~hc/RK356X_SDK_RELEASE.git

..	..	@@ -151,6 +151,57 @@
151	151	- Addition of encoding options when required (derived from OpenMAX IL)
152	152	- Addition of rateControlSupported (missing in OpenMAX AL)
153	153
	154	+State Machine
	155	+=============
	156	+
	157	+The compressed audio stream state machine is described below ::
	158	+
	159	+ +----------+
	160	+ \| \|
	161	+ \| OPEN \|
	162	+ \| \|
	163	+ +----------+
	164	+ \|
	165	+ \|
	166	+ \| compr_set_params()
	167	+ \|
	168	+ v
	169	+ compr_free() +----------+
	170	+ +------------------------------------\| \|
	171	+ \| \| SETUP \|
	172	+ \| +-------------------------\| \|<-------------------------+
	173	+ \| \| compr_write() +----------+ \|
	174	+ \| \| ^ \|
	175	+ \| \| \| compr_drain_notify() \|
	176	+ \| \| \| or \|
	177	+ \| \| \| compr_stop() \|
	178	+ \| \| \| \|
	179	+ \| \| +----------+ \|
	180	+ \| \| \| \| \|
	181	+ \| \| \| DRAIN \| \|
	182	+ \| \| \| \| \|
	183	+ \| \| +----------+ \|
	184	+ \| \| ^ \|
	185	+ \| \| \| \|
	186	+ \| \| \| compr_drain() \|
	187	+ \| \| \| \|
	188	+ \| v \| \|
	189	+ \| +----------+ +----------+ \|
	190	+ \| \| \| compr_start() \| \| compr_stop() \|
	191	+ \| \| PREPARE \|------------------->\| RUNNING \|--------------------------+
	192	+ \| \| \| \| \| \|
	193	+ \| +----------+ +----------+ \|
	194	+ \| \| \| ^ \|
	195	+ \| \|compr_free() \| \| \|
	196	+ \| \| compr_pause() \| \| compr_resume() \|
	197	+ \| \| \| \| \|
	198	+ \| v v \| \|
	199	+ \| +----------+ +----------+ \|
	200	+ \| \| \| \| \| compr_stop() \|
	201	+ +--->\| FREE \| \| PAUSE \|---------------------------+
	202	+ \| \| \| \|
	203	+ +----------+ +----------+
	204	+
154	205
155	206	Gapless Playback
156	207	================
..	..	@@ -183,11 +234,6 @@
183	234	EOF is reached and now DSP can start skipping padding delay. Also next write
184	235	data would belong to next track
185	236
186		-- set_next_track_param
187		-This routine is called to send to DSP codec specific data of subsequent track
188		-in gapless before first write.
189		-
190		-
191	237	Sequence flow for gapless would be:
192	238	- Open
193	239	- Get caps / codec caps
..	..	@@ -199,12 +245,43 @@
199	245	- Indicate next track data by sending set_next_track
200	246	- Set metadata of the next track
201	247	- then call partial_drain to flush most of buffer in DSP
202		-- set codec specific data of subsequent track
203	248	- Fill data of the next track
204	249	- DSP switches to second track
205	250
206	251	(note: order for partial_drain and write for next track can be reversed as well)
207	252
	253	+Gapless Playback SM
	254	+===================
	255	+
	256	+For Gapless, we move from running state to partial drain and back, along
	257	+with setting of meta_data and signalling for next track ::
	258	+
	259	+
	260	+ +----------+
	261	+ compr_drain_notify() \| \|
	262	+ +------------------------>\| RUNNING \|
	263	+ \| \| \|
	264	+ \| +----------+
	265	+ \| \|
	266	+ \| \|
	267	+ \| \| compr_next_track()
	268	+ \| \|
	269	+ \| V
	270	+ \| +----------+
	271	+ \| \| \|
	272	+ \| \|NEXT_TRACK\|
	273	+ \| \| \|
	274	+ \| +----------+
	275	+ \| \|
	276	+ \| \|
	277	+ \| \| compr_partial_drain()
	278	+ \| \|
	279	+ \| V
	280	+ \| +----------+
	281	+ \| \| \|
	282	+ +------------------------ \| PARTIAL_ \|
	283	+ \| DRAIN \|
	284	+ +----------+
208	285
209	286	Not supported
210	287	=============