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/*
* export_mp2enc.c
*
* Georg Ludwig - January 2002
*
* Parts of export_wav and export_mpeg2enc used for this file
*
* 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_mp2enc.so"
#define MOD_VERSION "v1.0.11 (2006-03-16)"
#define MOD_CODEC "(audio) MPEG 1/2"
#include "transcode.h"
#include "avilib/wavlib.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#define CLAMP(x,l,h) x > h ? h : x < l ? l : x
static int verbose_flag = TC_QUIET;
static int capability_flag = TC_CAP_PCM;
#define MOD_PRE mp2enc
#include "export_def.h"
static FILE* pFile = NULL;
static WAV wav = NULL;
/* ------------------------------------------------------------
*
* open outputfile
*
* ------------------------------------------------------------*/
MOD_open
{
int verb;
/* check for mp2enc */
if (tc_test_program("mp2enc") != 0) return (TC_EXPORT_ERROR);
if (param->flag == TC_AUDIO)
{
char buf [PATH_MAX];
char mono[] = "-m";
char stereo[] = "-s";
int srate, brate;
char *chan;
int def_srate, def_brate;
char *def_chan;
verb = (verbose & TC_DEBUG) ? 2:0;
srate = (vob->mp3frequency != 0) ? vob->mp3frequency : vob->a_rate;
brate = vob->mp3bitrate;
chan = (vob->dm_chan>=2) ? stereo : mono;
def_srate = srate;
def_brate = brate;
def_chan = chan;
// default profile values, authority: videohelp and dvdfaq
switch(vob->mpeg_profile) {
case VCD_PAL: case VCD_NTSC: case VCD:
def_srate = 44100;
def_brate = 224;
def_chan = stereo;
break;
case SVCD_PAL: case SVCD_NTSC: case SVCD:
def_srate = 44100;
def_brate = CLAMP (brate, 64, 384);
def_chan = stereo;
break;
case XVCD_PAL: case XVCD_NTSC: case XVCD:
// check for invalid sample rate
if ((srate != 32000) && (srate != 44100) && (srate != 48000))
def_srate = 44100;
// don't change if valid rate
def_brate = CLAMP (brate, 64, 384);
def_chan = stereo;
break;
case DVD_PAL: case DVD_NTSC: case DVD:
def_srate = 48000;
def_brate = CLAMP (brate, 64, 384);
def_chan = stereo;
case PROF_NONE:
break;
}
// encoding values, let commandline override profile
if(!(vob->export_attributes & TC_EXPORT_ATTRIBUTE_ARATE))
if (srate != def_srate) {
tc_log_info(MOD_NAME, "export profile changed samplerate:"
" %d -> %d Hz.", srate, def_srate);
srate = def_srate;
}
if(!(vob->export_attributes & TC_EXPORT_ATTRIBUTE_ABITRATE))
if (brate != def_brate) {
tc_log_info(MOD_NAME, "export profile changed bitrate: "
"%d -> %d kbps.", brate, def_brate);
brate = def_brate;
}
if(!(vob->export_attributes & TC_EXPORT_ATTRIBUTE_ACHANS))
if (chan != def_chan) {
tc_log_info(MOD_NAME, "export profile changed channels: "
"mono -> stereo.");
chan = def_chan;
}
if(tc_snprintf(buf, PATH_MAX, "mp2enc -v %d -r %d -b %d %s -o \"%s\" %s", verb, srate, brate, chan, vob->audio_out_file, (vob->ex_a_string?vob->ex_a_string:"")) < 0) {
tc_log_perror(MOD_NAME, "cmd buffer overflow");
return(TC_EXPORT_ERROR);
}
if(verbose & TC_INFO) tc_log_info(MOD_NAME, "(%d/%d) cmd=%s",
(int)strlen(buf), PATH_MAX, buf);
if((pFile = popen (buf, "w")) == NULL)
return(TC_EXPORT_ERROR);
wav = wav_fdopen(fileno(pFile), WAV_WRITE|WAV_PIPE, NULL);
if (wav == NULL) {
tc_log_perror(MOD_NAME, "open wave stream");
return TC_EXPORT_ERROR;
}
wav_set_rate(wav, vob->a_rate);
wav_set_bitrate(wav, vob->dm_chan*vob->a_rate*vob->dm_bits/8);
wav_set_channels(wav, vob->dm_chan);
wav_set_bits(wav, vob->dm_bits);
return(0);
}
if (param->flag == TC_VIDEO)
return(0);
// invalid flag
return(TC_EXPORT_ERROR);
}
/* ------------------------------------------------------------
*
* init codec
*
* ------------------------------------------------------------*/
MOD_init
{
if(param->flag == TC_AUDIO)
{
return(0);
}
if (param->flag == TC_VIDEO)
return(0);
// invalid flag
return(TC_EXPORT_ERROR);
}
/* ------------------------------------------------------------
*
* encode and export frame
*
* ------------------------------------------------------------*/
MOD_encode
{
if(param->flag == TC_AUDIO)
{
if (wav_write_data(wav, param->buffer, param->size) != param->size)
{
tc_log_perror(MOD_NAME, "write audio frame");
return(TC_EXPORT_ERROR);
}
return (0);
}
if (param->flag == TC_VIDEO)
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 codec
*
* ------------------------------------------------------------*/
MOD_close
{
if (param->flag == TC_VIDEO)
return (0);
if (param->flag == TC_AUDIO)
{
if (wav != NULL) {
wav_close(wav);
wav = NULL;
}
if (pFile != NULL) {
pclose (pFile);
pFile = NULL;
}
return(0);
}
return (TC_EXPORT_ERROR);
}
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