mirror of
https://github.com/mpv-player/mpv
synced 2024-12-11 17:37:23 +00:00
4919658621
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@10038 b3059339-0415-0410-9bf9-f77b7e298cf2
117 lines
3.3 KiB
C
117 lines
3.3 KiB
C
/*
|
|
BMP file parser for the MPlayer program
|
|
by Mike Melanson
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
#include "config.h"
|
|
#include "mp_msg.h"
|
|
#include "help_mp.h"
|
|
|
|
#include "stream.h"
|
|
#include "demuxer.h"
|
|
#include "stheader.h"
|
|
|
|
typedef struct {
|
|
int image_size;
|
|
int image_offset;
|
|
} bmp_image_t;
|
|
|
|
// Check if a file is a BMP file depending on whether starts with 'BM'
|
|
int bmp_check_file(demuxer_t *demuxer)
|
|
{
|
|
if (stream_read_word(demuxer->stream) == (('B' << 8) | 'M'))
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
// return value:
|
|
// 0 = EOF or no stream found
|
|
// 1 = successfully read a packet
|
|
int demux_bmp_fill_buffer(demuxer_t *demuxer)
|
|
{
|
|
bmp_image_t *bmp_image = (bmp_image_t *)demuxer->priv;
|
|
|
|
stream_reset(demuxer->stream);
|
|
stream_seek(demuxer->stream, bmp_image->image_offset);
|
|
ds_read_packet(demuxer->video, demuxer->stream, bmp_image->image_size,
|
|
0, bmp_image->image_offset, 1);
|
|
|
|
return 1;
|
|
}
|
|
|
|
demuxer_t* demux_open_bmp(demuxer_t* demuxer)
|
|
{
|
|
sh_video_t *sh_video = NULL;
|
|
unsigned int filesize;
|
|
unsigned int data_offset;
|
|
bmp_image_t *bmp_image;
|
|
|
|
// go back to the beginning
|
|
stream_reset(demuxer->stream);
|
|
stream_seek(demuxer->stream, 2);
|
|
filesize = stream_read_dword_le(demuxer->stream);
|
|
stream_skip(demuxer->stream, 4);
|
|
data_offset = stream_read_word_le(demuxer->stream);
|
|
stream_skip(demuxer->stream, 2);
|
|
|
|
// create a new video stream header
|
|
sh_video = new_sh_video(demuxer, 0);
|
|
|
|
// make sure the demuxer knows about the new video stream header
|
|
demuxer->video->sh = sh_video;
|
|
|
|
// make sure that the video demuxer stream header knows about its
|
|
// parent video demuxer stream
|
|
sh_video->ds = demuxer->video;
|
|
|
|
// load the BITMAPINFOHEADER
|
|
// allocate size and take the palette table into account
|
|
sh_video->bih = (BITMAPINFOHEADER *)malloc(data_offset - 12);
|
|
sh_video->bih->biSize = stream_read_dword_le(demuxer->stream);
|
|
sh_video->bih->biWidth = stream_read_dword_le(demuxer->stream);
|
|
sh_video->bih->biHeight = stream_read_dword_le(demuxer->stream);
|
|
sh_video->bih->biPlanes = stream_read_word_le(demuxer->stream);
|
|
sh_video->bih->biBitCount = stream_read_word_le(demuxer->stream);
|
|
sh_video->bih->biCompression = stream_read_dword_le(demuxer->stream);
|
|
sh_video->bih->biSizeImage = stream_read_dword_le(demuxer->stream);
|
|
sh_video->bih->biXPelsPerMeter = stream_read_dword_le(demuxer->stream);
|
|
sh_video->bih->biYPelsPerMeter = stream_read_dword_le(demuxer->stream);
|
|
sh_video->bih->biClrUsed = stream_read_dword_le(demuxer->stream);
|
|
sh_video->bih->biClrImportant = stream_read_dword_le(demuxer->stream);
|
|
// fetch the palette
|
|
stream_read(demuxer->stream, (unsigned char *)(sh_video->bih) + 40,
|
|
sh_video->bih->biClrUsed * 4);
|
|
|
|
// load the data
|
|
bmp_image = (bmp_image_t *)malloc(sizeof(bmp_image_t));
|
|
bmp_image->image_size = filesize - data_offset;
|
|
bmp_image->image_offset = data_offset;
|
|
|
|
// custom fourcc for internal MPlayer use
|
|
sh_video->format = sh_video->bih->biCompression;
|
|
|
|
sh_video->disp_w = sh_video->bih->biWidth;
|
|
sh_video->disp_h = sh_video->bih->biHeight;
|
|
|
|
// get the speed
|
|
sh_video->fps = 2;
|
|
sh_video->frametime = 1 / sh_video->fps;
|
|
|
|
demuxer->priv = bmp_image;
|
|
|
|
return demuxer;
|
|
}
|
|
|
|
void demux_close_bmp(demuxer_t* demuxer) {
|
|
bmp_image_t *bmp_image = demuxer->priv;
|
|
|
|
if(!bmp_image)
|
|
return;
|
|
free(bmp_image);
|
|
}
|