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lavf/gif: Add an option max_gif_delay to limit the frame duration.

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Allows playback for the sample from ticket #4369 in less than 18 hours.
This commit is contained in:
Carl Eugen Hoyos 2015-03-29 05:14:48 +02:00
parent 268ff17cb7
commit 7de0fefeb5
2 changed files with 8 additions and 0 deletions
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5
doc/demuxers.texi
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@ -205,6 +205,11 @@ It accepts the following options:
Set the minimum valid delay between frames in hundredths of seconds.
Range is 0 to 6000. Default value is 2.
@item max_gif_delay
Set the maximum valid delay between frames in hundredth of seconds.
Range is 0 to 65535. Default value is 65535 (nearly eleven minutes),
the maximum value allowed by the specification.
@item default_delay
Set the default delay between frames in hundredths of seconds.
Range is 0 to 6000. Default value is 10.

3
libavformat/gifdec.c
View File

@ -43,6 +43,7 @@ typedef struct GIFDemuxContext {
* invalid and set to value of default_delay.
*/
int min_delay;
int max_delay;
int default_delay;
/**
@ -159,6 +160,7 @@ static int gif_read_ext(AVFormatContext *s)
if (gdc->delay < gdc->min_delay)
gdc->delay = gdc->default_delay;
gdc->delay = FFMIN(gdc->delay, gdc->max_delay);
/* skip the rest of the Graphic Control Extension block */
if ((ret = avio_skip(pb, sb_size - 3)) < 0 )
@ -309,6 +311,7 @@ resync:
static const AVOption options[] = {
{ "min_delay" , "minimum valid delay between frames (in hundredths of second)", offsetof(GIFDemuxContext, min_delay) , AV_OPT_TYPE_INT, {.i64 = GIF_MIN_DELAY} , 0, 100 * 60, AV_OPT_FLAG_DECODING_PARAM },
{ "max_gif_delay", "maximum valid delay between frames (in hundredths of seconds)", offsetof(GIFDemuxContext, max_delay) , AV_OPT_TYPE_INT, {.i64 = 65535} , 0, 65535 , AV_OPT_FLAG_DECODING_PARAM },
{ "default_delay", "default delay between frames (in hundredths of second)" , offsetof(GIFDemuxContext, default_delay), AV_OPT_TYPE_INT, {.i64 = GIF_DEFAULT_DELAY}, 0, 100 * 60, AV_OPT_FLAG_DECODING_PARAM },
{ "ignore_loop" , "ignore loop setting (netscape extension)" , offsetof(GIFDemuxContext, ignore_loop) , AV_OPT_TYPE_INT, {.i64 = 1} , 0, 1, AV_OPT_FLAG_DECODING_PARAM },
{ NULL },