Allow to scan midi file during file read
This partially revertseced764480
. In many places Ardour uses SMF directly, without loading the MIDI model in a libardour SMFSource. In this case no information (track, channel-count) was available, aftereced764480
, and worse various members were not initialized and showed random numbers. This fixes various import options.
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7428f13e15
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0457646387
@ -46,6 +46,9 @@ SMF::SMF()
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: _smf (0)
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, _smf_track (0)
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, _empty (true)
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, _n_note_on_events (0)
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, _has_pgm_change (false)
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, _num_channels (0)
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{};
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SMF::~SMF()
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@ -121,10 +124,15 @@ SMF::test(const std::string& path)
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* -2 if the file exists but specified track does not exist
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*/
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int
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SMF::open(const std::string& path, int track)
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SMF::open(const std::string& path, int track, bool scan)
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{
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Glib::Threads::Mutex::Lock lm (_smf_lock);
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_num_channels = 0;
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_n_note_on_events = 0;
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_has_pgm_change = false;
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_used_channels.reset ();
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assert(track >= 1);
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if (_smf) {
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smf_delete(_smf);
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@ -153,6 +161,51 @@ SMF::open(const std::string& path, int track)
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fclose(f);
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lm.release ();
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if (!_empty && scan) {
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/* scan the file, set meta-data w/o loading the model */
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bool type0 = _smf->format==0;
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for (int i = 1; i <= _smf->number_of_tracks; ++i) {
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/* scan file for used channels. */
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int ret;
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uint32_t delta_t = 0;
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uint32_t size = 0;
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uint8_t* buf = NULL;
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event_id_t event_id = 0;
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if (type0) {
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seek_to_start (); //type0 files have no 'track' concept, just seek_to_start
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} else {
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seek_to_track (i);
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}
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while ((ret = read_event (&delta_t, &size, &buf, &event_id)) >= 0) {
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if (ret == 0) {
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continue;
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}
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if (size == 0) {
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break;
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}
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uint8_t type = buf[0] & 0xf0;
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uint8_t chan = buf[0] & 0x0f;
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if (type >= 0x80 && type <= 0xE0) {
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_used_channels.set(chan);
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switch (type) {
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case MIDI_CMD_NOTE_ON:
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++_n_note_on_events;
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break;
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case MIDI_CMD_PGM_CHANGE:
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_has_pgm_change = true;
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break;
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default:
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break;
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}
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}
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}
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_num_channels += _used_channels.count ();
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free (buf);
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}
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}
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if (!_empty) {
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seek_to_start();
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}
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@ -64,7 +64,7 @@ public:
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virtual ~SMF();
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static bool test(const std::string& path);
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int open(const std::string& path, int track=1);
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int open (const std::string& path, int track = 1, bool scan = true);
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// XXX 19200 = 10 * Temporal::ticks_per_beat
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int create(const std::string& path, int track=1, uint16_t ppqn=19200);
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void close();
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@ -136,21 +136,20 @@ public:
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Markers const & markers() const { return _markers; }
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void load_markers ();
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protected:
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uint64_t _n_note_on_events;
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bool _has_pgm_change;
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int _num_channels;
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UsedChannels _used_channels;
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private:
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smf_t* _smf;
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smf_track_t* _smf_track;
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bool _empty; ///< true iff file contains(non-empty) events
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mutable Glib::Threads::Mutex _smf_lock;
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mutable Markers _markers;
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protected:
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uint64_t _n_note_on_events;
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bool _has_pgm_change;
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int _num_channels;
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UsedChannels _used_channels;
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};
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}; /* namespace Evoral */
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