mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
5509bffa88
Originally committed as revision 4842 to svn://svn.ffmpeg.org/ffmpeg/trunk
239 lines
6.2 KiB
C
239 lines
6.2 KiB
C
/*
|
|
* JPEG image format
|
|
* Copyright (c) 2003 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#include "avformat.h"
|
|
|
|
static int jpeg_probe(AVProbeData *pd)
|
|
{
|
|
if (pd->buf_size >= 64 &&
|
|
pd->buf[0] == 0xff && pd->buf[1] == 0xd8 && pd->buf[2] == 0xff)
|
|
return AVPROBE_SCORE_MAX;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
typedef struct JpegOpaque {
|
|
int (*alloc_cb)(void *opaque, AVImageInfo *info);
|
|
void *opaque;
|
|
int ret_code;
|
|
} JpegOpaque;
|
|
|
|
/* called by the codec to allocate the image */
|
|
static int jpeg_get_buffer(AVCodecContext *c, AVFrame *picture)
|
|
{
|
|
JpegOpaque *jctx = c->opaque;
|
|
AVImageInfo info1, *info = &info1;
|
|
int ret, i;
|
|
|
|
info->width = c->width;
|
|
info->height = c->height;
|
|
switch(c->pix_fmt) {
|
|
case PIX_FMT_YUV420P:
|
|
info->pix_fmt = PIX_FMT_YUVJ420P;
|
|
break;
|
|
case PIX_FMT_YUV422P:
|
|
info->pix_fmt = PIX_FMT_YUVJ422P;
|
|
break;
|
|
case PIX_FMT_YUV444P:
|
|
info->pix_fmt = PIX_FMT_YUVJ444P;
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
ret = jctx->alloc_cb(jctx->opaque, info);
|
|
if (ret) {
|
|
jctx->ret_code = ret;
|
|
return -1;
|
|
} else {
|
|
for(i=0;i<3;i++) {
|
|
picture->data[i] = info->pict.data[i];
|
|
picture->linesize[i] = info->pict.linesize[i];
|
|
}
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static void jpeg_img_copy(uint8_t *dst, int dst_wrap,
|
|
uint8_t *src, int src_wrap,
|
|
int width, int height)
|
|
{
|
|
for(;height > 0; height--) {
|
|
memcpy(dst, src, width);
|
|
dst += dst_wrap;
|
|
src += src_wrap;
|
|
}
|
|
}
|
|
|
|
/* XXX: libavcodec is broken for truncated jpegs! */
|
|
#define IO_BUF_SIZE (1024*1024)
|
|
|
|
static int jpeg_read(ByteIOContext *f,
|
|
int (*alloc_cb)(void *opaque, AVImageInfo *info), void *opaque)
|
|
{
|
|
AVCodecContext *c;
|
|
AVFrame *picture, picture1;
|
|
int len, size, got_picture, i;
|
|
uint8_t *inbuf_ptr, inbuf[IO_BUF_SIZE];
|
|
JpegOpaque jctx;
|
|
|
|
jctx.alloc_cb = alloc_cb;
|
|
jctx.opaque = opaque;
|
|
jctx.ret_code = -1; /* default return code is error */
|
|
|
|
c = avcodec_alloc_context();
|
|
if (!c)
|
|
return -1;
|
|
picture= avcodec_alloc_frame();
|
|
if (!picture) {
|
|
av_free(c);
|
|
return -1;
|
|
}
|
|
c->opaque = &jctx;
|
|
c->get_buffer = jpeg_get_buffer;
|
|
c->flags |= CODEC_FLAG_TRUNCATED; /* we dont send complete frames */
|
|
if (avcodec_open(c, &mjpeg_decoder) < 0)
|
|
goto fail1;
|
|
for(;;) {
|
|
size = get_buffer(f, inbuf, sizeof(inbuf));
|
|
if (size == 0)
|
|
break;
|
|
inbuf_ptr = inbuf;
|
|
while (size > 0) {
|
|
len = avcodec_decode_video(c, &picture1, &got_picture,
|
|
inbuf_ptr, size);
|
|
if (len < 0)
|
|
goto fail;
|
|
if (got_picture)
|
|
goto the_end;
|
|
size -= len;
|
|
inbuf_ptr += len;
|
|
}
|
|
}
|
|
the_end:
|
|
/* XXX: currently, the mjpeg decoder does not use AVFrame, so we
|
|
must do it by hand */
|
|
if (jpeg_get_buffer(c, picture) < 0)
|
|
goto fail;
|
|
for(i=0;i<3;i++) {
|
|
int w, h;
|
|
w = c->width;
|
|
h = c->height;
|
|
if (i >= 1) {
|
|
switch(c->pix_fmt) {
|
|
default:
|
|
case PIX_FMT_YUV420P:
|
|
w = (w + 1) >> 1;
|
|
h = (h + 1) >> 1;
|
|
break;
|
|
case PIX_FMT_YUV422P:
|
|
w = (w + 1) >> 1;
|
|
break;
|
|
case PIX_FMT_YUV444P:
|
|
break;
|
|
}
|
|
}
|
|
jpeg_img_copy(picture->data[i], picture->linesize[i],
|
|
picture1.data[i], picture1.linesize[i],
|
|
w, h);
|
|
}
|
|
jctx.ret_code = 0;
|
|
fail:
|
|
avcodec_close(c);
|
|
fail1:
|
|
av_free(picture);
|
|
av_free(c);
|
|
return jctx.ret_code;
|
|
}
|
|
|
|
#ifdef CONFIG_MUXERS
|
|
static int jpeg_write(ByteIOContext *pb, AVImageInfo *info)
|
|
{
|
|
AVCodecContext *c;
|
|
uint8_t *outbuf = NULL;
|
|
int outbuf_size, ret, size, i;
|
|
AVFrame *picture;
|
|
|
|
ret = -1;
|
|
c = avcodec_alloc_context();
|
|
if (!c)
|
|
return -1;
|
|
picture = avcodec_alloc_frame();
|
|
if (!picture)
|
|
goto fail2;
|
|
c->width = info->width;
|
|
c->height = info->height;
|
|
/* XXX: currently move that to the codec ? */
|
|
switch(info->pix_fmt) {
|
|
case PIX_FMT_YUVJ420P:
|
|
c->pix_fmt = PIX_FMT_YUV420P;
|
|
break;
|
|
case PIX_FMT_YUVJ422P:
|
|
c->pix_fmt = PIX_FMT_YUV422P;
|
|
break;
|
|
case PIX_FMT_YUVJ444P:
|
|
c->pix_fmt = PIX_FMT_YUV444P;
|
|
break;
|
|
default:
|
|
goto fail1;
|
|
}
|
|
for(i=0;i<3;i++) {
|
|
picture->data[i] = info->pict.data[i];
|
|
picture->linesize[i] = info->pict.linesize[i];
|
|
}
|
|
/* set the quality */
|
|
picture->quality = 3; /* XXX: a parameter should be used */
|
|
c->flags |= CODEC_FLAG_QSCALE;
|
|
|
|
if (avcodec_open(c, &mjpeg_encoder) < 0)
|
|
goto fail1;
|
|
|
|
/* XXX: needs to sort out that size problem */
|
|
outbuf_size = 1000000;
|
|
outbuf = av_malloc(outbuf_size);
|
|
|
|
size = avcodec_encode_video(c, outbuf, outbuf_size, picture);
|
|
if (size < 0)
|
|
goto fail;
|
|
put_buffer(pb, outbuf, size);
|
|
put_flush_packet(pb);
|
|
ret = 0;
|
|
|
|
fail:
|
|
avcodec_close(c);
|
|
av_free(outbuf);
|
|
fail1:
|
|
av_free(picture);
|
|
fail2:
|
|
av_free(c);
|
|
return ret;
|
|
}
|
|
#endif //CONFIG_MUXERS
|
|
|
|
AVImageFormat jpeg_image_format = {
|
|
"jpeg",
|
|
"jpg,jpeg",
|
|
jpeg_probe,
|
|
jpeg_read,
|
|
(1 << PIX_FMT_YUVJ420P) | (1 << PIX_FMT_YUVJ422P) | (1 << PIX_FMT_YUVJ444P),
|
|
#ifdef CONFIG_MUXERS
|
|
jpeg_write,
|
|
#else
|
|
NULL,
|
|
#endif //CONFIG_MUXERS
|
|
};
|