FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
wc3movie.c
Go to the documentation of this file.
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 
31 #include "libavutil/intreadwrite.h"
32 #include "libavutil/dict.h"
33 #include "avformat.h"
34 #include "internal.h"
35 
36 #define FORM_TAG MKTAG('F', 'O', 'R', 'M')
37 #define MOVE_TAG MKTAG('M', 'O', 'V', 'E')
38 #define PC__TAG MKTAG('_', 'P', 'C', '_')
39 #define SOND_TAG MKTAG('S', 'O', 'N', 'D')
40 #define BNAM_TAG MKTAG('B', 'N', 'A', 'M')
41 #define SIZE_TAG MKTAG('S', 'I', 'Z', 'E')
42 #define PALT_TAG MKTAG('P', 'A', 'L', 'T')
43 #define INDX_TAG MKTAG('I', 'N', 'D', 'X')
44 #define BRCH_TAG MKTAG('B', 'R', 'C', 'H')
45 #define SHOT_TAG MKTAG('S', 'H', 'O', 'T')
46 #define VGA__TAG MKTAG('V', 'G', 'A', ' ')
47 #define TEXT_TAG MKTAG('T', 'E', 'X', 'T')
48 #define AUDI_TAG MKTAG('A', 'U', 'D', 'I')
49 
50 /* video resolution unless otherwise specified */
51 #define WC3_DEFAULT_WIDTH 320
52 #define WC3_DEFAULT_HEIGHT 165
53 
54 /* always use the same PCM audio parameters */
55 #define WC3_SAMPLE_RATE 22050
56 #define WC3_AUDIO_CHANNELS 1
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 
64 typedef struct Wc3DemuxContext {
65  int width;
66  int height;
67  int64_t pts;
70 
72 
74 
75 static int wc3_probe(AVProbeData *p)
76 {
77  if (p->buf_size < 12)
78  return 0;
79 
80  if ((AV_RL32(&p->buf[0]) != FORM_TAG) ||
81  (AV_RL32(&p->buf[8]) != MOVE_TAG))
82  return 0;
83 
84  return AVPROBE_SCORE_MAX;
85 }
86 
88 {
89  Wc3DemuxContext *wc3 = s->priv_data;
90  AVIOContext *pb = s->pb;
91  unsigned int fourcc_tag;
92  unsigned int size;
93  AVStream *st;
94  int ret = 0;
95  char *buffer;
96 
97  /* default context members */
98  wc3->width = WC3_DEFAULT_WIDTH;
100  wc3->pts = 0;
101  wc3->video_stream_index = wc3->audio_stream_index = 0;
102  av_init_packet(&wc3->vpkt);
103  wc3->vpkt.data = NULL; wc3->vpkt.size = 0;
104 
105  /* skip the first 3 32-bit numbers */
106  avio_skip(pb, 12);
107 
108  /* traverse through the chunks and load the header information before
109  * the first BRCH tag */
110  fourcc_tag = avio_rl32(pb);
111  size = (avio_rb32(pb) + 1) & (~1);
112 
113  do {
114  switch (fourcc_tag) {
115 
116  case SOND_TAG:
117  case INDX_TAG:
118  /* SOND unknown, INDX unnecessary; ignore both */
119  avio_skip(pb, size);
120  break;
121 
122  case PC__TAG:
123  /* number of palettes, unneeded */
124  avio_skip(pb, 12);
125  break;
126 
127  case BNAM_TAG:
128  /* load up the name */
129  buffer = av_malloc(size+1);
130  if (!buffer)
131  return AVERROR(ENOMEM);
132  if ((ret = avio_read(pb, buffer, size)) != size)
133  return AVERROR(EIO);
134  buffer[size] = 0;
135  av_dict_set(&s->metadata, "title", buffer,
137  break;
138 
139  case SIZE_TAG:
140  /* video resolution override */
141  wc3->width = avio_rl32(pb);
142  wc3->height = avio_rl32(pb);
143  break;
144 
145  case PALT_TAG:
146  /* one of several palettes */
147  avio_seek(pb, -8, SEEK_CUR);
148  av_append_packet(pb, &wc3->vpkt, 8 + PALETTE_SIZE);
149  break;
150 
151  default:
152  av_log(s, AV_LOG_ERROR, " unrecognized WC3 chunk: %c%c%c%c (0x%02X%02X%02X%02X)\n",
153  (uint8_t)fourcc_tag, (uint8_t)(fourcc_tag >> 8), (uint8_t)(fourcc_tag >> 16), (uint8_t)(fourcc_tag >> 24),
154  (uint8_t)fourcc_tag, (uint8_t)(fourcc_tag >> 8), (uint8_t)(fourcc_tag >> 16), (uint8_t)(fourcc_tag >> 24));
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 (url_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);
171  wc3->video_stream_index = st->index;
174  st->codec->codec_tag = 0; /* no fourcc */
175  st->codec->width = wc3->width;
176  st->codec->height = wc3->height;
177 
178  st = avformat_new_stream(s, NULL);
179  if (!st)
180  return AVERROR(ENOMEM);
182  wc3->audio_stream_index = st->index;
185  st->codec->codec_tag = 1;
190  st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
193 
194  return 0;
195 }
196 
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 (url_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 0
245  avio_skip(pb, size);
246 #else
247  if ((unsigned)size > sizeof(text) || (ret = avio_read(pb, text, size)) != size)
248  ret = AVERROR(EIO);
249  else {
250  int i = 0;
251  av_log (s, AV_LOG_DEBUG, "Subtitle time!\n");
252  av_log (s, AV_LOG_DEBUG, " inglish: %s\n", &text[i + 1]);
253  i += text[i] + 1;
254  av_log (s, AV_LOG_DEBUG, " doytsch: %s\n", &text[i + 1]);
255  i += text[i] + 1;
256  av_log (s, AV_LOG_DEBUG, " fronsay: %s\n", &text[i + 1]);
257  }
258 #endif
259  break;
260 
261  case AUDI_TAG:
262  /* send out audio chunk */
263  ret= av_get_packet(pb, pkt, size);
264  pkt->stream_index = wc3->audio_stream_index;
265  pkt->pts = wc3->pts;
266 
267  /* time to advance pts */
268  wc3->pts++;
269 
270  packet_read = 1;
271  break;
272 
273  default:
274  av_log (s, AV_LOG_ERROR, " unrecognized WC3 chunk: %c%c%c%c (0x%02X%02X%02X%02X)\n",
275  (uint8_t)fourcc_tag, (uint8_t)(fourcc_tag >> 8), (uint8_t)(fourcc_tag >> 16), (uint8_t)(fourcc_tag >> 24),
276  (uint8_t)fourcc_tag, (uint8_t)(fourcc_tag >> 8), (uint8_t)(fourcc_tag >> 16), (uint8_t)(fourcc_tag >> 24));
277  ret = AVERROR_INVALIDDATA;
278  packet_read = 1;
279  break;
280  }
281  }
282 
283  return ret;
284 }
285 
287 {
288  Wc3DemuxContext *wc3 = s->priv_data;
289 
290  if (wc3->vpkt.size > 0)
291  av_free_packet(&wc3->vpkt);
292 
293  return 0;
294 }
295 
297  .name = "wc3movie",
298  .long_name = NULL_IF_CONFIG_SMALL("Wing Commander III movie"),
299  .priv_data_size = sizeof(Wc3DemuxContext),
304 };