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/*
SMJPEG file parser by Alex Beregszaszi
Only for testing some files.
Commited only for Nexus' request.
Based on text by Arpi (SMJPEG-format.txt) and later on
http://www.lokigames.com/development/download/smjpeg/SMJPEG.txt
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h> /* strtok */
#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"
#include "stream/stream.h"
#include "demuxer.h"
#include "stheader.h"
static int smjpeg_check_file(demuxer_t* demuxer){
int orig_pos = stream_tell(demuxer->stream);
char buf[8];
int version;
mp_msg(MSGT_DEMUX, MSGL_V, "Checking for SMJPEG\n");
if (stream_read_word(demuxer->stream) == 0xA)
{
stream_read(demuxer->stream, buf, 6);
buf[7] = 0;
if (strncmp("SMJPEG", buf, 6)) {
mp_msg(MSGT_DEMUX, MSGL_DBG2, "Failed: SMJPEG\n");
return 0;
}
}
else
return 0;
version = stream_read_dword(demuxer->stream);
if (version != 0)
{
mp_msg(MSGT_DEMUX, MSGL_ERR, "Unknown version (%d) of SMJPEG. Please report!\n",
version);
return 0;
}
stream_seek(demuxer->stream, orig_pos);
return DEMUXER_TYPE_SMJPEG;
}
// return value:
// 0 = EOF or no stream found
// 1 = successfully read a packet
static int demux_smjpeg_fill_buffer(demuxer_t *demux, demux_stream_t *ds)
{
int dtype, dsize, dpts;
demux->filepos = stream_tell(demux->stream);
dtype = stream_read_dword_le(demux->stream);
dpts = stream_read_dword(demux->stream);
dsize = stream_read_dword(demux->stream);
switch(dtype)
{
case mmioFOURCC('s','n','d','D'):
/* fixme, but no decoder implemented yet */
ds_read_packet(demux->audio, demux->stream, dsize,
(float)dpts/1000.0, demux->filepos, 0);
break;
case mmioFOURCC('v','i','d','D'):
ds_read_packet(demux->video, demux->stream, dsize,
(float)dpts/1000.0, demux->filepos, 0);
break;
case mmioFOURCC('D','O','N','E'):
return 1;
default:
return 0;
}
return 1;
}
static demuxer_t* demux_open_smjpeg(demuxer_t* demuxer){
sh_video_t* sh_video;
sh_audio_t* sh_audio;
unsigned int htype = 0, hleng;
int i = 0;
/* file header */
stream_skip(demuxer->stream, 8); /* \x00\x0aSMJPEG */
stream_skip(demuxer->stream, 4);
mp_msg(MSGT_DEMUX, MSGL_INFO, "This clip is %d seconds\n",
stream_read_dword(demuxer->stream));
/* stream header */
while (i < 3)
{
i++;
htype = stream_read_dword_le(demuxer->stream);
if (htype == mmioFOURCC('H','E','N','D'))
break;
hleng = (stream_read_word(demuxer->stream)<<16)|stream_read_word(demuxer->stream);
switch(htype)
{
case mmioFOURCC('_','V','I','D'):
sh_video = new_sh_video(demuxer, 0);
demuxer->video->sh = sh_video;
sh_video->ds = demuxer->video;
sh_video->bih = malloc(sizeof(BITMAPINFOHEADER));
memset(sh_video->bih, 0, sizeof(BITMAPINFOHEADER));
stream_skip(demuxer->stream, 4); /* number of frames */
// sh_video->fps = 24;
// sh_video->frametime = 1.0f/sh_video->fps;
sh_video->disp_w = stream_read_word(demuxer->stream);
sh_video->disp_h = stream_read_word(demuxer->stream);
sh_video->format = stream_read_dword_le(demuxer->stream);
/* these are false values */
sh_video->bih->biSize = 40;
sh_video->bih->biWidth = sh_video->disp_w;
sh_video->bih->biHeight = sh_video->disp_h;
sh_video->bih->biPlanes = 3;
sh_video->bih->biBitCount = 12;
sh_video->bih->biCompression = sh_video->format;
sh_video->bih->biSizeImage = sh_video->disp_w*sh_video->disp_h;
break;
case mmioFOURCC('_','S','N','D'):
sh_audio = new_sh_audio(demuxer, 0);
demuxer->audio->id = 0;
demuxer->audio->sh = sh_audio;
sh_audio->ds = demuxer->audio;
sh_audio->wf = malloc(sizeof(WAVEFORMATEX));
memset(sh_audio->wf, 0, sizeof(WAVEFORMATEX));
sh_audio->samplerate = stream_read_word(demuxer->stream);
sh_audio->wf->wBitsPerSample = stream_read_char(demuxer->stream);
sh_audio->channels = stream_read_char(demuxer->stream);
sh_audio->format = stream_read_dword_le(demuxer->stream);
sh_audio->wf->wFormatTag = sh_audio->format;
sh_audio->wf->nChannels = sh_audio->channels;
sh_audio->wf->nSamplesPerSec = sh_audio->samplerate;
sh_audio->wf->nAvgBytesPerSec = sh_audio->wf->nChannels*
sh_audio->wf->wBitsPerSample*sh_audio->wf->nSamplesPerSec/8;
sh_audio->wf->nBlockAlign = sh_audio->channels *2;
sh_audio->wf->cbSize = 0;
break;
case mmioFOURCC('_','T','X','T'):
stream_skip(demuxer->stream, stream_read_dword(demuxer->stream));
break;
}
}
demuxer->seekable = 0;
return demuxer;
}
static void demux_close_smjpeg(demuxer_t *demuxer)
{
return;
}
const demuxer_desc_t demuxer_desc_smjpeg = {
"smjpeg demuxer",
"smjpeg",
"SMJPEG",
"Alex Beregszasi",
"",
DEMUXER_TYPE_SMJPEG,
1, // safe autodetect
smjpeg_check_file,
demux_smjpeg_fill_buffer,
demux_open_smjpeg,
demux_close_smjpeg,
NULL,
NULL
};
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