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update duration and start_time 

Originally committed as revision 2111 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard 2003-08-08 17:53:30 +00:00
parent 247eadca9d
commit ca1538f8d9
1 changed files with 70 additions and 18 deletions
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88
libavformat/img.c
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@ -33,6 +33,56 @@ typedef struct {
void *ptr;
} VideoData;
/* return -1 if no image found */
static int find_image_range(int *pfirst_index, int *plast_index,
const char *path)
{
char buf[1024];
int range, last_index, range1, first_index;
/* find the first image */
for(first_index = 0; first_index < 5; first_index++) {
if (get_frame_filename(buf, sizeof(buf), path, first_index) < 0)
goto fail;
if (url_exist(buf))
break;
}
if (first_index == 5)
goto fail;
/* find the last image */
last_index = first_index;
for(;;) {
range = 0;
for(;;) {
if (!range)
range1 = 1;
else
range1 = 2 * range;
if (get_frame_filename(buf, sizeof(buf), path,
last_index + range1) < 0)
goto fail;
if (!url_exist(buf))
break;
range = range1;
/* just in case... */
if (range >= (1 << 30))
goto fail;
}
/* we are sure than image last_index + range exists */
if (!range)
break;
last_index += range;
}
*pfirst_index = first_index;
*plast_index = last_index;
return 0;
fail:
return -1;
}
static int image_probe(AVProbeData *p)
{
if (filename_number_test(p->filename) >= 0 && guess_image_format(p->filename))
@ -55,7 +105,7 @@ static int read_header_alloc_cb(void *opaque, AVImageInfo *info)
static int img_read_header(AVFormatContext *s1, AVFormatParameters *ap)
{
VideoData *s = s1->priv_data;
int i, ret;
int ret, first_index, last_index;
char buf[1024];
ByteIOContext pb1, *f = &pb1;
AVStream *st;
@ -78,16 +128,26 @@ static int img_read_header(AVFormatContext *s1, AVFormatParameters *ap)
else
s->is_pipe = 1;
if (!ap || !ap->frame_rate) {
st->codec.frame_rate = 25;
st->codec.frame_rate_base = 1;
} else {
st->codec.frame_rate = ap->frame_rate;
st->codec.frame_rate_base = ap->frame_rate_base;
}
if (!s->is_pipe) {
/* try to find the first image */
for(i=0;i<5;i++) {
if (get_frame_filename(buf, sizeof(buf), s->path, s->img_number) < 0)
goto fail;
if (url_fopen(f, buf, URL_RDONLY) >= 0)
break;
s->img_number++;
}
if (i == 5)
if (find_image_range(&first_index, &last_index, s->path) < 0)
goto fail;
s->img_number = first_index;
/* compute duration */
st->start_time = 0;
st->duration = ((int64_t)AV_TIME_BASE *
(last_index - first_index + 1) *
st->codec.frame_rate_base) / st->codec.frame_rate;
if (get_frame_filename(buf, sizeof(buf), s->path, s->img_number) < 0)
goto fail;
if (url_fopen(f, buf, URL_RDONLY) < 0)
goto fail;
} else {
f = &s1->pb;
@ -110,14 +170,6 @@ static int img_read_header(AVFormatContext *s1, AVFormatParameters *ap)
st->codec.pix_fmt = s->pix_fmt;
s->img_size = avpicture_get_size(s->pix_fmt, s->width, s->height);
if (!ap || !ap->frame_rate){
st->codec.frame_rate = 25;
st->codec.frame_rate_base = 1;
}else{
st->codec.frame_rate = ap->frame_rate;
st->codec.frame_rate_base = ap->frame_rate_base;
}
return 0;
fail1:
if (!s->is_pipe)