libmpdemux/demux_smjpeg.c

   1 /*
   2  * SMJPEG file parser
   3  * copyright (c) 2002 Alex Beregszaszi
   4  * based on text by Arpi (SMJPEG-format.txt) and later on
   5  * http://www.lokigames.com/development/download/smjpeg/SMJPEG.txt
   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 #include <string.h> /* strtok */
  28
  29 #include "config.h"
  30 #include "mp_msg.h"
  31 #include "libavutil/attributes.h"
  32 #include "stream/stream.h"
  33 #include "demuxer.h"
  34 #include "stheader.h"
  35
  36 static int smjpeg_check_file(demuxer_t* demuxer){
  37     int orig_pos = stream_tell(demuxer->stream);
  38     char buf[8];
  39     int version;
  40
  41     mp_msg(MSGT_DEMUX, MSGL_V, "Checking for SMJPEG\n");
  42
  43     if (stream_read_word(demuxer->stream) == 0xA)
  44     {
  45         stream_read(demuxer->stream, buf, 6);
  46         buf[7] = 0;
  47
  48         if (strncmp("SMJPEG", buf, 6)) {
  49             mp_msg(MSGT_DEMUX, MSGL_DBG2, "Failed: SMJPEG\n");
  50             return 0;
  51         }
  52     }
  53     else
  54         return 0;
  55
  56     version = stream_read_dword(demuxer->stream);
  57     if (version != 0)
  58     {
  59         mp_msg(MSGT_DEMUX, MSGL_ERR, "Unknown version (%d) of SMJPEG. Please report!\n",
  60             version);
  61         return 0;
  62     }
  63
  64     stream_seek(demuxer->stream, orig_pos);
  65
  66     return DEMUXER_TYPE_SMJPEG;
  67 }
  68
  69
  70 // return value:
  71 //     0 = EOF or no stream found
  72 //     1 = successfully read a packet
  73 static int demux_smjpeg_fill_buffer(demuxer_t *demux, demux_stream_t *ds)
  74 {
  75     int dtype, dsize, dpts;
  76
  77     demux->filepos = stream_tell(demux->stream);
  78
  79     dtype = stream_read_dword_le(demux->stream);
  80     dpts = stream_read_dword(demux->stream);
  81     dsize = stream_read_dword(demux->stream);
  82
  83     switch(dtype)
  84     {
  85         case mmioFOURCC('s','n','d','D'):
  86             /* fixme, but no decoder implemented yet */
  87             ds_read_packet(demux->audio, demux->stream, dsize,
  88                 (float)dpts/1000.0, demux->filepos, 0);
  89             break;
  90         case mmioFOURCC('v','i','d','D'):
  91             ds_read_packet(demux->video, demux->stream, dsize,
  92                 (float)dpts/1000.0, demux->filepos, 0);
  93             break;
  94         case mmioFOURCC('D','O','N','E'):
  95             return 1;
  96         default:
  97             return 0;
  98     }
  99
 100     return 1;
 101 }
 102
 103 static demuxer_t* demux_open_smjpeg(demuxer_t* demuxer){
 104     sh_video_t* sh_video;
 105     sh_audio_t* sh_audio;
 106     unsigned int htype = 0, hleng av_unused;
 107     int i = 0;
 108
 109     /* file header */
 110     stream_skip(demuxer->stream, 8); /* \x00\x0aSMJPEG */
 111     stream_skip(demuxer->stream, 4);
 112
 113     mp_msg(MSGT_DEMUX, MSGL_INFO, "This clip is %d seconds\n",
 114         stream_read_dword(demuxer->stream));
 115
 116     /* stream header */
 117     while (i < 3)
 118     {
 119         i++;
 120         htype = stream_read_dword_le(demuxer->stream);
 121         if (htype == mmioFOURCC('H','E','N','D'))
 122             break;
 123         hleng = (stream_read_word(demuxer->stream)<<16)|stream_read_word(demuxer->stream);
 124         switch(htype)
 125         {
 126         case mmioFOURCC('_','V','I','D'):
 127             sh_video = new_sh_video(demuxer, 0);
 128             demuxer->video->sh = sh_video;
 129             sh_video->ds = demuxer->video;
 130
 131             sh_video->bih = calloc(1, sizeof(*sh_video->bih));
 132
 133             stream_skip(demuxer->stream, 4); /* number of frames */
 134 //          sh_video->fps = 24;
 135 //          sh_video->frametime = 1.0f/sh_video->fps;
 136             sh_video->disp_w = stream_read_word(demuxer->stream);
 137             sh_video->disp_h = stream_read_word(demuxer->stream);
 138             sh_video->format = stream_read_dword_le(demuxer->stream);
 139
 140             /* these are false values */
 141             sh_video->bih->biSize = 40;
 142             sh_video->bih->biWidth = sh_video->disp_w;
 143             sh_video->bih->biHeight = sh_video->disp_h;
 144             sh_video->bih->biPlanes = 3;
 145             sh_video->bih->biBitCount = 12;
 146             sh_video->bih->biCompression = sh_video->format;
 147             sh_video->bih->biSizeImage = sh_video->disp_w*sh_video->disp_h;
 148             break;
 149         case mmioFOURCC('_','S','N','D'):
 150             sh_audio = new_sh_audio(demuxer, 0);
 151             demuxer->audio->id = 0;
 152             demuxer->audio->sh = sh_audio;
 153             sh_audio->ds = demuxer->audio;
 154
 155             sh_audio->wf = calloc(1, sizeof(*sh_audio->wf));
 156
 157             sh_audio->samplerate = stream_read_word(demuxer->stream);
 158             sh_audio->wf->wBitsPerSample = stream_read_char(demuxer->stream);
 159             sh_audio->channels = stream_read_char(demuxer->stream);
 160             sh_audio->format = stream_read_dword_le(demuxer->stream);
 161             sh_audio->wf->wFormatTag = sh_audio->format;
 162             sh_audio->wf->nChannels = sh_audio->channels;
 163             sh_audio->wf->nSamplesPerSec = sh_audio->samplerate;
 164             sh_audio->wf->nAvgBytesPerSec = sh_audio->wf->nChannels*
 165             sh_audio->wf->wBitsPerSample*sh_audio->wf->nSamplesPerSec/8;
 166             sh_audio->wf->nBlockAlign = sh_audio->channels *2;
 167             sh_audio->wf->cbSize = 0;
 168             break;
 169         case mmioFOURCC('_','T','X','T'):
 170             stream_skip(demuxer->stream, stream_read_dword(demuxer->stream));
 171             break;
 172         }
 173     }
 174
 175     demuxer->seekable = 0;
 176
 177     return demuxer;
 178 }
 179
 180 static void demux_close_smjpeg(demuxer_t *demuxer)
 181 {
 182     return;
 183 }
 184
 185
 186 const demuxer_desc_t demuxer_desc_smjpeg = {
 187   "smjpeg demuxer",
 188   "smjpeg",
 189   "SMJPEG",
 190   "Alex Beregszasi",
 191   "",
 192   DEMUXER_TYPE_SMJPEG,
 193   1, // safe autodetect
 194   smjpeg_check_file,
 195   demux_smjpeg_fill_buffer,
 196   demux_open_smjpeg,
 197   demux_close_smjpeg,
 198   NULL,
 199   NULL
 200 };