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_BITS 16 58 59/* nice, constant framerate */ 60#define WC3_FRAME_FPS 15 61 62#define PALETTE_SIZE (256 * 3) 63 64typedef struct Wc3DemuxContext { 65 int width; 66 int height; 67 int64_t pts; 68 int video_stream_index; 69 int audio_stream_index; 70 71 AVPacket *vpkt; 72 73} Wc3DemuxContext; 74 75static int wc3_read_close(AVFormatContext *s) 76{ 77 Wc3DemuxContext *wc3 = s->priv_data; 78 79 av_packet_free(&wc3->vpkt); 80 81 return 0; 82} 83 84static int wc3_probe(const AVProbeData *p) 85{ 86 if (p->buf_size < 12) 87 return 0; 88 89 if ((AV_RL32(&p->buf[0]) != FORM_TAG) || 90 (AV_RL32(&p->buf[8]) != MOVE_TAG)) 91 return 0; 92 93 return AVPROBE_SCORE_MAX; 94} 95 96static int wc3_read_header(AVFormatContext *s) 97{ 98 Wc3DemuxContext *wc3 = s->priv_data; 99 AVIOContext *pb = s->pb; 100 unsigned int fourcc_tag; 101 unsigned int size; 102 AVStream *st; 103 int ret = 0; 104 char *buffer; 105 106 /* default context members */ 107 wc3->width = WC3_DEFAULT_WIDTH; 108 wc3->height = WC3_DEFAULT_HEIGHT; 109 wc3->pts = 0; 110 wc3->video_stream_index = wc3->audio_stream_index = 0; 111 wc3->vpkt = av_packet_alloc(); 112 if (!wc3->vpkt) 113 return AVERROR(ENOMEM); 114 115 /* skip the first 3 32-bit numbers */ 116 avio_skip(pb, 12); 117 118 /* traverse through the chunks and load the header information before 119 * the first BRCH tag */ 120 fourcc_tag = avio_rl32(pb); 121 size = (avio_rb32(pb) + 1) & (~1); 122 123 do { 124 switch (fourcc_tag) { 125 126 case SOND_TAG: 127 case INDX_TAG: 128 /* SOND unknown, INDX unnecessary; ignore both */ 129 avio_skip(pb, size); 130 break; 131 132 case PC__TAG: 133 /* number of palettes, unneeded */ 134 avio_skip(pb, 12); 135 break; 136 137 case BNAM_TAG: 138 /* load up the name */ 139 buffer = av_malloc(size+1); 140 if (!buffer) 141 return AVERROR(ENOMEM); 142 if ((ret = avio_read(pb, buffer, size)) != size) { 143 av_freep(&buffer); 144 return AVERROR(EIO); 145 } 146 buffer[size] = 0; 147 av_dict_set(&s->metadata, "title", buffer, 148 AV_DICT_DONT_STRDUP_VAL); 149 break; 150 151 case SIZE_TAG: 152 /* video resolution override */ 153 wc3->width = avio_rl32(pb); 154 wc3->height = avio_rl32(pb); 155 break; 156 157 case PALT_TAG: 158 /* one of several palettes */ 159 avio_seek(pb, -8, SEEK_CUR); 160 av_append_packet(pb, wc3->vpkt, 8 + PALETTE_SIZE); 161 break; 162 163 default: 164 av_log(s, AV_LOG_ERROR, "unrecognized WC3 chunk: %s\n", 165 av_fourcc2str(fourcc_tag)); 166 return AVERROR_INVALIDDATA; 167 } 168 169 fourcc_tag = avio_rl32(pb); 170 /* chunk sizes are 16-bit aligned */ 171 size = (avio_rb32(pb) + 1) & (~1); 172 if (avio_feof(pb)) 173 return AVERROR(EIO); 174 175 } while (fourcc_tag != BRCH_TAG); 176 177 /* initialize the decoder streams */ 178 st = avformat_new_stream(s, NULL); 179 if (!st) 180 return AVERROR(ENOMEM); 181 avpriv_set_pts_info(st, 33, 1, WC3_FRAME_FPS); 182 wc3->video_stream_index = st->index; 183 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; 184 st->codecpar->codec_id = AV_CODEC_ID_XAN_WC3; 185 st->codecpar->codec_tag = 0; /* no fourcc */ 186 st->codecpar->width = wc3->width; 187 st->codecpar->height = wc3->height; 188 189 st = avformat_new_stream(s, NULL); 190 if (!st) 191 return AVERROR(ENOMEM); 192 avpriv_set_pts_info(st, 33, 1, WC3_FRAME_FPS); 193 wc3->audio_stream_index = st->index; 194 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; 195 st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE; 196 st->codecpar->codec_tag = 1; 197 st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO; 198 st->codecpar->bits_per_coded_sample = WC3_AUDIO_BITS; 199 st->codecpar->sample_rate = WC3_SAMPLE_RATE; 200 st->codecpar->bit_rate = st->codecpar->ch_layout.nb_channels * st->codecpar->sample_rate * 201 st->codecpar->bits_per_coded_sample; 202 st->codecpar->block_align = WC3_AUDIO_BITS * st->codecpar->ch_layout.nb_channels; 203 204 return 0; 205} 206 207static int wc3_read_packet(AVFormatContext *s, 208 AVPacket *pkt) 209{ 210 Wc3DemuxContext *wc3 = s->priv_data; 211 AVIOContext *pb = s->pb; 212 unsigned int fourcc_tag; 213 unsigned int size; 214 int packet_read = 0; 215 int ret = 0; 216 unsigned char text[1024]; 217 218 while (!packet_read) { 219 220 fourcc_tag = avio_rl32(pb); 221 /* chunk sizes are 16-bit aligned */ 222 size = (avio_rb32(pb) + 1) & (~1); 223 if (avio_feof(pb)) 224 return AVERROR(EIO); 225 226 switch (fourcc_tag) { 227 228 case BRCH_TAG: 229 /* no-op */ 230 break; 231 232 case SHOT_TAG: 233 /* load up new palette */ 234 avio_seek(pb, -8, SEEK_CUR); 235 av_append_packet(pb, wc3->vpkt, 8 + 4); 236 break; 237 238 case VGA__TAG: 239 /* send out video chunk */ 240 avio_seek(pb, -8, SEEK_CUR); 241 ret= av_append_packet(pb, wc3->vpkt, 8 + size); 242 // ignore error if we have some data 243 if (wc3->vpkt->size > 0) 244 ret = 0; 245 av_packet_move_ref(pkt, wc3->vpkt); 246 pkt->stream_index = wc3->video_stream_index; 247 pkt->pts = wc3->pts; 248 packet_read = 1; 249 break; 250 251 case TEXT_TAG: 252 /* subtitle chunk */ 253 if ((unsigned)size > sizeof(text) || (ret = avio_read(pb, text, size)) != size) 254 ret = AVERROR(EIO); 255 else { 256 int i = 0; 257 av_log (s, AV_LOG_DEBUG, "Subtitle time!\n"); 258 if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1) 259 return AVERROR_INVALIDDATA; 260 av_log (s, AV_LOG_DEBUG, " inglish: %s\n", &text[i + 1]); 261 i += text[i] + 1; 262 if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1) 263 return AVERROR_INVALIDDATA; 264 av_log (s, AV_LOG_DEBUG, " doytsch: %s\n", &text[i + 1]); 265 i += text[i] + 1; 266 if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1) 267 return AVERROR_INVALIDDATA; 268 av_log (s, AV_LOG_DEBUG, " fronsay: %s\n", &text[i + 1]); 269 } 270 break; 271 272 case AUDI_TAG: 273 /* send out audio chunk */ 274 ret= av_get_packet(pb, pkt, size); 275 pkt->stream_index = wc3->audio_stream_index; 276 pkt->pts = wc3->pts; 277 278 /* time to advance pts */ 279 wc3->pts++; 280 281 packet_read = 1; 282 break; 283 284 default: 285 av_log(s, AV_LOG_ERROR, "unrecognized WC3 chunk: %s\n", 286 av_fourcc2str(fourcc_tag)); 287 ret = AVERROR_INVALIDDATA; 288 packet_read = 1; 289 break; 290 } 291 } 292 293 return ret; 294} 295 296const AVInputFormat ff_wc3_demuxer = { 297 .name = "wc3movie", 298 .long_name = NULL_IF_CONFIG_SMALL("Wing Commander III movie"), 299 .priv_data_size = sizeof(Wc3DemuxContext), 300 .flags_internal = FF_FMT_INIT_CLEANUP, 301 .read_probe = wc3_probe, 302 .read_header = wc3_read_header, 303 .read_packet = wc3_read_packet, 304 .read_close = wc3_read_close, 305}; 306