libmpdemux/demux_fli.c

   1 /*
   2         FLI file parser for the MPlayer program
   3         by Mike Melanson
   4 */
   5
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <unistd.h>
   9
  10 #include "config.h"
  11 #include "mp_msg.h"
  12 #include "help_mp.h"
  13
  14 #include "stream/stream.h"
  15 #include "demuxer.h"
  16 #include "stheader.h"
  17
  18 typedef struct {
  19   int num_frames;
  20   int current_frame;
  21   off_t *filepos;
  22   unsigned int *frame_size;
  23 } fli_frames_t;
  24
  25 static void demux_seek_fli(demuxer_t *demuxer,float rel_seek_secs,float audio_delay,int flags){
  26   fli_frames_t *frames = (fli_frames_t *)demuxer->priv;
  27   sh_video_t *sh_video = demuxer->video->sh;
  28   int newpos=(flags&SEEK_ABSOLUTE)?0:frames->current_frame;
  29   if(flags&SEEK_FACTOR){
  30       // float 0..1
  31       newpos+=rel_seek_secs*frames->num_frames;
  32   } else {
  33       // secs
  34       newpos+=rel_seek_secs*sh_video->fps;
  35   }
  36   if(newpos<0) newpos=0; else
  37   if(newpos>frames->num_frames) newpos=frames->num_frames;
  38   frames->current_frame=newpos;
  39 }
  40
  41 // return value:
  42 //     0 = EOF or no stream found
  43 //     1 = successfully read a packet
  44 static int demux_fli_fill_buffer(demuxer_t *demuxer, demux_stream_t *ds){
  45   fli_frames_t *frames = (fli_frames_t *)demuxer->priv;
  46   sh_video_t *sh_video = demuxer->video->sh;
  47
  48   // see if the end has been reached
  49   if (frames->current_frame >= frames->num_frames)
  50     return 0;
  51
  52   // fetch the frame from the file
  53   // first, position the file properly since ds_read_packet() doesn't
  54   // seem to do it, even though it takes a file offset as a parameter
  55   stream_seek(demuxer->stream, frames->filepos[frames->current_frame]);
  56   ds_read_packet(demuxer->video,
  57     demuxer->stream,
  58     frames->frame_size[frames->current_frame],
  59     frames->current_frame/sh_video->fps,
  60     frames->filepos[frames->current_frame],
  61     0 /* what flags? -> demuxer.h (alex) */
  62   );
  63
  64   // get the next frame ready
  65   frames->current_frame++;
  66
  67   return 1;
  68 }
  69
  70 static demuxer_t* demux_open_fli(demuxer_t* demuxer){
  71   sh_video_t *sh_video = NULL;
  72   fli_frames_t *frames = malloc(sizeof(fli_frames_t));
  73   int frame_number;
  74   int speed;
  75   unsigned int frame_size;
  76   int magic_number;
  77   unsigned char * header;
  78
  79   // go back to the beginning
  80   stream_reset(demuxer->stream);
  81   stream_seek(demuxer->stream, 0);
  82
  83   header = calloc(1, sizeof(BITMAPINFOHEADER) + 128);
  84   stream_read(demuxer->stream, header + sizeof(BITMAPINFOHEADER), 128);
  85   stream_seek(demuxer->stream, 0);
  86
  87   demuxer->movi_start = 128;
  88   demuxer->movi_end = stream_read_dword_le(demuxer->stream);
  89
  90   magic_number = stream_read_word_le(demuxer->stream);
  91
  92   if ((magic_number != 0xAF11) && (magic_number != 0xAF12))
  93   {
  94     mp_msg(MSGT_DEMUX, MSGL_ERR, "Bad/unknown magic number (%04x)\n",
  95         magic_number);
  96     free(header);
  97     free(frames);
  98     return NULL;
  99   }
 100
 101   // fetch the number of frames
 102   frames->num_frames = stream_read_word_le(demuxer->stream);
 103   frames->current_frame = 0;
 104
 105   // allocate enough entries for the indices
 106   //   audit: num_frames is 16bit so it is safe against overflow
 107   frames->filepos = malloc(frames->num_frames * sizeof(off_t));
 108   frames->frame_size = malloc(frames->num_frames * sizeof(int));
 109
 110   // create a new video stream header
 111   sh_video = new_sh_video(demuxer, 0);
 112
 113   // make sure the demuxer knows about the new video stream header
 114   // (even though new_sh_video() ought to take care of it)
 115   demuxer->video->sh = sh_video;
 116
 117   // make sure that the video demuxer stream header knows about its
 118   // parent video demuxer stream (this is getting wacky), or else
 119   // video_read_properties() will choke
 120   sh_video->ds = demuxer->video;
 121
 122   // custom fourcc for internal MPlayer use
 123   sh_video->format = mmioFOURCC('F', 'L', 'I', 'C');
 124
 125   sh_video->disp_w = stream_read_word_le(demuxer->stream);
 126   sh_video->disp_h = stream_read_word_le(demuxer->stream);
 127
 128   // pass extradata to codec
 129   sh_video->bih = (BITMAPINFOHEADER*)header;
 130   sh_video->bih->biSize = sizeof(BITMAPINFOHEADER) + 128;
 131   sh_video->bih->biWidth = sh_video->disp_w;
 132   sh_video->bih->biHeight = sh_video->disp_h;
 133
 134   // skip the video depth and flags
 135   stream_skip(demuxer->stream, 4);
 136
 137   // get the speed
 138   speed = stream_read_word_le(demuxer->stream);
 139   if (speed == 0)
 140     speed = 1;
 141   if (magic_number == 0xAF11)
 142     speed *= 1000/70;
 143   sh_video->fps = 1000 / speed;
 144   sh_video->frametime = 1/sh_video->fps;
 145
 146   // build the frame index
 147   stream_seek(demuxer->stream, demuxer->movi_start);
 148   frame_number = 0;
 149   while ((!stream_eof(demuxer->stream)) && (frame_number < frames->num_frames))
 150   {
 151     frames->filepos[frame_number] = stream_tell(demuxer->stream);
 152     frame_size = stream_read_dword_le(demuxer->stream);
 153     magic_number = stream_read_word_le(demuxer->stream);
 154     stream_skip(demuxer->stream, frame_size - 6);
 155
 156     // if this chunk has the right magic number, index it
 157     if ((magic_number == 0xF1FA) || (magic_number == 0xF5FA))
 158     {
 159       frames->frame_size[frame_number] = frame_size;
 160       frame_number++;
 161     }
 162   }
 163
 164   // save the actual number of frames indexed
 165   frames->num_frames = frame_number;
 166
 167   demuxer->priv = frames;
 168
 169   return demuxer;
 170 }
 171
 172 static void demux_close_fli(demuxer_t* demuxer) {
 173   fli_frames_t *frames = demuxer->priv;
 174
 175   if(!frames)
 176     return;
 177
 178   if(frames->filepos)
 179     free(frames->filepos);
 180   if(frames->frame_size)
 181     free(frames->frame_size);
 182
 183   free(frames);
 184
 185 }
 186
 187
 188 static int fli_check_file(demuxer_t* demuxer)
 189 {
 190   int id;
 191
 192   stream_seek(demuxer->stream, 4);
 193   id=stream_read_word_le(demuxer->stream);
 194   // check for the FLI file magic number
 195   if((id==0xAF11) || (id==0xAF12))
 196     return DEMUXER_TYPE_FLI;
 197
 198   return 0;
 199 }
 200
 201
 202 const demuxer_desc_t demuxer_desc_fli = {
 203   "Autodesk FLIC demuxer",
 204   "fli",
 205   "FLI",
 206   "Mike Melanson",
 207   "Supports also some extensions",
 208   DEMUXER_TYPE_FLI,
 209   0, // unsafe autodetect (short signature)
 210   fli_check_file,
 211   demux_fli_fill_buffer,
 212   demux_open_fli,
 213   demux_close_fli,
 214   demux_seek_fli,
 215   NULL
 216 };