154 lines
4.5 KiB
C++
154 lines
4.5 KiB
C++
// ------------------------------------------------------------------------
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// audioio-timidity.cpp: Interface class for Timidity++ input.
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// Copyright (C) 2000,2002,2004-2006,2008,2009 Kai Vehmanen
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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// ------------------------------------------------------------------------
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#include <string>
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#include <unistd.h> /* stat() */
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#include <sys/stat.h> /* stat() */
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#include <kvu_numtostr.h>
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#include "audioio-timidity.h"
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#include "eca-logger.h"
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string TIMIDITY_INTERFACE::default_timidity_cmd = "timidity -Or1S -id -s %s -o - %f";
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void TIMIDITY_INTERFACE::set_timidity_cmd(const std::string& value) { TIMIDITY_INTERFACE::default_timidity_cmd = value; }
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TIMIDITY_INTERFACE::TIMIDITY_INTERFACE(const std::string& name)
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: triggered_rep(false),
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finished_rep(false)
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{
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}
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TIMIDITY_INTERFACE::~TIMIDITY_INTERFACE(void)
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{
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clean_child(true);
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if (is_open() == true) {
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close();
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}
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}
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void TIMIDITY_INTERFACE::open(void) throw (AUDIO_IO::SETUP_ERROR &)
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{
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std::string urlprefix;
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struct stat buf;
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int ret = ::stat(label().c_str(), &buf);
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if (ret != 0) {
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size_t offset = label().find_first_of("://");
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if (offset == std::string::npos) {
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throw(SETUP_ERROR(SETUP_ERROR::io_mode, "AUDIOIO-TIMIDITY: Can't open file " + label() + "."));
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}
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else {
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urlprefix = std::string(label(), 0, offset);
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ECA_LOG_MSG(ECA_LOGGER::user_objects, "(audioio-timidity) Found url; protocol '" + urlprefix + "'.");
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}
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}
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/* decoder supports: s16 samples, 2 channels, srate configurable
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no support for: endianess (use native) */
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set_sample_format(ECA_AUDIO_FORMAT::sfmt_s16);
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set_channels(2);
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triggered_rep = false;
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finished_rep = false;
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AUDIO_IO::open();
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}
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void TIMIDITY_INTERFACE::close(void)
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{
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if (pid_of_child() > 0) {
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if (io_mode() == io_read) {
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kill_timidity();
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}
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}
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AUDIO_IO::close();
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}
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long int TIMIDITY_INTERFACE::read_samples(void* target_buffer,
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long int samples)
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{
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if (triggered_rep != true) {
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ECA_LOG_MSG(ECA_LOGGER::info, "WARNING: triggering an external program in real-time context");
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triggered_rep = true;
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fork_timidity();
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}
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bytes_read_rep = std::fread(target_buffer, 1, frame_size() * samples, f1_rep);
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if (bytes_read_rep < samples * frame_size() || bytes_read_rep == 0) {
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if (position_in_samples() == 0)
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ECA_LOG_MSG(ECA_LOGGER::info, "Can't start process \"" + TIMIDITY_INTERFACE::default_timidity_cmd + "\". Please check your ~/.ecasound/ecasoundrc.");
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finished_rep = true;
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triggered_rep = false;
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}
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else finished_rep = false;
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return(bytes_read_rep / frame_size());
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}
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void TIMIDITY_INTERFACE::kill_timidity(void)
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{
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ECA_LOG_MSG(ECA_LOGGER::user_objects, "(audioio-timidity) Cleaning Timidity++-child with pid=" + kvu_numtostr(pid_of_child()) + ".");
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clean_child();
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triggered_rep = false;
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}
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void TIMIDITY_INTERFACE::fork_timidity(void)
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{
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set_fork_command(TIMIDITY_INTERFACE::default_timidity_cmd);
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set_fork_file_name(label());
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set_fork_bits(bits());
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set_fork_channels(channels());
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set_fork_sample_rate(samples_per_second());
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fork_child_for_read();
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if (child_fork_succeeded() == true) {
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/* NOTE: the file description will be closed by
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* AUDIO_IO_FORKED_STREAM::clean_child() */
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filedes_rep = file_descriptor();
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f1_rep = fdopen(filedes_rep, "r"); /* not part of <cstdio> */
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if (f1_rep == 0) {
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finished_rep = true;
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triggered_rep = false;
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}
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}
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if (wait_for_child() != true) {
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finished_rep = true;
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triggered_rep = false;
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}
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}
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void TIMIDITY_INTERFACE::start_io(void)
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{
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if (triggered_rep != true) {
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if (io_mode() == io_read)
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fork_timidity();
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triggered_rep = true;
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}
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}
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void TIMIDITY_INTERFACE::stop_io(void)
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{
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if (triggered_rep == true) {
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if (io_mode() == io_read)
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clean_child(true);
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triggered_rep = false;
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}
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}
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