2002-04-08 15:32:01 +03:00
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/*
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2006-10-23 11:57:54 +03:00
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* Animated GIF muxer
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2009-01-19 17:46:40 +02:00
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* Copyright (c) 2000 Fabrice Bellard
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2002-04-08 15:32:01 +03:00
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*
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2013-04-10 20:26:49 +03:00
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* first version by Francois Revol <revol@free.fr>
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*
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2006-10-07 18:30:46 +03:00
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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 01:34:32 +03:00
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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 18:30:46 +03:00
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* version 2.1 of the License, or (at your option) any later version.
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2002-04-08 15:32:01 +03:00
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*
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2006-10-07 18:30:46 +03:00
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* FFmpeg is distributed in the hope that it will be useful,
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2002-04-08 15:32:01 +03:00
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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2002-05-26 01:34:32 +03:00
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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 15:32:01 +03:00
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*
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2002-05-26 01:34:32 +03:00
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* You should have received a copy of the GNU Lesser General Public
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2006-10-07 18:30:46 +03:00
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* License along with FFmpeg; if not, write to the Free Software
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2006-01-13 00:43:26 +02:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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2002-04-08 15:32:01 +03:00
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*/
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#include "avformat.h"
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2013-04-17 05:20:48 +03:00
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#include "libavutil/avassert.h"
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#include "libavutil/imgutils.h"
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2011-06-18 10:47:46 +03:00
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#include "libavutil/log.h"
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#include "libavutil/opt.h"
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2009-01-14 02:27:43 +02:00
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2012-02-19 21:24:45 +03:00
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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 15:32:01 +03:00
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{
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2003-02-04 00:52:38 +02:00
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int i;
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2002-04-08 15:32:01 +03:00
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2011-02-24 08:36:04 +02:00
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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 20:28:17 +02:00
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avio_wl16(pb, width);
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avio_wl16(pb, height);
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2002-04-08 15:32:01 +03:00
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2013-04-17 05:20:48 +03:00
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if (palette) {
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2013-04-18 01:12:30 +03:00
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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 21:24:45 +03:00
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for (i = 0; i < 256; i++) {
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2013-04-18 02:13:17 +03:00
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const uint32_t v = palette[i] & 0xffffff;
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2013-04-18 01:17:58 +03:00
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avio_wb24(pb, v);
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2003-02-09 18:25:21 +02:00
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}
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2013-04-17 05:20:48 +03:00
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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 18:25:21 +02:00
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}
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2002-04-08 15:32:01 +03:00
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2013-04-18 14:01:56 +03:00
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/* "NETSCAPE EXTENSION" for looped animation GIF */
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avio_w8(pb, 0x21); /* GIF Extension code */
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avio_w8(pb, 0xff); /* Application Extension Label */
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avio_w8(pb, 0x0b); /* Length of Application Block */
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avio_write(pb, "NETSCAPE2.0", sizeof("NETSCAPE2.0") - 1);
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avio_w8(pb, 0x03); /* Length of Data Sub-Block */
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avio_w8(pb, 0x01);
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avio_wl16(pb, (uint16_t)loop_count);
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avio_w8(pb, 0x00); /* Data Sub-block Terminator */
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2005-06-18 04:52:24 +03:00
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2002-04-08 15:32:01 +03:00
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return 0;
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}
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2003-02-04 00:52:38 +02:00
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typedef struct {
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2011-06-18 10:47:46 +03:00
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AVClass *class; /** Class for private options. */
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int loop;
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2003-02-04 00:52:38 +02:00
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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 12:04:12 +02:00
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AVIOContext *pb = s->pb;
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2013-04-18 13:19:33 +03:00
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AVCodecContext *video_enc;
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int width, height;
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2013-04-17 05:20:48 +03:00
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uint32_t palette[AVPALETTE_COUNT];
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2003-02-04 00:52:38 +02:00
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2013-04-18 13:19:33 +03:00
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if (s->nb_streams != 1 || !s->streams[0]->codec ||
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s->streams[0]->codec->codec_type != AVMEDIA_TYPE_VIDEO) {
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av_log(s, AV_LOG_ERROR,
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"GIF supports only a single video stream.\n");
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return AVERROR(EINVAL);
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}
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video_enc = s->streams[0]->codec;
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width = video_enc->width;
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height = video_enc->height;
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2003-02-04 00:52:38 +02:00
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2013-04-17 05:20:48 +03:00
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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 12:48:05 +03:00
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}
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2003-02-04 00:52:38 +02:00
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2011-03-14 21:39:06 +02:00
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avio_flush(s->pb);
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2003-02-04 00:52:38 +02:00
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return 0;
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}
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2012-02-19 21:24:45 +03:00
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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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2003-02-04 00:52:38 +02:00
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{
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2011-02-20 12:04:12 +02:00
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AVIOContext *pb = s->pb;
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2003-02-04 00:52:38 +02:00
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int jiffies;
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/* graphic control extension block */
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2011-02-21 20:28:17 +02:00
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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 20:14:38 +02:00
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2003-02-04 00:52:38 +02:00
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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 21:24:45 +03:00
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jiffies = (70 * enc->time_base.num / enc->time_base.den) - 1;
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2003-02-04 00:52:38 +02:00
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2011-02-21 20:28:17 +02:00
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avio_wl16(pb, jiffies);
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2003-02-04 00:52:38 +02:00
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2011-02-21 20:28:17 +02:00
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avio_w8(pb, 0x1f); /* transparent color index */
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avio_w8(pb, 0x00);
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2003-02-04 00:52:38 +02:00
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2013-04-17 05:20:48 +03:00
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avio_write(pb, buf, size);
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2002-04-08 15:32:01 +03:00
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return 0;
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}
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2004-05-29 05:06:32 +03:00
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static int gif_write_packet(AVFormatContext *s, AVPacket *pkt)
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2002-04-08 15:32:01 +03:00
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{
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2005-07-18 01:24:36 +03:00
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AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
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2013-04-18 13:19:33 +03:00
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return gif_write_video(s, codec, pkt->data, pkt->size);
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2002-04-08 15:32:01 +03:00
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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 12:04:12 +02:00
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AVIOContext *pb = s->pb;
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2002-04-08 15:32:01 +03:00
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2011-02-21 20:28:17 +02:00
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avio_w8(pb, 0x3b);
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2012-09-09 22:35:23 +03:00
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2002-04-08 15:32:01 +03:00
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return 0;
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}
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2011-06-18 10:47:46 +03:00
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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 21:24:45 +03:00
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{ "loop", "Number of times to loop the output.", OFFSET(loop),
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2012-08-31 13:22:31 +03:00
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AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 65535, ENC },
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2011-06-18 10:47:46 +03:00
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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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2011-01-26 00:03:28 +02:00
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AVOutputFormat ff_gif_muxer = {
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2012-02-19 21:24:45 +03:00
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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 12:11:04 +03:00
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.audio_codec = AV_CODEC_ID_NONE,
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2013-04-17 05:20:48 +03:00
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.video_codec = AV_CODEC_ID_GIF,
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2012-02-19 21:24:45 +03:00
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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 15:32:01 +03:00
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};
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