/*
- * Animated GIF encoder
+ * Animated GIF muxer
* Copyright (c) 2000 Fabrice Bellard.
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
/* we use the standard 216 color palette */
/* this script was used to create the palette:
- * for r in 00 33 66 99 cc ff; do for g in 00 33 66 99 cc ff; do echo -n " "; for b in 00 33 66 99 cc ff; do
+ * for r in 00 33 66 99 cc ff; do for g in 00 33 66 99 cc ff; do echo -n " "; for b in 00 33 66 99 cc ff; do
* echo -n "{ 0x$r, 0x$g, 0x$b }, "; done; echo ""; done; done
*/
unsigned int bit_buf;
int bit_cnt;
-#ifdef STATS
- st_out_bit_counts[st_current_index] += n;
-#endif
// printf("put_bits=%d %x\n", n, value);
assert(n == 32 || value < (1U << n));
bit_cnt+=n;
} else {
bit_buf |= value << (bit_cnt);
-
+
*s->buf_ptr = bit_buf & 0xff;
s->buf_ptr[1] = (bit_buf >> 8) & 0xff;
s->buf_ptr[2] = (bit_buf >> 16) & 0xff;
s->buf_ptr[3] = (bit_buf >> 24) & 0xff;
-
+
//printf("bitbuf = %08x\n", bit_buf);
s->buf_ptr+=4;
if (s->buf_ptr >= s->buf_end)
/* !RevPutBitContext */
/* GIF header */
-static int gif_image_write_header(ByteIOContext *pb,
+static int gif_image_write_header(ByteIOContext *pb,
int width, int height, int loop_count,
uint32_t *palette)
{
/* the global palette */
if (!palette) {
- put_buffer(pb, (unsigned char *)gif_clut, 216*3);
+ put_buffer(pb, (const unsigned char *)gif_clut, 216*3);
for(i=0;i<((256-216)*3);i++)
put_byte(pb, 0);
} else {
}
}
- /* update: this is the 'NETSCAPE EXTENSION' that allows for looped animated gif
- see http://members.aol.com/royalef/gifabout.htm#net-extension
-
- byte 1 : 33 (hex 0x21) GIF Extension code
- byte 2 : 255 (hex 0xFF) Application Extension Label
- byte 3 : 11 (hex (0x0B) Length of Application Block
- (eleven bytes of data to follow)
- bytes 4 to 11 : "NETSCAPE"
- bytes 12 to 14 : "2.0"
- byte 15 : 3 (hex 0x03) Length of Data Sub-Block
- (three bytes of data to follow)
- byte 16 : 1 (hex 0x01)
- bytes 17 to 18 : 0 to 65535, an unsigned integer in
- lo-hi byte format. This indicate the
- number of iterations the loop should
- be executed.
- bytes 19 : 0 (hex 0x00) a Data Sub-block Terminator
- */
+ /* update: this is the 'NETSCAPE EXTENSION' that allows for looped animated gif
+ see http://members.aol.com/royalef/gifabout.htm#net-extension
+
+ byte 1 : 33 (hex 0x21) GIF Extension code
+ byte 2 : 255 (hex 0xFF) Application Extension Label
+ byte 3 : 11 (hex (0x0B) Length of Application Block
+ (eleven bytes of data to follow)
+ bytes 4 to 11 : "NETSCAPE"
+ bytes 12 to 14 : "2.0"
+ byte 15 : 3 (hex 0x03) Length of Data Sub-Block
+ (three bytes of data to follow)
+ byte 16 : 1 (hex 0x01)
+ bytes 17 to 18 : 0 to 65535, an unsigned integer in
+ lo-hi byte format. This indicate the
+ number of iterations the loop should
+ be executed.
+ bytes 19 : 0 (hex 0x00) a Data Sub-block Terminator
+ */
/* application extension header */
#ifdef GIF_ADD_APP_HEADER
}
-static int gif_image_write_image(ByteIOContext *pb,
+static int gif_image_write_image(ByteIOContext *pb,
int x1, int y1, int width, int height,
const uint8_t *buf, int linesize, int pix_fmt)
{
left-=GIF_CHUNKS;
}
put_byte(pb, 0x00); /* end of image block */
-
+
return 0;
}
video_enc = NULL;
for(i=0;i<s->nb_streams;i++) {
- enc = &s->streams[i]->codec;
+ enc = s->streams[i]->codec;
if (enc->codec_type != CODEC_TYPE_AUDIO)
video_enc = enc;
}
// rate = video_enc->time_base.den;
}
- /* XXX: is it allowed ? seems to work so far... */
- video_enc->pix_fmt = PIX_FMT_RGB24;
+ if (video_enc->pix_fmt != PIX_FMT_RGB24) {
+ av_log(s, AV_LOG_ERROR, "ERROR: gif only handles the rgb24 pixel format. Use -pix_fmt rgb24.\n");
+ return AVERROR_IO;
+ }
gif_image_write_header(pb, width, height, loop_count, NULL);
return 0;
}
-static int gif_write_video(AVFormatContext *s,
+static int gif_write_video(AVFormatContext *s,
AVCodecContext *enc, const uint8_t *buf, int size)
{
ByteIOContext *pb = &s->pb;
put_byte(pb, 0xf9);
put_byte(pb, 0x04); /* block size */
put_byte(pb, 0x04); /* flags */
-
+
/* 1 jiffy is 1/70 s */
/* the delay_time field indicates the number of jiffies - 1 */
delay = gif->file_time - gif->time;
static int gif_write_packet(AVFormatContext *s, AVPacket *pkt)
{
- AVCodecContext *codec = &s->streams[pkt->stream_index]->codec;
+ AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
if (codec->codec_type == CODEC_TYPE_AUDIO)
return 0; /* just ignore audio */
else
return 0;
}
-/* better than nothing gif image writer */
-int gif_write(ByteIOContext *pb, AVImageInfo *info)
-{
- gif_image_write_header(pb, info->width, info->height, AVFMT_NOOUTPUTLOOP,
- (uint32_t *)info->pict.data[1]);
- gif_image_write_image(pb, 0, 0, info->width, info->height,
- info->pict.data[0], info->pict.linesize[0],
- PIX_FMT_PAL8);
- put_byte(pb, 0x3b);
- put_flush_packet(pb);
- return 0;
-}
-
-static AVOutputFormat gif_oformat = {
+AVOutputFormat gif_muxer = {
"gif",
"GIF Animation",
"image/gif",
gif_write_packet,
gif_write_trailer,
};
-
-extern AVInputFormat gif_iformat;
-
-int gif_init(void)
-{
- av_register_output_format(&gif_oformat);
- av_register_input_format(&gif_iformat);
- return 0;
-}
projects / ffmpeg / blobdiff