flac: Allow different sample rate between frames

symphonia-bundle-flac/src/decoder.rs

@@ -97,6 +97,11 @@ impl FlacDecoder {
 
         let header = read_frame_header(&mut reader, sync)?;
 
+        // Update the sample rate for this frame.
+        if let Some(sample_rate) = header.sample_rate {
+            self.buf.spec_mut().rate = sample_rate;
+        }
+
         // Use the bits per sample and sample rate as stated in the frame header, falling back to
         // the stream information if provided. If neither are available, return an error.
         let bits_per_sample = if let Some(bps) = header.bits_per_sample {

symphonia-bundle-flac/src/parser.rs

@@ -527,13 +527,6 @@ fn strict_frame_header_check(
     header: &FrameHeader,
     last_header: Option<&FrameHeader>,
 ) -> bool {
-    // Sample rate is fixed for the stream.
-    if let Some(sample_rate) = header.sample_rate {
-        if sample_rate != stream_info.sample_rate {
-            return false;
-        }
-    }
-
     // Bits per sample is fixed for the stream.
     if let Some(bps) = header.bits_per_sample {
         if bps != stream_info.bits_per_sample {

symphonia-core/src/audio.rs

@@ -329,6 +329,11 @@ impl<S: Sample> AudioBuffer<S> {
         &self.spec
     }
 
+    /// Gets a mutable signal specification for the buffer.
+    pub fn spec_mut(&mut self) -> &mut SignalSpec {
+        &mut self.spec
+    }
+
     /// Gets the total capacity of the buffer. The capacity is the maximum number of audio frames
     /// a buffer can store.
     pub fn capacity(&self) -> usize {