pw-cat: add midi support

src/tools/meson.build

@@ -28,6 +28,7 @@ if get_option('pw-cat') and sndfile_dep.found()
 
   pwcat_sources = [
     'pw-cat.c',
+    'midifile.c',
   ]
 
   pwcat_aliases = [

src/tools/midifile.c

@@ -0,0 +1,258 @@
+/* PipeWire
+ *
+ * Copyright © 2020 Wim Taymans
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <errno.h>
+
+#include "midifile.h"
+
+#define DEFAULT_TEMPO	500000	/* 500ms per quarter note (120 BPM) is the default */
+
+static inline uint16_t parse_be16(const uint8_t *in)
+{
+	return (in[0] << 8) | in[1];
+}
+
+static inline uint32_t parse_be32(const uint8_t *in)
+{
+	return (in[0] << 24) | (in[1] << 16) | (in[2] << 8) | in[3];
+}
+
+static int read_mthd(struct midi_file *mf)
+{
+	uint8_t buffer[14];
+	int res;
+
+	if ((res = mf->events->read(mf->data, mf->offset, buffer, 14)) != 14)
+		return res < 0 ? res : -EIO;
+
+	if (memcmp(buffer, "MThd", 4))
+		return -EIO;
+
+	mf->size = parse_be32(buffer + 4);
+	mf->format = parse_be16(buffer + 8);
+	mf->ntracks = parse_be16(buffer + 10);
+	mf->division = parse_be16(buffer + 12);
+	mf->offset += 14;
+	return 0;
+}
+
+int midi_file_open(struct midi_file *mf, int mode,
+		const struct midi_events *events, void *data)
+{
+	int res;
+
+	spa_zero(*mf);
+
+	mf->events = events;
+	mf->data = data;
+
+	if ((res = read_mthd(mf)) < 0)
+		return res;
+
+	spa_list_init(&mf->tracks);
+	mf->tick = 0;
+	mf->tempo = DEFAULT_TEMPO;
+
+	return 0;
+}
+
+int midi_file_close(struct midi_file *mf)
+{
+	return 0;
+}
+
+static int read_mtrk(struct midi_file *mf, struct midi_track *track)
+{
+	uint8_t buffer[8];
+	int res;
+
+	if ((res = mf->events->read(mf->data, mf->offset, buffer, 8)) != 8)
+		return res < 0 ? res : -EIO;
+
+	if (memcmp(buffer, "MTrk", 4))
+		return -EIO;
+
+	track->start = mf->offset+8;
+	track->offset = 0;
+	track->size = parse_be32(buffer + 4);
+	mf->offset += track->size + 8;
+	return 0;
+}
+
+static int parse_varlen(struct midi_file *mf, struct midi_track *tr, uint32_t *result)
+{
+	uint32_t value;
+	uint8_t buffer[1];
+	int i, res;
+
+	value = 0;
+	for (i = 0; i < 4; i++) {
+		if (tr->offset >= tr->size) {
+			tr->eof = true;
+			break;
+		}
+
+		if ((res = mf->events->read(mf->data, tr->start + tr->offset, buffer, 1)) != 1)
+			return res < 0 ? res : -EIO;
+
+		tr->offset++;
+
+		value = (value << 7) | ((buffer[0]) & 0x7f);
+		if ((buffer[0] & 0x80) == 0)
+			break;
+	}
+	*result = value;
+	return 0;
+}
+
+
+static int peek_event(struct midi_file *mf, struct midi_track *tr, struct midi_event *event)
+{
+	uint8_t buffer[4], status;
+	uint32_t size = 0, start;
+	int res;
+
+	if (tr->eof || tr->offset > tr->size)
+		return -EIO;
+
+	if ((res = mf->events->read(mf->data, tr->start + tr->offset, buffer, 1)) != 1)
+		return res < 0 ? res : -EIO;
+
+	event->track = tr;
+	event->tick = tr->tick;
+	start = event->offset = tr->offset;
+
+	status = buffer[0];
+	if ((status & 0x80) == 0) {
+		status = tr->running_status;
+	} else {
+		tr->running_status = status;
+		event->offset++;
+	}
+
+	event->status = status;
+
+	tr->offset++;
+
+	if (status < 0xf0) {
+		size++;
+		if (status < 0xc0 || status >= 0xe0)
+			size++;
+	} else {
+		if (status == 0xff) {
+			if ((res = mf->events->read(mf->data, tr->start + tr->offset, buffer, 1)) != 1)
+				return res < 0 ? res : -EIO;
+
+			tr->offset++;
+
+			if ((res = parse_varlen(mf, tr, &size)) < 0)
+				return res;
+
+			event->meta = buffer[0];
+			event->offset = tr->offset;
+
+			switch (event->meta) {
+			case 0x2f:
+				tr->eof = true;
+				break;
+			case 0x51:
+				if (size < 3)
+					break;
+
+				if ((res = mf->events->read(mf->data, tr->start + tr->offset, buffer, 3)) != 3)
+					return res < 0 ? res : -EIO;
+
+				mf->tempo = (buffer[0]<<16) | (buffer[1]<<8) | buffer[2];
+				break;
+			}
+
+		} else if (status == 0xf0 || status == 0xf7) {
+			if ((res = parse_varlen(mf, tr, &size)) < 0)
+				return res;
+			event->offset = tr->offset;
+		} else {
+			return -EIO;
+		}
+	}
+	tr->offset = start;
+
+	event->offset += tr->start;
+	event->size = size;
+
+	return 0;
+}
+
+int midi_file_add_track(struct midi_file *mf, struct midi_track *track)
+{
+	int res;
+	uint32_t delta_time;
+
+	if ((res = read_mtrk(mf, track)) < 0)
+		return res;
+
+	if ((res = parse_varlen(mf, track, &delta_time)) < 0)
+		return res;
+
+	track->tick = delta_time;
+	spa_list_init(&track->events);
+	spa_list_append(&mf->tracks, &track->link);
+
+	return 0;
+
+}
+int midi_file_peek_event(struct midi_file *mf, struct midi_event *event)
+{
+	struct midi_track *tr, *found = NULL;
+
+	spa_list_for_each(tr, &mf->tracks, link) {
+		if (tr->eof)
+			continue;
+		if (found == NULL || tr->tick < found->tick)
+			found = tr;
+	}
+	if (found == NULL)
+		return -EIO;
+
+	return peek_event(mf, found, event);
+}
+
+int midi_file_consume_event(struct midi_file *mf, struct midi_event *event)
+{
+	struct midi_track *tr = event->track;
+	uint32_t delta_time;
+	int res;
+
+	tr->offset = event->offset - tr->start + event->size;
+	if ((res = parse_varlen(mf, tr, &delta_time)) < 0)
+		return res;
+	tr->tick += delta_time;
+	return 0;
+}
+
+int midi_file_add_event(struct midi_file *mf, struct midi_track *track, struct midi_event *event)
+{
+	spa_list_append(&track->events, &event->link);
+	return 0;
+}
+

src/tools/midifile.h

@@ -0,0 +1,88 @@
+/* PipeWire
+ *
+ * Copyright © 2020 Wim Taymans
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdio.h>
+
+#include <spa/utils/defs.h>
+#include <spa/utils/list.h>
+
+struct midi_event {
+	struct spa_list link;
+
+	struct midi_track *track;
+
+	int64_t tick;
+	uint8_t status;
+	uint8_t meta;
+	uint32_t offset;
+	size_t size;
+};
+
+struct midi_track {
+	struct spa_list link;
+
+	uint32_t start;
+	uint32_t size;
+
+	uint32_t offset;
+	int64_t tick;
+	uint8_t running_status;
+	unsigned int eof:1;
+
+	struct spa_list events;
+};
+
+struct midi_events {
+	int (*read) (void *data, size_t offset, void *buf, size_t size);
+	int (*write) (void *data, size_t offset, void *buf, size_t size);
+};
+
+struct midi_file {
+	uint32_t size;
+	uint16_t format;
+	uint16_t ntracks;
+	uint16_t division;
+	uint32_t tempo;
+
+	struct spa_list tracks;
+
+	uint32_t offset;
+	int64_t tick;
+
+	const struct midi_events *events;
+	void *data;
+};
+
+int midi_file_open(struct midi_file *mf, int mode,
+		const struct midi_events *events, void *data);
+int midi_file_close(struct midi_file *mf);
+
+int midi_file_add_track(struct midi_file *mf, struct midi_track *track);
+
+int midi_file_peek_event(struct midi_file *mf, struct midi_event *event);
+int midi_file_consume_event(struct midi_file *mf, struct midi_event *event);
+
+int midi_file_add_event(struct midi_file *mf, struct midi_track *track, struct midi_event *event);
+
+

src/tools/pw-cat.c

@@ -47,6 +47,8 @@
 #include <pipewire/pipewire.h>
 #include <pipewire/global.h>
 
+#include "midifile.h"
+
 #define DEFAULT_MEDIA_TYPE	"Audio"
 #define DEFAULT_MEDIA_CATEGORY_PLAYBACK	"Playback"
 #define DEFAULT_MEDIA_CATEGORY_RECORD	"Capture"
@@ -103,6 +105,7 @@ struct data {
 
 	enum mode mode;
 	bool verbose;
+	bool midi;
 	const char *remote_name;
 	const char *media_type;
 	const char *media_category;
@@ -137,7 +140,15 @@ struct data {
 	bool targets_listed;
 	struct spa_list targets;
 
+	struct spa_io_position *position;
 	bool drained;
+	uint64_t clock_start;
+
+	struct {
+		FILE *f;
+		struct midi_file file;
+		struct midi_track track[64];
+	} md;
 };
 
 static inline int
@@ -729,6 +740,20 @@ on_state_changed(void *userdata, enum pw_stream_state old,
 	}
 }
 
+static void
+on_io_changed(void *userdata, uint32_t id, void *data, uint32_t size)
+{
+	struct data *d = userdata;
+
+	switch (id) {
+	case SPA_IO_Position:
+		d->position = data;
+		break;
+	default:
+		break;
+	}
+}
+
 static void
 on_param_changed(void *userdata, uint32_t id, const struct spa_pod *format)
 {
@@ -810,6 +835,7 @@ static void on_drained(void *userdata)
 static const struct pw_stream_events stream_events = {
 	PW_VERSION_STREAM_EVENTS,
 	.state_changed = on_state_changed,
+	.io_changed = on_io_changed,
 	.param_changed = on_param_changed,
 	.process = on_process,
 	.drained = on_drained
@@ -843,6 +869,7 @@ static const struct option long_options[] = {
 
 	{"record",	no_argument,	   NULL, 'r'},
 	{"playback",	no_argument,	   NULL, 's'},
+	{"midi",	no_argument,	   NULL, 'm'},
 
 	{"remote",	required_argument, NULL, 'R'},
 
@@ -915,6 +942,7 @@ static void show_usage(const char *name, bool is_error)
 		fprintf(fp,
 		     "  -p, --playback                        Playback mode\n"
 		     "  -r, --record                          Recording mode\n"
+		     "  -m, --midi                            Midi mode\n"
 		     "\n");
 	}
 
@@ -923,6 +951,100 @@ static void show_usage(const char *name, bool is_error)
 	     "\n");
 }
 
+static int midi_read(void *data, size_t offset, void *buf, size_t size)
+{
+	struct data *d = data;
+	fseek(d->md.f, offset, SEEK_SET);
+	return fread(buf, 1, size, d->md.f);
+}
+
+static const struct midi_events midi_events = {
+	.read = midi_read,
+};
+
+static int midi_play(struct data *d, void *src, unsigned int n_frames)
+{
+	int res;
+	struct midi_event ev;
+	struct spa_pod_builder b;
+	struct spa_pod_frame f;
+	uint8_t buf[4096];
+	uint32_t first_frame, last_frame;
+
+	spa_zero(b);
+	spa_pod_builder_init(&b, src, n_frames);
+
+        spa_pod_builder_push_sequence(&b, &f, 0);
+
+	if (d->clock_start == 0)
+		d->clock_start = d->position->clock.position;
+
+	first_frame = d->position->clock.position - d->clock_start;
+	last_frame = first_frame + d->position->clock.duration;
+
+	while (1) {
+		uint32_t frame;
+
+		res = midi_file_peek_event(&d->md.file, &ev);
+		if (res < 0)
+			return res;
+
+		frame = ev.tick * ((double)d->position->clock.rate.denom * d->md.file.tempo) /
+			(1000000.0 * d->md.file.division);
+
+		if (frame < first_frame)
+			frame = 0;
+		else if (frame < last_frame)
+			frame -= first_frame;
+		else
+			break;
+
+		spa_pod_builder_control(&b, frame, SPA_CONTROL_Midi);
+		buf[0] = ev.status;
+		if (ev.status == 0xff)
+			buf[1] = ev.meta;
+		midi_read(d, ev.offset, ev.status == 0xff ? &buf[2] : &buf[1], ev.size);
+		spa_pod_builder_bytes(&b, buf, ev.size + 1);
+
+		midi_file_consume_event(&d->md.file, &ev);
+	}
+	spa_pod_builder_pop(&b, &f);
+
+	return b.state.offset;
+}
+
+static int setup_midifile(struct data *data)
+{
+	int res;
+	uint16_t i;
+
+	data->md.f = fopen(data->filename,
+			data->mode == mode_playback ? "r" : "w");
+	if (data->md.f == NULL) {
+		fprintf(stderr, "error: failed to open midi file \"%s\": %m\n",
+				data->filename);
+		return -errno;
+	}
+
+	if ((res = midi_file_open(&data->md.file, 0, &midi_events, data)) < 0)
+		return -errno;
+
+	if (data->verbose)
+		printf("opened file \"%s\" format %08x ntracks:%d div:%d\n",
+				data->filename,
+				data->md.file.format, data->md.file.ntracks,
+				data->md.file.division);
+
+	for (i = 0; i < data->md.file.ntracks; i++) {
+		midi_file_add_track(&data->md.file, &data->md.track[i]);
+	}
+	data->fill = data->mode == mode_playback ?
+		midi_play : midi_play;
+	data->stride = 1;
+
+	return 0;
+}
+
 static int setup_sndfile(struct data *data)
 {
 	SF_INFO info;
@@ -1104,7 +1226,7 @@ int main(int argc, char *argv[])
 	/* initialize list everytime */
 	spa_list_init(&data.targets);
 
-	while ((c = getopt_long(argc, argv, "hvprR:q:", long_options, NULL)) != -1) {
+	while ((c = getopt_long(argc, argv, "hvprmR:q:", long_options, NULL)) != -1) {
 
 		switch (c) {
 
@@ -1133,6 +1255,10 @@ int main(int argc, char *argv[])
 			data.mode = mode_record;
 			break;
 
+		case 'm':
+			data.midi = true;
+			break;
+
 		case 'R':
 			data.remote_name = optarg;
 			break;
@@ -1310,7 +1436,11 @@ int main(int argc, char *argv[])
 	if (!data.list_targets) {
 		struct spa_audio_info_raw info;
 
-		ret = setup_sndfile(&data);
+		if (data.midi)
+			ret = setup_midifile(&data);
+		else
+			ret = setup_sndfile(&data);
+
 		if (ret < 0) {
 			fprintf(stderr, "error: open failed: %s\n", spa_strerror(ret));
 			switch (ret) {
@@ -1321,16 +1451,26 @@ int main(int argc, char *argv[])
 				goto error_usage;
 			}
 		}
-		info = SPA_AUDIO_INFO_RAW_INIT(
-			.flags = data.channelmap.n_channels ? 0 : SPA_AUDIO_FLAG_UNPOSITIONED,
-			.format = data.spa_format,
-			.rate = data.rate,
-			.channels = data.channels);
 
-		if (data.channelmap.n_channels)
-			memcpy(info.position, data.channelmap.channels, data.channels * sizeof(int));
+		if (!data.midi) {
+			info = SPA_AUDIO_INFO_RAW_INIT(
+				.flags = data.channelmap.n_channels ? 0 : SPA_AUDIO_FLAG_UNPOSITIONED,
+				.format = data.spa_format,
+				.rate = data.rate,
+				.channels = data.channels);
 
-		params[0] = spa_format_audio_raw_build(&b, SPA_PARAM_EnumFormat, &info);
+			if (data.channelmap.n_channels)
+				memcpy(info.position, data.channelmap.channels, data.channels * sizeof(int));
+
+			params[0] = spa_format_audio_raw_build(&b, SPA_PARAM_EnumFormat, &info);
+		} else {
+			params[0] = spa_pod_builder_add_object(&b,
+					SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
+					SPA_FORMAT_mediaType,		SPA_POD_Id(SPA_MEDIA_TYPE_application),
+					SPA_FORMAT_mediaSubtype,	SPA_POD_Id(SPA_MEDIA_SUBTYPE_control));
+
+			pw_properties_set(data.props, PW_KEY_FORMAT_DSP, "8 bit raw midi");
+		}
 
 		data.stream = pw_stream_new(data.core, prog, data.props);
 		data.props = NULL;