2002-04-08 14:32:01 +02:00
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/*
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2006-10-23 10:57:54 +02:00
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* Animated GIF muxer
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2009-01-19 16:46:40 +01:00
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* Copyright (c) 2000 Fabrice Bellard
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2002-04-08 14:32:01 +02:00
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*
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2013-04-10 19:26:49 +02:00
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* first version by Francois Revol <revol@free.fr>
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*
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2006-10-07 17:30:46 +02:00
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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2002-05-26 00:34:32 +02:00
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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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2006-10-07 17:30:46 +02:00
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* version 2.1 of the License, or (at your option) any later version.
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2002-04-08 14:32:01 +02:00
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*
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2006-10-07 17:30:46 +02:00
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* FFmpeg is distributed in the hope that it will be useful,
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2002-04-08 14:32:01 +02:00
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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2002-05-26 00:34:32 +02:00
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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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2002-04-08 14:32:01 +02:00
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*
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2002-05-26 00:34:32 +02:00
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* You should have received a copy of the GNU Lesser General Public
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2006-10-07 17:30:46 +02:00
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* License along with FFmpeg; if not, write to the Free Software
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2006-01-12 23:43:26 +01:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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2002-04-08 14:32:01 +02:00
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*/
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#include "avformat.h"
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2013-04-17 04:20:48 +02:00
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#include "libavutil/avassert.h"
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#include "libavutil/imgutils.h"
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2011-06-18 09:47:46 +02:00
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#include "libavutil/log.h"
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#include "libavutil/opt.h"
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2009-01-14 01:27:43 +01:00
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2005-06-18 03:52:24 +02:00
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/* slows down the decoding (and some browsers don't like it) */
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2012-02-19 19:24:45 +01:00
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/* update on the 'some browsers don't like it issue from above:
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* this was probably due to missing 'Data Sub-block Terminator'
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* (byte 19) in the app_header */
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2005-06-18 03:52:24 +02:00
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#define GIF_ADD_APP_HEADER // required to enable looping of animated gif
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2002-04-08 14:32:01 +02:00
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2012-02-19 19:24:45 +01:00
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static int gif_image_write_header(AVIOContext *pb, int width, int height,
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int loop_count, uint32_t *palette)
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2002-04-08 14:32:01 +02:00
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{
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2003-02-03 23:52:38 +01:00
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int i;
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2002-04-08 14:32:01 +02:00
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2011-02-24 07:36:04 +01:00
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avio_write(pb, "GIF", 3);
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avio_write(pb, "89a", 3);
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2011-02-21 19:28:17 +01:00
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avio_wl16(pb, width);
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avio_wl16(pb, height);
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2002-04-08 14:32:01 +02:00
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2013-04-17 04:20:48 +02:00
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if (palette) {
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2013-04-18 00:12:30 +02:00
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avio_w8(pb, 0xf7); /* flags: global clut, 256 entries */
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avio_w8(pb, 0x1f); /* background color index */
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avio_w8(pb, 0); /* aspect ratio */
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2012-02-19 19:24:45 +01:00
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for (i = 0; i < 256; i++) {
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2013-04-18 01:13:17 +02:00
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const uint32_t v = palette[i] & 0xffffff;
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2013-04-18 00:17:58 +02:00
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avio_wb24(pb, v);
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2003-02-09 17:25:21 +01:00
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}
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2013-04-17 04:20:48 +02:00
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} else {
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avio_w8(pb, 0); /* flags */
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avio_w8(pb, 0); /* background color index */
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avio_w8(pb, 0); /* aspect ratio */
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2003-02-09 17:25:21 +01:00
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}
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2002-04-08 14:32:01 +02:00
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2012-02-19 19:24:45 +01:00
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/* update: this is the 'NETSCAPE EXTENSION' that allows for looped animated
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* GIF, see http://members.aol.com/royalef/gifabout.htm#net-extension
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*
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* byte 1 : 33 (hex 0x21) GIF Extension code
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* byte 2 : 255 (hex 0xFF) Application Extension Label
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* byte 3 : 11 (hex (0x0B) Length of Application Block
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* (eleven bytes of data to follow)
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* bytes 4 to 11 : "NETSCAPE"
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* bytes 12 to 14 : "2.0"
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* byte 15 : 3 (hex 0x03) Length of Data Sub-Block
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* (three bytes of data to follow)
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* byte 16 : 1 (hex 0x01)
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* bytes 17 to 18 : 0 to 65535, an unsigned integer in
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* lo-hi byte format. This indicate the
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* number of iterations the loop should
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* be executed.
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* bytes 19 : 0 (hex 0x00) a Data Sub-block Terminator
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*/
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2005-06-18 03:52:24 +02:00
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2002-04-08 14:32:01 +02:00
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/* application extension header */
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#ifdef GIF_ADD_APP_HEADER
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2005-06-18 03:52:24 +02:00
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if (loop_count >= 0 && loop_count <= 65535) {
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2012-02-19 19:24:45 +01:00
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avio_w8(pb, 0x21);
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avio_w8(pb, 0xff);
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avio_w8(pb, 0x0b);
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// bytes 4 to 14
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avio_write(pb, "NETSCAPE2.0", sizeof("NETSCAPE2.0") - 1);
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2011-02-21 19:28:17 +01:00
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avio_w8(pb, 0x03); // byte 15
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avio_w8(pb, 0x01); // byte 16
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avio_wl16(pb, (uint16_t)loop_count);
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avio_w8(pb, 0x00); // byte 19
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2005-06-18 03:52:24 +02:00
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}
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2002-04-08 14:32:01 +02:00
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#endif
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return 0;
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}
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2003-02-03 23:52:38 +01:00
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typedef struct {
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2011-06-18 09:47:46 +02:00
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AVClass *class; /** Class for private options. */
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2003-02-11 17:35:48 +01:00
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int64_t time, file_time;
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uint8_t buffer[100]; /* data chunks */
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2011-06-18 09:47:46 +02:00
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int loop;
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2003-02-03 23:52:38 +01:00
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} GIFContext;
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static int gif_write_header(AVFormatContext *s)
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{
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GIFContext *gif = s->priv_data;
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2011-02-20 11:04:12 +01:00
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AVIOContext *pb = s->pb;
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2003-02-03 23:52:38 +01:00
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AVCodecContext *enc, *video_enc;
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2011-06-18 09:47:46 +02:00
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int i, width, height /*, rate*/;
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2013-04-17 04:20:48 +02:00
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uint32_t palette[AVPALETTE_COUNT];
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2003-02-03 23:52:38 +01:00
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/* XXX: do we reject audio streams or just ignore them ?
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2012-02-19 19:24:45 +01:00
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* if (s->nb_streams > 1)
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* return -1;
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*/
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gif->time = 0;
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2003-02-03 23:52:38 +01:00
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gif->file_time = 0;
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video_enc = NULL;
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2012-02-19 19:24:45 +01:00
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for (i = 0; i < s->nb_streams; i++) {
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2005-07-18 00:24:36 +02:00
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enc = s->streams[i]->codec;
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2010-03-31 01:30:55 +02:00
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if (enc->codec_type != AVMEDIA_TYPE_AUDIO)
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2003-02-03 23:52:38 +01:00
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video_enc = enc;
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}
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if (!video_enc) {
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av_free(gif);
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return -1;
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} else {
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2012-02-19 19:24:45 +01:00
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width = video_enc->width;
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2003-02-03 23:52:38 +01:00
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height = video_enc->height;
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2005-04-30 23:43:59 +02:00
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// rate = video_enc->time_base.den;
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2003-02-03 23:52:38 +01:00
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}
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2013-04-17 04:20:48 +02:00
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if (avpriv_set_systematic_pal2(palette, video_enc->pix_fmt) < 0) {
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av_assert0(video_enc->pix_fmt == AV_PIX_FMT_PAL8);
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gif_image_write_header(pb, width, height, gif->loop, NULL);
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} else {
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gif_image_write_header(pb, width, height, gif->loop, palette);
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2006-08-02 11:48:05 +02:00
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}
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2003-02-03 23:52:38 +01:00
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2011-03-14 20:39:06 +01:00
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avio_flush(s->pb);
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2003-02-03 23:52:38 +01:00
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return 0;
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}
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2012-02-19 19:24:45 +01:00
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static int gif_write_video(AVFormatContext *s, AVCodecContext *enc,
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const uint8_t *buf, int size)
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2003-02-03 23:52:38 +01:00
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{
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2011-02-20 11:04:12 +01:00
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AVIOContext *pb = s->pb;
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2003-02-03 23:52:38 +01:00
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int jiffies;
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/* graphic control extension block */
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2011-02-21 19:28:17 +01:00
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avio_w8(pb, 0x21);
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avio_w8(pb, 0xf9);
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avio_w8(pb, 0x04); /* block size */
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avio_w8(pb, 0x04); /* flags */
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2005-12-17 19:14:38 +01:00
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2003-02-03 23:52:38 +01:00
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/* 1 jiffy is 1/70 s */
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/* the delay_time field indicates the number of jiffies - 1 */
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/* XXX: should use delay, in order to be more accurate */
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/* instead of using the same rounded value each time */
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/* XXX: don't even remember if I really use it for now */
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2012-02-19 19:24:45 +01:00
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jiffies = (70 * enc->time_base.num / enc->time_base.den) - 1;
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2003-02-03 23:52:38 +01:00
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2011-02-21 19:28:17 +01:00
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avio_wl16(pb, jiffies);
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2003-02-03 23:52:38 +01:00
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2011-02-21 19:28:17 +01:00
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avio_w8(pb, 0x1f); /* transparent color index */
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avio_w8(pb, 0x00);
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2003-02-03 23:52:38 +01:00
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2013-04-17 04:20:48 +02:00
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avio_write(pb, buf, size);
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2002-04-08 14:32:01 +02:00
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return 0;
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}
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2004-05-29 04:06:32 +02:00
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static int gif_write_packet(AVFormatContext *s, AVPacket *pkt)
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2002-04-08 14:32:01 +02:00
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{
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2005-07-18 00:24:36 +02:00
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AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
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2010-03-31 01:30:55 +02:00
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if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
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2002-04-08 14:32:01 +02:00
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return 0; /* just ignore audio */
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else
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2004-05-29 04:06:32 +02:00
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return gif_write_video(s, codec, pkt->data, pkt->size);
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2002-04-08 14:32:01 +02:00
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}
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static int gif_write_trailer(AVFormatContext *s)
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{
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2011-02-20 11:04:12 +01:00
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AVIOContext *pb = s->pb;
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2002-04-08 14:32:01 +02:00
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2011-02-21 19:28:17 +01:00
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avio_w8(pb, 0x3b);
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2012-09-09 21:35:23 +02:00
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2002-04-08 14:32:01 +02:00
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return 0;
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}
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2011-06-18 09:47:46 +02:00
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#define OFFSET(x) offsetof(GIFContext, x)
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#define ENC AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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2012-02-19 19:24:45 +01:00
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{ "loop", "Number of times to loop the output.", OFFSET(loop),
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2012-08-31 12:22:31 +02:00
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AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 65535, ENC },
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2011-06-18 09:47:46 +02:00
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{ NULL },
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};
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static const AVClass gif_muxer_class = {
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.class_name = "GIF muxer",
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.item_name = av_default_item_name,
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.version = LIBAVUTIL_VERSION_INT,
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.option = options,
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};
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2011-01-25 23:03:28 +01:00
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AVOutputFormat ff_gif_muxer = {
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2012-02-19 19:24:45 +01:00
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.name = "gif",
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.long_name = NULL_IF_CONFIG_SMALL("GIF Animation"),
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.mime_type = "image/gif",
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.extensions = "gif",
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.priv_data_size = sizeof(GIFContext),
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2012-08-05 11:11:04 +02:00
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.audio_codec = AV_CODEC_ID_NONE,
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2013-04-17 04:20:48 +02:00
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.video_codec = AV_CODEC_ID_GIF,
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2012-02-19 19:24:45 +01:00
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.write_header = gif_write_header,
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.write_packet = gif_write_packet,
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.write_trailer = gif_write_trailer,
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.priv_class = &gif_muxer_class,
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2002-04-08 14:32:01 +02:00
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};
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