libmpdemux/demux_fli.c

   1 /*
   2  * FLI file parser
   3  * copyright (c) 2001 Mike Melanson
   4  *
   5  * This file is part of MPlayer.
   6  *
   7  * MPlayer is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * MPlayer 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
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  */
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25
  26 #include "config.h"
  27 #include "mp_msg.h"
  28
  29 #include "stream/stream.h"
  30 #include "demuxer.h"
  31 #include "stheader.h"
  32
  33 typedef struct {
  34   int num_frames;
  35   int current_frame;
  36   off_t *filepos;
  37   unsigned int *frame_size;
  38 } fli_frames_t;
  39
  40 static void demux_seek_fli(demuxer_t *demuxer,float rel_seek_secs,float audio_delay,int flags){
  41   fli_frames_t *frames = (fli_frames_t *)demuxer->priv;
  42   sh_video_t *sh_video = demuxer->video->sh;
  43   int newpos=(flags&SEEK_ABSOLUTE)?0:frames->current_frame;
  44   if(flags&SEEK_FACTOR){
  45       // float 0..1
  46       newpos+=rel_seek_secs*frames->num_frames;
  47   } else {
  48       // secs
  49       newpos+=rel_seek_secs*sh_video->fps;
  50   }
  51   if(newpos<0) newpos=0; else
  52   if(newpos>frames->num_frames) newpos=frames->num_frames;
  53   frames->current_frame=newpos;
  54 }
  55
  56 // return value:
  57 //     0 = EOF or no stream found
  58 //     1 = successfully read a packet
  59 static int demux_fli_fill_buffer(demuxer_t *demuxer, demux_stream_t *ds){
  60   fli_frames_t *frames = (fli_frames_t *)demuxer->priv;
  61   sh_video_t *sh_video = demuxer->video->sh;
  62
  63   // see if the end has been reached
  64   if (frames->current_frame >= frames->num_frames)
  65     return 0;
  66
  67   // fetch the frame from the file
  68   // first, position the file properly since ds_read_packet() doesn't
  69   // seem to do it, even though it takes a file offset as a parameter
  70   stream_seek(demuxer->stream, frames->filepos[frames->current_frame]);
  71   ds_read_packet(demuxer->video,
  72     demuxer->stream,
  73     frames->frame_size[frames->current_frame],
  74     frames->current_frame/sh_video->fps,
  75     frames->filepos[frames->current_frame],
  76     0 /* what flags? -> demuxer.h (alex) */
  77   );
  78
  79   // get the next frame ready
  80   frames->current_frame++;
  81
  82   return 1;
  83 }
  84
  85 static demuxer_t* demux_open_fli(demuxer_t* demuxer){
  86   sh_video_t *sh_video = NULL;
  87   fli_frames_t *frames = malloc(sizeof(fli_frames_t));
  88   int frame_number;
  89   int speed;
  90   unsigned int frame_size;
  91   int magic_number;
  92   unsigned char * header;
  93
  94   // go back to the beginning
  95   stream_reset(demuxer->stream);
  96   stream_seek(demuxer->stream, 0);
  97
  98   header = calloc(1, sizeof(BITMAPINFOHEADER) + 128);
  99   stream_read(demuxer->stream, header + sizeof(BITMAPINFOHEADER), 128);
 100   stream_seek(demuxer->stream, 0);
 101
 102   demuxer->movi_start = 128;
 103   demuxer->movi_end = stream_read_dword_le(demuxer->stream);
 104
 105   magic_number = stream_read_word_le(demuxer->stream);
 106
 107   if ((magic_number != 0xAF11) && (magic_number != 0xAF12))
 108   {
 109     mp_msg(MSGT_DEMUX, MSGL_ERR, "Bad/unknown magic number (%04x)\n",
 110         magic_number);
 111     free(header);
 112     free(frames);
 113     return NULL;
 114   }
 115
 116   // fetch the number of frames
 117   frames->num_frames = stream_read_word_le(demuxer->stream);
 118   frames->current_frame = 0;
 119
 120   // allocate enough entries for the indices
 121   //   audit: num_frames is 16bit so it is safe against overflow
 122   frames->filepos = malloc(frames->num_frames * sizeof(off_t));
 123   frames->frame_size = malloc(frames->num_frames * sizeof(int));
 124
 125   // create a new video stream header
 126   sh_video = new_sh_video(demuxer, 0);
 127
 128   // make sure the demuxer knows about the new video stream header
 129   // (even though new_sh_video() ought to take care of it)
 130   demuxer->video->sh = sh_video;
 131
 132   // make sure that the video demuxer stream header knows about its
 133   // parent video demuxer stream (this is getting wacky), or else
 134   // video_read_properties() will choke
 135   sh_video->ds = demuxer->video;
 136
 137   // custom fourcc for internal MPlayer use
 138   sh_video->format = mmioFOURCC('F', 'L', 'I', 'C');
 139
 140   sh_video->disp_w = stream_read_word_le(demuxer->stream);
 141   sh_video->disp_h = stream_read_word_le(demuxer->stream);
 142
 143   // pass extradata to codec
 144   sh_video->bih = (BITMAPINFOHEADER*)header;
 145   sh_video->bih->biSize = sizeof(BITMAPINFOHEADER) + 128;
 146   sh_video->bih->biWidth = sh_video->disp_w;
 147   sh_video->bih->biHeight = sh_video->disp_h;
 148
 149   // skip the video depth and flags
 150   stream_skip(demuxer->stream, 4);
 151
 152   // get the speed
 153   speed = stream_read_word_le(demuxer->stream);
 154   if (speed == 0)
 155     speed = 1;
 156   if (magic_number == 0xAF11)
 157     speed *= 1000/70;
 158   sh_video->fps = 1000 / speed;
 159   sh_video->frametime = 1/sh_video->fps;
 160
 161   // build the frame index
 162   stream_seek(demuxer->stream, demuxer->movi_start);
 163   frame_number = 0;
 164   while ((!stream_eof(demuxer->stream)) && (frame_number < frames->num_frames))
 165   {
 166     frames->filepos[frame_number] = stream_tell(demuxer->stream);
 167     frame_size = stream_read_dword_le(demuxer->stream);
 168     magic_number = stream_read_word_le(demuxer->stream);
 169     stream_skip(demuxer->stream, frame_size - 6);
 170
 171     // if this chunk has the right magic number, index it
 172     if ((magic_number == 0xF1FA) || (magic_number == 0xF5FA))
 173     {
 174       frames->frame_size[frame_number] = frame_size;
 175       frame_number++;
 176     }
 177   }
 178
 179   // save the actual number of frames indexed
 180   frames->num_frames = frame_number;
 181
 182   demuxer->priv = frames;
 183
 184   return demuxer;
 185 }
 186
 187 static void demux_close_fli(demuxer_t* demuxer) {
 188   fli_frames_t *frames = demuxer->priv;
 189
 190   if(!frames)
 191     return;
 192
 193   free(frames->filepos);
 194   free(frames->frame_size);
 195   free(frames);
 196
 197 }
 198
 199
 200 static int fli_check_file(demuxer_t* demuxer)
 201 {
 202   int id;
 203
 204   stream_seek(demuxer->stream, 4);
 205   id=stream_read_word_le(demuxer->stream);
 206   // check for the FLI file magic number
 207   if((id==0xAF11) || (id==0xAF12))
 208     return DEMUXER_TYPE_FLI;
 209
 210   return 0;
 211 }
 212
 213
 214 const demuxer_desc_t demuxer_desc_fli = {
 215   "Autodesk FLIC demuxer",
 216   "fli",
 217   "FLI",
 218   "Mike Melanson",
 219   "Supports also some extensions",
 220   DEMUXER_TYPE_FLI,
 221   0, // unsafe autodetect (short signature)
 222   fli_check_file,
 223   demux_fli_fill_buffer,
 224   demux_open_fli,
 225   demux_close_fli,
 226   demux_seek_fli,
 227   NULL
 228 };