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avoid overflow of picturenumber*fps*10000

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bug found by Lennert Buytenhek <buytenh@gnu.org>

Originally committed as revision 302 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-02-18 01:58:00 +00:00
parent 3696d2bb83
commit bb6f51aeab
2 changed files with 3 additions and 3 deletions
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2
libavcodec/h263.c
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@ -68,7 +68,7 @@ void h263_encode_picture_header(MpegEncContext * s, int picture_number)
s->gob_number = 0;
put_bits(&s->pb, 22, 0x20); /* PSC */
put_bits(&s->pb, 8, ((s->picture_number * 30 * FRAME_RATE_BASE) /
put_bits(&s->pb, 8, (((INT64)s->picture_number * 30 * FRAME_RATE_BASE) /
s->frame_rate) & 0xff);
put_bits(&s->pb, 1, 1); /* marker */

4
libavcodec/mpeg12.c
View File

@ -106,7 +106,7 @@ static void mpeg1_encode_sequence_header(MpegEncContext *s)
/* time code : we must convert from the real frame rate to a
fake mpeg frame rate in case of low frame rate */
fps = frame_rate_tab[s->frame_rate_index];
time_code = s->fake_picture_number * FRAME_RATE_BASE;
time_code = (INT64)s->fake_picture_number * FRAME_RATE_BASE;
s->gop_picture_number = s->fake_picture_number;
put_bits(&s->pb, 5, (UINT32)((time_code / (fps * 3600)) % 24));
put_bits(&s->pb, 6, (UINT32)((time_code / (fps * 60)) % 60));
@ -121,7 +121,7 @@ static void mpeg1_encode_sequence_header(MpegEncContext *s)
/* insert empty P pictures to slow down to the desired
frame rate. Each fake pictures takes about 20 bytes */
fps = frame_rate_tab[s->frame_rate_index];
n = ((s->picture_number * fps) / s->frame_rate) - 1;
n = (((INT64)s->picture_number * fps) / s->frame_rate) - 1;
while (s->fake_picture_number < n) {
mpeg1_skip_picture(s, s->fake_picture_number -
s->gop_picture_number);