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per context frame_rate_base, this should finally fix frame_rate related av sync issues

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Originally committed as revision 1666 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
2003-03-12 15:16:19 +00:00
parent 586bc7553c
commit 14bea432f1
33 changed files with 282 additions and 148 deletions
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37
libavcodec/mpeg12.c
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@@ -203,8 +203,10 @@ static void mpeg1_encode_sequence_header(MpegEncContext *s)
int i, dmin, d;
s->frame_rate_index = 0;
dmin = 0x7fffffff;
for(i=1;i<9;i++) {
d = abs(s->frame_rate - frame_rate_tab[i]);
for(i=1;i<14;i++) {
if(s->avctx->strict_std_compliance >= 0 && i>=9) break;
d = abs(MPEG1_FRAME_RATE_BASE*(int64_t)s->avctx->frame_rate/s->avctx->frame_rate_base - frame_rate_tab[i]);
if (d < dmin) {
dmin = d;
s->frame_rate_index = i;
@@ -248,22 +250,22 @@ 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 = (int64_t)s->fake_picture_number * FRAME_RATE_BASE;
time_code = (int64_t)s->fake_picture_number * MPEG1_FRAME_RATE_BASE;
s->gop_picture_number = s->fake_picture_number;
put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
put_bits(&s->pb, 1, 1);
put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
put_bits(&s->pb, 6, (uint32_t)((time_code % fps) / FRAME_RATE_BASE));
put_bits(&s->pb, 6, (uint32_t)((time_code % fps) / MPEG1_FRAME_RATE_BASE));
put_bits(&s->pb, 1, 1); /* closed gop */
put_bits(&s->pb, 1, 0); /* broken link */
}
if (s->frame_rate < (24 * FRAME_RATE_BASE) && s->picture_number > 0) {
if (s->avctx->frame_rate < (24 * s->avctx->frame_rate_base) && s->picture_number > 0) {
/* 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 = (((int64_t)s->picture_number * fps) / s->frame_rate) - 1;
n = av_rescale((int64_t)s->picture_number * s->avctx->frame_rate_base, fps, s->avctx->frame_rate) / MPEG1_FRAME_RATE_BASE - 1;
while (s->fake_picture_number < n) {
mpeg1_skip_picture(s, s->fake_picture_number -
s->gop_picture_number);
@@ -1638,8 +1640,13 @@ static void mpeg_decode_sequence_extension(MpegEncContext *s)
s->low_delay = get_bits1(&s->gb);
frame_rate_ext_n = get_bits(&s->gb, 2);
frame_rate_ext_d = get_bits(&s->gb, 5);
if (frame_rate_ext_d >= 1)
s->frame_rate = (s->frame_rate * frame_rate_ext_n) / frame_rate_ext_d;
av_reduce(
&s->avctx->frame_rate,
&s->avctx->frame_rate_base,
frame_rate_tab[s->frame_rate_index] * (frame_rate_ext_n+1),
MPEG1_FRAME_RATE_BASE * (frame_rate_ext_d+1),
1<<30);
dprintf("sequence extension\n");
s->mpeg2 = 1;
s->avctx->sub_id = 2; /* indicates mpeg2 found */
@@ -1990,13 +1997,13 @@ static int mpeg1_decode_sequence(AVCodecContext *avctx,
s->avctx = avctx;
avctx->width = width;
avctx->height = height;
if (s->frame_rate_index >= 9) {
/* at least give a valid frame rate (some old mpeg1 have this) */
avctx->frame_rate = 25 * FRAME_RATE_BASE;
} else {
avctx->frame_rate = frame_rate_tab[s->frame_rate_index];
}
s->frame_rate = avctx->frame_rate;
av_reduce(
&avctx->frame_rate,
&avctx->frame_rate_base,
frame_rate_tab[s->frame_rate_index],
MPEG1_FRAME_RATE_BASE, //FIXME store in allready reduced form
1<<30
);
avctx->bit_rate = s->bit_rate;
if (MPV_common_init(s) < 0)