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/*
* decode_yuv.c
*
* Copyright (C) Thomas Oestreich - June 2001
*
* 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.
*
*/
#include "transcode.h"
#include "libtc/libtc.h"
#include "tcinfo.h"
#include "aclib/imgconvert.h"
#include "ioaux.h"
#include "tc.h"
/*
* About this code:
*
* based on video_out.h, video_out.c, video_out_ppm.c
*
* Copyright (C) 1999-2001 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
* Stripped and rearranged for transcode by
* Francesco Romani <fromani@gmail.com> - July 2005
*
* This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
*
* What?
* Basically, this code does only a colorspace conversion from ingress frames
* (YV12) to egress frames (RGB). It uses basically the same routines of libvo
* and old decode_yuv.c
*
* Why?
* decode_yuv was the one and the only transcode module which uses the main
* libvo routines, not the colorspace conversion ones. It not make sense to me
* to have an extra library just for one module, so I stripped down to minimum
* the libvo code used by decode_yuv.c and I moved it here.
* This code has only few things recalling it's ancestor, but I'm still remark
* it's origin.
*/
typedef struct vo_s {
// frame size
unsigned int width;
unsigned int height;
// internal frame buffers
uint8_t *rgb;
uint8_t *yuv[3];
} vo_t;
#define vo_convert(instp) \
ac_imgconvert((instp)->yuv, IMG_YUV420P, &(instp)->rgb, IMG_RGB24, \
(instp)->width, (instp)->height)
#define READ_PLANE(fd, V, H, plane) do { \
int i, bytes; \
\
for (i = 0; i < (V); i++) { \
bytes = tc_pread((fd), (plane) + i * (H), (H)); \
if (bytes != (H)) { \
if (bytes < 0) \
tc_log_error(__FILE__, "read failed: %s", strerror(errno)); \
return 0; \
} \
} \
} while (0)
/*
* legacy (and working :) ) code:
* read one YUV420P plane at time from file descriptor (pipe, usually)
* and store it in internal buffer
*/
static int vo_read_yuv(vo_t *vo, int fd)
{
unsigned int v = vo->height, h = vo->width;
/* Read luminance scanlines */
READ_PLANE(fd, v, h, vo->yuv[0]);
v /= 2;
h /= 2;
/* Read chrominance scanlines */
READ_PLANE(fd, v, h, vo->yuv[1]);
READ_PLANE(fd, v, h, vo->yuv[2]);
return 1;
}
#undef READ_PLANE
/*
* simpler than above:
* write the whole RGB buffer in to file descriptor (pipe, usually).
* WARNING: caller must ensure that RGB buffer holds valid data by
* invoking vo_convert *before* invoking this function
*/
static int vo_write_rgb (vo_t *vo, int fd)
{
int framesize = vo->width * vo->height * 3;
int bytes = tc_pwrite(fd, vo->rgb, framesize);
if (bytes != framesize) {
if (bytes < 0)
tc_log_error(__FILE__, "read failed: %s", strerror(errno));
return 0;
}
return 1;
}
/*
* finalize a vo structure, free()ing it's internal buffers.
* WARNING: DOES NOT cause a buffer flush, you must do it manually.
*/
static void vo_clean (vo_t *vo)
{
free(vo->yuv[0]);
free(vo->yuv[1]);
free(vo->yuv[2]);
free(vo->rgb);
}
/*
* initialize a vo structure, allocate internal buffers
* and so on
*/
static int vo_alloc(vo_t *vo, int width, int height)
{
if (width <= 0 || height <= 0) {
return -1;
}
vo->width = (unsigned int)width;
vo->height = (unsigned int)height;
vo->yuv[0] = tc_zalloc(width * height);
if (!vo->yuv[0]) {
tc_log_error(__FILE__, "out of memory");
return -1;
}
vo->yuv[1] = tc_zalloc((width/2) * (height/2));
if (!vo->yuv[1]) {
tc_log_error(__FILE__, "out of memory");
free(vo->yuv[0]);
return -1;
}
vo->yuv[2] = tc_zalloc((width/2) * (height/2));
if (!vo->yuv[2]) {
tc_log_error(__FILE__, "out of memory");
free(vo->yuv[0]);
free(vo->yuv[1]);
return -1;
}
vo->rgb = tc_zalloc(width * height * 3);
if (!vo->rgb) {
tc_log_error(__FILE__, "out of memory");
free(vo->yuv[0]);
free(vo->yuv[1]);
free(vo->yuv[2]);
return -1;
}
return 0;
}
/* ------------------------------------------------------------
*
* decoder thread
*
* ------------------------------------------------------------*/
void decode_yuv(decode_t *decode)
{
vo_t vo;
if (decode->width <= 0 || decode->height <= 0) {
tc_log_error(__FILE__, "invalid frame parameter %dx%d",
decode->width, decode->height);
import_exit(1);
}
vo_alloc(&vo, decode->width, decode->height);
// read frame by frame - decode into RGB - pipe to stdout
while (vo_read_yuv(&vo, decode->fd_in)) {
vo_convert(&vo);
vo_write_rgb(&vo, decode->fd_out);
}
// ends
vo_clean(&vo);
import_exit(0);
}
/*************************************************************************/
/*
* Local variables:
* c-file-style: "stroustrup"
* c-file-offsets: ((case-label . *) (statement-case-intro . *))
* indent-tabs-mode: nil
* End:
*
* vim: expandtab shiftwidth=4:
*/
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