audio_stream: Rename/redocument audio_stream_set_align

After recent changes, the audio_stream_init_alignment_constants()
routine isn't an "init" step anymore, it sets requirements and can be
called at any time.  Rename it to "audio_stream_set_align()" to better
capture its behavior, and rework the documentation to make it clearer
how it works.

Signed-off-by: Andy Ross <andyross@google.com>

src/audio/aria/aria.c

@@ -163,7 +163,7 @@ static void aria_set_stream_params(struct comp_buffer *buffer,
 
 	ipc4_update_buffer_format(buffer, audio_fmt);
 #ifndef ARIA_GENERIC
-	audio_stream_init_alignment_constants(8, 1, &buffer->stream);
+	audio_stream_set_align(8, 1, &buffer->stream);
 #endif
 }
 

src/audio/audio_stream.c

@@ -93,7 +93,7 @@ void audio_stream_recalc_align(struct audio_stream *stream)
 			(is_power_of_2(process_size) ? 31 : 32) - clz(process_size);
 }
 
-void audio_stream_init_alignment_constants(const uint32_t byte_align,
+void audio_stream_set_align(const uint32_t byte_align,
 					   const uint32_t frame_align_req,
 					   struct audio_stream *stream)
 {
@@ -139,7 +139,7 @@ static int audio_stream_source_set_alignment_constants(struct sof_source *source
 {
 	struct audio_stream *audio_stream = container_of(source, struct audio_stream, source_api);
 
-	audio_stream_init_alignment_constants(byte_align, frame_align_req, audio_stream);
+	audio_stream_set_align(byte_align, frame_align_req, audio_stream);
 
 	return 0;
 }
@@ -150,7 +150,7 @@ static int audio_stream_sink_set_alignment_constants(struct sof_sink *sink,
 {
 	struct audio_stream *audio_stream = container_of(sink, struct audio_stream, sink_api);
 
-	audio_stream_init_alignment_constants(byte_align, frame_align_req, audio_stream);
+	audio_stream_set_align(byte_align, frame_align_req, audio_stream);
 
 	return 0;
 }
@@ -195,7 +195,7 @@ void audio_stream_init(struct audio_stream *audio_stream, void *buff_addr, uint3
 	audio_stream->addr = buff_addr;
 	audio_stream->end_addr = (char *)audio_stream->addr + size;
 
-	audio_stream_init_alignment_constants(1, 1, audio_stream);
+	audio_stream_set_align(1, 1, audio_stream);
 	source_init(audio_stream_get_source(audio_stream), &audio_stream_source_ops,
 		    &audio_stream->runtime_stream_params);
 	sink_init(audio_stream_get_sink(audio_stream), &audio_stream_sink_ops,

src/audio/eq_fir/eq_fir.c

@@ -402,8 +402,8 @@ static void eq_fir_set_alignment(struct audio_stream *source,
 	const uint32_t byte_align = 1;
 	const uint32_t frame_align_req = 2; /* Process multiples of 2 frames */
 
-	audio_stream_init_alignment_constants(byte_align, frame_align_req, source);
-	audio_stream_init_alignment_constants(byte_align, frame_align_req, sink);
+	audio_stream_set_align(byte_align, frame_align_req, source);
+	audio_stream_set_align(byte_align, frame_align_req, sink);
 }
 
 static int eq_fir_prepare(struct processing_module *mod,

src/audio/eq_iir/eq_iir.c

@@ -174,8 +174,8 @@ static void eq_iir_set_alignment(struct audio_stream *source,
 	const uint32_t byte_align = 8;
 	const uint32_t frame_align_req = 2;
 
-	audio_stream_init_alignment_constants(byte_align, frame_align_req, source);
-	audio_stream_init_alignment_constants(byte_align, frame_align_req, sink);
+	audio_stream_set_align(byte_align, frame_align_req, source);
+	audio_stream_set_align(byte_align, frame_align_req, sink);
 }
 
 static int eq_iir_prepare(struct processing_module *mod,

src/audio/mixer/mixer.c

@@ -205,7 +205,7 @@ static inline void mixer_set_frame_alignment(struct audio_stream *source)
 	/*There is no limit for frame number, so set it as 1*/
 	const uint32_t frame_align_req = 1;
 
-	audio_stream_init_alignment_constants(byte_align, frame_align_req, source);
+	audio_stream_set_align(byte_align, frame_align_req, source);
 #endif
 }
 

src/audio/selector/selector.c

@@ -847,8 +847,8 @@ static int selector_prepare(struct processing_module *mod,
 	sourceb = list_first_item(&dev->bsource_list, struct comp_buffer, sink_list);
 	sinkb = list_first_item(&dev->bsink_list, struct comp_buffer, source_list);
 
-	audio_stream_init_alignment_constants(4, 1, &sourceb->stream);
-	audio_stream_init_alignment_constants(4, 1, &sinkb->stream);
+	audio_stream_set_align(4, 1, &sourceb->stream);
+	audio_stream_set_align(4, 1, &sinkb->stream);
 
 	/* get source data format and period bytes */
 	cd->source_format = audio_stream_get_frm_fmt(&sourceb->stream);

src/audio/tdfb/tdfb.c

@@ -518,8 +518,8 @@ static void tdfb_set_alignment(struct audio_stream *source,
 	const uint32_t byte_align = 1;
 	const uint32_t frame_align_req = 2; /* Process multiples of 2 frames */
 
-	audio_stream_init_alignment_constants(byte_align, frame_align_req, source);
-	audio_stream_init_alignment_constants(byte_align, frame_align_req, sink);
+	audio_stream_set_align(byte_align, frame_align_req, source);
+	audio_stream_set_align(byte_align, frame_align_req, sink);
 }
 
 static int tdfb_prepare(struct processing_module *mod,

src/audio/volume/volume.c

@@ -632,8 +632,8 @@ static void volume_set_alignment(struct audio_stream *source,
 	/*There is no limit for frame number, so both source and sink set it to be 1*/
 	const uint32_t frame_align_req = 1;
 
-	audio_stream_init_alignment_constants(byte_align, frame_align_req, source);
-	audio_stream_init_alignment_constants(byte_align, frame_align_req, sink);
+	audio_stream_set_align(byte_align, frame_align_req, source);
+	audio_stream_set_align(byte_align, frame_align_req, sink);
 #endif
 }
 

src/include/sof/audio/audio_stream.h

@@ -338,20 +338,20 @@ static inline uint32_t audio_stream_sample_bytes(const struct audio_stream *buf)
 }
 
 /**
- * Set align_shift_idx and align_frame_cnt of stream according to byte_align and
- * frame_align_req alignment requirement. Once the channel number,frame size
- * are determined，the align_frame_cnt and align_shift_idx are determined too.
- * these two feature will be used in audio_stream_get_avail_frames_aligned
- * to calculate the available frames. it should be called in component prepare
- * or param functions only once before stream copy. if someone forgets to call
- * this first, there would be unexampled error such as nothing is copied at all.
+ * @brief Set processing alignment requirements
+ *
+ * Sets the sample byte alignment and aligned frame count required for
+ * processing done on this stream.  This function may be called at any
+ * time, the internal constants are recalculated if the frame/sample
+ * size changes.  @see audio_stream_avail_frames_aligned().
+ *
  * @param byte_align Processing byte alignment requirement.
  * @param frame_align_req Processing frames alignment requirement.
  * @param stream Sink or source stream structure which to be set.
  */
-void audio_stream_init_alignment_constants(const uint32_t byte_align,
-					   const uint32_t frame_align_req,
-					   struct audio_stream *stream);
+void audio_stream_set_align(const uint32_t byte_align,
+			    const uint32_t frame_align_req,
+			    struct audio_stream *stream);
 
 /**
  * Applies parameters to the buffer.