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/*
* decode_mpeg2.c
*
* Copyright (C) Thomas Oestreich - June 2001
* Copyright (C) 1999-2001 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* 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 "tcinfo.h"
#include "ioaux.h"
#include "tc.h"
#include "libtc/libtc.h"
#if defined(HAVE_LIBMPEG2) && defined(HAVE_LIBMPEG2CONVERT)
#include <mpeg2dec/mpeg2.h>
#include <mpeg2dec/mpeg2convert.h>
#define BUFFER_SIZE 262144
static uint8_t buffer[BUFFER_SIZE];
/* ------------------------------------------------------------
* helper functions
* ------------------------------------------------------------*/
typedef void (*WriteDataFn)(decode_t *decode, const mpeg2_info_t *info,
const mpeg2_sequence_t *sequence);
static void show_accel(uint32_t mp_ac)
{
tc_log_info(__FILE__, "libmpeg2 acceleration: %s",
(mp_ac & MPEG2_ACCEL_X86_3DNOW) ? "3dnow" :
(mp_ac & MPEG2_ACCEL_X86_MMXEXT) ? "mmxext" :
(mp_ac & MPEG2_ACCEL_X86_MMX) ? "mmx" :
"none (plain C)");
}
#define WRITE_DATA(PBUF, LEN, TAG) do { \
int ret = tc_pwrite(decode->fd_out, PBUF, LEN); \
if(LEN != ret) { \
tc_log_error(__FILE__, "failed to write %s data" \
" of frame (len=%i)", \
TAG, ret); \
import_exit(1); \
} \
} while (0)
static void write_rgb24(decode_t *decode, const mpeg2_info_t *info,
const mpeg2_sequence_t *sequence)
{
int len = 0;
/* FIXME: move to libtc/tcframes routines? */
len = 3 * info->sequence->width * info->sequence->height;
WRITE_DATA(info->display_fbuf->buf[0], len, "RGB");
}
static void write_yuv420p(decode_t *decode, const mpeg2_info_t *info,
const mpeg2_sequence_t *sequence)
{
static const char *plane_id[] = { "Y", "U", "V" };
int len = 0;
/* FIXME: move to libtc/tcframes routines? */
len = sequence->width * sequence->height;
WRITE_DATA(info->display_fbuf->buf[0], len, plane_id[0]);
len = sequence->chroma_width * sequence->chroma_height;
WRITE_DATA(info->display_fbuf->buf[1], len, plane_id[1]);
WRITE_DATA(info->display_fbuf->buf[2], len, plane_id[2]);
}
/* ------------------------------------------------------------
* decoder entry point
* ------------------------------------------------------------*/
void decode_mpeg2(decode_t *decode)
{
mpeg2dec_t *decoder = NULL;
const mpeg2_info_t *info = NULL;
const mpeg2_sequence_t *sequence = NULL;
mpeg2_state_t state;
size_t size;
uint32_t ac = 0;
WriteDataFn writer = write_yuv420p;
if (decode->format == TC_CODEC_RGB) {
tc_log_info(__FILE__, "using libmpeg2convert"
" RGB24 conversion");
writer = write_rgb24;
}
ac = mpeg2_accel(MPEG2_ACCEL_DETECT);
show_accel(ac);
decoder = mpeg2_init();
if (decoder == NULL) {
tc_log_error(__FILE__, "Could not allocate a decoder object.");
import_exit(1);
}
info = mpeg2_info(decoder);
size = (size_t)-1;
do {
state = mpeg2_parse(decoder);
sequence = info->sequence;
switch (state) {
case STATE_BUFFER:
size = tc_pread(decode->fd_in, buffer, BUFFER_SIZE);
mpeg2_buffer(decoder, buffer, buffer + size);
break;
case STATE_SEQUENCE:
if (decode->format == TC_CODEC_RGB) {
mpeg2_convert(decoder, mpeg2convert_rgb24, NULL);
}
break;
case STATE_SLICE:
case STATE_END:
case STATE_INVALID_END:
if (info->display_fbuf) {
writer(decode, info, sequence);
}
break;
default:
/* can't happen */
break;
}
} while (size);
mpeg2_close(decoder);
import_exit(0);
}
#else /* defined(HAVE_LIBMPEG2) && defined(HAVE_LIBMPEG2CONVERT) */
void decode_mpeg2(decode_t *decode)
{
tc_log_error(__FILE__, "No support for MPEG2 configured -- exiting");
import_exit(1);
}
#endif /* defined(HAVE_LIBMPEG2) && defined(HAVE_LIBMPEG2CONVERT) */
/*************************************************************************/
/*
* 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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