X-Git-Url: https://git.nihav.org/?a=blobdiff_plain;f=nihav-ms%2Fsrc%2Fcodecs%2Fimaadpcm.rs;fp=nihav-ms%2Fsrc%2Fcodecs%2Fimaadpcm.rs;h=42730ee607feeb38b353754d2bffcb727a8ea2a7;hb=4abcd84283e5d7168cc495e41cbc443710bfbd5e;hp=0000000000000000000000000000000000000000;hpb=f8d697207ac1373091df74002bdc72fd5b2d8944;p=nihav.git

diff --git a/nihav-ms/src/codecs/imaadpcm.rs b/nihav-ms/src/codecs/imaadpcm.rs
new file mode 100644
index 0000000..42730ee
--- /dev/null
+++ b/nihav-ms/src/codecs/imaadpcm.rs
@@ -0,0 +1,106 @@
+use nihav_core::codecs::*;
+use nihav_core::io::byteio::*;
+use nihav_codec_support::codecs::imaadpcm::*;
+use std::str::FromStr;
+
+struct IMAADPCMDecoder {
+    ainfo:      NAAudioInfo,
+    chmap:      NAChannelMap,
+    ch_state:   [IMAState; 2],
+    block_len:  usize,
+}
+
+impl IMAADPCMDecoder {
+    fn new() -> Self {
+        Self {
+            ainfo:      NAAudioInfo::new(0, 1, SND_S16P_FORMAT, 0),
+            chmap:      NAChannelMap::new(),
+            ch_state:   [IMAState::new(), IMAState::new()],
+            block_len:  0,
+        }
+    }
+}
+
+impl NADecoder for IMAADPCMDecoder {
+    fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
+        if let NACodecTypeInfo::Audio(ainfo) = info.get_properties() {
+            self.block_len = ainfo.get_block_len();
+            let channels = ainfo.get_channels() as usize;
+            validate!(channels == 2 || channels == 1);
+            validate!(self.block_len >= 8 * channels);
+            validate!((self.block_len & 3) == 0);
+            let len = (self.block_len / channels - 4) * 2 + 1;
+            self.ainfo = NAAudioInfo::new(ainfo.get_sample_rate(), channels as u8, SND_S16P_FORMAT, len);
+            self.chmap = NAChannelMap::from_str(if channels == 1 { "C" } else { "L,R" }).unwrap();
+            Ok(())
+        } else {
+            Err(DecoderError::InvalidData)
+        }
+    }
+    fn decode(&mut self, _supp: &mut NADecoderSupport, pkt: &NAPacket) -> DecoderResult<NAFrameRef> {
+        let info = pkt.get_stream().get_info();
+        if let NACodecTypeInfo::Audio(_) = info.get_properties() {
+            let pktbuf = pkt.get_buffer();
+            let channels = self.chmap.num_channels();
+            validate!(pktbuf.len() >= 8 * channels);
+            let nsamples = (pktbuf.len() / channels - 4) * 2 + 1;
+            let abuf = alloc_audio_buffer(self.ainfo, nsamples, self.chmap.clone())?;
+            let mut adata = abuf.get_abuf_i16().unwrap();
+            let mut off = [adata.get_offset(0), adata.get_offset(1)];
+            let dst = adata.get_data_mut().unwrap();
+
+            let mut mr = MemoryReader::new_read(pktbuf.as_slice());
+            let mut br = ByteReader::new(&mut mr);
+            for ch in 0..channels {
+                let pred                        = br.read_u16le()? as i16;
+                let step                        = br.read_byte()?;
+                                                  br.read_skip(1)?;
+                validate!(step <= IMA_MAX_STEP);
+                self.ch_state[ch].reset(pred, step);
+                dst[off[ch]] = pred;
+                off[ch] += 1;
+            }
+            while br.left() > 0 {
+                for ch in 0..channels {
+                    let mut cw                  = br.read_u32le()?;
+                    for _ in 0..8 {
+                        dst[off[ch]] = self.ch_state[ch].expand_sample((cw & 0xF) as u8);
+                        off[ch] += 1;
+                        cw >>= 4;
+                    }
+                }
+            }
+            let mut frm = NAFrame::new_from_pkt(pkt, info.replace_info(NACodecTypeInfo::Audio(self.ainfo)), abuf);
+            frm.set_duration(Some(nsamples as u64));
+            frm.set_keyframe(false);
+            Ok(frm.into_ref())
+        } else {
+            Err(DecoderError::InvalidData)
+        }
+    }
+    fn flush(&mut self) {
+    }
+}
+
+pub fn get_decoder() -> Box<dyn NADecoder + Send> {
+    Box::new(IMAADPCMDecoder::new())
+}
+
+#[cfg(test)]
+mod test {
+    use nihav_core::codecs::RegisteredDecoders;
+    use nihav_core::demuxers::RegisteredDemuxers;
+    use nihav_codec_support::test::dec_video::*;
+    use crate::ms_register_all_codecs;
+    use nihav_commonfmt::generic_register_all_demuxers;
+    #[test]
+    fn test_ima_adpcm_ms() {
+        let mut dmx_reg = RegisteredDemuxers::new();
+        generic_register_all_demuxers(&mut dmx_reg);
+        let mut dec_reg = RegisteredDecoders::new();
+        ms_register_all_codecs(&mut dec_reg);
+
+        test_decoding("avi", "ima-adpcm-ms", "assets/MS/IMAG0006.AVI", None, &dmx_reg, &dec_reg,
+                      ExpectedTestResult::MD5([0x0cdc640f, 0xb00df235, 0x1ec4a280, 0x065b5e9e]));
+    }
+}