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	tweak number of buffers
In most cases we can use just 1 buffer. The alsa-pcm-source needs at least 2 buffers so increment the min limit.
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					 8 changed files with 9 additions and 9 deletions
				
			
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			@ -2218,7 +2218,7 @@ static int param_buffers(struct client *c, struct port *p,
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	case TYPE_ID_MIDI:
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		*param = spa_pod_builder_add_object(b,
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			SPA_TYPE_OBJECT_ParamBuffers, SPA_PARAM_Buffers,
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			SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int(2, 1, MAX_BUFFERS),
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			SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int(1, 1, MAX_BUFFERS),
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			SPA_PARAM_BUFFERS_blocks,  SPA_POD_Int(1),
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			SPA_PARAM_BUFFERS_size,    SPA_POD_CHOICE_STEP_Int(
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								c->max_frames * sizeof(float),
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			@ -2231,7 +2231,7 @@ static int param_buffers(struct client *c, struct port *p,
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	case TYPE_ID_VIDEO:
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		*param = spa_pod_builder_add_object(b,
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			SPA_TYPE_OBJECT_ParamBuffers, SPA_PARAM_Buffers,
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			SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int(2, 1, MAX_BUFFERS),
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			SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int(1, 1, MAX_BUFFERS),
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			SPA_PARAM_BUFFERS_blocks,  SPA_POD_Int(1),
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			SPA_PARAM_BUFFERS_size,    SPA_POD_CHOICE_RANGE_Int(
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								320 * 240 * 4 * 4,
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