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avformat/gif: Do not write GIF89a header if loop is set to -1.

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Eugene Dzhurinsky 2013-07-05 20:27:56 -04:00 committed by Michael Niedermayer
parent 9e214900ad
commit 09f59d6adf
1 changed files with 14 additions and 11 deletions
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25
libavformat/gif.c
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@ -52,15 +52,18 @@ static int gif_image_write_header(AVIOContext *pb, int width, int height,
avio_w8(pb, 0); /* aspect ratio */
}
/* "NETSCAPE EXTENSION" for looped animation GIF */
avio_w8(pb, 0x21); /* GIF Extension code */
avio_w8(pb, 0xff); /* Application Extension Label */
avio_w8(pb, 0x0b); /* Length of Application Block */
avio_write(pb, "NETSCAPE2.0", sizeof("NETSCAPE2.0") - 1);
avio_w8(pb, 0x03); /* Length of Data Sub-Block */
avio_w8(pb, 0x01);
avio_wl16(pb, (uint16_t)loop_count);
avio_w8(pb, 0x00); /* Data Sub-block Terminator */
if (loop_count >= 0 ) {
/* "NETSCAPE EXTENSION" for looped animation GIF */
avio_w8(pb, 0x21); /* GIF Extension code */
avio_w8(pb, 0xff); /* Application Extension Label */
avio_w8(pb, 0x0b); /* Length of Application Block */
avio_write(pb, "NETSCAPE2.0", sizeof("NETSCAPE2.0") - 1);
avio_w8(pb, 0x03); /* Length of Data Sub-Block */
avio_w8(pb, 0x01);
avio_wl16(pb, (uint16_t)loop_count);
avio_w8(pb, 0x00); /* Data Sub-block Terminator */
}
return 0;
}
@ -189,8 +192,8 @@ static int gif_write_trailer(AVFormatContext *s)
#define OFFSET(x) offsetof(GIFContext, x)
#define ENC AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "loop", "Number of times to loop the output.", OFFSET(loop),
AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 65535, ENC },
{ "loop", "Number of times to loop the output: -1 - no loop, 0 - infinite loop", OFFSET(loop),
AV_OPT_TYPE_INT, { .i64 = 0 }, -1, 65535, ENC },
{ "final_delay", "Force delay (in ms) after the last frame", OFFSET(last_delay),
AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 65535, ENC },
{ NULL },