libmpdemux/demux_roq.c

   1 /*
   2  * RoQ file demuxer
   3  * copyright (c) 2002 Mike Melanson
   4  * based on Dr. Tim Ferguson's RoQ document found at:
   5  * http://www.csse.monash.edu.au/~timf/videocodec.html
   6  *
   7  * This file is part of MPlayer.
   8  *
   9  * MPlayer is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * MPlayer is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  22  */
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <unistd.h>
  27
  28 #include "config.h"
  29 #include "mp_msg.h"
  30
  31 #include "stream/stream.h"
  32 #include "demuxer.h"
  33 #include "stheader.h"
  34
  35 #define RoQ_INFO           0x1001
  36 #define RoQ_QUAD_CODEBOOK  0x1002
  37 #define RoQ_QUAD_VQ        0x1011
  38 #define RoQ_SOUND_MONO     0x1020
  39 #define RoQ_SOUND_STEREO   0x1021
  40
  41 #define CHUNK_TYPE_AUDIO 0
  42 #define CHUNK_TYPE_VIDEO 1
  43
  44 typedef struct roq_chunk_t
  45 {
  46   int chunk_type;
  47   off_t chunk_offset;
  48   int chunk_size;
  49
  50   float video_chunk_number;  // in the case of a video chunk
  51   int running_audio_sample_count;  // for an audio chunk
  52 } roq_chunk_t;
  53
  54 typedef struct roq_data_t
  55 {
  56   int total_chunks;
  57   int current_chunk;
  58   int total_video_chunks;
  59   int total_audio_sample_count;
  60   roq_chunk_t *chunks;
  61 } roq_data_t;
  62
  63 // Check if a stream qualifies as a RoQ file based on the magic numbers
  64 // at the start of the file:
  65 //  84 10 FF FF FF FF xx xx
  66 static int roq_check_file(demuxer_t *demuxer)
  67 {
  68   if ((stream_read_dword(demuxer->stream) == 0x8410FFFF) &&
  69       ((stream_read_dword(demuxer->stream) & 0xFFFF0000) == 0xFFFF0000))
  70     return DEMUXER_TYPE_ROQ;
  71   else
  72     return 0;
  73 }
  74
  75 // return value:
  76 //     0 = EOF or no stream found
  77 //     1 = successfully read a packet
  78 static int demux_roq_fill_buffer(demuxer_t *demuxer, demux_stream_t *ds)
  79 {
  80   sh_video_t *sh_video = demuxer->video->sh;
  81   roq_data_t *roq_data = (roq_data_t *)demuxer->priv;
  82   roq_chunk_t roq_chunk;
  83
  84   if (roq_data->current_chunk >= roq_data->total_chunks)
  85     return 0;
  86
  87   roq_chunk = roq_data->chunks[roq_data->current_chunk];
  88
  89   // make sure we're at the right place in the stream and fetch the chunk
  90   stream_seek(demuxer->stream, roq_chunk.chunk_offset);
  91
  92   if (roq_chunk.chunk_type == CHUNK_TYPE_AUDIO)
  93     ds_read_packet(demuxer->audio, demuxer->stream, roq_chunk.chunk_size,
  94       0,
  95       roq_chunk.chunk_offset, 0);
  96   else
  97     ds_read_packet(demuxer->video, demuxer->stream, roq_chunk.chunk_size,
  98       roq_chunk.video_chunk_number / sh_video->fps,
  99       roq_chunk.chunk_offset, 0);
 100
 101   roq_data->current_chunk++;
 102   return 1;
 103 }
 104
 105 static demuxer_t* demux_open_roq(demuxer_t* demuxer)
 106 {
 107   sh_video_t *sh_video = NULL;
 108   sh_audio_t *sh_audio = NULL;
 109
 110   roq_data_t *roq_data = malloc(sizeof(roq_data_t));
 111   int chunk_id;
 112   int chunk_size;
 113   int chunk_arg;
 114   int last_chunk_id = 0;
 115   int largest_audio_chunk = 0;
 116   int fps;
 117
 118   roq_data->total_chunks = 0;
 119   roq_data->current_chunk = 0;
 120   roq_data->total_video_chunks = 0;
 121   roq_data->chunks = NULL;
 122
 123   // position the stream and start traversing
 124   stream_seek(demuxer->stream, 6);
 125   fps = stream_read_word_le(demuxer->stream);
 126   while (!stream_eof(demuxer->stream))
 127   {
 128     chunk_id = stream_read_word_le(demuxer->stream);
 129     chunk_size = stream_read_dword_le(demuxer->stream);
 130     chunk_arg = stream_read_word_le(demuxer->stream);
 131
 132     // this is the only useful header info in the file
 133     if (chunk_id == RoQ_INFO)
 134     {
 135       // there should only be one RoQ_INFO chunk per file
 136       if (sh_video)
 137       {
 138         mp_msg(MSGT_DECVIDEO, MSGL_WARN, "Found more than one RoQ_INFO chunk\n");
 139         stream_skip(demuxer->stream, 8);
 140       }
 141       else
 142       {
 143         // this is a good opportunity to create a video stream header
 144         sh_video = new_sh_video(demuxer, 0);
 145         // make sure the demuxer knows about the new stream header
 146         demuxer->video->sh = sh_video;
 147         // make sure that the video demuxer stream header knows about its
 148         // parent video demuxer stream
 149         sh_video->ds = demuxer->video;
 150
 151         sh_video->disp_w = stream_read_word_le(demuxer->stream);
 152         sh_video->disp_h = stream_read_word_le(demuxer->stream);
 153         stream_skip(demuxer->stream, 4);
 154
 155         // custom fourcc for internal MPlayer use
 156         sh_video->format = mmioFOURCC('R', 'o', 'Q', 'V');
 157
 158         // constant frame rate
 159         sh_video->fps = fps;
 160         sh_video->frametime = 1 / sh_video->fps;
 161       }
 162     }
 163     else if ((chunk_id == RoQ_SOUND_MONO) ||
 164       (chunk_id == RoQ_SOUND_STEREO))
 165     {
 166       // create the audio stream header if it hasn't been created it
 167       if (sh_audio == NULL)
 168       {
 169         // make the header first
 170         sh_audio = new_sh_audio(demuxer, 0);
 171         // make sure the demuxer knows about the new stream header
 172         demuxer->audio->id = 0;
 173         demuxer->audio->sh = sh_audio;
 174         // make sure that the audio demuxer stream header knows about its
 175         // parent audio demuxer stream
 176         sh_audio->ds = demuxer->audio;
 177
 178         // go through the bother of making a WAVEFORMATEX structure
 179         sh_audio->wf = malloc(sizeof(WAVEFORMATEX));
 180
 181         // custom fourcc for internal MPlayer use
 182         sh_audio->format = mmioFOURCC('R', 'o', 'Q', 'A');
 183         if (chunk_id == RoQ_SOUND_STEREO)
 184           sh_audio->wf->nChannels = 2;
 185         else
 186           sh_audio->wf->nChannels = 1;
 187         // always 22KHz, 16-bit
 188         sh_audio->wf->nSamplesPerSec = 22050;
 189         sh_audio->wf->wBitsPerSample = 16;
 190       }
 191
 192       // index the chunk
 193       roq_data->chunks = realloc(roq_data->chunks,
 194         (roq_data->total_chunks + 1) * sizeof (roq_chunk_t));
 195       roq_data->chunks[roq_data->total_chunks].chunk_type = CHUNK_TYPE_AUDIO;
 196       roq_data->chunks[roq_data->total_chunks].chunk_offset =
 197         stream_tell(demuxer->stream) - 8;
 198       roq_data->chunks[roq_data->total_chunks].chunk_size = chunk_size + 8;
 199       roq_data->chunks[roq_data->total_chunks].running_audio_sample_count =
 200         roq_data->total_audio_sample_count;
 201
 202       // audio housekeeping
 203       if (chunk_size > largest_audio_chunk)
 204         largest_audio_chunk = chunk_size;
 205       roq_data->total_audio_sample_count +=
 206         (chunk_size / sh_audio->wf->nChannels);
 207
 208       stream_skip(demuxer->stream, chunk_size);
 209       roq_data->total_chunks++;
 210     }
 211     else if ((chunk_id == RoQ_QUAD_CODEBOOK) ||
 212       ((chunk_id == RoQ_QUAD_VQ) && (last_chunk_id != RoQ_QUAD_CODEBOOK)))
 213     {
 214       // index a new chunk if it's a codebook or quad VQ not following a
 215       // codebook
 216       roq_data->chunks = realloc(roq_data->chunks,
 217         (roq_data->total_chunks + 1) * sizeof (roq_chunk_t));
 218       roq_data->chunks[roq_data->total_chunks].chunk_type = CHUNK_TYPE_VIDEO;
 219       roq_data->chunks[roq_data->total_chunks].chunk_offset =
 220         stream_tell(demuxer->stream) - 8;
 221       roq_data->chunks[roq_data->total_chunks].chunk_size = chunk_size + 8;
 222       roq_data->chunks[roq_data->total_chunks].video_chunk_number =
 223         roq_data->total_video_chunks++;
 224
 225       stream_skip(demuxer->stream, chunk_size);
 226       roq_data->total_chunks++;
 227     }
 228     else if ((chunk_id == RoQ_QUAD_VQ) && (last_chunk_id == RoQ_QUAD_CODEBOOK))
 229     {
 230       // if it's a quad VQ chunk following a codebook chunk, extend the last
 231       // chunk
 232       roq_data->chunks[roq_data->total_chunks - 1].chunk_size += (chunk_size + 8);
 233       stream_skip(demuxer->stream, chunk_size);
 234     }
 235     else if (!stream_eof(demuxer->stream))
 236     {
 237         mp_msg(MSGT_DECVIDEO, MSGL_WARN, "Unknown RoQ chunk ID: %04X\n", chunk_id);
 238     }
 239
 240     last_chunk_id = chunk_id;
 241   }
 242
 243   // minimum output buffer size = largest audio chunk * 2, since each byte
 244   // in the DPCM encoding effectively represents 1 16-bit sample
 245   // (store it in wf->nBlockAlign for the time being since init_audio() will
 246   // step on it anyway)
 247   if (sh_audio)
 248     sh_audio->wf->nBlockAlign = largest_audio_chunk * 2;
 249
 250   roq_data->current_chunk = 0;
 251
 252   demuxer->priv = roq_data;
 253
 254   stream_reset(demuxer->stream);
 255
 256   return demuxer;
 257 }
 258
 259 static void demux_close_roq(demuxer_t* demuxer) {
 260   roq_data_t *roq_data = demuxer->priv;
 261
 262   if(!roq_data)
 263     return;
 264   free(roq_data);
 265 }
 266
 267
 268 const demuxer_desc_t demuxer_desc_roq = {
 269   "RoQ demuxer",
 270   "roq",
 271   "ROQ",
 272   "Mike Melanson",
 273   "",
 274   DEMUXER_TYPE_ROQ,
 275   0, // unsafe autodetect
 276   roq_check_file,
 277   demux_roq_fill_buffer,
 278   demux_open_roq,
 279   demux_close_roq,
 280   NULL,
 281   NULL
 282 };