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ffmpeg/libavformat/img2.c

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C
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/*
* Image format
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
* Copyright (c) 2004 Michael Niedermayer
*
* 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 "avformat.h"
typedef struct {
int img_first;
int img_last;
int img_number;
int img_count;
int is_pipe;
char path[1024];
} VideoData;
typedef struct {
enum CodecID id;
const char *str;
} IdStrMap;
static const IdStrMap img_tags[] = {
{ CODEC_ID_MJPEG , "jpeg"},
{ CODEC_ID_MJPEG , "jpg"},
{ CODEC_ID_LJPEG , "ljpg"},
{ CODEC_ID_MPEG1VIDEO, "mpg1-img"},
{ CODEC_ID_MPEG2VIDEO, "mpg2-img"},
{ CODEC_ID_MPEG4 , "mpg4-img"},
{ CODEC_ID_FFV1 , "ffv1-img"},
{0, NULL}
};
static enum CodecID av_str2id(const IdStrMap *tags, const char *str)
{
str= strrchr(str, '.');
if(!str) return CODEC_ID_NONE;
str++;
while (tags->id) {
int i;
for(i=0; toupper(tags->str[i]) == toupper(str[i]); i++){
if(tags->str[i]==0 && str[i]==0)
return tags->id;
}
tags++;
}
return CODEC_ID_NONE;
}
static const char *av_id2str(const IdStrMap *tags, enum CodecID id)
{
while (tags->id) {
if(tags->id == id)
return tags->str;
tags++;
}
return NULL;
}
/* 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){
*pfirst_index =
*plast_index = 1;
return 0;
}
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 && av_str2id(img_tags, p->filename))
return AVPROBE_SCORE_MAX;
else
return 0;
}
static int img_read_header(AVFormatContext *s1, AVFormatParameters *ap)
{
VideoData *s = s1->priv_data;
int first_index, last_index;
AVStream *st;
s1->ctx_flags |= AVFMTCTX_NOHEADER;
st = av_new_stream(s1, 0);
if (!st) {
av_free(s);
return -ENOMEM;
}
strcpy(s->path, s1->filename);
s->img_number = 0;
s->img_count = 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_first = first_index;
s->img_last = last_index;
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;
}
st->codec.codec_type = CODEC_TYPE_VIDEO;
st->codec.codec_id = av_str2id(img_tags, s->path);
return 0;
fail:
av_free(s);
return AVERROR_IO;
}
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) {
/* loop over input */
/* if (loop_input && s->img_number > s->img_last) {
s->img_number = s->img_first;
}*/
if (get_frame_filename(filename, sizeof(filename),
s->path, s->img_number)<0 && s->img_number > 1)
return AVERROR_IO;
f = &f1;
if (url_fopen(f, filename, URL_RDONLY) < 0)
return AVERROR_IO;
} else {
f = &s1->pb;
if (url_feof(f))
return AVERROR_IO;
}
if (s->is_pipe) {
av_new_packet(pkt, 4096);
}else{
av_new_packet(pkt, url_filesize(url_fileno(f)));
}
pkt->stream_index = 0;
pkt->flags |= PKT_FLAG_KEY;
ret = get_buffer(f, pkt->data, pkt->size);
if (!s->is_pipe) {
url_fclose(f);
}
if (ret <= 0) {
av_free_packet(pkt);
return AVERROR_IO; /* signal EOF */
} else {
s->img_count++;
s->img_number++;
return 0;
}
}
static int img_read_close(AVFormatContext *s1)
{
return 0;
}
/******************************************************/
/* image output */
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, AVPacket *pkt)
{
VideoData *img = s->priv_data;
ByteIOContext pb1, *pb;
char filename[1024];
if (!img->is_pipe) {
if (get_frame_filename(filename, sizeof(filename),
img->path, img->img_number) < 0 && img->img_number>1)
return AVERROR_IO;
pb = &pb1;
if (url_fopen(pb, filename, URL_WRONLY) < 0)
return AVERROR_IO;
} else {
pb = &s->pb;
}
put_buffer(pb, pkt->data, pkt->size);
put_flush_packet(pb);
if (!img->is_pipe) {
url_fclose(pb);
}
img->img_number++;
return 0;
}
static int img_write_trailer(AVFormatContext *s)
{
return 0;
}
/* input */
static AVInputFormat image2_iformat = {
"image2",
"image2 sequence",
sizeof(VideoData),
image_probe,
img_read_header,
img_read_packet,
img_read_close,
NULL,
NULL,
AVFMT_NOFILE,
};
static AVInputFormat image2pipe_iformat = {
"image2pipe",
"piped image2 sequence",
sizeof(VideoData),
NULL, /* no probe */
img_read_header,
img_read_packet,
img_read_close,
NULL,
};
/* output */
static AVOutputFormat image2_oformat = {
"image2",
"image2 sequence",
"",
"",
sizeof(VideoData),
CODEC_ID_NONE,
CODEC_ID_MJPEG,
img_write_header,
img_write_packet,
img_write_trailer,
AVFMT_NOFILE,
};
static AVOutputFormat image2pipe_oformat = {
"image2pipe",
"piped image2 sequence",
"",
"",
sizeof(VideoData),
CODEC_ID_NONE,
CODEC_ID_MJPEG,
img_write_header,
img_write_packet,
img_write_trailer,
};
int img2_init(void)
{
av_register_input_format(&image2_iformat);
av_register_output_format(&image2_oformat);
av_register_input_format(&image2pipe_iformat);
av_register_output_format(&image2pipe_oformat);
return 0;
}
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