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Separate low level details of SMF reading/writing from concept of 'midi source in ardour'.

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git-svn-id: svn://localhost/ardour2/branches/3.0@3839 d708f5d6-7413-0410-9779-e7cbd77b26cf
This commit is contained in:
David Robillard 2008-09-30 00:45:26 +00:00
parent b5ec66ae6c
commit 9a30bb2aec
12 changed files with 546 additions and 430 deletions
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5
gtk2_ardour/sfdb_ui.cc
View File

@ -37,12 +37,13 @@
#include <gtkmm2ext/utils.h>
#include <evoral/SMFReader.hpp>
#include <ardour/audio_library.h>
#include <ardour/auditioner.h>
#include <ardour/audioregion.h>
#include <ardour/audiofilesource.h>
#include <ardour/smf_source.h>
#include <ardour/smf_reader.h>
#include <ardour/region_factory.h>
#include <ardour/source_factory.h>
#include <ardour/session.h>
@ -1097,7 +1098,7 @@ SoundFileOmega::check_info (const vector<ustring>& paths, bool& same_size, bool&
} else if (SMFSource::safe_file_extension (*i)) {
SMFReader reader(*i);
Evoral::SMFReader reader(*i);
if (reader.num_tracks() > 1) {
multichannel = true; // "channel" == track here...
}

1
libs/ardour/SConscript
View File

@ -152,7 +152,6 @@ session_time.cc
session_transport.cc
session_utils.cc
silentfilesource.cc
smf_reader.cc
smf_source.cc
sndfile_helpers.cc
sndfileimportable.cc

5
libs/ardour/ardour/midi_source.h
View File

@ -95,8 +95,9 @@ class MidiSource : public Source
void set_model(boost::shared_ptr<MidiModel> m) { _model = m; }
protected:
virtual int flush_header() = 0;
virtual int flush_footer() = 0;
virtual void flush_midi() = 0;
//virtual int flush_header() = 0;
//virtual int flush_footer() = 0;
virtual nframes_t read_unlocked (MidiRingBuffer& dst, nframes_t start, nframes_t cnt, nframes_t stamp_offset, nframes_t negative_stamp_offset) const = 0;
virtual nframes_t write_unlocked (MidiRingBuffer& dst, nframes_t cnt) = 0;

53
libs/ardour/ardour/smf_source.h
View File

@ -25,6 +25,7 @@
#include <time.h>
#include <ardour/midi_source.h>
#include <evoral/SMF.hpp>
namespace Evoral { class Event; }
@ -33,7 +34,7 @@ namespace ARDOUR {
class MidiRingBuffer;
/** Standard Midi File (Type 0) Source */
class SMFSource : public MidiSource {
class SMFSource : public MidiSource, public Evoral::SMF {
public:
enum Flag {
Writable = 0x1,
@ -67,7 +68,7 @@ class SMFSource : public MidiSource {
int set_source_name (string newname, bool destructive);
static bool safe_file_extension (const Glib::ustring& path);
Glib::ustring path() const { return _path; }
void set_allow_remove_if_empty (bool yn);
@ -75,12 +76,8 @@ class SMFSource : public MidiSource {
void append_event_unlocked(EventTimeUnit unit, const Evoral::Event& ev);
int flush_header ();
int flush_footer ();
int move_to_trash (const string trash_dir_name);
bool is_empty () const;
void mark_streaming_midi_write_started (NoteMode mode, nframes_t start_time);
void mark_streaming_write_completed ();
@ -93,56 +90,34 @@ class SMFSource : public MidiSource {
XMLNode& get_state ();
int set_state (const XMLNode&);
void seek_to(nframes_t time);
void load_model(bool lock=true, bool force_reload=false);
void destroy_model();
uint16_t ppqn() const { return _ppqn; }
void flush_midi();
private:
int init (string idstr, bool must_exist);
nframes_t read_unlocked (MidiRingBuffer& dst, nframes_t start, nframes_t cn, nframes_t stamp_offset, nframes_t negative_stamp_offset) const;
nframes_t write_unlocked (MidiRingBuffer& dst, nframes_t cnt);
nframes_t read_unlocked (
MidiRingBuffer& dst,
nframes_t start,
nframes_t cn,
nframes_t stamp_offset,
nframes_t negative_stamp_offset) const;
nframes_t write_unlocked (
MidiRingBuffer& src,
nframes_t cnt);
bool find (std::string path, bool must_exist, bool& is_new);
bool removable() const;
bool writable() const { return _flags & Writable; }
int open();
void close();
/**
* This method is only used by flush_footer() to find the right seek position
* for the footer (at the end after recording or -4 offset ro SEEK_END
* if a footer is already present)
*/
void seek_to_footer_position();
/**
* write the track footer at the current seek position
*/
void write_footer();
void write_chunk_header(const char id[4], uint32_t length);
void write_chunk(const char id[4], uint32_t length, void* data);
size_t write_var_len(uint32_t val);
uint32_t read_var_len() const;
int read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf) const;
static const uint16_t _ppqn = 19200;
Glib::ustring _path;
Flag _flags;
string _take_id;
bool _allow_remove_if_empty;
FILE* _fd;
double _last_ev_time; ///< last frame time written, relative to source start
uint32_t _track_size;
uint32_t _header_size; ///< size of SMF header, including MTrk chunk header
bool _empty; ///< true iff file contains (non-empty) events
static string _search_path;
};

15
libs/ardour/import.cc
View File

@ -37,6 +37,8 @@
#include <pbd/basename.h>
#include <pbd/convert.h>
#include <evoral/SMFReader.hpp>
#include <ardour/ardour.h>
#include <ardour/session.h>
#include <ardour/session_directory.h>
@ -50,7 +52,6 @@
#include <ardour/resampled_source.h>
#include <ardour/sndfileimportable.h>
#include <ardour/analyser.h>
#include <ardour/smf_reader.h>
#include <ardour/smf_source.h>
#include <ardour/tempo.h>
@ -302,7 +303,7 @@ write_audio_data_to_new_files (ImportableSource* source, Session::import_status&
}
static void
write_midi_data_to_new_files (SMFReader* source, Session::import_status& status,
write_midi_data_to_new_files (Evoral::SMFReader* source, Session::import_status& status,
vector<boost::shared_ptr<Source> >& newfiles)
{
Evoral::Event ev(0, 0.0, 4, NULL, true);
@ -344,9 +345,7 @@ write_midi_data_to_new_files (SMFReader* source, Session::import_status& status,
smfs->session().tempo_map().meter_at(timeline_position));
smfs->update_length(0, (nframes_t) ceil ((t / (double)source->ppqn()) * frames_per_beat));
smfs->flush_header();
smfs->flush_footer();
smfs->end_write();
if (status.cancel)
break;
@ -384,7 +383,7 @@ Session::import_audiofiles (import_status& status)
++p, ++cnt)
{
boost::shared_ptr<ImportableSource> source;
std::auto_ptr<SMFReader> smf_reader;
std::auto_ptr<Evoral::SMFReader> smf_reader;
const DataType type = ((*p).rfind(".mid") != string::npos) ?
DataType::MIDI : DataType::AUDIO;
@ -400,9 +399,9 @@ Session::import_audiofiles (import_status& status)
} else {
try {
smf_reader = std::auto_ptr<SMFReader>(new SMFReader(*p));
smf_reader = std::auto_ptr<Evoral::SMFReader>(new Evoral::SMFReader(*p));
channels = smf_reader->num_tracks();
} catch (const SMFReader::UnsupportedTime& err) {
} catch (const Evoral::SMFReader::UnsupportedTime& err) {
error << _("Import: unsupported MIDI time stamp format") << endmsg;
status.done = status.cancel = true;
return;

6
libs/ardour/midi_source.cc
View File

@ -165,8 +165,7 @@ MidiSource::mark_streaming_write_completed ()
void
MidiSource::session_saved()
{
flush_header();
flush_footer();
flush_midi();
if (_model && _model->edited()) {
string newname;
@ -197,8 +196,7 @@ MidiSource::session_saved()
newsrc->set_model(_model);
_model->set_midi_source(newsrc.get());
newsrc->flush_header();
newsrc->flush_footer();
newsrc->flush_midi();
Switched.emit(newsrc);
}

351
libs/ardour/smf_source.cc
View File

@ -32,13 +32,14 @@
#include <glibmm/miscutils.h>
#include <evoral/SMFReader.hpp>
#include <ardour/smf_source.h>
#include <ardour/session.h>
#include <ardour/midi_ring_buffer.h>
#include <ardour/midi_util.h>
#include <ardour/tempo.h>
#include <ardour/audioengine.h>
#include <ardour/smf_reader.h>
#include <ardour/event_type_map.h>
#include "i18n.h"
@ -54,13 +55,9 @@ uint64_t SMFSource::header_position_offset;
SMFSource::SMFSource (Session& s, std::string path, Flag flags)
: MidiSource (s, region_name_from_path(path, false))
, SMF ()
, _flags (Flag(flags | Writable)) // FIXME: this needs to be writable for now
, _allow_remove_if_empty(true)
, _fd (0)
, _last_ev_time(0)
, _track_size(4) // 4 bytes for the ever-present EOT event
, _header_size(22)
, _empty(true)
{
/* constructor used for new internal-to-session files. file cannot exist */
@ -68,7 +65,7 @@ SMFSource::SMFSource (Session& s, std::string path, Flag flags)
throw failed_constructor ();
}
if (open()) {
if (open(path)) {
throw failed_constructor ();
}
@ -79,11 +76,6 @@ SMFSource::SMFSource (Session& s, const XMLNode& node)
: MidiSource (s, node)
, _flags (Flag (Writable|CanRename))
, _allow_remove_if_empty(true)
, _fd (0)
, _last_ev_time(0)
, _track_size(4) // 4 bytes for the ever-present EOT event
, _header_size(22)
, _empty(true)
{
/* constructor used for existing internal-to-session files. file must exist */
@ -95,7 +87,7 @@ SMFSource::SMFSource (Session& s, const XMLNode& node)
throw failed_constructor ();
}
if (open()) {
if (open(_path)) {
throw failed_constructor ();
}
@ -134,245 +126,6 @@ SMFSource::init (string pathstr, bool must_exist)
return 0;
}
/** Attempt to open the SMF file for reading and writing.
*
* Currently SMFSource is always read/write.
*
* \return 0 on success
* -1 if the file can not be opened for reading,
* -2 if the file can not be opened for writing
*/
int
SMFSource::open()
{
//cerr << "Opening SMF file " << path() << " writeable: " << writable() << endl;
assert(writable()); // FIXME;
_fd = fopen(path().c_str(), "r+");
// File already exists
if (_fd) {
fseek(_fd, _header_size - 4, 0);
uint32_t track_size_be = 0;
fread(&track_size_be, 4, 1, _fd);
_track_size = GUINT32_FROM_BE(track_size_be);
_empty = _track_size > 4;
//cerr << "SMF - read track size " << _track_size << endl;
// We're making a new file
} else {
_fd = fopen(path().c_str(), "w+");
if (_fd == NULL) {
cerr << "ERROR: Can not open SMF file " << path() << " for writing: " <<
strerror(errno) << endl;
return -2;
}
_track_size = 4;
_empty = true;
// Write a tentative header just to pad things out so writing happens in the right spot
flush_header();
flush_footer();
}
return (_fd == 0) ? -1 : 0;
}
void
SMFSource::close()
{
if (_fd) {
flush_header();
flush_footer();
fclose(_fd);
_fd = NULL;
}
}
void
SMFSource::seek_to_footer_position()
{
uint8_t buffer[4];
// lets check if there is a track end marker at the end of the data
fseek(_fd, -4, SEEK_END);
//cerr << "SMFSource::seek_to_footer_position: At position: " << ftell(_fd);
size_t read_bytes = fread(buffer, sizeof(uint8_t), 4, _fd);
/*cerr << " read size: " << read_bytes << " buffer: ";
for (size_t i=0; i < read_bytes; ++i) {
printf("%x ", buffer[i]);
}
printf("\n");
*/
if( (read_bytes == 4) &&
buffer[0] == 0x00 &&
buffer[1] == 0xFF &&
buffer[2] == 0x2F &&
buffer[3] == 0x00) {
// there is one, so overwrite it
fseek(_fd, -4, SEEK_END);
} else {
// there is none, so append
fseek(_fd, 0, SEEK_END);
}
}
int
SMFSource::flush_header()
{
// FIXME: write timeline position somehow?
//cerr << path() << " SMF Flushing header\n";
assert(_fd);
const uint16_t type = GUINT16_TO_BE(0); // SMF Type 0 (single track)
const uint16_t ntracks = GUINT16_TO_BE(1); // Number of tracks (always 1 for Type 0)
const uint16_t division = GUINT16_TO_BE(_ppqn); // Pulses per quarter note (beat)
char data[6];
memcpy(data, &type, 2);
memcpy(data+2, &ntracks, 2);
memcpy(data+4, &division, 2);
_fd = freopen(path().c_str(), "r+", _fd);
assert(_fd);
fseek(_fd, 0, SEEK_SET);
write_chunk("MThd", 6, data);
write_chunk_header("MTrk", _track_size);
fflush(_fd);
return 0;
}
int
SMFSource::flush_footer()
{
//cerr << path() << " SMF Flushing footer\n";
seek_to_footer_position();
write_footer();
seek_to_footer_position();
return 0;
}
void
SMFSource::write_footer()
{
write_var_len(0);
char eot[3] = { 0xFF, 0x2F, 0x00 }; // end-of-track meta-event
fwrite(eot, 1, 3, _fd);
fflush(_fd);
}
/** Returns the offset of the first event in the file with a time past @a start,
* relative to the start of the source.
*
* Returns -1 if not found.
*/
/*
long
SMFSource::find_first_event_after(nframes_t start)
{
// FIXME: obviously this is slooow
fseek(_fd, _header_size, 0);
while ( ! feof(_fd) ) {
const uint32_t delta_time = read_var_len();
if (delta_time > start)
return delta_time;
}
return -1;
}
*/
/** Read an event from the current position in file.
*
* File position MUST be at the beginning of a delta time, or this will die very messily.
* ev.buffer must be of size ev.size, and large enough for the event. The returned event
* will have it's time field set to it's delta time, in SMF tempo-based ticks, using the
* rate given by ppqn() (it is the caller's responsibility to calculate a real time).
*
* \a size should be the capacity of \a buf. If it is not large enough, \a buf will
* be freed and a new buffer allocated in its place, the size of which will be placed
* in size.
*
* Returns event length (including status byte) on success, 0 if event was
* skipped (eg a meta event), or -1 on EOF (or end of track).
*/
int
SMFSource::read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf) const
{
if (feof(_fd)) {
return -1;
}
assert(delta_t);
assert(size);
assert(buf);
try {
*delta_t = SMFReader::read_var_len(_fd);
} catch (...) {
return -1; // Premature EOF
}
if (feof(_fd)) {
return -1; // Premature EOF
}
const int status = fgetc(_fd);
if (status == EOF) {
return -1; // Premature EOF
}
//printf("Status @ %X = %X\n", (unsigned)ftell(_fd) - 1, status);
if (status == 0xFF) {
if (feof(_fd)) {
return -1; // Premature EOF
}
const int type = fgetc(_fd);
if ((unsigned char)type == 0x2F) {
return -1; // hit end of track
} else {
*size = 0;
return 0;
}
}
const int event_size = midi_event_size((unsigned char)status) + 1;
if (event_size <= 0) {
*size = 0;
return 0;
}
// Make sure we have enough scratch buffer
if (*size < (unsigned)event_size)
*buf = (uint8_t*)realloc(*buf, event_size);
*size = event_size;
(*buf)[0] = (unsigned char)status;
if (event_size > 1)
fread((*buf) + 1, 1, *size - 1, _fd);
/*printf("SMFSource %s read event: delta = %u, size = %u, data = ", _name.c_str(), *delta_t, *size);
for (size_t i=0; i < *size; ++i) {
printf("%X ", (*buf)[i]);
}
printf("\n");*/
return (int)*size;
}
/** All stamps in audio frames */
nframes_t
SMFSource::read_unlocked (MidiRingBuffer& dst, nframes_t start, nframes_t cnt, nframes_t stamp_offset, nframes_t negative_stamp_offset) const
@ -393,16 +146,16 @@ SMFSource::read_unlocked (MidiRingBuffer& dst, nframes_t start, nframes_t cnt, n
size_t scratch_size = 0; // keep track of scratch to minimize reallocs
// FIXME: don't seek to start and search every read (brutal!)
fseek(_fd, _header_size, SEEK_SET);
SMF::seek_to_start();
// FIXME: assumes tempo never changes after start
const double frames_per_beat = _session.tempo_map().tempo_at(_timeline_position).frames_per_beat(
_session.engine().frame_rate(),
_session.tempo_map().meter_at(_timeline_position));
const uint64_t start_ticks = (uint64_t)((start / frames_per_beat) * _ppqn);
const uint64_t start_ticks = (uint64_t)((start / frames_per_beat) * ppqn());
while (!feof(_fd)) {
while (!SMF::eof()) {
int ret = read_event(&ev_delta_t, &ev_size, &ev_buffer);
if (ret == -1) { // EOF
//cerr << "SMF - EOF\n";
@ -420,7 +173,7 @@ SMFSource::read_unlocked (MidiRingBuffer& dst, nframes_t start, nframes_t cnt, n
if (time >= start_ticks) {
const nframes_t ev_frame_time = (nframes_t)(
((time / (double)_ppqn) * frames_per_beat)) + stamp_offset;
((time / (double)ppqn()) * frames_per_beat)) + stamp_offset;
if (ev_frame_time <= start + cnt)
dst.write(ev_frame_time - negative_stamp_offset, ev_type, ev_size, ev_buffer);
@ -493,7 +246,7 @@ SMFSource::write_unlocked (MidiRingBuffer& src, nframes_t cnt)
_model->append(ev);
}
fflush(_fd);
SMF::flush();
free(buf);
const nframes_t oldlen = _length;
@ -520,8 +273,8 @@ SMFSource::append_event_unlocked(EventTimeUnit unit, const Evoral::Event& ev)
assert(ev.time() >= 0);
if (ev.time() < _last_ev_time) {
cerr << "SMFSource: Warning: Skipping event with ev.time() < _last_ev_time" << endl;
if (ev.time() < last_event_time()) {
cerr << "SMFSource: Warning: Skipping event with ev.time() < last.time()" << endl;
return;
}
@ -533,22 +286,15 @@ SMFSource::append_event_unlocked(EventTimeUnit unit, const Evoral::Event& ev)
_session.engine().frame_rate(),
_session.tempo_map().meter_at(_timeline_position));
delta_time = (uint32_t)((ev.time() - _last_ev_time) / frames_per_beat * _ppqn);
delta_time = (uint32_t)((ev.time() - last_event_time()) / frames_per_beat * ppqn());
} else {
assert(unit == Beats);
delta_time = (uint32_t)((ev.time() - _last_ev_time) * _ppqn);
delta_time = (uint32_t)((ev.time() - last_event_time()) * ppqn());
}
const size_t stamp_size = write_var_len(delta_time);
fwrite(ev.buffer(), 1, ev.size(), _fd);
SMF::append_event_unlocked(delta_time, ev);
_track_size += stamp_size + ev.size();
_write_data_count += ev.size();
_last_ev_time = ev.time();
if (ev.size() > 0)
_empty = false;
}
@ -601,8 +347,7 @@ void
SMFSource::mark_streaming_midi_write_started (NoteMode mode, nframes_t start_frame)
{
MidiSource::mark_streaming_midi_write_started (mode, start_frame);
_last_ev_time = 0;
fseek(_fd, _header_size, SEEK_SET);
SMF::begin_write (start_frame);
}
void
@ -615,8 +360,7 @@ SMFSource::mark_streaming_write_completed ()
}
_model->set_edited(false);
flush_header();
flush_footer();
SMF::end_write ();
}
void
@ -855,56 +599,6 @@ SMFSource::set_source_name (string newname, bool destructive)
return 0;//rename_peakfile (peak_path (_path));
}
bool
SMFSource::is_empty () const
{
return _empty;
}
void
SMFSource::write_chunk_header(const char id[4], uint32_t length)
{
const uint32_t length_be = GUINT32_TO_BE(length);
fwrite(id, 1, 4, _fd);
fwrite(&length_be, 4, 1, _fd);
}
void
SMFSource::write_chunk(const char id[4], uint32_t length, void* data)
{
write_chunk_header(id, length);
fwrite(data, 1, length, _fd);
}
/** Returns the size (in bytes) of the value written. */
size_t
SMFSource::write_var_len(uint32_t value)
{
size_t ret = 0;
uint32_t buffer = value & 0x7F;
while ( (value >>= 7) ) {
buffer <<= 8;
buffer |= ((value & 0x7F) | 0x80);
}
while (true) {
//printf("Writing var len byte %X\n", (unsigned char)buffer);
++ret;
fputc(buffer, _fd);
if (buffer & 0x80)
buffer >>= 8;
else
break;
}
return ret;
}
void
SMFSource::load_model(bool lock, bool force_reload)
{
@ -927,8 +621,7 @@ SMFSource::load_model(bool lock, bool force_reload)
}
_model->start_write();
fseek(_fd, _header_size, SEEK_SET);
SMF::seek_to_start();
uint64_t time = 0; /* in SMF ticks */
Evoral::Event ev;
@ -951,7 +644,7 @@ SMFSource::load_model(bool lock, bool force_reload)
if (ret > 0) { // didn't skip (meta) event
// make ev.time absolute time in frames
ev.time() = time * frames_per_beat / (EventTime)_ppqn;
ev.time() = time * frames_per_beat / (EventTime)ppqn();
ev.set_event_type(EventTypeMap::instance().midi_event_type(buf[0]));
_model->append(ev);
}
@ -976,3 +669,9 @@ SMFSource::destroy_model()
_model.reset();
}
void
SMFSource::flush_midi()
{
SMF::end_write();
}

2
libs/evoral/SConscript
View File

@ -31,6 +31,8 @@ src/Curve.cpp
src/Event.cpp
src/MIDIEvent.cpp
src/Note.cpp
src/SMF.cpp
src/SMFReader.cpp
src/Sequence.cpp
""")

83
libs/evoral/evoral/SMF.hpp Normal file
View File

@ -0,0 +1,83 @@
/* This file is part of Evoral.
* Copyright(C) 2008 Dave Robillard <http://drobilla.net>
* Copyright(C) 2000-2008 Paul Davis
*
* Evoral 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 of the License, or(at your option) any later
* version.
*
* Evoral 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 details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef EVORAL_SMF_HPP
#define EVORAL_SMF_HPP
#include <string>
#include <evoral/types.hpp>
namespace Evoral {
class Event;
class EventRingBuffer;
/** Standard Midi File (Type 0)
*/
class SMF {
public:
SMF();
virtual ~SMF();
void seek_to_start() const;
uint16_t ppqn() const { return _ppqn; }
bool is_empty() const { return _empty; }
bool eof() const { return feof(_fd); }
EventTime last_event_time() const { return _last_ev_time; }
void begin_write(nframes_t start_time);
void append_event_unlocked(uint32_t delta_t, const Evoral::Event& ev);
void end_write();
void flush();
int flush_header();
int flush_footer();
protected:
int open(const std::string& path);
void close();
/** Used by flush_footer() to find the position to write the footer */
void seek_to_footer_position();
/** Write the track footer at the current seek position */
void write_footer();
void write_chunk_header(const char id[4], uint32_t length);
void write_chunk(const char id[4], uint32_t length, void* data);
size_t write_var_len(uint32_t val);
uint32_t read_var_len() const;
int read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf) const;
private:
static const uint16_t _ppqn = 19200;
FILE* _fd;
EventTime _last_ev_time; ///< last frame time written, relative to source start
uint32_t _track_size;
uint32_t _header_size; ///< size of SMF header, including MTrk chunk header
bool _empty; ///< true iff file contains(non-empty) events
};
}; /* namespace Evoral */
#endif /* EVORAL_SMF_HPP */

47
libs/ardour/ardour/smf_reader.h → libs/evoral/evoral/SMFReader.hpp
View File

@ -1,31 +1,30 @@
/*
Copyright (C) 2008 Paul Davis
Written by Dave Robillard
/* This file is part of Evoral.
* Copyright(C) 2008 Dave Robillard <http://drobilla.net>
* Copyright(C) 2000-2008 Paul Davis
*
* Evoral 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 of the License, or(at your option) any later
* version.
*
* Evoral 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 details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
This program 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 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __ardour_smf_reader_h__
#define __ardour_smf_reader_h__
#ifndef EVORAL_SMF_READER_HPP
#define EVORAL_SMF_READER_HPP
#include <exception>
#include <stdexcept>
#include <string>
#include <inttypes.h>
namespace ARDOUR {
namespace Evoral {
/** Standard MIDI File (Type 0) Reader
@ -44,7 +43,7 @@ public:
const char* what() const throw() { return "Unsupported time stamp type (SMPTE)"; }
};
SMFReader(const std::string filename="");
SMFReader(const std::string& filename="");
~SMFReader();
bool open(const std::string& filename) throw (std::logic_error, UnsupportedTime);
@ -81,7 +80,7 @@ protected:
};
} // namespace ARDOUR
} // namespace Evoral
#endif /* __ardour_smf_reader_h__ */
#endif // EVORAL_SMF_READER_HPP

362
libs/evoral/src/SMF.cpp Normal file
View File

@ -0,0 +1,362 @@
/* This file is part of Evoral.
* Copyright (C) 2008 Dave Robillard <http://drobilla.net>
* Copyright (C) 2000-2008 Paul Davis
*
* Evoral 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 of the License, or (at your option) any later
* version.
*
* Evoral 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 details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <cassert>
#include <iostream>
#include <glibmm/miscutils.h>
#include <evoral/midi_util.h>
#include <evoral/SMF.hpp>
#include <evoral/SMFReader.hpp>
#include <evoral/Event.hpp>
using namespace std;
namespace Evoral {
SMF::SMF()
: _fd(0)
, _last_ev_time(0)
, _track_size(4) // 4 bytes for the ever-present EOT event
, _header_size(22)
, _empty(true)
{
}
SMF::~SMF()
{
}
/** Attempt to open the SMF file for reading and writing.
*
* Currently SMF is always read/write.
*
* \return 0 on success
* -1 if the file can not be opened for reading,
* -2 if the file can not be opened for writing
*/
int
SMF::open(const std::string& path)
{
//cerr << "Opening SMF file " << path() << " writeable: " << writable() << endl;
_fd = fopen(path.c_str(), "r+");
// File already exists
if (_fd) {
fseek(_fd, _header_size - 4, 0);
uint32_t track_size_be = 0;
fread(&track_size_be, 4, 1, _fd);
_track_size = GUINT32_FROM_BE(track_size_be);
_empty = _track_size > 4;
//cerr << "SMF - read track size " << _track_size << endl;
// We're making a new file
} else {
_fd = fopen(path.c_str(), "w+");
if (_fd == NULL) {
cerr << "ERROR: Can not open SMF file " << path << " for writing: " <<
strerror(errno) << endl;
return -2;
}
_track_size = 4;
_empty = true;
// Write a tentative header just to pad things out so writing happens in the right spot
flush_header();
flush_footer();
}
return (_fd == 0) ? -1 : 0;
}
void
SMF::close()
{
if (_fd) {
flush_header();
flush_footer();
fclose(_fd);
_fd = NULL;
}
}
void
SMF::seek_to_start() const
{
fseek(_fd, _header_size, SEEK_SET);
}
void
SMF::seek_to_footer_position()
{
uint8_t buffer[4];
// Check if there is a track end marker at the end of the data
fseek(_fd, -4, SEEK_END);
size_t read_bytes = fread(buffer, sizeof(uint8_t), 4, _fd);
if ((read_bytes == 4)
&& buffer[0] == 0x00
&& buffer[1] == 0xFF
&& buffer[2] == 0x2F
&& buffer[3] == 0x00) {
// there is one, so overwrite it
fseek(_fd, -4, SEEK_END);
} else {
// there is none, so append
fseek(_fd, 0, SEEK_END);
}
}
void
SMF::flush()
{
fflush(_fd);
}
int
SMF::flush_header()
{
// FIXME: write timeline position somehow?
//cerr << path() << " SMF Flushing header\n";
assert(_fd);
const uint16_t type = GUINT16_TO_BE(0); // SMF Type 0 (single track)
const uint16_t ntracks = GUINT16_TO_BE(1); // Number of tracks (always 1 for Type 0)
const uint16_t division = GUINT16_TO_BE(_ppqn); // Pulses per quarter note (beat)
char data[6];
memcpy(data, &type, 2);
memcpy(data+2, &ntracks, 2);
memcpy(data+4, &division, 2);
//_fd = freopen(path().c_str(), "r+", _fd);
//assert(_fd);
fseek(_fd, 0, SEEK_SET);
write_chunk("MThd", 6, data);
write_chunk_header("MTrk", _track_size);
fflush(_fd);
return 0;
}
int
SMF::flush_footer()
{
//cerr << path() << " SMF Flushing footer\n";
seek_to_footer_position();
write_footer();
seek_to_footer_position();
return 0;
}
void
SMF::write_footer()
{
write_var_len(0);
char eot[3] = { 0xFF, 0x2F, 0x00 }; // end-of-track meta-event
fwrite(eot, 1, 3, _fd);
fflush(_fd);
}
/** Returns the offset of the first event in the file with a time past @a start,
* relative to the start of the source.
*
* Returns -1 if not found.
*/
/*
long
SMF::find_first_event_after(nframes_t start)
{
// FIXME: obviously this is slooow
fseek(_fd, _header_size, 0);
while ( ! feof(_fd) ) {
const uint32_t delta_time = read_var_len();
if (delta_time > start)
return delta_time;
}
return -1;
}
*/
/** Read an event from the current position in file.
*
* File position MUST be at the beginning of a delta time, or this will die very messily.
* ev.buffer must be of size ev.size, and large enough for the event. The returned event
* will have it's time field set to it's delta time, in SMF tempo-based ticks, using the
* rate given by ppqn() (it is the caller's responsibility to calculate a real time).
*
* \a size should be the capacity of \a buf. If it is not large enough, \a buf will
* be freed and a new buffer allocated in its place, the size of which will be placed
* in size.
*
* Returns event length (including status byte) on success, 0 if event was
* skipped (eg a meta event), or -1 on EOF (or end of track).
*/
int
SMF::read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf) const
{
if (feof(_fd)) {
return -1;
}
assert(delta_t);
assert(size);
assert(buf);
try {
*delta_t = SMFReader::read_var_len(_fd);
} catch (...) {
return -1; // Premature EOF
}
if (feof(_fd)) {
return -1; // Premature EOF
}
const int status = fgetc(_fd);
if (status == EOF) {
return -1; // Premature EOF
}
//printf("Status @ %X = %X\n", (unsigned)ftell(_fd) - 1, status);
if (status == 0xFF) {
if (feof(_fd)) {
return -1; // Premature EOF
}
const int type = fgetc(_fd);
if ((unsigned char)type == 0x2F) {
return -1; // hit end of track
} else {
*size = 0;
return 0;
}
}
const int event_size = midi_event_size((unsigned char)status) + 1;
if (event_size <= 0) {
*size = 0;
return 0;
}
// Make sure we have enough scratch buffer
if (*size < (unsigned)event_size)
*buf = (uint8_t*)realloc(*buf, event_size);
*size = event_size;
(*buf)[0] = (unsigned char)status;
if (event_size > 1)
fread((*buf) + 1, 1, *size - 1, _fd);
/*printf("SMF %s read event: delta = %u, size = %u, data = ", _name.c_str(), *delta_t, *size);
for (size_t i=0; i < *size; ++i) {
printf("%X ", (*buf)[i]);
}
printf("\n");*/
return (int)*size;
}
void
SMF::append_event_unlocked(uint32_t delta_t, const Evoral::Event& ev)
{
if (ev.size() == 0)
return;
const size_t stamp_size = write_var_len(delta_t);
fwrite(ev.buffer(), 1, ev.size(), _fd);
_track_size += stamp_size + ev.size();
_last_ev_time = ev.time();
if (ev.size() > 0)
_empty = false;
}
void
SMF::begin_write(nframes_t start_frame)
{
_last_ev_time = 0;
fseek(_fd, _header_size, SEEK_SET);
}
void
SMF::end_write()
{
flush_header();
flush_footer();
}
void
SMF::write_chunk_header(const char id[4], uint32_t length)
{
const uint32_t length_be = GUINT32_TO_BE(length);
fwrite(id, 1, 4, _fd);
fwrite(&length_be, 4, 1, _fd);
}
void
SMF::write_chunk(const char id[4], uint32_t length, void* data)
{
write_chunk_header(id, length);
fwrite(data, 1, length, _fd);
}
/** Returns the size (in bytes) of the value written. */
size_t
SMF::write_var_len(uint32_t value)
{
size_t ret = 0;
uint32_t buffer = value & 0x7F;
while ( (value >>= 7) ) {
buffer <<= 8;
buffer |= ((value & 0x7F) | 0x80);
}
while (true) {
//printf("Writing var len byte %X\n", (unsigned char)buffer);
++ret;
fputc(buffer, _fd);
if (buffer & 0x80)
buffer >>= 8;
else
break;
}
return ret;
}
} // namespace Evoral

46
libs/ardour/smf_reader.cc → libs/evoral/src/SMFReader.cpp
View File

@ -1,38 +1,36 @@
/*
Copyright (C) 2008 Paul Davis
Written by Dave Robillard
This program 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 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* This file is part of Evoral.
* Copyright(C) 2008 Dave Robillard <http://drobilla.net>
* Copyright(C) 2000-2008 Paul Davis
*
* Evoral 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 of the License, or(at your option) any later
* version.
*
* Evoral 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 details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <cstring>
#include <cstdio>
#include <cassert>
#include <iostream>
#include <glibmm/miscutils.h>
#include <midi++/events.h>
#include <ardour/smf_reader.h>
#include <ardour/midi_util.h>
#include <evoral/midi_util.h>
#include <evoral/SMFReader.hpp>
using namespace std;
namespace ARDOUR {
namespace Evoral {
SMFReader::SMFReader(const string filename)
SMFReader::SMFReader(const string& filename)
: _fd(NULL)
, _ppqn(0)
, _track(0)
@ -281,5 +279,5 @@ SMFReader::read_var_len(FILE* fd) throw (PrematureEOF)
}
} // namespace ARDOUR
} // namespace Evoral