aboutsummaryrefslogtreecommitdiffhomepage
path: root/libmpdemux/demux_film.c
blob: 2b0b9a59483ce350637b489a0a8c285a5c9c5290 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
/*
    FILM file parser for the MPlayer program
      by Mike Melanson

    This demuxer handles FILM (a.k.a. CPK) files commonly found on
    Sega Saturn CD-ROM games. FILM files have also been found on 3DO
    games.

    Details of the FILM file format can be found at:
      http://www.pcisys.net/~melanson/codecs/
*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"

#include "stream.h"
#include "demuxer.h"
#include "stheader.h"

// chunk types found in a FILM file
#define CHUNK_FILM mmioFOURCC('F', 'I', 'L', 'M')
#define CHUNK_FDSC mmioFOURCC('F', 'D', 'S', 'C')
#define CHUNK_STAB mmioFOURCC('S', 'T', 'A', 'B')

typedef struct _film_chunk_t
{
  off_t chunk_offset;
  int chunk_size;
  unsigned int syncinfo1;
  unsigned int syncinfo2;

  float pts;
} film_chunk_t;

typedef struct _film_data_t
{
  unsigned int total_chunks;
  unsigned int current_chunk;
  film_chunk_t *chunks;
  unsigned int chunks_per_second;
  unsigned int film_version;
} film_data_t;

void demux_seek_film(demuxer_t *demuxer, float rel_seek_secs, int flags)
{
  film_data_t *film_data = (film_data_t *)demuxer->priv;
  int new_current_chunk=(flags&1)?0:film_data->current_chunk;

  if(flags&2)
      new_current_chunk += rel_seek_secs * film_data->total_chunks; // 0..1
  else
      new_current_chunk += rel_seek_secs * film_data->chunks_per_second; // secs


printf ("current, total chunks = %d, %d; seek %5.3f sec, new chunk guess = %d\n",
  film_data->current_chunk, film_data->total_chunks,
  rel_seek_secs, new_current_chunk);

  // check if the new chunk number is valid
  if (new_current_chunk < 0)
    new_current_chunk = 0;
  if ((unsigned int)new_current_chunk > film_data->total_chunks)
    new_current_chunk = film_data->total_chunks - 1;

  while (((film_data->chunks[new_current_chunk].syncinfo1 == 0xFFFFFFFF) ||
    (film_data->chunks[new_current_chunk].syncinfo1 & 0x80000000)) &&
    (new_current_chunk > 0))
    new_current_chunk--;

  film_data->current_chunk = new_current_chunk;

printf ("  (flags = %X)  actual new chunk = %d (syncinfo1 = %08X)\n",
  flags, film_data->current_chunk, film_data->chunks[film_data->current_chunk].syncinfo1);
  demuxer->video->pts=film_data->chunks[film_data->current_chunk].pts;
  
}

// return value:
//     0 = EOF or no stream found
//     1 = successfully read a packet
int demux_film_fill_buffer(demuxer_t *demuxer)
{
  int i;
  unsigned char byte_swap;
  int cvid_size;
  sh_video_t *sh_video = demuxer->video->sh;
  sh_audio_t *sh_audio = demuxer->audio->sh;
  film_data_t *film_data = (film_data_t *)demuxer->priv;
  film_chunk_t film_chunk;
  int length_fix_bytes;
  demux_packet_t* dp;

  // see if the end has been reached
  if (film_data->current_chunk >= film_data->total_chunks)
    return 0;

  film_chunk = film_data->chunks[film_data->current_chunk];

  // position stream and fetch chunk
  stream_seek(demuxer->stream, film_chunk.chunk_offset);

  // load the chunks manually (instead of using ds_read_packet()), since
  // they require some adjustment
  // (all ones in syncinfo1 indicates an audio chunk)
  if (film_chunk.syncinfo1 == 0xFFFFFFFF)
  {
   if(demuxer->audio->id>=-1){   // audio not disabled
    dp = new_demux_packet(film_chunk.chunk_size);
    if (stream_read(demuxer->stream, dp->buffer, film_chunk.chunk_size) !=
      film_chunk.chunk_size)
      return 0;
    dp->pts = film_chunk.pts;
    dp->pos = film_chunk.chunk_offset;
    dp->flags = 0;

    // adjust the data before queuing it:
    //   8-bit: signed -> unsigned
    //  16-bit: big-endian -> little-endian
    if (sh_audio->wf->wBitsPerSample == 8)
      for (i = 0; i < film_chunk.chunk_size; i++)
        dp->buffer[i] += 128;
    else
      for (i = 0; i < film_chunk.chunk_size; i += 2)
      {
        byte_swap = dp->buffer[i];
        dp->buffer[i] = dp->buffer[i + 1];
        dp->buffer[i + 1] = byte_swap;
      }

    // append packet to DS stream
    ds_add_packet(demuxer->audio, dp);
   }
  }
  else
  {
    // if the demuxer is dealing with CVID data, deal with it a special way
    if (sh_video->format == mmioFOURCC('c', 'v', 'i', 'd'))
    {
      if (film_data->film_version)
        length_fix_bytes = 2;
      else
        length_fix_bytes = 6;

      // account for the fix bytes when allocating the buffer
      dp = new_demux_packet(film_chunk.chunk_size - length_fix_bytes);

      // these CVID data chunks have a few extra bytes; skip them
      if (stream_read(demuxer->stream, dp->buffer, 10) != 10)
        return 0;
      stream_skip(demuxer->stream, length_fix_bytes);

      if (stream_read(demuxer->stream, dp->buffer + 10, 
        film_chunk.chunk_size - (10 + length_fix_bytes)) != 
        (film_chunk.chunk_size - (10 + length_fix_bytes)))
        return 0;

      dp->pts = film_chunk.pts;
      dp->pos = film_chunk.chunk_offset;
      dp->flags = (film_chunk.syncinfo1 & 0x80000000) ? 1 : 0;

      // fix the CVID chunk size
      cvid_size = film_chunk.chunk_size - length_fix_bytes;
      dp->buffer[1] = (cvid_size >> 16) & 0xFF;
      dp->buffer[2] = (cvid_size >>  8) & 0xFF;
      dp->buffer[3] = (cvid_size >>  0) & 0xFF;

      // append packet to DS stream
      ds_add_packet(demuxer->video, dp);
    }
    else
    {
      ds_read_packet(demuxer->video, demuxer->stream, film_chunk.chunk_size,
        film_chunk.pts,
        film_chunk.chunk_offset, (film_chunk.syncinfo1 & 0x80000000) ? 1 : 0);
    }
  }
  film_data->current_chunk++;

  return 1;
}

demuxer_t* demux_open_film(demuxer_t* demuxer)
{
  sh_video_t *sh_video = NULL;
  sh_audio_t *sh_audio = NULL;
  film_data_t *film_data;
  film_chunk_t film_chunk;
  int header_size;
  unsigned int chunk_type;
  unsigned int chunk_size;
  unsigned int i;
  unsigned int video_format;
  int audio_channels;
  int counting_chunks;
  unsigned int total_audio_bytes = 0;

  film_data = (film_data_t *)malloc(sizeof(film_data_t));
  film_data->total_chunks = 0;
  film_data->current_chunk = 0;
  film_data->chunks = NULL;
  film_data->chunks_per_second = 0;

  // go back to the beginning
  stream_reset(demuxer->stream);
  stream_seek(demuxer->stream, 0);

  // read the master chunk type
  chunk_type = stream_read_fourcc(demuxer->stream);
  // validate the chunk type
  if (chunk_type != CHUNK_FILM)
  {
    mp_msg(MSGT_DEMUX, MSGL_ERR, "Not a FILM file\n");
    return(NULL);    
  }

  // get the header size, which implicitly points past the header and
  // to the start of the data
  header_size = stream_read_dword(demuxer->stream);
  film_data->film_version = stream_read_fourcc(demuxer->stream);
  demuxer->movi_start = header_size;
  demuxer->movi_end = demuxer->stream->end_pos;
  header_size -= 16;

  mp_msg(MSGT_DEMUX, MSGL_HINT, "FILM version %.4s\n",
    &film_data->film_version);

  // skip to where the next chunk should be
  stream_skip(demuxer->stream, 4);

  // traverse through the header
  while (header_size > 0)
  {
    // fetch the chunk type and size
    chunk_type = stream_read_fourcc(demuxer->stream);
    chunk_size = stream_read_dword(demuxer->stream);
    header_size -= chunk_size;

    switch (chunk_type)
    {
    case CHUNK_FDSC:
      mp_msg(MSGT_DECVIDEO, MSGL_V, "parsing FDSC chunk\n");

      // fetch the video codec fourcc to see if there's any video
      video_format = stream_read_fourcc(demuxer->stream);
      if (video_format)
      {
        // create and initialize the video stream header
        sh_video = new_sh_video(demuxer, 0);
        demuxer->video->sh = sh_video;
        sh_video->ds = demuxer->video;

        sh_video->format = video_format;
        sh_video->disp_h = stream_read_dword(demuxer->stream);
        sh_video->disp_w = stream_read_dword(demuxer->stream);
        mp_msg(MSGT_DECVIDEO, MSGL_V,
          "  FILM video: %d x %d\n", sh_video->disp_w,
          sh_video->disp_h);
      }
      else
        // skip height and width if no video
        stream_skip(demuxer->stream, 8);

      if(demuxer->audio->id<-1){
          printf("chunk size = 0x%X \n",chunk_size);
	stream_skip(demuxer->stream, chunk_size-12-8);
	break; // audio disabled (or no soundcard)
      }

      // skip over unknown byte, but only if file had non-NULL version
      if (film_data->film_version)
        stream_skip(demuxer->stream, 1);

      // fetch the audio channels to see if there's any audio
      // don't do this if the file is a quirky file with NULL version
      if (film_data->film_version)
      {
        audio_channels = stream_read_char(demuxer->stream);
        if (audio_channels > 0)
        {
          // create and initialize the audio stream header
          sh_audio = new_sh_audio(demuxer, 0);
          demuxer->audio->sh = sh_audio;
          sh_audio->ds = demuxer->audio;

          sh_audio->wf = (WAVEFORMATEX *)malloc(sizeof(WAVEFORMATEX));

          // uncompressed PCM format
          sh_audio->wf->wFormatTag = 1;
          sh_audio->format = 1;
          sh_audio->wf->nChannels = audio_channels;
          sh_audio->wf->wBitsPerSample = stream_read_char(demuxer->stream);
          stream_skip(demuxer->stream, 1);  // skip unknown byte
          sh_audio->wf->nSamplesPerSec = stream_read_word(demuxer->stream);
          sh_audio->wf->nAvgBytesPerSec = 
            sh_audio->wf->nSamplesPerSec * sh_audio->wf->wBitsPerSample 
            * sh_audio->wf->nChannels / 8;
          stream_skip(demuxer->stream, 6);  // skip the rest of the unknown

          mp_msg(MSGT_DECVIDEO, MSGL_V,
            "  FILM audio: %d channels, %d bits, %d Hz\n",
            sh_audio->wf->nChannels, 8 * sh_audio->wf->wBitsPerSample, 
            sh_audio->wf->nSamplesPerSec);
        }
        else
          stream_skip(demuxer->stream, 10);
      }
      else
      {
        // otherwise, make some assumptions about the audio

        // create and initialize the audio stream header
        sh_audio = new_sh_audio(demuxer, 0);
        demuxer->audio->sh = sh_audio;
        sh_audio->ds = demuxer->audio;

        sh_audio->wf = (WAVEFORMATEX *)malloc(sizeof(WAVEFORMATEX));

        // uncompressed PCM format
        sh_audio->wf->wFormatTag = 1;
        sh_audio->format = 1;
        sh_audio->wf->nChannels = 1;
        sh_audio->wf->wBitsPerSample = 8;
        sh_audio->wf->nSamplesPerSec = 22050;
        sh_audio->wf->nAvgBytesPerSec = 
          sh_audio->wf->nSamplesPerSec * sh_audio->wf->wBitsPerSample 
          * sh_audio->wf->nChannels / 8;

        mp_msg(MSGT_DECVIDEO, MSGL_V,
          "  FILM audio: %d channels, %d bits, %d Hz\n",
          sh_audio->wf->nChannels, sh_audio->wf->wBitsPerSample, 
          sh_audio->wf->nSamplesPerSec);
      }
      break;

    case CHUNK_STAB:
      mp_msg(MSGT_DECVIDEO, MSGL_V, "parsing STAB chunk\n");

      if (sh_video)
      {
        sh_video->fps = stream_read_dword(demuxer->stream);
        sh_video->frametime = 1.0 / sh_video->fps;
      }

      // fetch the number of chunks
      film_data->total_chunks = stream_read_dword(demuxer->stream);
      film_data->current_chunk = 0;
      mp_msg(MSGT_DECVIDEO, MSGL_V,
        "  STAB chunk contains %d chunks\n", film_data->total_chunks);

      // allocate enough entries for the chunk
      film_data->chunks = 
        (film_chunk_t *)malloc(film_data->total_chunks * sizeof(film_chunk_t));

      // build the chunk index
      counting_chunks = 1;
      for (i = 0; i < film_data->total_chunks; i++)
      {
        film_chunk = film_data->chunks[i];
        film_chunk.chunk_offset = 
          demuxer->movi_start + stream_read_dword(demuxer->stream);
        film_chunk.chunk_size = stream_read_dword(demuxer->stream);
        film_chunk.syncinfo1 = stream_read_dword(demuxer->stream);
        film_chunk.syncinfo2 = stream_read_dword(demuxer->stream);

        // count chunks for the purposes of seeking
        if (counting_chunks)
        {
          // if we're counting chunks, always count an audio chunk
          if (film_chunk.syncinfo1 == 0xFFFFFFFF)
            film_data->chunks_per_second++;
          // if it's a video chunk, check if it's time to stop counting
          else if ((film_chunk.syncinfo1 & 0x7FFFFFFF) >= sh_video->fps)
            counting_chunks = 0;
          else
            film_data->chunks_per_second++;
        }

        // precalculate PTS
        if (film_chunk.syncinfo1 == 0xFFFFFFFF)
        {
	  if(demuxer->audio->id>=-1)
          film_chunk.pts =
            (float)total_audio_bytes / (float)sh_audio->wf->nAvgBytesPerSec;
          total_audio_bytes += film_chunk.chunk_size;
        }
        else
          film_chunk.pts =
            (film_chunk.syncinfo1 & 0x7FFFFFFF) / sh_video->fps;

        film_data->chunks[i] = film_chunk;
      }

      // in some FILM files (notably '1.09'), the length of the FDSC chunk
      // follows different rules
      if (chunk_size == (film_data->total_chunks * 16))
        header_size -= 16;
      break;

    default:
      mp_msg(MSGT_DEMUX, MSGL_ERR, "Unrecognized FILM header chunk: %08X\n",
        chunk_type);
      return(NULL);    
      break;
    }
  }

  demuxer->priv = film_data;

  return demuxer;
}

void demux_close_film(demuxer_t* demuxer) {
  film_data_t *film_data = demuxer->priv;

  if(!film_data)
    return;
  if(film_data->chunks)
    free(film_data->chunks);
  free(film_data);
  
}