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ffmpeg/libavformat/img.c

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/*
* Image format
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <unistd.h>
#include "avformat.h"
#include "os_support.h"
typedef struct {
int width;
int height;
int img_number;
int img_size;
AVImageFormat *img_fmt;
int pix_fmt;
int is_pipe;
char path[1024];
/* temporary usage */
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))
return AVPROBE_SCORE_MAX;
else
return 0;
}
static int read_header_alloc_cb(void *opaque, AVImageInfo *info)
{
VideoData *s = opaque;
s->width = info->width;
s->height = info->height;
s->pix_fmt = info->pix_fmt;
/* stop image reading but no error */
return 1;
}
static int img_read_header(AVFormatContext *s1, AVFormatParameters *ap)
{
VideoData *s = s1->priv_data;
int ret, first_index, last_index;
char buf[1024];
ByteIOContext pb1, *f = &pb1;
AVStream *st;
st = av_new_stream(s1, 0);
if (!st) {
av_free(s);
return -ENOMEM;
}
if (ap && ap->image_format)
s->img_fmt = ap->image_format;
strcpy(s->path, s1->filename);
s->img_number = 0;
/* find format */
if (s1->iformat->flags & AVFMT_NOFILE)
s->is_pipe = 0;
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) {
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;
}
ret = av_read_image(f, s1->filename, s->img_fmt, read_header_alloc_cb, s);
if (ret < 0)
goto fail1;
if (!s->is_pipe) {
url_fclose(f);
} else {
url_fseek(f, 0, SEEK_SET);
}
st->codec.codec_type = CODEC_TYPE_VIDEO;
st->codec.codec_id = CODEC_ID_RAWVIDEO;
st->codec.width = s->width;
st->codec.height = s->height;
st->codec.pix_fmt = s->pix_fmt;
s->img_size = avpicture_get_size(s->pix_fmt, s->width, s->height);
return 0;
fail1:
if (!s->is_pipe)
url_fclose(f);
fail:
av_free(s);
return -EIO;
}
static int read_packet_alloc_cb(void *opaque, AVImageInfo *info)
{
VideoData *s = opaque;
if (info->width != s->width ||
info->height != s->height)
return -1;
avpicture_fill(&info->pict, s->ptr, info->pix_fmt, info->width, info->height);
return 0;
}
static int img_read_packet(AVFormatContext *s1, AVPacket *pkt)
{
VideoData *s = s1->priv_data;
char filename[1024];
int ret;
ByteIOContext f1, *f;
if (!s->is_pipe) {
if (get_frame_filename(filename, sizeof(filename),
s->path, s->img_number) < 0)
return -EIO;
f = &f1;
if (url_fopen(f, filename, URL_RDONLY) < 0)
return -EIO;
} else {
f = &s1->pb;
if (url_feof(f))
return -EIO;
}
av_new_packet(pkt, s->img_size);
pkt->stream_index = 0;
s->ptr = pkt->data;
ret = av_read_image(f, filename, s->img_fmt, read_packet_alloc_cb, s);
if (!s->is_pipe) {
url_fclose(f);
}
if (ret < 0) {
av_free_packet(pkt);
return -EIO; /* signal EOF */
} else {
pkt->pts = av_rescale((int64_t)s->img_number * s1->streams[0]->codec.frame_rate_base, s1->pts_den, s1->streams[0]->codec.frame_rate) / s1->pts_num;
s->img_number++;
return 0;
}
}
static int img_read_close(AVFormatContext *s1)
{
return 0;
}
/******************************************************/
/* image output */
static int img_set_parameters(AVFormatContext *s, AVFormatParameters *ap)
{
VideoData *img = s->priv_data;
AVStream *st;
AVImageFormat *img_fmt;
int i;
/* find output image format */
if (ap && ap->image_format) {
img_fmt = ap->image_format;
} else {
img_fmt = guess_image_format(s->filename);
}
if (!img_fmt)
return -1;
if (s->nb_streams != 1)
return -1;
st = s->streams[0];
/* we select the first matching format */
for(i=0;i<PIX_FMT_NB;i++) {
if (img_fmt->supported_pixel_formats & (1 << i))
break;
}
if (i >= PIX_FMT_NB)
return -1;
img->img_fmt = img_fmt;
img->pix_fmt = i;
st->codec.pix_fmt = img->pix_fmt;
return 0;
}
static int img_write_header(AVFormatContext *s)
{
VideoData *img = s->priv_data;
img->img_number = 1;
strcpy(img->path, s->filename);
/* find format */
if (s->oformat->flags & AVFMT_NOFILE)
img->is_pipe = 0;
else
img->is_pipe = 1;
return 0;
}
static int img_write_packet(AVFormatContext *s, int stream_index,
uint8_t *buf, int size, int force_pts)
{
VideoData *img = s->priv_data;
AVStream *st = s->streams[stream_index];
ByteIOContext pb1, *pb;
AVPicture *picture;
int width, height, ret;
char filename[1024];
AVImageInfo info;
width = st->codec.width;
height = st->codec.height;
picture = (AVPicture *)buf;
if (!img->is_pipe) {
if (get_frame_filename(filename, sizeof(filename),
img->path, img->img_number) < 0)
return -EIO;
pb = &pb1;
if (url_fopen(pb, filename, URL_WRONLY) < 0)
return -EIO;
} else {
pb = &s->pb;
}
info.width = width;
info.height = height;
info.pix_fmt = st->codec.pix_fmt;
info.pict = *picture;
ret = av_write_image(pb, img->img_fmt, &info);
if (!img->is_pipe) {
url_fclose(pb);
}
img->img_number++;
return 0;
}
static int img_write_trailer(AVFormatContext *s)
{
return 0;
}
/* input */
static AVInputFormat image_iformat = {
"image",
"image sequence",
sizeof(VideoData),
image_probe,
img_read_header,
img_read_packet,
img_read_close,
NULL,
AVFMT_NOFILE | AVFMT_NEEDNUMBER,
};
static AVInputFormat imagepipe_iformat = {
"imagepipe",
"piped image sequence",
sizeof(VideoData),
NULL, /* no probe */
img_read_header,
img_read_packet,
img_read_close,
NULL,
};
/* output */
static AVOutputFormat image_oformat = {
"image",
"image sequence",
"",
"",
sizeof(VideoData),
CODEC_ID_NONE,
CODEC_ID_RAWVIDEO,
img_write_header,
img_write_packet,
img_write_trailer,
AVFMT_NOFILE | AVFMT_NEEDNUMBER | AVFMT_RAWPICTURE,
img_set_parameters,
};
static AVOutputFormat imagepipe_oformat = {
"imagepipe",
"piped image sequence",
"",
"",
sizeof(VideoData),
CODEC_ID_NONE,
CODEC_ID_RAWVIDEO,
img_write_header,
img_write_packet,
img_write_trailer,
AVFMT_RAWPICTURE,
img_set_parameters,
};
int img_init(void)
{
av_register_input_format(&image_iformat);
av_register_output_format(&image_oformat);
av_register_input_format(&imagepipe_iformat);
av_register_output_format(&imagepipe_oformat);
return 0;
}
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