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/*
GIF file parser for MPlayer
by Joey Parrish
*/
#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"
#include <gif_lib.h>
static int current_pts = 0;
static unsigned char *pallete = NULL;
#define GIF_SIGNATURE (('G' << 16) | ('I' << 8) | 'F')
#ifndef HAVE_GIF_TVT_HACK
// not supported by certain versions of the library
int my_read_gif(GifFileType *gif, uint8_t *buf, int len) {
return stream_read(gif->UserData, buf, len);
}
#endif
static int gif_check_file(demuxer_t *demuxer)
{
if (stream_read_int24(demuxer->stream) == GIF_SIGNATURE)
return DEMUXER_TYPE_GIF;
return 0;
}
static int demux_gif_fill_buffer(demuxer_t *demuxer, demux_stream_t *ds)
{
GifFileType *gif = (GifFileType *)demuxer->priv;
GifRecordType type = UNDEFINED_RECORD_TYPE;
int len = 0;
demux_packet_t *dp = NULL;
ColorMapObject *effective_map = NULL;
char *buf = NULL;
while (type != IMAGE_DESC_RECORD_TYPE) {
if (DGifGetRecordType(gif, &type) == GIF_ERROR) {
PrintGifError();
return 0; // oops
}
if (type == TERMINATE_RECORD_TYPE)
return 0; // eof
if (type == SCREEN_DESC_RECORD_TYPE) {
if (DGifGetScreenDesc(gif) == GIF_ERROR) {
PrintGifError();
return 0; // oops
}
}
if (type == EXTENSION_RECORD_TYPE) {
int code;
unsigned char *p = NULL;
if (DGifGetExtension(gif, &code, &p) == GIF_ERROR) {
PrintGifError();
return 0; // oops
}
if (code == 0xF9) {
int frametime = 0;
if (p[0] == 4) // is the length correct?
frametime = (p[1] << 8) | p[2]; // set the time, centiseconds
current_pts += frametime;
} else if ((code == 0xFE) && (verbose)) { // comment extension
// print iff verbose
printf("GIF comment: ");
while (p != NULL) {
int length = p[0];
char *comments = p + 1;
comments[length] = 0;
printf("%s", comments);
if (DGifGetExtensionNext(gif, &p) == GIF_ERROR) {
PrintGifError();
return 0; // oops
}
}
printf("\n");
}
while (p != NULL) {
if (DGifGetExtensionNext(gif, &p) == GIF_ERROR) {
PrintGifError();
return 0; // oops
}
}
}
}
if (DGifGetImageDesc(gif) == GIF_ERROR) {
PrintGifError();
return 0; // oops
}
len = gif->Image.Width * gif->Image.Height;
dp = new_demux_packet(len);
buf = malloc(len);
memset(buf, 0, len);
memset(dp->buffer, 0, len);
if (DGifGetLine(gif, buf, len) == GIF_ERROR) {
PrintGifError();
return 0; // oops
}
effective_map = gif->Image.ColorMap;
if (effective_map == NULL) effective_map = gif->SColorMap;
{
int y;
// copy the pallete
for (y = 0; y < 256; y++) {
pallete[(y * 4) + 0] = effective_map->Colors[y].Blue;
pallete[(y * 4) + 1] = effective_map->Colors[y].Green;
pallete[(y * 4) + 2] = effective_map->Colors[y].Red;
pallete[(y * 4) + 3] = 0;
}
for (y = 0; y < gif->Image.Height; y++) {
unsigned char *drow = dp->buffer;
unsigned char *gbuf = buf + (y * gif->Image.Width);
drow += gif->Image.Width * (y + gif->Image.Top);
drow += gif->Image.Left;
memcpy(drow, gbuf, gif->Image.Width);
}
}
free(buf);
demuxer->video->dpos++;
dp->pts = ((float)current_pts) / 100;
dp->pos = stream_tell(demuxer->stream);
ds_add_packet(demuxer->video, dp);
return 1;
}
static demuxer_t* demux_open_gif(demuxer_t* demuxer)
{
sh_video_t *sh_video = NULL;
GifFileType *gif = NULL;
current_pts = 0;
demuxer->seekable = 0; // FIXME
// go back to the beginning
stream_seek(demuxer->stream,demuxer->stream->start_pos);
#ifdef HAVE_GIF_TVT_HACK
// without the TVT functionality of libungif, a hard seek must be
// done to the beginning of the file. this is because libgif is
// unable to use mplayer's cache, and without this lseek libgif will
// not read from the beginning of the file and the command will fail.
// with this hack enabled, you will lose the ability to stream a GIF.
lseek(demuxer->stream->fd, 0, SEEK_SET);
gif = DGifOpenFileHandle(demuxer->stream->fd);
#else
gif = DGifOpen(demuxer->stream, my_read_gif);
#endif
if (!gif) {
PrintGifError();
return NULL;
}
// create a new video stream header
sh_video = new_sh_video(demuxer, 0);
// make sure the demuxer knows about the new video stream header
// (even though new_sh_video() ought to take care of it)
demuxer->video->sh = sh_video;
// make sure that the video demuxer stream header knows about its
// parent video demuxer stream (this is getting wacky), or else
// video_read_properties() will choke
sh_video->ds = demuxer->video;
sh_video->disp_w = gif->SWidth;
sh_video->disp_h = gif->SHeight;
sh_video->format = mmioFOURCC(8, 'R', 'G', 'B');
sh_video->fps = 5.0f;
sh_video->frametime = 1.0f / sh_video->fps;
sh_video->bih = malloc(sizeof(BITMAPINFOHEADER) + (256 * 4));
sh_video->bih->biCompression = sh_video->format;
sh_video->bih->biBitCount = 8;
sh_video->bih->biPlanes = 2;
pallete = (unsigned char *)(sh_video->bih + 1);
demuxer->priv = gif;
return demuxer;
}
static void demux_close_gif(demuxer_t* demuxer)
{
GifFileType *gif = (GifFileType *)demuxer->priv;
if(!gif)
return;
if (DGifCloseFile(gif) == GIF_ERROR)
PrintGifError();
demuxer->stream->fd = 0;
demuxer->priv = NULL;
}
demuxer_desc_t demuxer_desc_gif = {
"GIF demuxer",
"gif",
"GIF",
"Joey Parrish",
"",
DEMUXER_TYPE_GIF,
0, // unsafe autodetect
gif_check_file,
demux_gif_fill_buffer,
demux_open_gif,
demux_close_gif,
NULL,
NULL
};
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