audio: stream: Add end of stream state

Add new STREAM_STATE_END_OF_STREAM state indicating the end of a stream.
Additional state STREAM_STATE_END_OF_STREAM_FLUSH indicates that end of
stream has been detected, but silence is transmitted for the needs of
DP modules.

Signed-off-by: Adrian Warecki <adrian.warecki@intel.com>

Author: softwarecki

src/include/module/audio/audio_stream.h

@@ -25,6 +25,10 @@
 enum sof_audio_buffer_state {
 	AUDIOBUF_STATE_INITIAL,			/* Initial state, hw params not configured. */
 	AUDIOBUF_STATE_READY,			/* Stream ready, hw params configured */
+	AUDIOBUF_STATE_END_OF_STREAM,		/* Detected End Of Stream */
+	AUDIOBUF_STATE_END_OF_STREAM_FLUSH,	/* Detected End Of Stream, generating silence
+						 * to flush buffers in dp modules.
+						 */
 };
 
 /**

src/include/module/audio/source_api.h

@@ -323,4 +323,9 @@ static inline struct processing_module *source_get_bound_module(struct sof_sourc
 	return source->bound_module;
 }
 
+static inline enum sof_audio_buffer_state source_get_state(const struct sof_source *source)
+{
+	return source->audio_stream_params->state;
+}
+
 #endif /* __MODULE_AUDIO_SOURCE_API_H__ */

src/include/sof/audio/audio_buffer.h

@@ -227,6 +227,23 @@ static inline void audio_buffer_reset_params(struct sof_audio_buffer *buffer)
 	buffer->audio_stream_params->state = AUDIOBUF_STATE_INITIAL;
 }
 
+static inline enum sof_audio_buffer_state audio_buffer_get_state(
+	const struct sof_audio_buffer *buffer)
+{
+	return buffer->audio_stream_params->state;
+}
+
+static inline void audio_buffer_set_state(struct sof_audio_buffer *buffer,
+					  enum sof_audio_buffer_state state)
+{
+	buffer->audio_stream_params->state = state;
+}
+
+static inline void audio_buffer_set_eos(struct sof_audio_buffer *buffer)
+{
+	buffer->audio_stream_params->state = AUDIOBUF_STATE_END_OF_STREAM;
+}
+
 static inline uint16_t audio_buffer_get_chmap(struct sof_audio_buffer *buffer, size_t index)
 {
 	return buffer->audio_stream_params->chmap[index];