2 * Wing Commander III Movie (.mve) File Demuxer
3 * Copyright (c) 2003 The FFmpeg project
5 * This file is part of FFmpeg.
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.
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.
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
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/
30 #include "libavutil/avstring.h"
31 #include "libavutil/channel_layout.h"
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/dict.h"
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')
51 /* video resolution unless otherwise specified */
52 #define WC3_DEFAULT_WIDTH 320
53 #define WC3_DEFAULT_HEIGHT 165
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
60 /* nice, constant framerate */
61 #define WC3_FRAME_FPS 15
63 #define PALETTE_SIZE (256 * 3)
65 typedef struct Wc3DemuxContext {
69 int video_stream_index;
70 int audio_stream_index;
76 static int wc3_read_close(AVFormatContext *s)
78 Wc3DemuxContext *wc3 = s->priv_data;
80 if (wc3->vpkt.size > 0)
81 av_packet_unref(&wc3->vpkt);
86 static int wc3_probe(const AVProbeData *p)
91 if ((AV_RL32(&p->buf[0]) != FORM_TAG) ||
92 (AV_RL32(&p->buf[8]) != MOVE_TAG))
95 return AVPROBE_SCORE_MAX;
98 static int wc3_read_header(AVFormatContext *s)
100 Wc3DemuxContext *wc3 = s->priv_data;
101 AVIOContext *pb = s->pb;
102 unsigned int fourcc_tag;
108 /* default context members */
109 wc3->width = WC3_DEFAULT_WIDTH;
110 wc3->height = WC3_DEFAULT_HEIGHT;
112 wc3->video_stream_index = wc3->audio_stream_index = 0;
113 av_init_packet(&wc3->vpkt);
114 wc3->vpkt.data = NULL; wc3->vpkt.size = 0;
116 /* skip the first 3 32-bit numbers */
119 /* traverse through the chunks and load the header information before
120 * the first BRCH tag */
121 fourcc_tag = avio_rl32(pb);
122 size = (avio_rb32(pb) + 1) & (~1);
125 switch (fourcc_tag) {
129 /* SOND unknown, INDX unnecessary; ignore both */
134 /* number of palettes, unneeded */
139 /* load up the name */
140 buffer = av_malloc(size+1);
142 return AVERROR(ENOMEM);
143 if ((ret = avio_read(pb, buffer, size)) != size) {
148 av_dict_set(&s->metadata, "title", buffer,
149 AV_DICT_DONT_STRDUP_VAL);
153 /* video resolution override */
154 wc3->width = avio_rl32(pb);
155 wc3->height = avio_rl32(pb);
159 /* one of several palettes */
160 avio_seek(pb, -8, SEEK_CUR);
161 av_append_packet(pb, &wc3->vpkt, 8 + PALETTE_SIZE);
165 av_log(s, AV_LOG_ERROR, "unrecognized WC3 chunk: %s\n",
166 av_fourcc2str(fourcc_tag));
167 return AVERROR_INVALIDDATA;
170 fourcc_tag = avio_rl32(pb);
171 /* chunk sizes are 16-bit aligned */
172 size = (avio_rb32(pb) + 1) & (~1);
176 } while (fourcc_tag != BRCH_TAG);
178 /* initialize the decoder streams */
179 st = avformat_new_stream(s, NULL);
181 return AVERROR(ENOMEM);
182 avpriv_set_pts_info(st, 33, 1, WC3_FRAME_FPS);
183 wc3->video_stream_index = st->index;
184 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
185 st->codecpar->codec_id = AV_CODEC_ID_XAN_WC3;
186 st->codecpar->codec_tag = 0; /* no fourcc */
187 st->codecpar->width = wc3->width;
188 st->codecpar->height = wc3->height;
190 st = avformat_new_stream(s, NULL);
192 return AVERROR(ENOMEM);
193 avpriv_set_pts_info(st, 33, 1, WC3_FRAME_FPS);
194 wc3->audio_stream_index = st->index;
195 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
196 st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
197 st->codecpar->codec_tag = 1;
198 st->codecpar->channels = WC3_AUDIO_CHANNELS;
199 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
200 st->codecpar->bits_per_coded_sample = WC3_AUDIO_BITS;
201 st->codecpar->sample_rate = WC3_SAMPLE_RATE;
202 st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate *
203 st->codecpar->bits_per_coded_sample;
204 st->codecpar->block_align = WC3_AUDIO_BITS * WC3_AUDIO_CHANNELS;
209 static int wc3_read_packet(AVFormatContext *s,
212 Wc3DemuxContext *wc3 = s->priv_data;
213 AVIOContext *pb = s->pb;
214 unsigned int fourcc_tag;
218 unsigned char text[1024];
220 while (!packet_read) {
222 fourcc_tag = avio_rl32(pb);
223 /* chunk sizes are 16-bit aligned */
224 size = (avio_rb32(pb) + 1) & (~1);
228 switch (fourcc_tag) {
235 /* load up new palette */
236 avio_seek(pb, -8, SEEK_CUR);
237 av_append_packet(pb, &wc3->vpkt, 8 + 4);
241 /* send out video chunk */
242 avio_seek(pb, -8, SEEK_CUR);
243 ret= av_append_packet(pb, &wc3->vpkt, 8 + size);
244 // ignore error if we have some data
245 if (wc3->vpkt.size > 0)
248 wc3->vpkt.data = NULL; wc3->vpkt.size = 0;
249 pkt->stream_index = wc3->video_stream_index;
256 if ((unsigned)size > sizeof(text) || (ret = avio_read(pb, text, size)) != size)
260 av_log (s, AV_LOG_DEBUG, "Subtitle time!\n");
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, " inglish: %s\n", &text[i + 1]);
265 if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)
266 return AVERROR_INVALIDDATA;
267 av_log (s, AV_LOG_DEBUG, " doytsch: %s\n", &text[i + 1]);
269 if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)
270 return AVERROR_INVALIDDATA;
271 av_log (s, AV_LOG_DEBUG, " fronsay: %s\n", &text[i + 1]);
276 /* send out audio chunk */
277 ret= av_get_packet(pb, pkt, size);
278 pkt->stream_index = wc3->audio_stream_index;
281 /* time to advance pts */
288 av_log(s, AV_LOG_ERROR, "unrecognized WC3 chunk: %s\n",
289 av_fourcc2str(fourcc_tag));
290 ret = AVERROR_INVALIDDATA;
299 AVInputFormat ff_wc3_demuxer = {
301 .long_name = NULL_IF_CONFIG_SMALL("Wing Commander III movie"),
302 .priv_data_size = sizeof(Wc3DemuxContext),
303 .read_probe = wc3_probe,
304 .read_header = wc3_read_header,
305 .read_packet = wc3_read_packet,
306 .read_close = wc3_read_close,