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/*
* export_jpg.c
*
* Copyright (C) Tilmann Bitterberg - September 2002
*
* This file is part of transcode, a video stream processing tool
*
* transcode 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, or (at your option)
* any later version.
*
* transcode 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 GNU Make; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#define MOD_NAME "export_jpg.so"
#define MOD_VERSION "v0.2.1 (2003-08-06)"
#define MOD_CODEC "(video) *"
#include "transcode.h"
#include <stdio.h>
#include <stdlib.h>
#include "jpeglib.h"
static int verbose_flag=TC_QUIET;
static int capability_flag=TC_CAP_YUV|TC_CAP_RGB|TC_CAP_PCM|TC_CAP_AUD;
#define MOD_PRE jpg
#include "export_def.h"
static char buf2[PATH_MAX];
static int codec, width, height;
static int counter=0;
static const char *prefix="frame.";
static int jpeg_quality =0;
#define JPEG_DEFAULT_QUALITY 85
static int interval=1;
static unsigned int int_counter=0;
JSAMPLE * image_buffer; /* Points to large array of R,G,B-order data */
static unsigned char **line[3];
/* ------------------------------------------------------------
*
* init codec
*
* ------------------------------------------------------------*/
// native YUV jpeg encoder code based on encode_JPEG of the quicktime4linux lib
//
static void write_yuv_JPEG_file(char *filename, int quality,
unsigned char **input,
int _width, int _height)
{
int i, j, k;
int width = _width;
int height = _height;
unsigned char *base[3];
struct jpeg_compress_struct encinfo;
struct jpeg_error_mgr jerr;
FILE * outfile; /* target file */
jpeg_create_compress(&encinfo);
encinfo.err = jpeg_std_error(&jerr);
if ((outfile = fopen(filename, "wb")) == NULL) {
tc_log_error(MOD_NAME, "can't open %s", filename);
}
jpeg_stdio_dest(&encinfo, outfile);
encinfo.image_width = width;
encinfo.image_height = height;
encinfo.input_components = 3;
jpeg_set_defaults(&encinfo);
encinfo.dct_method = JDCT_FASTEST;
jpeg_set_quality(&encinfo, quality, TRUE);
encinfo.raw_data_in = TRUE;
#if JPEG_LIB_VERSION >= 70
encinfo.do_fancy_downsampling = FALSE;
#endif
encinfo.in_color_space = JCS_YCbCr;
encinfo.comp_info[0].h_samp_factor = 2;
encinfo.comp_info[0].v_samp_factor = 2;
encinfo.comp_info[1].h_samp_factor = 1;
encinfo.comp_info[1].v_samp_factor = 1;
encinfo.comp_info[2].h_samp_factor = 1;
encinfo.comp_info[2].v_samp_factor = 1;
jpeg_start_compress(&encinfo, TRUE);
base[0] = input[0];
base[1] = input[1];
base[2] = input[2];
for (i = 0; i < height; i += 2*DCTSIZE) {
for (j=0, k=0; j<2*DCTSIZE;j+=2, k++) {
line[0][j] = base[0]; base[0] += width;
line[0][j+1] = base[0]; base[0] += width;
line[1][k] = base[1]; base[1] += width/2;
line[2][k] = base[2]; base[2] += width/2;
}
jpeg_write_raw_data(&encinfo, line, 2*DCTSIZE);
}
jpeg_finish_compress(&encinfo);
fclose(outfile);
jpeg_destroy_compress(&encinfo);
}
static void write_rgb_JPEG_file (char * filename, int quality, int width, int height)
{
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
/* More stuff */
FILE * outfile; /* target file */
JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */
int row_stride; /* physical row width in image buffer */
/* Step 1: allocate and initialize JPEG compression object */
cinfo.err = jpeg_std_error(&jerr);
/* Now we can initialize the JPEG compression object. */
jpeg_create_compress(&cinfo);
/* Step 2: specify data destination (eg, a file) */
/* Note: steps 2 and 3 can be done in either order. */
if ((outfile = fopen(filename, "wb")) == NULL) {
tc_log_error(MOD_NAME, "can't open %s", filename);
}
jpeg_stdio_dest(&cinfo, outfile);
/* Step 3: set parameters for compression */
/* First we supply a description of the input image.
* Four fields of the cinfo struct must be filled in:
*/
cinfo.image_width = width; /* image width and height, in pixels */
cinfo.image_height = height;
cinfo.input_components = 3; /* # of color components per pixel */
cinfo.in_color_space = JCS_RGB; /* colorspace of input image */
jpeg_set_defaults(&cinfo);
/* Now you can set any non-default parameters you wish to.
* Here we just illustrate the use of quality (quantization table) scaling:
*/
jpeg_set_quality(&cinfo, quality, TRUE); /* limit to baseline-JPEG values */
/* Step 4: Start compressor */
/* TRUE ensures that we will write a complete interchange-JPEG file.
* Pass TRUE unless you are very sure of what you're doing.
*/
jpeg_start_compress(&cinfo, TRUE);
/* Step 5: while (scan lines remain to be written) */
/* jpeg_write_scanlines(...); */
row_stride = cinfo.image_width * 3; /* JSAMPLEs per row in image_buffer */
while (cinfo.next_scanline < cinfo.image_height) {
row_pointer[0] = & image_buffer[cinfo.next_scanline * row_stride];
(void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
}
/* Step 6: Finish compression */
jpeg_finish_compress(&cinfo);
/* After finish_compress, we can close the output file. */
fclose(outfile);
/* Step 7: release JPEG compression object */
/* This is an important step since it will release a good deal of memory. */
jpeg_destroy_compress(&cinfo);
}
MOD_init
{
/* set the 'spit-out-frame' interval */
interval = vob->frame_interval;
if(param->flag == TC_VIDEO) {
width = vob->ex_v_width;
height = vob->ex_v_height;
codec = (vob->im_v_codec == CODEC_YUV) ? CODEC_YUV : CODEC_RGB;
if(vob->im_v_codec == CODEC_YUV) {
line[0] = malloc(height*sizeof(char*));
line[1] = malloc(height*sizeof(char*)/2);
line[2] = malloc(height*sizeof(char*)/2);
}
return(0);
}
if(param->flag == TC_AUDIO) return(0);
// invalid flag
return(TC_EXPORT_ERROR);
}
/* ------------------------------------------------------------
*
* open outputfile
*
* ------------------------------------------------------------*/
MOD_open
{
if(param->flag == TC_VIDEO) {
// video
switch(vob->im_v_codec) {
case CODEC_YUV:
case CODEC_RGB:
if(vob->video_out_file!=NULL && strcmp(vob->video_out_file,"/dev/null")!=0) prefix=vob->video_out_file;
break;
default:
tc_log_warn(MOD_NAME, "codec not supported (0x%x)", vob->im_v_codec);
return(TC_EXPORT_ERROR);
break;
}
if(vob->ex_v_fcc != NULL && strlen(vob->ex_v_fcc) != 0) {
jpeg_quality=atoi(vob->ex_v_fcc);
if (jpeg_quality<=0) jpeg_quality = JPEG_DEFAULT_QUALITY;
if (jpeg_quality>100) jpeg_quality = 100;
} else {
jpeg_quality=75;
}
return(0);
}
if(param->flag == TC_AUDIO) return(0);
// invalid flag
return(TC_EXPORT_ERROR);
}
/* ------------------------------------------------------------
*
* encode and export
*
* ------------------------------------------------------------*/
MOD_encode
{
char *out_buffer = param->buffer;
if ((++int_counter-1) % interval != 0)
return (0);
if(param->flag == TC_VIDEO) {
if(tc_snprintf(buf2, PATH_MAX, "%s%06d.%s", prefix, counter++, "jpg") < 0) {
tc_log_perror(MOD_NAME, "cmd buffer overflow");
return(TC_EXPORT_ERROR);
}
if(codec==CODEC_YUV) {
unsigned char *base[3];
YUV_INIT_PLANES(base, param->buffer, IMG_YUV420P, width, height);
write_yuv_JPEG_file(buf2, jpeg_quality, base, width, height);
//out_buffer = tmp_buffer;
} else {
image_buffer = out_buffer;
write_rgb_JPEG_file(buf2, jpeg_quality, width, height);
}
return(0);
}
if(param->flag == TC_AUDIO) return(0);
// invalid flag
return(TC_EXPORT_ERROR);
}
/* ------------------------------------------------------------
*
* stop encoder
*
* ------------------------------------------------------------*/
MOD_stop
{
if(param->flag == TC_VIDEO) {
return(0);
}
if(param->flag == TC_AUDIO) return(0);
return(TC_EXPORT_ERROR);
}
/* ------------------------------------------------------------
*
* close outputfiles
*
* ------------------------------------------------------------*/
MOD_close
{
if(param->flag == TC_AUDIO) return(0);
if(param->flag == TC_VIDEO) return(0);
return(TC_EXPORT_ERROR);
}
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