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wc3movie.c
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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 
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 (url_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 (url_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 };
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