aboutsummaryrefslogtreecommitdiffhomepage
path: root/libmpdemux/demux_roq.c
blob: af9e4c5a8e75857bb90ae0872b1a4ac0028032b5 (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
/*
 * RoQ file demuxer
 * copyright (c) 2002 Mike Melanson
 * based on Dr. Tim Ferguson's RoQ document found at:
 * http://www.csse.monash.edu.au/~timf/videocodec.html
 *
 * This file is part of MPlayer.
 *
 * MPlayer is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * MPlayer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with MPlayer; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

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

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

#include "stream/stream.h"
#include "demuxer.h"
#include "stheader.h"
#include "libavutil/attributes.h"

#define RoQ_INFO           0x1001
#define RoQ_QUAD_CODEBOOK  0x1002
#define RoQ_QUAD_VQ        0x1011
#define RoQ_SOUND_MONO     0x1020
#define RoQ_SOUND_STEREO   0x1021

#define CHUNK_TYPE_AUDIO 0
#define CHUNK_TYPE_VIDEO 1

typedef struct roq_chunk_t
{
  int chunk_type;
  off_t chunk_offset;
  int chunk_size;

  float video_chunk_number;  // in the case of a video chunk
  int running_audio_sample_count;  // for an audio chunk
} roq_chunk_t;

typedef struct roq_data_t
{
  int total_chunks;
  int current_chunk;
  int total_video_chunks;
  int total_audio_sample_count;
  roq_chunk_t *chunks;
} roq_data_t;

// Check if a stream qualifies as a RoQ file based on the magic numbers
// at the start of the file:
//  84 10 FF FF FF FF xx xx
static int roq_check_file(demuxer_t *demuxer)
{
  if ((stream_read_dword(demuxer->stream) == 0x8410FFFF) &&
      ((stream_read_dword(demuxer->stream) & 0xFFFF0000) == 0xFFFF0000))
    return DEMUXER_TYPE_ROQ;
  else
    return 0;
}

// return value:
//     0 = EOF or no stream found
//     1 = successfully read a packet
static int demux_roq_fill_buffer(demuxer_t *demuxer, demux_stream_t *ds)
{
  sh_video_t *sh_video = demuxer->video->sh;
  roq_data_t *roq_data = (roq_data_t *)demuxer->priv;
  roq_chunk_t roq_chunk;

  if (roq_data->current_chunk >= roq_data->total_chunks)
    return 0;

  roq_chunk = roq_data->chunks[roq_data->current_chunk];

  // make sure we're at the right place in the stream and fetch the chunk
  stream_seek(demuxer->stream, roq_chunk.chunk_offset);

  if (roq_chunk.chunk_type == CHUNK_TYPE_AUDIO)
    ds_read_packet(demuxer->audio, demuxer->stream, roq_chunk.chunk_size,
      0,
      roq_chunk.chunk_offset, 0);
  else
    ds_read_packet(demuxer->video, demuxer->stream, roq_chunk.chunk_size,
      roq_chunk.video_chunk_number / sh_video->fps,
      roq_chunk.chunk_offset, 0);

  roq_data->current_chunk++;
  return 1;
}

static demuxer_t* demux_open_roq(demuxer_t* demuxer)
{
  sh_video_t *sh_video = NULL;
  sh_audio_t *sh_audio = NULL;

  roq_data_t *roq_data = malloc(sizeof(roq_data_t));
  int chunk_id;
  int chunk_size;
  int chunk_arg av_unused;
  int last_chunk_id = 0;
  int largest_audio_chunk = 0;
  int fps;

  roq_data->total_chunks = 0;
  roq_data->current_chunk = 0;
  roq_data->total_video_chunks = 0;
  roq_data->chunks = NULL;

  // position the stream and start traversing
  stream_seek(demuxer->stream, 6);
  fps = stream_read_word_le(demuxer->stream);
  while (!stream_eof(demuxer->stream))
  {
    chunk_id = stream_read_word_le(demuxer->stream);
    chunk_size = stream_read_dword_le(demuxer->stream);
    chunk_arg = stream_read_word_le(demuxer->stream);

    // this is the only useful header info in the file
    if (chunk_id == RoQ_INFO)
    {
      // there should only be one RoQ_INFO chunk per file
      if (sh_video)
      {
        mp_msg(MSGT_DECVIDEO, MSGL_WARN, "Found more than one RoQ_INFO chunk\n");
        stream_skip(demuxer->stream, 8);
      }
      else
      {
        // this is a good opportunity to create a video stream header
        sh_video = new_sh_video(demuxer, 0);
        // make sure the demuxer knows about the new stream header
        demuxer->video->sh = sh_video;
        // make sure that the video demuxer stream header knows about its
        // parent video demuxer stream
        sh_video->ds = demuxer->video;

        sh_video->disp_w = stream_read_word_le(demuxer->stream);
        sh_video->disp_h = stream_read_word_le(demuxer->stream);
        stream_skip(demuxer->stream, 4);

        // custom fourcc for internal MPlayer use
        sh_video->format = mmioFOURCC('R', 'o', 'Q', 'V');

        // constant frame rate
        sh_video->fps = fps;
        sh_video->frametime = 1 / sh_video->fps;
      }
    }
    else if ((chunk_id == RoQ_SOUND_MONO) ||
      (chunk_id == RoQ_SOUND_STEREO))
    {
      // create the audio stream header if it hasn't been created it
      if (sh_audio == NULL)
      {
        // make the header first
        sh_audio = new_sh_audio(demuxer, 0);
        // make sure the demuxer knows about the new stream header
        demuxer->audio->id = 0;
        demuxer->audio->sh = sh_audio;
        // make sure that the audio demuxer stream header knows about its
        // parent audio demuxer stream
        sh_audio->ds = demuxer->audio;

        // go through the bother of making a WAVEFORMATEX structure
        sh_audio->wf = malloc(sizeof(*sh_audio->wf));

        // custom fourcc for internal MPlayer use
        sh_audio->format = mmioFOURCC('R', 'o', 'Q', 'A');
        if (chunk_id == RoQ_SOUND_STEREO)
          sh_audio->wf->nChannels = 2;
        else
          sh_audio->wf->nChannels = 1;
        // always 22KHz, 16-bit
        sh_audio->wf->nSamplesPerSec = 22050;
        sh_audio->wf->wBitsPerSample = 16;
      }

      // index the chunk
      roq_data->chunks = realloc(roq_data->chunks,
        (roq_data->total_chunks + 1) * sizeof (roq_chunk_t));
      roq_data->chunks[roq_data->total_chunks].chunk_type = CHUNK_TYPE_AUDIO;
      roq_data->chunks[roq_data->total_chunks].chunk_offset =
        stream_tell(demuxer->stream) - 8;
      roq_data->chunks[roq_data->total_chunks].chunk_size = chunk_size + 8;
      roq_data->chunks[roq_data->total_chunks].running_audio_sample_count =
        roq_data->total_audio_sample_count;

      // audio housekeeping
      if (chunk_size > largest_audio_chunk)
        largest_audio_chunk = chunk_size;
      roq_data->total_audio_sample_count +=
        (chunk_size / sh_audio->wf->nChannels);

      stream_skip(demuxer->stream, chunk_size);
      roq_data->total_chunks++;
    }
    else if ((chunk_id == RoQ_QUAD_CODEBOOK) ||
      ((chunk_id == RoQ_QUAD_VQ) && (last_chunk_id != RoQ_QUAD_CODEBOOK)))
    {
      // index a new chunk if it's a codebook or quad VQ not following a
      // codebook
      roq_data->chunks = realloc(roq_data->chunks,
        (roq_data->total_chunks + 1) * sizeof (roq_chunk_t));
      roq_data->chunks[roq_data->total_chunks].chunk_type = CHUNK_TYPE_VIDEO;
      roq_data->chunks[roq_data->total_chunks].chunk_offset =
        stream_tell(demuxer->stream) - 8;
      roq_data->chunks[roq_data->total_chunks].chunk_size = chunk_size + 8;
      roq_data->chunks[roq_data->total_chunks].video_chunk_number =
        roq_data->total_video_chunks++;

      stream_skip(demuxer->stream, chunk_size);
      roq_data->total_chunks++;
    }
    else if ((chunk_id == RoQ_QUAD_VQ) && (last_chunk_id == RoQ_QUAD_CODEBOOK))
    {
      // if it's a quad VQ chunk following a codebook chunk, extend the last
      // chunk
      roq_data->chunks[roq_data->total_chunks - 1].chunk_size += (chunk_size + 8);
      stream_skip(demuxer->stream, chunk_size);
    }
    else if (!stream_eof(demuxer->stream))
    {
        mp_msg(MSGT_DECVIDEO, MSGL_WARN, "Unknown RoQ chunk ID: %04X\n", chunk_id);
    }

    last_chunk_id = chunk_id;
  }

  // minimum output buffer size = largest audio chunk * 2, since each byte
  // in the DPCM encoding effectively represents 1 16-bit sample
  // (store it in wf->nBlockAlign for the time being since init_audio() will
  // step on it anyway)
  if (sh_audio)
    sh_audio->wf->nBlockAlign = largest_audio_chunk * 2;

  roq_data->current_chunk = 0;

  demuxer->priv = roq_data;

  stream_reset(demuxer->stream);

  return demuxer;
}

static void demux_close_roq(demuxer_t* demuxer) {
  roq_data_t *roq_data = demuxer->priv;

  free(roq_data);
}


const demuxer_desc_t demuxer_desc_roq = {
  "RoQ demuxer",
  "roq",
  "ROQ",
  "Mike Melanson",
  "",
  DEMUXER_TYPE_ROQ,
  0, // unsafe autodetect
  roq_check_file,
  demux_roq_fill_buffer,
  demux_open_roq,
  demux_close_roq,
  NULL,
  NULL
};