mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-27 09:52:17 +00:00
132 lines
4.1 KiB
C
132 lines
4.1 KiB
C
/*
|
|
* MJPEG/AVI1 to JPEG/JFIF bitstream format filter
|
|
* Copyright (c) 2010 Adrian Daerr and Nicolas George
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/*
|
|
* Adapted from mjpeg2jpeg.c, with original copyright:
|
|
* Paris 2010 Adrian Daerr, public domain
|
|
*/
|
|
|
|
#include <string.h>
|
|
|
|
#include "libavutil/error.h"
|
|
#include "libavutil/mem.h"
|
|
|
|
#include "avcodec.h"
|
|
#include "bsf.h"
|
|
#include "jpegtables.h"
|
|
|
|
static const uint8_t jpeg_header[] = {
|
|
0xff, 0xd8, // SOI
|
|
0xff, 0xe0, // APP0
|
|
0x00, 0x10, // APP0 header size (including
|
|
// this field, but excluding preceding)
|
|
0x4a, 0x46, 0x49, 0x46, 0x00, // ID string 'JFIF\0'
|
|
0x01, 0x01, // version
|
|
0x00, // bits per type
|
|
0x00, 0x00, // X density
|
|
0x00, 0x00, // Y density
|
|
0x00, // X thumbnail size
|
|
0x00, // Y thumbnail size
|
|
};
|
|
|
|
static const int dht_segment_size = 420;
|
|
static const uint8_t dht_segment_head[] = { 0xFF, 0xC4, 0x01, 0xA2, 0x00 };
|
|
static const uint8_t dht_segment_frag[] = {
|
|
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
|
|
0x0a, 0x0b, 0x01, 0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01,
|
|
0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
};
|
|
|
|
static uint8_t *append(uint8_t *buf, const uint8_t *src, int size)
|
|
{
|
|
memcpy(buf, src, size);
|
|
return buf + size;
|
|
}
|
|
|
|
static uint8_t *append_dht_segment(uint8_t *buf)
|
|
{
|
|
buf = append(buf, dht_segment_head, sizeof(dht_segment_head));
|
|
buf = append(buf, avpriv_mjpeg_bits_dc_luminance + 1, 16);
|
|
buf = append(buf, dht_segment_frag, sizeof(dht_segment_frag));
|
|
buf = append(buf, avpriv_mjpeg_val_dc, 12);
|
|
*(buf++) = 0x10;
|
|
buf = append(buf, avpriv_mjpeg_bits_ac_luminance + 1, 16);
|
|
buf = append(buf, avpriv_mjpeg_val_ac_luminance, 162);
|
|
*(buf++) = 0x11;
|
|
buf = append(buf, avpriv_mjpeg_bits_ac_chrominance + 1, 16);
|
|
buf = append(buf, avpriv_mjpeg_val_ac_chrominance, 162);
|
|
return buf;
|
|
}
|
|
|
|
static int mjpeg2jpeg_filter(AVBSFContext *ctx, AVPacket *out)
|
|
{
|
|
AVPacket *in;
|
|
int ret = 0;
|
|
int input_skip, output_size;
|
|
uint8_t *output;
|
|
|
|
ret = ff_bsf_get_packet(ctx, &in);
|
|
|
|
if (in->size < 12) {
|
|
av_log(ctx, AV_LOG_ERROR, "input is truncated\n");
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto fail;
|
|
}
|
|
if (memcmp("AVI1", in->data + 6, 4)) {
|
|
av_log(ctx, AV_LOG_ERROR, "input is not MJPEG/AVI1\n");
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto fail;
|
|
}
|
|
|
|
input_skip = (in->data[4] << 8) + in->data[5] + 4;
|
|
if (in->size < input_skip) {
|
|
av_log(ctx, AV_LOG_ERROR, "input is truncated\n");
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto fail;
|
|
}
|
|
output_size = in->size - input_skip +
|
|
sizeof(jpeg_header) + dht_segment_size;
|
|
ret = av_new_packet(out, output_size);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
output = out->data;
|
|
|
|
output = append(output, jpeg_header, sizeof(jpeg_header));
|
|
output = append_dht_segment(output);
|
|
output = append(output, in->data + input_skip, in->size - input_skip);
|
|
|
|
ret = av_packet_copy_props(out, in);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
fail:
|
|
if (ret < 0)
|
|
av_packet_unref(out);
|
|
av_packet_free(&in);
|
|
return ret;
|
|
}
|
|
|
|
const AVBitStreamFilter ff_mjpeg2jpeg_bsf = {
|
|
.name = "mjpeg2jpeg",
|
|
.filter = mjpeg2jpeg_filter,
|
|
};
|