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	io: add support for segment
Move fields from the io_position to io_segment. The segment contains the mapping between raw clock time and stream time in various formats. We keep an array of pending segments available in the io_position field so clients can anticipate changes. Make looping a flag in the segment instead of a state. Prepare for segment masters. These will be registered clients that are responsible for updating parts of the extended segment info. Add namespace to some defines.
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					 7 changed files with 137 additions and 80 deletions
				
			
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			@ -333,19 +333,25 @@ static void client_process(void *data)
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	if (this->position) {
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		jack_position_t *jp = &this->client->pos;
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		struct spa_io_position *p = this->position;
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		struct spa_io_segment *s;
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		p->rate = 1.0;
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		p->valid = 0;
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		p->n_segments = 1;
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		s = &p->segments[0];
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		s->flags = SPA_IO_SEGMENT_VALID_POSITION;
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		s->position = jp->frame;
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		s->rate = 1.0;
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		s->valid = 0;
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		if (jp->valid & JackPositionBBT) {
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			p->valid |= SPA_IO_POSITION_VALID_BAR;
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			s->valid |= SPA_IO_SEGMENT_VALID_BAR;
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			if (jp->valid & JackBBTFrameOffset)
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				p->bar.offset = jp->bbt_offset;
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				s->bar.offset = jp->bbt_offset;
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			else
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				p->bar.offset = 0;
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			p->bar.signature_num = jp->beats_per_bar;
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			p->bar.signature_denom = jp->beat_type;
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			p->bar.bpm = jp->beats_per_minute;
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			p->bar.beat = jp->bar * jp->beats_per_bar + jp->beat;
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				s->bar.offset = 0;
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			s->bar.signature_num = jp->beats_per_bar;
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			s->bar.signature_denom = jp->beat_type;
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			s->bar.bpm = jp->beats_per_minute;
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			s->bar.beat = jp->bar * jp->beats_per_bar + jp->beat;
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		}
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	}
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	spa_node_call_ready(&this->callbacks, SPA_STATUS_NEED_BUFFER);
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