| 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 | |
| 65 | typedef 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 | |
| 76 | static 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 | |
| 88 | static 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 (avio_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 | |
| 198 | static 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 (avio_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 | |
| 293 | static 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 | |
| 303 | AVInputFormat 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 | }; |