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added jpeg image read/write

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Originally committed as revision 88 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard 2001-08-15 13:02:50 +00:00
parent 79ba6118b9
commit 3abf2c27c6
2 changed files with 245 additions and 98 deletions
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245
libav/jpeg.c Normal file
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@ -0,0 +1,245 @@
/*
* Miscellaneous MJPEG based formats
* Copyright (c) 2000 Gerard Lantau.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "avformat.h"
/* Multipart JPEG */
#define BOUNDARY_TAG "ffserver"
static int mpjpeg_write_header(AVFormatContext *s)
{
UINT8 buf1[256];
snprintf(buf1, sizeof(buf1), "--%s\n", BOUNDARY_TAG);
put_buffer(&s->pb, buf1, strlen(buf1));
put_flush_packet(&s->pb);
return 0;
}
static int mpjpeg_write_packet(AVFormatContext *s,
int stream_index, UINT8 *buf, int size)
{
UINT8 buf1[256];
snprintf(buf1, sizeof(buf1), "Content-type: image/jpeg\n\n");
put_buffer(&s->pb, buf1, strlen(buf1));
put_buffer(&s->pb, buf, size);
snprintf(buf1, sizeof(buf1), "\n--%s\n", BOUNDARY_TAG);
put_buffer(&s->pb, buf1, strlen(buf1));
put_flush_packet(&s->pb);
return 0;
}
static int mpjpeg_write_trailer(AVFormatContext *s)
{
return 0;
}
AVFormat mpjpeg_format = {
"mpjpeg",
"Mime multipart JPEG format",
"multipart/x-mixed-replace;boundary=" BOUNDARY_TAG,
"mjpg",
CODEC_ID_NONE,
CODEC_ID_MJPEG,
mpjpeg_write_header,
mpjpeg_write_packet,
mpjpeg_write_trailer,
};
/*************************************/
/* single frame JPEG */
static int single_jpeg_write_header(AVFormatContext *s)
{
return 0;
}
static int single_jpeg_write_packet(AVFormatContext *s, int stream_index,
UINT8 *buf, int size)
{
put_buffer(&s->pb, buf, size);
put_flush_packet(&s->pb);
return 1; /* no more data can be sent */
}
static int single_jpeg_write_trailer(AVFormatContext *s)
{
return 0;
}
AVFormat single_jpeg_format = {
"singlejpeg",
"single JPEG image",
"image/jpeg",
"jpg,jpeg",
CODEC_ID_NONE,
CODEC_ID_MJPEG,
single_jpeg_write_header,
single_jpeg_write_packet,
single_jpeg_write_trailer,
};
/*************************************/
/* multiple jpeg images */
typedef struct JpegContext {
char path[1024];
int img_number;
} JpegContext;
static int jpeg_write_header(AVFormatContext *s1)
{
JpegContext *s;
s = av_mallocz(sizeof(JpegContext));
if (!s)
return -1;
s1->priv_data = s;
nstrcpy(s->path, sizeof(s->path), s1->filename);
s->img_number = 1;
return 0;
}
static int jpeg_write_packet(AVFormatContext *s1, int stream_index,
UINT8 *buf, int size)
{
JpegContext *s = s1->priv_data;
char filename[1024];
ByteIOContext f1, *pb = &f1;
snprintf(filename, sizeof(filename), s->path, s->img_number);
if (url_fopen(pb, filename, URL_WRONLY) < 0)
return -EIO;
put_buffer(pb, buf, size);
put_flush_packet(pb);
url_fclose(pb);
s->img_number++;
return 0;
}
static int jpeg_write_trailer(AVFormatContext *s1)
{
JpegContext *s = s1->priv_data;
free(s);
return 0;
}
/***/
static int jpeg_read_header(AVFormatContext *s1, AVFormatParameters *ap)
{
JpegContext *s;
int i;
char buf[1024];
ByteIOContext pb1, *f = &pb1;
AVStream *st;
s = av_mallocz(sizeof(JpegContext));
if (!s)
return -1;
s1->priv_data = s;
nstrcpy(s->path, sizeof(s->path), s1->filename);
s1->nb_streams = 1;
st = av_mallocz(sizeof(AVStream));
if (!st) {
free(s);
return -ENOMEM;
}
s1->streams[0] = st;
s->img_number = 0;
/* try to find the first image */
for(i=0;i<5;i++) {
snprintf(buf, sizeof(buf), s->path, s->img_number);
if (url_fopen(f, buf, URL_RDONLY) >= 0)
break;
s->img_number++;
}
if (i == 5)
goto fail;
url_fclose(f);
st->codec.codec_type = CODEC_TYPE_VIDEO;
st->codec.codec_id = CODEC_ID_MJPEG;
if (!ap || !ap->frame_rate)
st->codec.frame_rate = 25 * FRAME_RATE_BASE;
else
st->codec.frame_rate = ap->frame_rate;
return 0;
fail:
free(s);
return -EIO;
}
static int jpeg_read_packet(AVFormatContext *s1, AVPacket *pkt)
{
JpegContext *s = s1->priv_data;
char filename[1024];
int size;
ByteIOContext f1, *f = &f1;
snprintf(filename, sizeof(filename), s->path, s->img_number);
f = &f1;
if (url_fopen(f, filename, URL_RDONLY) < 0)
return -EIO;
size = url_seek(url_fileno(f), 0, SEEK_END);
url_seek(url_fileno(f), 0, SEEK_SET);
av_new_packet(pkt, size);
pkt->stream_index = 0;
get_buffer(f, pkt->data, size);
url_fclose(f);
s->img_number++;
return 0;
}
static int jpeg_read_close(AVFormatContext *s1)
{
JpegContext *s = s1->priv_data;
free(s);
return 0;
}
AVFormat jpeg_format = {
"jpeg",
"JPEG image",
"image/jpeg",
"jpg,jpeg",
CODEC_ID_NONE,
CODEC_ID_MJPEG,
jpeg_write_header,
jpeg_write_packet,
jpeg_write_trailer,
jpeg_read_header,
jpeg_read_packet,
jpeg_read_close,
NULL,
AVFMT_NOFILE,
};

98
libav/jpegenc.c
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@ -1,98 +0,0 @@
/*
* Miscellaneous MJPEG based formats
* Copyright (c) 2000 Gerard Lantau.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "avformat.h"
/* Multipart JPEG */
#define BOUNDARY_TAG "ffserver"
static int mpjpeg_write_header(AVFormatContext *s)
{
UINT8 buf1[256];
snprintf(buf1, sizeof(buf1), "--%s\n", BOUNDARY_TAG);
put_buffer(&s->pb, buf1, strlen(buf1));
put_flush_packet(&s->pb);
return 0;
}
static int mpjpeg_write_packet(AVFormatContext *s,
int stream_index, UINT8 *buf, int size)
{
UINT8 buf1[256];
snprintf(buf1, sizeof(buf1), "Content-type: image/jpeg\n\n");
put_buffer(&s->pb, buf1, strlen(buf1));
put_buffer(&s->pb, buf, size);
snprintf(buf1, sizeof(buf1), "\n--%s\n", BOUNDARY_TAG);
put_buffer(&s->pb, buf1, strlen(buf1));
put_flush_packet(&s->pb);
return 0;
}
static int mpjpeg_write_trailer(AVFormatContext *s)
{
return 0;
}
AVFormat mpjpeg_format = {
"mpjpeg",
"Mime multipart JPEG format",
"multipart/x-mixed-replace;boundary=" BOUNDARY_TAG,
"mjpg",
CODEC_ID_NONE,
CODEC_ID_MJPEG,
mpjpeg_write_header,
mpjpeg_write_packet,
mpjpeg_write_trailer,
};
/* single frame JPEG */
static int jpeg_write_header(AVFormatContext *s)
{
return 0;
}
static int jpeg_write_packet(AVFormatContext *s, int stream_index,
UINT8 *buf, int size)
{
put_buffer(&s->pb, buf, size);
put_flush_packet(&s->pb);
return 1; /* no more data can be sent */
}
static int jpeg_write_trailer(AVFormatContext *s)
{
return 0;
}
AVFormat jpeg_format = {
"jpeg",
"JPEG image",
"image/jpeg",
"jpg,jpeg",
CODEC_ID_NONE,
CODEC_ID_MJPEG,
jpeg_write_header,
jpeg_write_packet,
jpeg_write_trailer,
};