mirror of
https://github.com/mpv-player/mpv
synced 2024-12-10 00:46:22 +00:00
33154a7188
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@9464 b3059339-0415-0410-9bf9-f77b7e298cf2
223 lines
5.5 KiB
C
223 lines
5.5 KiB
C
/*
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GIF file parser for MPlayer
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by Joey Parrish
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "config.h"
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#ifdef HAVE_GIF
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#include "mp_msg.h"
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#include "help_mp.h"
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#include "stream.h"
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#include "demuxer.h"
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#include "stheader.h"
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#include <gif_lib.h>
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static int current_pts = 0;
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static unsigned char *pallete = NULL;
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#define GIF_SIGNATURE (('G' << 16) | ('I' << 8) | 'F')
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#ifndef HAVE_GIF_TVT_HACK
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// not supported by certain versions of the library
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int my_read_gif(GifFileType *gif, uint8_t *buf, int len) {
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return stream_read(gif->UserData, buf, len);
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}
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#endif
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int gif_check_file(demuxer_t *demuxer)
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{
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if (stream_read_int24(demuxer->stream) == GIF_SIGNATURE)
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return 1;
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return 0;
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}
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int demux_gif_fill_buffer(demuxer_t *demuxer)
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{
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GifFileType *gif = (GifFileType *)demuxer->priv;
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sh_video_t *sh_video = (sh_video_t *)demuxer->video->sh;
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GifRecordType type = UNDEFINED_RECORD_TYPE;
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int len = 0;
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demux_packet_t *dp = NULL;
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ColorMapObject *effective_map = NULL;
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char *buf = NULL;
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while (type != IMAGE_DESC_RECORD_TYPE) {
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if (DGifGetRecordType(gif, &type) == GIF_ERROR) {
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PrintGifError();
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return 0; // oops
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}
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if (type == TERMINATE_RECORD_TYPE)
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return 0; // eof
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if (type == SCREEN_DESC_RECORD_TYPE) {
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if (DGifGetScreenDesc(gif) == GIF_ERROR) {
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PrintGifError();
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return 0; // oops
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}
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}
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if (type == EXTENSION_RECORD_TYPE) {
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int code;
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unsigned char *p = NULL;
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if (DGifGetExtension(gif, &code, &p) == GIF_ERROR) {
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PrintGifError();
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return 0; // oops
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}
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if (code == 0xF9) {
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int frametime = 0;
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if (p[0] == 4) // is the length correct?
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frametime = (p[1] << 8) | p[2]; // set the time, centiseconds
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current_pts += frametime;
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} else if ((code == 0xFE) && (verbose)) { // comment extension
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// print iff verbose
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printf("GIF comment: ");
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while (p != NULL) {
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int length = p[0];
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char *comments = p + 1;
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comments[length] = 0;
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printf("%s", comments);
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if (DGifGetExtensionNext(gif, &p) == GIF_ERROR) {
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PrintGifError();
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return 0; // oops
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}
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}
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printf("\n");
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}
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while (p != NULL) {
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if (DGifGetExtensionNext(gif, &p) == GIF_ERROR) {
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PrintGifError();
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return 0; // oops
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}
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}
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}
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}
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if (DGifGetImageDesc(gif) == GIF_ERROR) {
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PrintGifError();
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return 0; // oops
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}
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len = gif->Image.Width * gif->Image.Height;
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dp = new_demux_packet(len);
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buf = malloc(len);
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memset(buf, 0, len);
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memset(dp->buffer, 0, len);
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if (DGifGetLine(gif, buf, len) == GIF_ERROR) {
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PrintGifError();
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return 0; // oops
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}
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effective_map = gif->Image.ColorMap;
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if (effective_map == NULL) effective_map = gif->SColorMap;
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{
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int y;
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// copy the pallete
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for (y = 0; y < 256; y++) {
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pallete[(y * 4) + 0] = effective_map->Colors[y].Blue;
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pallete[(y * 4) + 1] = effective_map->Colors[y].Green;
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pallete[(y * 4) + 2] = effective_map->Colors[y].Red;
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pallete[(y * 4) + 3] = 0;
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}
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for (y = 0; y < gif->Image.Height; y++) {
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unsigned char *drow = dp->buffer;
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unsigned char *gbuf = buf + (y * gif->Image.Width);
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drow += gif->Image.Width * (y + gif->Image.Top);
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drow += gif->Image.Left;
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memcpy(drow, gbuf, gif->Image.Width);
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}
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}
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free(buf);
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demuxer->video->dpos++;
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dp->pts = ((float)current_pts) / 100;
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dp->pos = stream_tell(demuxer->stream);
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ds_add_packet(demuxer->video, dp);
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return 1;
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}
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demuxer_t* demux_open_gif(demuxer_t* demuxer)
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{
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sh_video_t *sh_video = NULL;
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GifFileType *gif = NULL;
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current_pts = 0;
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demuxer->seekable = 0; // FIXME
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// go back to the beginning
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stream_seek(demuxer->stream,demuxer->stream->start_pos);
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#ifdef HAVE_GIF_TVT_HACK
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// without the TVT functionality of libungif, a hard seek must be
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// done to the beginning of the file. this is because libgif is
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// unable to use mplayer's cache, and without this lseek libgif will
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// not read from the beginning of the file and the command will fail.
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// with this hack enabled, you will lose the ability to stream a GIF.
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lseek(demuxer->stream->fd, 0, SEEK_SET);
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gif = DGifOpenFileHandle(demuxer->stream->fd);
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#else
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gif = DGifOpen(demuxer->stream, my_read_gif);
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#endif
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if (!gif) {
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PrintGifError();
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return NULL;
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}
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// create a new video stream header
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sh_video = new_sh_video(demuxer, 0);
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// make sure the demuxer knows about the new video stream header
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// (even though new_sh_video() ought to take care of it)
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demuxer->video->sh = sh_video;
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// make sure that the video demuxer stream header knows about its
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// parent video demuxer stream (this is getting wacky), or else
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// video_read_properties() will choke
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sh_video->ds = demuxer->video;
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sh_video->disp_w = gif->SWidth;
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sh_video->disp_h = gif->SHeight;
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sh_video->format = mmioFOURCC(8, 'R', 'G', 'B');
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sh_video->fps = 5.0f;
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sh_video->frametime = 1.0f / sh_video->fps;
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sh_video->bih = malloc(sizeof(BITMAPINFOHEADER) + (256 * 4));
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sh_video->bih->biCompression = sh_video->format;
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sh_video->bih->biBitCount = 8;
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sh_video->bih->biPlanes = 2;
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pallete = (unsigned char *)(sh_video->bih + 1);
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demuxer->priv = gif;
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return demuxer;
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}
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void demux_close_gif(demuxer_t* demuxer)
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{
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GifFileType *gif = (GifFileType *)demuxer->priv;
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if(!gif)
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return;
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if (DGifCloseFile(gif) == GIF_ERROR)
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PrintGifError();
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demuxer->stream->fd = 0;
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demuxer->priv = NULL;
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}
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#endif /* HAVE_GIF */
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