mirror of https://github.com/mpv-player/mpv
379 lines
10 KiB
C
379 lines
10 KiB
C
/*
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MPlayer video driver for animated gif output
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(C) 2002
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Written by Joey Parrish <joey@nicewarrior.org>
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Based on vo_directfb2.c
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301 USA.
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*/
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/* Notes:
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* when setting output framerate, frames will be ignored as needed
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* to achieve the desired rate. no frames will be duplicated.
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*
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* output framerate can be specified as a float
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* value now, instead of just an int.
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*
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* adjustments will be made to both the frame drop cycle and the
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* delay per frame to achieve the desired output framerate.
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*
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* time values are in centiseconds, because that's
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* what the gif spec uses for it's delay values.
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*
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* preinit looks for arguments in one of the following formats (in this order):
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* fps:filename -- sets the framerate (float) and output file
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* fps -- sets the framerate (float), default file out.gif
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* filename -- defaults to 5 fps, sets output file
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* (none) -- defaults to 5 fps, output file out.gif
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*
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* trying to put the filename before the framerate will result in the
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* entire argument being interpretted as the filename.
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*/
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#include <gif_lib.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "config.h"
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#include "subopt-helper.h"
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#include "video_out.h"
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#include "video_out_internal.h"
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#include "mp_msg.h"
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#define MPLAYER_VERSION 0.90
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#define VO_GIF_REVISION 6
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static const vo_info_t info = {
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"animated GIF output",
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"gif89a",
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"Joey Parrish joey@nicewarrior.org",
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""
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};
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const LIBVO_EXTERN(gif89a)
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// how many frames per second we are aiming for during output.
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static float target_fps;
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// default value for output fps.
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static const float default_fps = 5.00;
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// the ideal gif delay per frame.
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static float ideal_delay;
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// the ideal time thus far.
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static float ideal_time;
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// actual time thus far.
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static int real_time;
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// nominal framedrop cycle length in frames
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static float frame_cycle;
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// position in the framedrop cycle
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static int cycle_pos;
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// adjustment of the framedrop cycle
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static float frame_adj;
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// the output width and height
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static uint32_t img_width;
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static uint32_t img_height;
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// image data for slice rendering
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static uint8_t *slice_data = NULL;
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// reduced image data for flip_page
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static uint8_t *reduce_data = NULL;
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// reduced color map for flip_page
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static ColorMapObject *reduce_cmap = NULL;
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// a pointer to the gif structure
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static GifFileType *new_gif = NULL;
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// a string to contain the filename of the output gif
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static char *gif_filename = NULL;
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// the default output filename
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#define DEFAULT_FILE "out.gif"
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static opt_t subopts[] = {
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{"output", OPT_ARG_MSTRZ, &gif_filename, NULL, 0},
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{"fps", OPT_ARG_FLOAT, &target_fps, NULL, 0},
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{NULL, 0, NULL, NULL, 0}
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};
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static int preinit(const char *arg)
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{
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target_fps = 0;
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if (subopt_parse(arg, subopts) != 0) {
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mp_msg(MSGT_VO, MSGL_FATAL,
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"\n-vo gif89a command line help:\n"
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"Example: mplayer -vo gif89a:output=file.gif:fps=4.9\n"
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"\nOptions:\n"
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" output=<filename>\n"
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" Specify the output file. The default is out.gif.\n"
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" fps=<rate>\n"
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" Specify the target framerate. The default is 5.0.\n"
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"\n");
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return -1;
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}
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if (target_fps > vo_fps)
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target_fps = vo_fps; // i will not duplicate frames.
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if (target_fps <= 0) {
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target_fps = default_fps;
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mp_msg(MSGT_VO, MSGL_V, "GIF89a: default, %.2f fps\n", target_fps);
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} else {
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mp_msg(MSGT_VO, MSGL_V, "GIF89a: output fps forced to %.2f\n", target_fps);
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}
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ideal_delay = 100 / target_fps; // in centiseconds
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frame_cycle = vo_fps / target_fps;
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// we make one output frame every (frame_cycle) frames, on average.
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if (gif_filename == NULL) {
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gif_filename = strdup(DEFAULT_FILE);
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mp_msg(MSGT_VO, MSGL_V, "GIF89a: default, file \"%s\"\n", gif_filename);
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} else {
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mp_msg(MSGT_VO, MSGL_V, "GIF89a: file forced to \"%s\"\n", gif_filename);
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}
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mp_msg(MSGT_VO, MSGL_DBG2, "GIF89a: Preinit OK\n");
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return 0;
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}
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static int config(uint32_t s_width, uint32_t s_height, uint32_t d_width,
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uint32_t d_height, uint32_t flags, char *title,
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uint32_t format)
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{
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#ifdef CONFIG_GIF_4
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// these are control blocks for the gif looping extension.
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char LB1[] = "NETSCAPE2.0";
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char LB2[] = { 1, 0, 0 };
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#endif
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mp_msg(MSGT_VO, MSGL_DBG2, "GIF89a: Config entered [%dx%d]\n", s_width,s_height);
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mp_msg(MSGT_VO, MSGL_DBG2, "GIF89a: With requested format: %s\n", vo_format_name(format));
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// save these for later.
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img_width = s_width;
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img_height = s_height;
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// multiple configs without uninit are not allowed.
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// this is because config opens a new gif file.
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if (vo_config_count > 0) {
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mp_msg(MSGT_VO, MSGL_V, "GIF89a: Reconfigure attempted.\n");
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return 0;
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}
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// reconfigure need not be a fatal error, so return 0.
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// multiple configs without uninit will result in two
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// movies concatenated in one gif file. the output
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// gif will have the dimensions of the first movie.
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if (format != IMGFMT_RGB24) {
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mp_msg(MSGT_VO, MSGL_ERR, "GIF89a: Error - given unsupported colorspace.\n");
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return 1;
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}
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// the EGifSetGifVersion line causes segfaults in certain
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// earlier versions of libungif. i don't know exactly which,
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// but certainly in all those before v4. if you have problems,
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// you need to upgrade your gif library.
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#ifdef CONFIG_GIF_4
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EGifSetGifVersion("89a");
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#else
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mp_msg(MSGT_VO, MSGL_ERR, "GIF89a: Your version of libungif needs to be upgraded.\n");
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mp_msg(MSGT_VO, MSGL_ERR, "GIF89a: Some functionality has been disabled.\n");
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#endif
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new_gif = EGifOpenFileName(gif_filename, 0);
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if (new_gif == NULL) {
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mp_msg(MSGT_VO, MSGL_ERR, "GIF89a: error opening file \"%s\" for output.\n", gif_filename);
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return 1;
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}
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slice_data = malloc(img_width * img_height * 3);
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if (slice_data == NULL) {
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mp_msg(MSGT_VO, MSGL_ERR, "GIF89a: malloc failed.\n");
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return 1;
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}
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reduce_data = malloc(img_width * img_height);
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if (reduce_data == NULL) {
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free(slice_data); slice_data = NULL;
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mp_msg(MSGT_VO, MSGL_ERR, "GIF89a: malloc failed.\n");
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return 1;
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}
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reduce_cmap = MakeMapObject(256, NULL);
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if (reduce_cmap == NULL) {
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free(slice_data); slice_data = NULL;
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free(reduce_data); reduce_data = NULL;
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mp_msg(MSGT_VO, MSGL_ERR, "GIF89a: malloc failed.\n");
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return 1;
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}
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// initialize the delay and framedrop variables.
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ideal_time = 0;
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real_time = 0;
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cycle_pos = 0;
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frame_adj = 0;
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// set the initial width and height info.
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EGifPutScreenDesc(new_gif, s_width, s_height, 256, 0, reduce_cmap);
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#ifdef CONFIG_GIF_4
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// version 3 of libungif does not support multiple control blocks.
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// looping requires multiple control blocks.
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// therefore, looping is only enabled for v4 and up.
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EGifPutExtensionFirst(new_gif, 0xFF, 11, LB1);
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EGifPutExtensionLast(new_gif, 0, 3, LB2);
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#endif
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mp_msg(MSGT_VO, MSGL_DBG2, "GIF89a: Config finished.\n");
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return 0;
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}
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// we do not draw osd.
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void draw_osd() {}
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// we do not handle events.
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static void check_events(void) {}
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static int gif_reduce(int width, int height, uint8_t *src, uint8_t *dst, GifColorType *colors)
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{
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unsigned char Ra[width * height];
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unsigned char Ga[width * height];
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unsigned char Ba[width * height];
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unsigned char *R, *G, *B;
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int size = 256;
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int i;
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R = Ra; G = Ga; B = Ba;
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for (i = 0; i < width * height; i++)
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{
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*R++ = *src++;
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*G++ = *src++;
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*B++ = *src++;
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}
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R = Ra; G = Ga; B = Ba;
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return QuantizeBuffer(width, height, &size, R, G, B, dst, colors);
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}
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static void flip_page(void)
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{
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char CB[4]; // control block
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int delay = 0;
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int ret;
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cycle_pos++;
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if (cycle_pos < frame_cycle - frame_adj)
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return; // we are skipping this frame
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// quantize the image
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ret = gif_reduce(img_width, img_height, slice_data, reduce_data, reduce_cmap->Colors);
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if (ret == GIF_ERROR) {
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mp_msg(MSGT_VO, MSGL_ERR, "GIF89a: Quantize failed.\n");
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return;
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}
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// calculate frame delays and frame skipping
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ideal_time += ideal_delay;
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delay = (int)(ideal_time - real_time);
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real_time += delay;
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frame_adj += cycle_pos;
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frame_adj -= frame_cycle;
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cycle_pos = 0;
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// set up the delay control block
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CB[0] = (char)(delay >> 8);
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CB[1] = (char)(delay & 0xff);
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CB[2] = 0;
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CB[3] = 0;
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// put the control block with delay info
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EGifPutExtension(new_gif, 0xF9, 0x04, CB);
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// put the image description
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EGifPutImageDesc(new_gif, 0, 0, img_width, img_height, 0, reduce_cmap);
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// put the image itself
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EGifPutLine(new_gif, reduce_data, img_width * img_height);
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}
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static int draw_frame(uint8_t *src[])
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{
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return 1;
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}
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static int draw_slice(uint8_t *src[], int stride[], int w, int h, int x, int y)
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{
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uint8_t *dst, *frm;
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int i;
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dst = slice_data + (img_width * y + x) * 3;
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frm = src[0];
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for (i = 0; i < h; i++) {
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memcpy(dst, frm, w * 3);
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dst += (img_width * 3);
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frm += stride[0];
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}
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return 0;
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}
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static int query_format(uint32_t format)
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{
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if (format == IMGFMT_RGB24)
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return VFCAP_CSP_SUPPORTED | VFCAP_CSP_SUPPORTED_BY_HW | VFCAP_TIMER | VFCAP_ACCEPT_STRIDE;
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return 0;
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}
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static int control(uint32_t request, void *data, ...)
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{
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if (request == VOCTRL_QUERY_FORMAT) {
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return query_format(*((uint32_t*)data));
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}
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if (request == VOCTRL_DUPLICATE_FRAME) {
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flip_page();
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return VO_TRUE;
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}
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return VO_NOTIMPL;
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}
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static void uninit(void)
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{
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mp_msg(MSGT_VO, MSGL_DBG2, "GIF89a: Uninit entered\n");
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if (new_gif != NULL) {
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char temp[256];
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// comment the gif and close it
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snprintf(temp, 256, "MPlayer gif output v%2.2f-%d (c) %s\r\n",
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MPLAYER_VERSION, VO_GIF_REVISION,
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"joey@nicewarrior.org");
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EGifPutComment(new_gif, temp);
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EGifCloseFile(new_gif); // also frees gif storage space.
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}
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// free our allocated ram
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if (gif_filename != NULL) free(gif_filename);
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if (slice_data != NULL) free(slice_data);
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if (reduce_data != NULL) free(reduce_data);
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if (reduce_cmap != NULL) FreeMapObject(reduce_cmap);
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// set the pointers back to null.
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new_gif = NULL;
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gif_filename = NULL;
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slice_data = NULL;
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reduce_data = NULL;
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reduce_cmap = NULL;
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}
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