add symphonia codec support for opening and exporting encoded files (not bendable since that would lead to data corruption)

bingus/src/snd/simphonia.rs

@@ -1,31 +1,40 @@
-use std::io;
+use std::io::{self, Read};
 
+use derive_new::new;
 use symphonia::{
     core::{
-        audio::{RawSample, RawSampleBuffer},
+        audio::Signal,
+        codecs::Decoder,
+        conv::FromSample,
+        errors::Error,
+        formats::FormatReader,
         io::MediaSourceStream,
         probe::Hint,
-        sample::Sample,
+        sample::{i24, u24},
     },
     default,
 };
 
-use crate::TryFromDataBytes;
+use crate::{IntoDataBytes, TryFromDataBytes};
 
-pub struct Audio<S>(RawSampleBuffer<S>)
+use super::{RawSamples, Sample};
-where
-    S: Sample + RawSample;
 
-impl<S> TryFromDataBytes for Audio<S>
+/// The new hot thing: this represents audio in any format. You can open any file and make this thing with the file's bytes.
-where
+/// You can then modify its bytes and see what it gives. Maybe it won't work anymore.
-    S: Sample + RawSample,
+/// You can also decode it to raw samples and play with it freely without corrupting anything.
-{
+#[derive(new)]
-    type Error = symphonia::core::errors::Error;
+pub struct Audio {
+    reader: Box<dyn FormatReader>,
+    decoder: Box<dyn Decoder>,
+}
+
+impl TryFromDataBytes for Audio {
+    type Error = Error;
     type Format = Hint;
     fn try_from_data_bytes(
         bytes: crate::Bytes,
         format: Self::Format,
-        crop: crate::Crop,
+        _crop: crate::Crop,
     ) -> Result<Self, Self::Error>
     where
         Self: Sized,
@@ -37,6 +46,84 @@ where
         let reader = probe
             .format(&format, mss, &Default::default(), &Default::default())?
             .format;
-        todo!()
+        let decoder = registry.make(&Default::default(), &Default::default())?;
+        Ok(Audio::new(reader, decoder))
+    }
+}
+
+impl IntoDataBytes for Audio {
+    fn into_data_bytes(self) -> crate::Bytes {
+        self.reader.into_inner().bytes().flatten().collect()
+    }
+}
+
+macro_rules! dynamic_map(
+        ($dynimage: expr, $image: pat => $action: expr) => ({
+            match $dynimage {
+                symphonia::core::audio::AudioBufferRef::U8($image) => symphonia::core::audio::AudioBufferRef::U8($action),
+                symphonia::core::audio::AudioBufferRef::U16($image) => symphonia::core::audio::AudioBufferRef::U16($action),
+                symphonia::core::audio::AudioBufferRef::U24($image) => symphonia::core::audio::AudioBufferRef::U24($action),
+                symphonia::core::audio::AudioBufferRef::U32($image) => symphonia::core::audio::AudioBufferRef::U32($action),
+                symphonia::core::audio::AudioBufferRef::S8($image) => symphonia::core::audio::AudioBufferRef::S8($action),
+                symphonia::core::audio::AudioBufferRef::S16($image) => symphonia::core::audio::AudioBufferRef::S16($action),
+                symphonia::core::audio::AudioBufferRef::S24($image) => symphonia::core::audio::AudioBufferRef::S24($action),
+                symphonia::core::audio::AudioBufferRef::S32($image) => symphonia::core::audio::AudioBufferRef::S32($action),
+                symphonia::core::audio::AudioBufferRef::F32($image) => symphonia::core::audio::AudioBufferRef::F32($action),
+                symphonia::core::audio::AudioBufferRef::F64($image) => symphonia::core::audio::AudioBufferRef::F64($action),
+            }
+        });
+
+        ($dynimage: expr, $image:pat_param, $action: expr) => (
+            match $dynimage {
+                symphonia::core::audio::AudioBufferRef::U8($image) => $action,
+                symphonia::core::audio::AudioBufferRef::U16($image) => $action,
+                symphonia::core::audio::AudioBufferRef::U24($image) => $action,
+                symphonia::core::audio::AudioBufferRef::U32($image) => $action,
+                symphonia::core::audio::AudioBufferRef::S8($image) => $action,
+                symphonia::core::audio::AudioBufferRef::S16($image) => $action,
+                symphonia::core::audio::AudioBufferRef::S24($image) => $action,
+                symphonia::core::audio::AudioBufferRef::S32($image) => $action,
+                symphonia::core::audio::AudioBufferRef::F32($image) => $action,
+                symphonia::core::audio::AudioBufferRef::F64($image) => $action,
+            }
+        );
+);
+
+impl<S> From<Audio> for RawSamples<S>
+where
+    S: Sample
+        + FromSample<u8>
+        + FromSample<u16>
+        + FromSample<u24>
+        + FromSample<u32>
+        + FromSample<i8>
+        + FromSample<i16>
+        + FromSample<i24>
+        + FromSample<i32>
+        + FromSample<f32>
+        + FromSample<f64>,
+{
+    fn from(mut value: Audio) -> Self {
+        RawSamples::from({
+            let mut result = Vec::new();
+            while let Ok(packet) = value.reader.next_packet() {
+                if let Ok(src) = value.decoder.decode(&packet) {
+                    dynamic_map!(
+                        src,
+                        ref audio_buffer,
+                        result.append(
+                            &mut (0usize..src.spec().channels.count())
+                                .flat_map(|ch| audio_buffer
+                                    .chan(ch)
+                                    .iter()
+                                    .map(|s| S::from_sample(s.clone()))
+                                    .collect::<Vec<S>>())
+                                .collect::<Vec<S>>()
+                        )
+                    )
+                }
+            }
+            result
+        })
     }
 }