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path: root/libavformat/wc3movie.c (plain)
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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: %s\n",
154 av_fourcc2str(fourcc_tag));
155 return AVERROR_INVALIDDATA;
156 }
157
158 fourcc_tag = avio_rl32(pb);
159 /* chunk sizes are 16-bit aligned */
160 size = (avio_rb32(pb) + 1) & (~1);
161 if (avio_feof(pb))
162 return AVERROR(EIO);
163
164 } while (fourcc_tag != BRCH_TAG);
165
166 /* initialize the decoder streams */
167 st = avformat_new_stream(s, NULL);
168 if (!st)
169 return AVERROR(ENOMEM);
170 avpriv_set_pts_info(st, 33, 1, WC3_FRAME_FPS);
171 wc3->video_stream_index = st->index;
172 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
173 st->codecpar->codec_id = AV_CODEC_ID_XAN_WC3;
174 st->codecpar->codec_tag = 0; /* no fourcc */
175 st->codecpar->width = wc3->width;
176 st->codecpar->height = wc3->height;
177
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->audio_stream_index = st->index;
183 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
184 st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
185 st->codecpar->codec_tag = 1;
186 st->codecpar->channels = WC3_AUDIO_CHANNELS;
187 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
188 st->codecpar->bits_per_coded_sample = WC3_AUDIO_BITS;
189 st->codecpar->sample_rate = WC3_SAMPLE_RATE;
190 st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate *
191 st->codecpar->bits_per_coded_sample;
192 st->codecpar->block_align = WC3_AUDIO_BITS * WC3_AUDIO_CHANNELS;
193
194 return 0;
195}
196
197static int wc3_read_packet(AVFormatContext *s,
198 AVPacket *pkt)
199{
200 Wc3DemuxContext *wc3 = s->priv_data;
201 AVIOContext *pb = s->pb;
202 unsigned int fourcc_tag;
203 unsigned int size;
204 int packet_read = 0;
205 int ret = 0;
206 unsigned char text[1024];
207
208 while (!packet_read) {
209
210 fourcc_tag = avio_rl32(pb);
211 /* chunk sizes are 16-bit aligned */
212 size = (avio_rb32(pb) + 1) & (~1);
213 if (avio_feof(pb))
214 return AVERROR(EIO);
215
216 switch (fourcc_tag) {
217
218 case BRCH_TAG:
219 /* no-op */
220 break;
221
222 case SHOT_TAG:
223 /* load up new palette */
224 avio_seek(pb, -8, SEEK_CUR);
225 av_append_packet(pb, &wc3->vpkt, 8 + 4);
226 break;
227
228 case VGA__TAG:
229 /* send out video chunk */
230 avio_seek(pb, -8, SEEK_CUR);
231 ret= av_append_packet(pb, &wc3->vpkt, 8 + size);
232 // ignore error if we have some data
233 if (wc3->vpkt.size > 0)
234 ret = 0;
235 *pkt = wc3->vpkt;
236 wc3->vpkt.data = NULL; wc3->vpkt.size = 0;
237 pkt->stream_index = wc3->video_stream_index;
238 pkt->pts = wc3->pts;
239 packet_read = 1;
240 break;
241
242 case TEXT_TAG:
243 /* subtitle chunk */
244 if ((unsigned)size > sizeof(text) || (ret = avio_read(pb, text, size)) != size)
245 ret = AVERROR(EIO);
246 else {
247 int i = 0;
248 av_log (s, AV_LOG_DEBUG, "Subtitle time!\n");
249 if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1)
250 return AVERROR_INVALIDDATA;
251 av_log (s, AV_LOG_DEBUG, " inglish: %s\n", &text[i + 1]);
252 i += text[i] + 1;
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, " doytsch: %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, " fronsay: %s\n", &text[i + 1]);
260 }
261 break;
262
263 case AUDI_TAG:
264 /* send out audio chunk */
265 ret= av_get_packet(pb, pkt, size);
266 pkt->stream_index = wc3->audio_stream_index;
267 pkt->pts = wc3->pts;
268
269 /* time to advance pts */
270 wc3->pts++;
271
272 packet_read = 1;
273 break;
274
275 default:
276 av_log(s, AV_LOG_ERROR, "unrecognized WC3 chunk: %s\n",
277 av_fourcc2str(fourcc_tag));
278 ret = AVERROR_INVALIDDATA;
279 packet_read = 1;
280 break;
281 }
282 }
283
284 return ret;
285}
286
287static int wc3_read_close(AVFormatContext *s)
288{
289 Wc3DemuxContext *wc3 = s->priv_data;
290
291 if (wc3->vpkt.size > 0)
292 av_packet_unref(&wc3->vpkt);
293
294 return 0;
295}
296
297AVInputFormat ff_wc3_demuxer = {
298 .name = "wc3movie",
299 .long_name = NULL_IF_CONFIG_SMALL("Wing Commander III movie"),
300 .priv_data_size = sizeof(Wc3DemuxContext),
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
generated by cgit at 2024-05-17 05:48:40 (GMT)