audio: src: validate stream parameters at prepare time

Check that the source stream rate and channel count at prepare match
what was used to initialize the filter stages and delay lines. Since
these allocations now happen at init and persist across prepare/reset
cycles, a mismatch would cause incorrect processing or buffer overruns.

Also compare rates against the actual source stream rather than only
the IPC config, catching cases where the upstream pipeline delivers a
different rate than originally configured.

Signed-off-by: Jyri Sarha <jyri.sarha@linux.intel.com>

Author: Jyri Sarha

src/audio/src/src_ipc4.c

@@ -285,14 +285,21 @@ int src_do_prepare(struct processing_module *mod,
 {
 	struct comp_data *cd = module_get_private_data(mod);
 	struct comp_dev *dev = mod->dev;
+	unsigned int source_channels = source_get_channels(source);
+	unsigned int source_rate = source_get_rate(source);
 	int ret;
 
-	if (cd->source_rate != cd->ipc_config.base.audio_fmt.sampling_frequency ||
+	if (cd->source_rate != source_rate ||
 	    cd->sink_rate != cd->ipc_config.sink_rate) {
-		comp_err(mod->dev, "rate mismatch: source %u/%u sink %u/%u",
-			 cd->source_rate,
-			 cd->ipc_config.base.audio_fmt.sampling_frequency,
-			 cd->sink_rate, cd->ipc_config.sink_rate);
+		comp_err(dev, "rate mismatch: init %u/%u, stream %u/%u",
+			 cd->source_rate, cd->sink_rate,
+			 source_rate, cd->ipc_config.sink_rate);
+		return -EINVAL;
+	}
+
+	if (cd->channels_count != (int)source_channels) {
+		comp_err(dev, "channels mismatch: init %d, stream %u",
+			 cd->channels_count, source_channels);
 		return -EINVAL;
 	}