mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2025-02-17 11:45:25 +00:00
midiparse: Update duration
Rework things a bit so that we can run over the midi events and fire callbacks for each of them. We can then use that for calculating the duration and also for doing playback. Only parse as many tracks as specified in the header. Fix default tempo; Send MIDI tick events every 10ms
This commit is contained in:
Wim Taymans
parent
76080b78af
commit
5492631d84
2 changed files with 318 additions and 189 deletions
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@ -60,6 +60,8 @@ enum
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/* FILL ME */
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};
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#define DEFAULT_TEMPO 500000 /* 120 BPM is the default */
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typedef struct
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{
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guint8 *data;
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@ -67,10 +69,22 @@ typedef struct
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guint offset;
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guint8 running_status;
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GstClockTime position;
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guint64 pulse;
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gboolean eot;
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} GstMidiTrack;
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typedef struct
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{
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GstFlowReturn (*handle_sysex) (GstMidiParse * parse, GstMidiTrack * track,
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guint8 event, guint8 * data, guint length, gpointer user_data);
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GstFlowReturn (*handle_meta) (GstMidiParse * parse, GstMidiTrack * track,
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guint8 event, guint8 type, guint8 * data,
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guint length, gpointer user_data);
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GstFlowReturn (*handle_midi) (GstMidiParse * parse,
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guint8 event, guint8 * data, guint length, gpointer user_data);
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} GstMidiCallbacks;
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static void gst_midi_parse_finalize (GObject * object);
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static gboolean gst_midi_parse_sink_event (GstPad * pad, GstObject * parent,
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@ -360,6 +374,129 @@ parse_varlen (GstMidiParse * midiparse, guint8 * data, guint size,
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return 0;
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}
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static GstFlowReturn
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handle_meta_event (GstMidiParse * midiparse, GstMidiTrack * track,
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guint8 event, GstMidiCallbacks * callback, gpointer user_data)
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{
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GstFlowReturn ret;
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guint8 type;
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guint8 *data;
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guint size, consumed;
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gint32 length;
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track->offset += 1;
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data = track->data + track->offset;
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size = track->size - track->offset;
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if (size < 1)
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goto short_file;
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type = data[0];
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consumed = parse_varlen (midiparse, data + 1, size - 1, &length);
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if (consumed == 0)
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goto short_file;
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data += consumed + 1;
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size -= consumed + 1;
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if (size < length)
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goto short_file;
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GST_DEBUG_OBJECT (midiparse, "handle meta event type 0x%02x, length %u",
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type, length);
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if (callback->handle_meta)
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ret = callback->handle_meta (midiparse, track, event, type,
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data, length, user_data);
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else
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ret = GST_FLOW_OK;
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switch (type) {
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case 0x51:
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{
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guint32 uspqn = (data[0] << 16) | (data[1] << 8) | data[2];
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midiparse->tempo = (uspqn ? uspqn : DEFAULT_TEMPO);
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GST_DEBUG_OBJECT (midiparse, "tempo %u", midiparse->tempo);
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break;
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}
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default:
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break;
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}
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track->offset += consumed + length + 1;
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return ret;
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/* ERRORS */
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short_file:
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{
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GST_DEBUG_OBJECT (midiparse, "not enough data");
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return GST_FLOW_ERROR;
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}
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}
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static GstFlowReturn
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handle_sysex_event (GstMidiParse * midiparse, GstMidiTrack * track,
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guint8 event, GstMidiCallbacks * callback, gpointer user_data)
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{
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GstFlowReturn ret;
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guint8 *data;
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guint size, consumed;
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gint32 length;
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track->offset += 1;
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data = track->data + track->offset;
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size = track->size - track->offset;
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consumed = parse_varlen (midiparse, data, size, &length);
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if (consumed == 0)
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goto short_file;
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data += consumed;
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size -= consumed;
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if (size < length)
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goto short_file;
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GST_DEBUG_OBJECT (midiparse, "handle sysex event 0x%02x, length %u",
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event, length);
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if (callback->handle_sysex)
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ret = callback->handle_sysex (midiparse, track, event,
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data, length, user_data);
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else
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ret = GST_FLOW_OK;
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track->offset += consumed + length;
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return ret;
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/* ERRORS */
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short_file:
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{
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GST_DEBUG_OBJECT (midiparse, "not enough data");
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return GST_FLOW_ERROR;
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}
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}
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static guint8
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event_from_status (GstMidiParse * midiparse, GstMidiTrack * track,
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guint8 status)
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{
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if ((status & 0x80) == 0) {
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if ((track->running_status & 0x80) == 0)
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return 0;
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return track->running_status;
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} else {
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return status;
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}
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}
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static gboolean
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update_track_position (GstMidiParse * midiparse, GstMidiTrack * track)
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{
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@ -377,11 +514,11 @@ update_track_position (GstMidiParse * midiparse, GstMidiTrack * track)
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if (consumed == 0)
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goto eot;
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track->position += delta_time;
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track->pulse += delta_time;
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track->offset += consumed;
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GST_LOG_OBJECT (midiparse, "updated track to %" GST_TIME_FORMAT,
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GST_TIME_ARGS (track->position));
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GST_LOG_OBJECT (midiparse, "updated track to pulse %" G_GUINT64_FORMAT,
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track->pulse);
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return TRUE;
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@ -389,25 +526,136 @@ update_track_position (GstMidiParse * midiparse, GstMidiTrack * track)
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eot:
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{
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GST_DEBUG_OBJECT (midiparse, "track ended");
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track->position = GST_CLOCK_TIME_NONE;
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track->eot = TRUE;
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return FALSE;
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}
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}
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static GstFlowReturn
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handle_next_event (GstMidiParse * midiparse, GstMidiTrack * track,
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GstMidiCallbacks * callback, gpointer user_data)
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{
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GstFlowReturn ret = GST_FLOW_OK;
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guint8 status, event;
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guint length;
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guint8 *data;
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data = &track->data[track->offset];
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status = data[0];
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event = event_from_status (midiparse, track, status);
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GST_LOG_OBJECT (midiparse, "track %p, status 0x%02x, event 0x%02x", track,
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status, event);
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switch (event & 0xf0) {
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case 0xf0:
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switch (event) {
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case 0xff:
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ret =
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handle_meta_event (midiparse, track, event, callback, user_data);
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break;
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case 0xf0:
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case 0xf7:
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ret =
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handle_sysex_event (midiparse, track, event, callback, user_data);
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break;
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default:
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goto unhandled_event;
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}
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length = 0;
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break;
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case 0xc0:
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case 0xd0:
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length = 1;
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break;
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case 0x80:
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case 0x90:
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case 0xa0:
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case 0xb0:
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case 0xe0:
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length = 2;
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break;
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default:
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goto undefined_status;
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}
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if (length > 0) {
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if (status & 0x80) {
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if (callback->handle_midi)
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ret = callback->handle_midi (midiparse, event,
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data + 1, length, user_data);
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track->offset += length + 1;
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} else {
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if (callback->handle_midi)
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ret = callback->handle_midi (midiparse, event,
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data, length + 1, user_data);
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track->offset += length;
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}
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}
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if (ret == GST_FLOW_OK) {
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if (event < 0xF8)
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track->running_status = event;
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update_track_position (midiparse, track);
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}
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return ret;
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/* ERRORS */
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undefined_status:
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{
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GST_ERROR_OBJECT (midiparse, "Undefined status and invalid running status");
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return GST_FLOW_ERROR;
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}
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unhandled_event:
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{
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/* we don't know the size so we can't continue parsing */
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GST_ERROR_OBJECT (midiparse, "unhandled event 0x%08x", event);
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return GST_FLOW_ERROR;
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}
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}
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static void
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reset_track (GstMidiParse * midiparse, GstMidiTrack * track)
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{
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GST_DEBUG_OBJECT (midiparse, "reset track");
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track->offset = 0;
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track->pulse = 0;
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track->eot = FALSE;
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track->running_status = 0xff;
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update_track_position (midiparse, track);
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}
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static gboolean
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parse_MTrk (GstMidiParse * midiparse, guint8 * data, guint size)
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{
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GstMidiTrack *track;
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GstMidiCallbacks cb = { NULL, NULL, NULL };
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/* ignore excess tracks */
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if (midiparse->track_count >= midiparse->ntracks)
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return TRUE;
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track = g_slice_new (GstMidiTrack);
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track->data = data;
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track->size = size;
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track->offset = 0;
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track->position = 0;
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track->running_status = 0xff;
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update_track_position (midiparse, track);
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reset_track (midiparse, track);
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midiparse->tracks = g_list_append (midiparse->tracks, track);
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midiparse->track_count++;
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/* now loop over all events and calculate the duration */
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while (!track->eot) {
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handle_next_event (midiparse, track, &cb, NULL);
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}
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midiparse->segment.duration = gst_util_uint64_scale (track->pulse,
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1000 * midiparse->tempo, midiparse->division);
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GST_DEBUG_OBJECT (midiparse, "duration %" GST_TIME_FORMAT,
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GST_TIME_ARGS (midiparse->segment.duration));
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reset_track (midiparse, track);
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return TRUE;
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}
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@ -547,10 +795,13 @@ gst_midi_parse_parse_song (GstMidiParse * midiparse)
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GST_DEBUG_OBJECT (midiparse, "Parsing song");
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gst_segment_init (&midiparse->segment, GST_FORMAT_TIME);
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midiparse->pulse = 0;
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size = gst_adapter_available (midiparse->adapter);
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data = gst_adapter_take (midiparse->adapter, size);
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midiparse->tempo = 60;
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midiparse->tempo = DEFAULT_TEMPO;
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if (!find_midi_chunk (midiparse, data, size, &offset, &length))
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goto invalid_format;
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@ -570,8 +821,6 @@ gst_midi_parse_parse_song (GstMidiParse * midiparse)
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gst_pad_set_caps (midiparse->srcpad, outcaps);
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gst_caps_unref (outcaps);
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gst_segment_init (&midiparse->segment, GST_FORMAT_TIME);
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gst_pad_push_event (midiparse->srcpad,
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gst_event_new_segment (&midiparse->segment));
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@ -595,181 +844,29 @@ invalid_format:
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}
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static GstFlowReturn
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handle_meta_event (GstMidiParse * midiparse, GstMidiTrack * track)
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handle_play_midi (GstMidiParse * midiparse,
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guint8 event, guint8 * data, guint length, gpointer user_data)
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{
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guint8 type;
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guint8 *data;
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guint size, consumed;
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gint32 length;
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GstBuffer *outbuf;
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GstMapInfo info;
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GstClockTime position;
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track->offset += 1;
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outbuf = gst_buffer_new_allocate (NULL, length + 1, NULL);
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data = track->data + track->offset;
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size = track->size - track->offset;
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gst_buffer_map (outbuf, &info, GST_MAP_WRITE);
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info.data[0] = event;
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if (length)
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memcpy (&info.data[1], data, length);
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gst_buffer_unmap (outbuf, &info);
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if (size < 1)
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goto short_file;
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position = midiparse->segment.position;
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GST_BUFFER_PTS (outbuf) = position;
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GST_BUFFER_DTS (outbuf) = position;
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type = data[0];
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GST_DEBUG_OBJECT (midiparse, "pushing %" GST_TIME_FORMAT,
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GST_TIME_ARGS (position));
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consumed = parse_varlen (midiparse, data + 1, size - 1, &length);
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if (consumed == 0)
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goto short_file;
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data += consumed + 1;
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size -= consumed + 1;
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GST_DEBUG_OBJECT (midiparse, "handle meta event type 0x%02x, length %u",
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type, length);
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switch (type) {
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case 0x51:
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{
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guint32 uspqn = (data[0] << 16) | (data[1] << 8) | data[2];
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midiparse->tempo = (uspqn ? uspqn : 1);
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GST_DEBUG_OBJECT (midiparse, "tempo %u", midiparse->tempo);
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break;
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}
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default:
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break;
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}
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track->offset += consumed + length + 1;
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return GST_FLOW_OK;
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/* ERRORS */
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short_file:
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{
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GST_DEBUG_OBJECT (midiparse, "not enough data");
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return GST_FLOW_ERROR;
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}
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}
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static GstFlowReturn
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handle_sysex_event (GstMidiParse * midiparse, guint8 event,
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GstMidiTrack * track)
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{
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guint8 *data;
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guint size, consumed;
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gint32 length;
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track->offset += 1;
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data = track->data + track->offset;
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size = track->size - track->offset;
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consumed = parse_varlen (midiparse, data, size, &length);
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if (consumed == 0)
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goto short_file;
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data += consumed;
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size -= consumed;
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GST_DEBUG_OBJECT (midiparse, "handle sysex event 0x%02x, length %u",
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event, length);
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track->offset += consumed + length;
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return GST_FLOW_OK;
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/* ERRORS */
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short_file:
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{
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GST_DEBUG_OBJECT (midiparse, "not enough data");
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return GST_FLOW_ERROR;
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}
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}
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static GstFlowReturn
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handle_next_event (GstMidiParse * midiparse, GstMidiTrack * track)
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{
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GstFlowReturn ret = GST_FLOW_OK;
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guint8 status, event;
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guint length;
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guint8 *data;
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data = &track->data[track->offset];
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status = data[0];
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GST_LOG_OBJECT (midiparse, "track %p, status 0x%02x", track, status);
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if ((status & 0x80) == 0) {
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if ((track->running_status & 0x80) == 0)
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goto undefined_status;
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event = track->running_status;
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} else {
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event = status;
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}
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switch (event & 0xf0) {
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case 0xf0:
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switch (event) {
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case 0xff:
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ret = handle_meta_event (midiparse, track);
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break;
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case 0xf0:
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case 0xf7:
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ret = handle_sysex_event (midiparse, event, track);
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break;
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default:
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GST_ERROR_OBJECT (midiparse, "unhandled event 0x%08x", event);
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return GST_FLOW_ERROR;
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}
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length = 0;
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break;
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case 0xc0:
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case 0xd0:
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length = 1;
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break;
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default:
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length = 2;
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break;
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}
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if (length > 0) {
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GstBuffer *outbuf;
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GstMapInfo info;
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outbuf = gst_buffer_new_allocate (NULL, length + 1, NULL);
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gst_buffer_map (outbuf, &info, GST_MAP_WRITE);
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info.data[0] = event;
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if (status & 0x80) {
|
||||
memcpy (&info.data[1], &data[1], length);
|
||||
track->offset += length + 1;
|
||||
} else {
|
||||
info.data[1] = status;
|
||||
memcpy (&info.data[2], &data[1], length - 1);
|
||||
track->offset += length;
|
||||
}
|
||||
gst_buffer_unmap (outbuf, &info);
|
||||
|
||||
GST_BUFFER_PTS (outbuf) = gst_util_uint64_scale (track->position,
|
||||
1000 * midiparse->tempo, midiparse->division);
|
||||
GST_BUFFER_DTS (outbuf) = GST_BUFFER_PTS (outbuf);
|
||||
|
||||
GST_DEBUG_OBJECT (midiparse, "pushing %" GST_TIME_FORMAT,
|
||||
GST_TIME_ARGS (GST_BUFFER_PTS (outbuf)));
|
||||
|
||||
ret = gst_pad_push (midiparse->srcpad, outbuf);
|
||||
}
|
||||
|
||||
if (event < 0xF8)
|
||||
track->running_status = event;
|
||||
|
||||
return ret;
|
||||
|
||||
/* ERRORS */
|
||||
undefined_status:
|
||||
{
|
||||
GST_ERROR_OBJECT (midiparse, "Undefined status and invalid running status");
|
||||
return GST_FLOW_ERROR;
|
||||
}
|
||||
return gst_pad_push (midiparse->srcpad, outbuf);
|
||||
}
|
||||
|
||||
static GstFlowReturn
|
||||
|
|
@ -777,28 +874,58 @@ gst_midi_parse_do_play (GstMidiParse * midiparse)
|
|||
{
|
||||
GstFlowReturn res = GST_FLOW_OK;
|
||||
GList *walk;
|
||||
guint64 position, next_position = GST_CLOCK_TIME_NONE;
|
||||
guint64 pulse, next_pulse = G_MAXUINT64;
|
||||
GstClockTime position, next_position;
|
||||
GstMidiCallbacks cb = { NULL, NULL, handle_play_midi };
|
||||
guint64 tick;
|
||||
|
||||
pulse = midiparse->pulse;
|
||||
position = midiparse->segment.position;
|
||||
|
||||
GST_DEBUG_OBJECT (midiparse, "pulse %" G_GUINT64_FORMAT ", position %"
|
||||
GST_TIME_FORMAT, pulse, GST_TIME_ARGS (position));
|
||||
|
||||
for (walk = midiparse->tracks; walk; walk = g_list_next (walk)) {
|
||||
GstMidiTrack *track = walk->data;
|
||||
|
||||
while (track->position == position) {
|
||||
res = handle_next_event (midiparse, track);
|
||||
while (!track->eot && track->pulse == pulse) {
|
||||
res = handle_next_event (midiparse, track, &cb, NULL);
|
||||
if (res != GST_FLOW_OK)
|
||||
goto done;
|
||||
|
||||
update_track_position (midiparse, track);
|
||||
}
|
||||
|
||||
if (track->position < next_position)
|
||||
next_position = track->position;
|
||||
if (!track->eot && track->pulse < next_pulse)
|
||||
next_pulse = track->pulse;
|
||||
}
|
||||
|
||||
if (next_position == GST_CLOCK_TIME_NONE)
|
||||
if (next_pulse == G_MAXUINT64)
|
||||
goto eos;
|
||||
|
||||
tick = position / (10 * GST_MSECOND);
|
||||
GST_DEBUG_OBJECT (midiparse, "current tick %" G_GUINT64_FORMAT, tick);
|
||||
|
||||
next_position = gst_util_uint64_scale (next_pulse,
|
||||
1000 * midiparse->tempo, midiparse->division);
|
||||
GST_DEBUG_OBJECT (midiparse, "next position %" GST_TIME_FORMAT,
|
||||
GST_TIME_ARGS (next_position));
|
||||
|
||||
/* send 10ms ticks to advance the downstream element */
|
||||
while (TRUE) {
|
||||
guint8 midi_tick = 0xf9;
|
||||
|
||||
/* get position of next tick */
|
||||
position = ++tick * (10 * GST_MSECOND);
|
||||
GST_DEBUG_OBJECT (midiparse, "tick %" G_GUINT64_FORMAT
|
||||
", position %" GST_TIME_FORMAT, tick, GST_TIME_ARGS (position));
|
||||
|
||||
if (position >= next_position)
|
||||
break;
|
||||
|
||||
midiparse->segment.position = position;
|
||||
handle_play_midi (midiparse, midi_tick, NULL, 0, NULL);
|
||||
}
|
||||
|
||||
midiparse->pulse = next_pulse;
|
||||
midiparse->segment.position = next_position;
|
||||
|
||||
done:
|
||||
|
|
|
|||
|
|
@ -63,6 +63,7 @@ struct _GstMidiParse
|
|||
guint16 division;
|
||||
|
||||
GList *tracks;
|
||||
guint track_count;
|
||||
|
||||
guint64 offset;
|
||||
GstAdapter *adapter;
|
||||
|
|
@ -70,6 +71,7 @@ struct _GstMidiParse
|
|||
/* output data */
|
||||
gboolean discont;
|
||||
GstSegment segment;
|
||||
guint64 pulse;
|
||||
};
|
||||
|
||||
struct _GstMidiParseClass
|
||||
|
|
|
|||
Loading…
Reference in a new issue