Audio: Selector: Add support for multiple up/down-mix profiles

This patch extends the struct ipc4_selector_coeffs_config. The
first 16-bit reserved field is split into to 8-bit field
for source and sink channels count.

The configuration is changed to array of the previous structs
instead of single. When preparing for stream the array is checked
for matching number of channels for source and sink and if found
the coefficients for the channels counts is selected into use.

The change avoids the need for user space to update the
configuration in runtime if the blob used for initialization
contains all the needed channels up/down-mix profiles.

Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>

Author: singalsu

src/audio/selector/selector.c

@@ -37,6 +37,10 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#if CONFIG_IPC_MAJOR_4
+#define SEL_MAX_CONFIG_BLOB_SIZE (SEL_MAX_NUM_CONFIGS * sizeof(struct ipc4_selector_coeffs_config))
+#endif
+
 LOG_MODULE_REGISTER(selector, CONFIG_SOF_LOG_LEVEL);
 
 #if CONFIG_IPC_MAJOR_3
@@ -574,7 +578,7 @@ static void build_config(struct comp_data *cd, struct module_config *cfg)
 	/* Build default coefficient array (unity Q10 on diagonal, i.e. pass-through mode) */
 	memset(&cd->coeffs_config, 0, sizeof(cd->coeffs_config));
 	for (i = 0; i < MIN(SEL_SOURCE_CHANNELS_MAX, SEL_SINK_CHANNELS_MAX); i++)
-		cd->coeffs_config.coeffs[i][i] = 1 << 10;
+		cd->coeffs_config.coeffs[i][i] = SEL_COEF_ONE_Q10;
 }
 
 static int selector_init(struct processing_module *mod)
@@ -617,8 +621,8 @@ static int selector_init(struct processing_module *mod)
 	if (!cd)
 		return -ENOMEM;
 
-	cd->sel_ipc4_cfg.init_payload_fmt = payload_fmt;
 	md->private = cd;
+	cd->sel_ipc4_cfg.init_payload_fmt = payload_fmt;
 
 	if (payload_fmt == IPC4_SEL_INIT_PAYLOAD_BASE_WITH_EXT) {
 		size_t size = sizeof(struct sof_selector_ipc4_pin_config);
@@ -733,6 +737,7 @@ static int selector_free(struct processing_module *mod)
 
 	comp_dbg(mod->dev, "entry");
 
+	mod_free(mod, cd->multi_coeffs_config);
 	mod_free(mod, cd);
 
 	return 0;
@@ -769,13 +774,51 @@ static int selector_set_config(struct processing_module *mod, uint32_t config_id
 			       size_t response_size)
 {
 	struct comp_data *cd = module_get_private_data(mod);
+	struct comp_dev *dev = mod->dev;
+	int n;
 
 	if (config_id == IPC4_SELECTOR_COEFFS_CONFIG_ID) {
-		if (data_offset_size != sizeof(cd->coeffs_config))
+		if (data_offset_size > SEL_MAX_CONFIG_BLOB_SIZE ||
+		    pos != MODULE_CFG_FRAGMENT_SINGLE) {
+			comp_err(dev, "Failure with size %u pos %u", data_offset_size, pos);
 			return -EINVAL;
+		}
 
-		memcpy_s(&cd->coeffs_config, sizeof(cd->coeffs_config), fragment, data_offset_size);
-		return 0;
+		/* The size must be N times the coefficient vectors size of one channels
+		 * up/down mix profile.
+		 */
+		n = data_offset_size / sizeof(struct ipc4_selector_coeffs_config);
+		if (n < 1 || data_offset_size != n * sizeof(struct ipc4_selector_coeffs_config)) {
+			comp_err(dev, "Invalid configuration size.");
+			return -EINVAL;
+		}
+
+		cd->num_configs = n;
+		if (cd->multi_coeffs_config) {
+			if (cd->multi_coeffs_config_size < data_offset_size) {
+				/* Configuration exist but the allocation is too
+				 * small to write over.
+				 */
+				mod_free(mod, cd->multi_coeffs_config);
+				cd->multi_coeffs_config_size = data_offset_size;
+				cd->multi_coeffs_config =
+					mod_alloc(mod, cd->multi_coeffs_config_size);
+			}
+		} else {
+			/* No existing configuration */
+			cd->multi_coeffs_config_size = data_offset_size;
+			cd->multi_coeffs_config = mod_alloc(mod, cd->multi_coeffs_config_size);
+		}
+
+		if (!cd->multi_coeffs_config) {
+			comp_err(dev, "Failed to allocate configuration blob.");
+			return -ENOMEM;
+		}
+
+		/* Copy the configuration and notify for need to re-configure */
+		cd->new_config = true;
+		return memcpy_s(cd->multi_coeffs_config, cd->multi_coeffs_config_size,
+				fragment, data_offset_size);
 	}
 
 	return -EINVAL;
@@ -788,6 +831,111 @@ static int selector_get_config(struct processing_module *mod, uint32_t config_id
 	return 0;
 }
 
+/**
+ * \brief Loop the array of mix coefficients sets and find a set with matching channels
+ * in and out count.
+ * \param[in] cd Selector component data.
+ * \param[in] source_channels Number of channels in source.
+ * \param[in] sink_channels Number of channels in sink.
+ *
+ * \return Pointer to the matching ipc4_selector_coeffs_config if found, or NULL if
+ * no matching configuration exists.
+ */
+static struct ipc4_selector_coeffs_config *selector_config_array_search(struct comp_data *cd,
+									int source_channels,
+									int sink_channels)
+{
+	struct ipc4_selector_coeffs_config *found = NULL;
+	int i;
+
+	for (i = 0; i < cd->num_configs; i++) {
+		if (cd->multi_coeffs_config[i].source_channels_count == source_channels &&
+		    cd->multi_coeffs_config[i].sink_channels_count == sink_channels) {
+			found = &cd->multi_coeffs_config[i];
+			break;
+		}
+	}
+
+	return found;
+}
+
+/**
+ * \brief Get mix coefficients set from configuration blob with multiple coefficients sets.
+ *  Also activate more efficient pass-through copy mode if the coefficients indicate 1:1
+ *  copy from source to sink.
+ * \param[in,out] mod Selector base module device.
+ * \param[in] source_channels Number of channels in source.
+ * \param[in] sink_channels Number of channels in sink.
+ *
+ * \return Error code.
+ */
+static int selector_find_coefficients(struct processing_module *mod)
+{
+	struct comp_data *cd = module_get_private_data(mod);
+	struct comp_dev *dev = mod->dev;
+	struct ipc4_selector_coeffs_config *config;
+	uint32_t source_channels = cd->config.in_channels_count;
+	uint32_t sink_channels = cd->config.out_channels_count;
+	int16_t coef;
+	int ret, i, j;
+
+	/* In set_config() the blob is copied to cd->multi_coeffs_config. A legacy blob contains a
+	 * single set of mix coefficients without channels information. A new blob with multiple
+	 * configurations has the source and sink channels count information. If there has been no
+	 * set_config(), then the cd->coeffs_config has been initialized in set_selector_params()
+	 * to mix with coefficients SEL_COEF_ONE_Q10 for matching input and output channels.
+	 */
+	if (cd->multi_coeffs_config) {
+		config = cd->multi_coeffs_config;
+		if (cd->num_configs > 1) {
+			config = selector_config_array_search(cd, source_channels, sink_channels);
+			/* If not found, check if pass-through mix is defined for the max
+			 * channels count (8).
+			 */
+			if (!config &&  source_channels == sink_channels)
+				config = selector_config_array_search(cd, SEL_SOURCE_CHANNELS_MAX,
+								      SEL_SINK_CHANNELS_MAX);
+
+			if (!config) {
+				comp_err(dev, "No mix coefficients found for %d to %d channels.",
+					 source_channels, sink_channels);
+				return -EINVAL;
+			}
+		}
+
+		ret = memcpy_s(&cd->coeffs_config, sizeof(struct ipc4_selector_coeffs_config),
+			       config, sizeof(*config));
+		if (ret)
+			return ret;
+	}
+
+	/* The pass-through copy function can be used if coefficients are a unit matrix for
+	 * 1:1 stream copy.
+	 */
+	if (source_channels == sink_channels) {
+		cd->passthrough = true;
+		for (i = 0; i < sink_channels; i++) {
+			for (j = 0; j < source_channels; j++) {
+				coef = cd->coeffs_config.coeffs[i][j];
+				if ((i == j && coef != SEL_COEF_ONE_Q10) || (i != j && coef != 0)) {
+					cd->passthrough = false;
+					break;
+				}
+			}
+		}
+	} else {
+		cd->passthrough = false;
+	}
+
+	if (cd->passthrough)
+		comp_info(dev, "Passthrough mode.");
+	else
+		comp_info(dev, "Using coefficients for %d to %d channels.",
+			  source_channels, sink_channels);
+
+	return 0;
+}
+
 /**
  * \brief Copies and processes stream data.
  * \param[in,out] mod Selector base module device.
@@ -799,11 +947,29 @@ static int selector_process(struct processing_module *mod,
 			    struct output_stream_buffer *output_buffers,
 			    int num_output_buffers)
 {
+	struct audio_stream *source;
+	struct audio_stream *sink;
 	struct comp_data *cd = module_get_private_data(mod);
 	uint32_t avail_frames = input_buffers[0].size;
+	int ret;
 
 	comp_dbg(mod->dev, "entry");
 
+	if (cd->new_config) {
+		cd->new_config = false;
+		ret = selector_find_coefficients(mod);
+		if (ret)
+			return ret;
+	}
+
+	if (cd->passthrough) {
+		source = input_buffers->data;
+		sink = output_buffers->data;
+		audio_stream_copy(source, 0, sink, 0, avail_frames * cd->config.in_channels_count);
+		module_update_buffer_position(input_buffers, output_buffers, avail_frames);
+		return 0;
+	}
+
 	if (avail_frames)
 		/* copy selected channels from in to out */
 		cd->sel_func(mod, input_buffers, output_buffers, avail_frames);
@@ -850,17 +1016,7 @@ static int selector_prepare(struct processing_module *mod,
 	/* get sink data format and period bytes */
 	cd->sink_format = audio_stream_get_frm_fmt(&sinkb->stream);
 	cd->sink_period_bytes = audio_stream_period_bytes(&sinkb->stream, dev->frames);
-
-	/* There is an assumption that sink component will report out
-	 * proper number of channels [1] for selector to actually
-	 * reduce channel count between source and sink
-	 */
-	comp_info(dev, "source sink channel = %u %u",
-		  audio_stream_get_channels(&sourceb->stream),
-		  audio_stream_get_channels(&sinkb->stream));
-
 	sink_size = audio_stream_get_size(&sinkb->stream);
-
 	md->mpd.in_buff_size = cd->source_period_bytes;
 	md->mpd.out_buff_size = cd->sink_period_bytes;
 
@@ -891,6 +1047,11 @@ static int selector_prepare(struct processing_module *mod,
 		return -EINVAL;
 	}
 
+	if (cd->new_config) {
+		cd->new_config = false;
+		return selector_find_coefficients(mod);
+	}
+
 	return 0;
 }
 
@@ -908,7 +1069,9 @@ static int selector_reset(struct processing_module *mod)
 	cd->source_period_bytes = 0;
 	cd->sink_period_bytes = 0;
 	cd->sel_func = NULL;
-
+	cd->num_configs = 0;
+	cd->passthrough = false;
+	cd->new_config = false;
 	return 0;
 }
 

src/include/sof/audio/selector.h

@@ -27,6 +27,9 @@
 struct comp_buffer;
 struct comp_dev;
 
+/** \brief Default mix gain. */
+#define SEL_COEF_ONE_Q10 1024 /* int16(1 * 2^10) */
+
 #if CONFIG_IPC_MAJOR_3
 /** \brief Supported channel count on input. */
 #define SEL_SOURCE_2CH 2
@@ -43,6 +46,9 @@ struct comp_dev;
 /** \brief Maximum supported channel count on output. */
 #define SEL_SINK_CHANNELS_MAX   8
 
+/** \brief Maximum number of configurations in the blob received with set_config() */
+#define SEL_MAX_NUM_CONFIGS	8
+
 #define SEL_NUM_IN_PIN_FMTS	1
 #define SEL_NUM_OUT_PIN_FMTS	1
 
@@ -60,8 +66,10 @@ enum ipc4_selector_config_id {
 
 /** \brief IPC4 mixing coefficients configuration. */
 struct ipc4_selector_coeffs_config {
-	uint16_t rsvd0;	/**< Unused field, keeps the structure aligned with common layout */
-	uint16_t rsvd1;	/**< Unused field, keeps the structure aligned with common layout */
+	uint8_t source_channels_count; /**< Used when multiple profiles are packed into one blob. */
+	uint8_t sink_channels_count; /**< Used when multiple profiles are packed into one blob. */
+	uint8_t source_channel_config; /**< Used when multiple profiles are packed into one blob. */
+	uint8_t sink_channel_config; /**< Used when multiple profiles are packed into one blob. */
 
 	/** Mixing coefficients in Q10 fixed point format */
 	int16_t coeffs[SEL_SINK_CHANNELS_MAX][SEL_SOURCE_CHANNELS_MAX];
@@ -109,6 +117,8 @@ struct comp_data {
 #if CONFIG_IPC_MAJOR_4
 	struct sof_selector_ipc4_config sel_ipc4_cfg;
 	struct ipc4_selector_coeffs_config coeffs_config;
+	struct ipc4_selector_coeffs_config *multi_coeffs_config;
+	size_t multi_coeffs_config_size;
 #endif
 
 	uint32_t source_period_bytes;	/**< source number of period bytes */
@@ -117,6 +127,9 @@ struct comp_data {
 	enum sof_ipc_frame sink_format;		/**< sink frame format */
 	struct sof_sel_config config;	/**< component configuration data */
 	sel_func sel_func;	/**< channel selector processing function */
+	int num_configs;	/**< Number of coefficients sets in configuration blob. */
+	bool passthrough;	/**< Use a passthrough copy function when no up/down mix. */
+	bool new_config;	/**< True if new configuration has been received */
 };
 
 /** \brief Selector processing functions map. */