.net) 26 * for more information on the WC3 .mve file format, visit: 27 * http://www.pcisys.net/~melanson/codecs/ 28 */ 29 30#include "libavutil/avstring.h" 31#include "libavutil/channel_layout.h" 32#include "libavutil/intreadwrite.h" 33#include "libavutil/dict.h" 34#include "avformat.h" 35#include "internal.h" 36 37#define FORM_TAG MKTAG('F', 'O', 'R', 'M') 38#define MOVE_TAG MKTAG('M', 'O', 'V', 'E') 39#define PC__TAG MKTAG('_', 'P', 'C', '_') 40#define SOND_TAG MKTAG('S', 'O', 'N', 'D') 41#define BNAM_TAG MKTAG('B', 'N', 'A', 'M') 42#define SIZE_TAG MKTAG('S', 'I', 'Z', 'E') 43#define PALT_TAG MKTAG('P', 'A', 'L', 'T') 44#define INDX_TAG MKTAG('I', 'N', 'D', 'X') 45#define BRCH_TAG MKTAG('B', 'R', 'C', 'H') 46#define SHOT_TAG MKTAG('S', 'H', 'O', 'T') 47#define VGA__TAG MKTAG('V', 'G', 'A', ' ') 48#define TEXT_TAG MKTAG('T', 'E', 'X', 'T') 49#define AUDI_TAG MKTAG('A', 'U', 'D', 'I') 50 51/* video resolution unless otherwise specified */ 52#define WC3_DEFAULT_WIDTH 320 53#define WC3_DEFAULT_HEIGHT 165 54 55/* always use the same PCM audio parameters */ 56#define WC3_SAMPLE_RATE 22050 57#define WC3_AUDIO_CHANNELS 1 58#define WC3_AUDIO_BITS 16 59 60/* nice, constant framerate */ 61#define WC3_FRAME_FPS 15 62 63#define PALETTE_SIZE (256 * 3) 64 65typedef struct Wc3DemuxContext { 66 int width; 67 int height; 68 int64_t pts; 69 int video_stream_index; 70 int audio_stream_index; 71 72 AVPacket vpkt; 73 74} Wc3DemuxContext; 75 76static int wc3_probe(AVProbeData *p) 77{ 78 if (p->buf_size < 12) 79 return 0; 80 81 if ((AV_RL32(&p->buf[0]) != FORM_TAG) || 82 (AV_RL32(&p->buf[8]) != MOVE_TAG)) 83 return 0; 84 85 return AVPROBE_SCORE_MAX; 86} 87 88static int wc3_read_header(AVFormatContext *s) 89{ 90 Wc3DemuxContext *wc3 = s->priv_data; 91 AVIOContext *pb = s->pb; 92 unsigned int fourcc_tag; 93 unsigned int size; 94 AVStream *st; 95 int ret = 0; 96 char *buffer; 97 98 /* default context members */ 99 wc3->width = WC3_DEFAULT_WIDTH; 100 wc3->height = WC3_DEFAULT_HEIGHT; 101 wc3->pts = 0; 102 wc3->video_stream_index = wc3->audio_stream_index = 0; 103 av_init_packet(&wc3->vpkt); 104 wc3->vpkt.data = NULL; wc3->vpkt.size = 0; 105 106 /* skip the first 3 32-bit numbers */ 107 avio_skip(pb, 12); 108 109 /* traverse through the chunks and load the header information before 110 * the first BRCH tag */ 111 fourcc_tag = avio_rl32(pb); 112 size = (avio_rb32(pb) + 1) & (~1); 113 114 do { 115 switch (fourcc_tag) { 116 117 case SOND_TAG: 118 case INDX_TAG: 119 /* SOND unknown, INDX unnecessary; ignore both */ 120 avio_skip(pb, size); 121 break; 122 123 case PC__TAG: 124 /* number of palettes, unneeded */ 125 avio_skip(pb, 12); 126 break; 127 128 case BNAM_TAG: 129 /* load up the name */ 130 buffer = av_malloc(size+1); 131 if (!buffer) 132 return AVERROR(ENOMEM); 133 if ((ret = avio_read(pb, buffer, size)) != size) 134 return AVERROR(EIO); 135 buffer[size] = 0; 136 av_dict_set(&s->metadata, "title", buffer, 137 AV_DICT_DONT_STRDUP_VAL); 138 break; 139 140 case SIZE_TAG: 141 /* video resolution override */ 142 wc3->width = avio_rl32(pb); 143 wc3->height = avio_rl32(pb); 144 break; 145 146 case PALT_TAG: 147 /* one of several palettes */ 148 avio_seek(pb, -8, SEEK_CUR); 149 av_append_packet(pb, &wc3->vpkt, 8 + PALETTE_SIZE); 150 break; 151 152 default: 153 av_log(s, AV_LOG_ERROR, " unrecognized WC3 chunk: %c%c%c%c (0x%02X%02X%02X%02X)\n", 154 (uint8_t)fourcc_tag, (uint8_t)(fourcc_tag >> 8), (uint8_t)(fourcc_tag >> 16), (uint8_t)(fourcc_tag >> 24), 155 (uint8_t)fourcc_tag, (uint8_t)(fourcc_tag >> 8), (uint8_t)(fourcc_tag >> 16), (uint8_t)(fourcc_tag >> 24)); 156 return AVERROR_INVALIDDATA; 157 } 158 159 fourcc_tag = avio_rl32(pb); 160 /* chunk sizes are 16-bit aligned */ 161 size = (avio_rb32(pb) + 1) & (~1); 162 if (url_feof(pb)) 163 return AVERROR(EIO); 164 165 } while (fourcc_tag != BRCH_TAG); 166 167 /* initialize the decoder streams */ 168 st = avformat_new_stream(s, NULL); 169 if (!st) 170 return AVERROR(ENOMEM); 171 avpriv_set_pts_info(st, 33, 1, WC3_FRAME_FPS); 172 wc3->video_stream_index = st->index; 173 st->codec->codec_type = AVMEDIA_TYPE_VIDEO; 174 st->codec->codec_id = AV_CODEC_ID_XAN_WC3; 175 st->codec->codec_tag = 0; /* no fourcc */ 176 st->codec->width = wc3->width; 177 st->codec->height = wc3->height; 178 179 st = avformat_new_stream(s, NULL); 180 if (!st) 181 return AVERROR(ENOMEM); 182 avpriv_set_pts_info(st, 33, 1, WC3_FRAME_FPS); 183 wc3->audio_stream_index = st->index; 184 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 185 st->codec->codec_id = AV_CODEC_ID_PCM_S16LE; 186 st->codec->codec_tag = 1; 187 st->codec->channels = WC3_AUDIO_CHANNELS; 188 st->codec->channel_layout = AV_CH_LAYOUT_MONO; 189 st->codec->bits_per_coded_sample = WC3_AUDIO_BITS; 190 st->codec->sample_rate = WC3_SAMPLE_RATE; 191 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * 192 st->codec->bits_per_coded_sample; 193 st->codec->block_align = WC3_AUDIO_BITS * WC3_AUDIO_CHANNELS; 194 195 return 0; 196} 197 198static int wc3_read_packet(AVFormatContext *s, 199 AVPacket *pkt) 200{ 201 Wc3DemuxContext *wc3 = s->priv_data; 202 AVIOContext *pb = s->pb; 203 unsigned int fourcc_tag; 204 unsigned int size; 205 int packet_read = 0; 206 int ret = 0; 207 unsigned char text[1024]; 208 209 while (!packet_read) { 210 211 fourcc_tag = avio_rl32(pb); 212 /* chunk sizes are 16-bit aligned */ 213 size = (avio_rb32(pb) + 1) & (~1); 214 if (url_feof(pb)) 215 return AVERROR(EIO); 216 217 switch (fourcc_tag) { 218 219 case BRCH_TAG: 220 /* no-op */ 221 break; 222 223 case SHOT_TAG: 224 /* load up new palette */ 225 avio_seek(pb, -8, SEEK_CUR); 226 av_append_packet(pb, &wc3->vpkt, 8 + 4); 227 break; 228 229 case VGA__TAG: 230 /* send out video chunk */ 231 avio_seek(pb, -8, SEEK_CUR); 232 ret= av_append_packet(pb, &wc3->vpkt, 8 + size); 233 // ignore error if we have some data 234 if (wc3->vpkt.size > 0) 235 ret = 0; 236 *pkt = wc3->vpkt; 237 wc3->vpkt.data = NULL; wc3->vpkt.size = 0; 238 pkt->stream_index = wc3->video_stream_index; 239 pkt->pts = wc3->pts; 240 packet_read = 1; 241 break; 242 243 case TEXT_TAG: 244 /* subtitle chunk */ 245#if 0 246 avio_skip(pb, size); 247#else 248 if ((unsigned)size > sizeof(text) || (ret = avio_read(pb, text, size)) != size) 249 ret = AVERROR(EIO); 250 else { 251 int i = 0; 252 av_log (s, AV_LOG_DEBUG, "Subtitle time!\n"); 253 if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1) 254 return AVERROR_INVALIDDATA; 255 av_log (s, AV_LOG_DEBUG, " inglish: %s\n", &text[i + 1]); 256 i += text[i] + 1; 257 if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1) 258 return AVERROR_INVALIDDATA; 259 av_log (s, AV_LOG_DEBUG, " doytsch: %s\n", &text[i + 1]); 260 i += text[i] + 1; 261 if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1) 262 return AVERROR_INVALIDDATA; 263 av_log (s, AV_LOG_DEBUG, " fronsay: %s\n", &text[i + 1]); 264 } 265#endif 266 break; 267 268 case AUDI_TAG: 269 /* send out audio chunk */ 270 ret= av_get_packet(pb, pkt, size); 271 pkt->stream_index = wc3->audio_stream_index; 272 pkt->pts = wc3->pts; 273 274 /* time to advance pts */ 275 wc3->pts++; 276 277 packet_read = 1; 278 break; 279 280 default: 281 av_log (s, AV_LOG_ERROR, " unrecognized WC3 chunk: %c%c%c%c (0x%02X%02X%02X%02X)\n", 282 (uint8_t)fourcc_tag, (uint8_t)(fourcc_tag >> 8), (uint8_t)(fourcc_tag >> 16), (uint8_t)(fourcc_tag >> 24), 283 (uint8_t)fourcc_tag, (uint8_t)(fourcc_tag >> 8), (uint8_t)(fourcc_tag >> 16), (uint8_t)(fourcc_tag >> 24)); 284 ret = AVERROR_INVALIDDATA; 285 packet_read = 1; 286 break; 287 } 288 } 289 290 return ret; 291} 292 293static int wc3_read_close(AVFormatContext *s) 294{ 295 Wc3DemuxContext *wc3 = s->priv_data; 296 297 if (wc3->vpkt.size > 0) 298 av_free_packet(&wc3->vpkt); 299 300 return 0; 301} 302 303AVInputFormat ff_wc3_demuxer = { 304 .name = "wc3movie", 305 .long_name = NULL_IF_CONFIG_SMALL("Wing Commander III movie"), 306 .priv_data_size = sizeof(Wc3DemuxContext), 307 .read_probe = wc3_probe, 308 .read_header = wc3_read_header, 309 .read_packet = wc3_read_packet, 310 .read_close = wc3_read_close, 311}; 312