use nihav_core::formats::*;
use nihav_core::codecs::*;
+use nihav_core::io::byteio::*;
-struct PCMDecoder { chmap: NAChannelMap }
+#[derive(Clone,Copy,Debug,PartialEq)]
+enum PCMMode {
+ Infinity,
+ ALaw,
+ MuLaw,
+}
+
+struct PCMDecoder {
+ chmap: NAChannelMap,
+ mode: PCMMode,
+}
+
+fn cvt_alaw(val: u8) -> i16 {
+ let val = val ^ 0x55;
+ let sign = (val & 0x80) != 0;
+ let exp = ((val >> 4) & 7) + 4;
+ let mant = (val & 0xF) + if exp != 0 { 16 } else { 0 };
+ let aval = i16::from(mant) << exp;
+ if sign { aval } else { -aval }
+}
+
+fn cvt_mulaw(val: u8) -> i16 {
+ let val = !val;
+ let sign = (val & 0x80) != 0;
+ let exp = ((val >> 4) & 7) + 3;
+ let mant = (val & 0xF) | 0x10;
+ let aval = (i16::from(mant) << exp) - 128 - 4;
+ if !sign { aval } else { -aval }
+}
impl PCMDecoder {
- fn new() -> Self {
- PCMDecoder { chmap: NAChannelMap::new() }
+ fn new(mode: PCMMode) -> Self {
+ PCMDecoder { chmap: NAChannelMap::new(), mode }
+ }
+ fn decode_xlaw(&self, pkt: &NAPacket, duration: u64, srate: u32) -> DecoderResult<NAFrameRef> {
+ let pktbuf = pkt.get_buffer();
+ let channels = self.chmap.num_channels();
+ let abuf = alloc_audio_buffer(NAAudioInfo::new(srate, channels as u8, SND_S16_FORMAT, 1), duration as usize, self.chmap.clone())?;
+ let mut buf = abuf.get_abuf_i16().unwrap();
+ let dst = buf.get_data_mut().unwrap();
+ for (src, dst) in pktbuf.chunks(channels).zip(dst.chunks_mut(channels)) {
+ for (isamp, dsamp) in src.iter().zip(dst.iter_mut()) {
+ *dsamp = if self.mode == PCMMode::ALaw { cvt_alaw(*isamp) } else { cvt_mulaw(*isamp) };
+ }
+ }
+ let info = pkt.get_stream().get_info();
+ let mut frm = NAFrame::new_from_pkt(pkt, info, abuf);
+ frm.set_duration(Some(duration));
+ frm.set_keyframe(true);
+ Ok(frm.into_ref())
}
}
let info = pkt.get_stream().get_info();
if let NACodecTypeInfo::Audio(ainfo) = info.get_properties() {
let duration = get_duration(&ainfo, pkt.get_duration(), pkt.get_buffer().len());
+ if self.mode != PCMMode::Infinity {
+ return self.decode_xlaw(pkt, duration, ainfo.sample_rate);
+ }
let pktbuf = pkt.get_buffer();
let abuf = NAAudioBuffer::new_from_buf(ainfo, pktbuf, self.chmap.clone());
let mut frm = NAFrame::new_from_pkt(pkt, info, NABufferType::AudioPacked(abuf));
}
}
-pub fn get_decoder() -> Box<dyn NADecoder> {
- Box::new(PCMDecoder::new())
+impl NAOptionHandler for PCMDecoder {
+ fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] }
+ fn set_options(&mut self, _options: &[NAOption]) { }
+ fn query_option_value(&self, _name: &str) -> Option<NAValue> { None }
+}
+
+pub fn get_decoder() -> Box<dyn NADecoder + Send> {
+ Box::new(PCMDecoder::new(PCMMode::Infinity))
+}
+
+pub fn get_a_law_decoder() -> Box<dyn NADecoder + Send> {
+ Box::new(PCMDecoder::new(PCMMode::ALaw))
+}
+
+pub fn get_mu_law_decoder() -> Box<dyn NADecoder + Send> {
+ Box::new(PCMDecoder::new(PCMMode::MuLaw))
+}
+
+struct PCMEncoder {
+ stream: Option<NAStreamRef>,
+ pkt: Option<NAPacket>,
+}
+
+impl PCMEncoder {
+ fn new() -> Self {
+ PCMEncoder {
+ stream: None,
+ pkt: None,
+ }
+ }
+}
+
+macro_rules! write_buffer {
+ ($abuf: expr, $dvec: expr, $write_be: ident, $write_le: ident, $dtype: tt) => {
+ let info = $abuf.get_info();
+ let len = $abuf.get_length();
+ let data = $abuf.get_data();
+ let channels = $abuf.get_chmap().num_channels();
+ let stride = $abuf.get_stride();
+ let step = $abuf.get_step();
+ let is_be = info.format.be;
+
+ $dvec = vec![0u8; len * channels * std::mem::size_of::<$dtype>()];
+ let mut mw = MemoryWriter::new_write($dvec.as_mut_slice());
+ let mut bw = ByteWriter::new(&mut mw);
+ for off in 0..len {
+ for j in 0..channels {
+ if is_be {
+ bw.$write_be(data[off * step + j * stride] as $dtype).unwrap();
+ } else {
+ bw.$write_le(data[off * step + j * stride] as $dtype).unwrap();
+ }
+ }
+ }
+ }
+}
+
+impl NAEncoder for PCMEncoder {
+ fn negotiate_format(&self, encinfo: &EncodeParameters) -> EncoderResult<EncodeParameters> {
+ match encinfo.format {
+ NACodecTypeInfo::None => {
+ let mut ofmt = EncodeParameters::default();
+ ofmt.format = NACodecTypeInfo::Audio(NAAudioInfo::new(0, 0, SND_S16P_FORMAT, 0));
+ Ok(ofmt)
+ },
+ NACodecTypeInfo::Video(_) => Err(EncoderError::FormatError),
+ NACodecTypeInfo::Audio(_) => {
+ Ok(*encinfo)
+ }
+ }
+ }
+ fn init(&mut self, stream_id: u32, encinfo: EncodeParameters) -> EncoderResult<NAStreamRef> {
+ match encinfo.format {
+ NACodecTypeInfo::None => Err(EncoderError::FormatError),
+ NACodecTypeInfo::Video(_) => Err(EncoderError::FormatError),
+ NACodecTypeInfo::Audio(_) => {
+ let info = NACodecInfo::new("pcm", encinfo.format, None);
+ let mut stream = NAStream::new(StreamType::Audio, stream_id, info, encinfo.tb_num, encinfo.tb_den, 0);
+ stream.set_num(stream_id as usize);
+ let stream = stream.into_ref();
+ self.stream = Some(stream.clone());
+ Ok(stream)
+ }
+ }
+ }
+ fn encode(&mut self, frm: &NAFrame) -> EncoderResult<()> {
+ let buf = frm.get_buffer();
+ let mut dbuf;
+ match buf {
+ NABufferType::AudioU8(ref abuf) => {
+ let stride = abuf.get_stride();
+ if stride == 1 { // packed already
+ self.pkt = Some(NAPacket::new_from_refbuf(self.stream.clone().unwrap(), frm.ts, true, abuf.get_data_ref()));
+ return Ok(());
+ }
+ let len = abuf.get_length();
+ let data = abuf.get_data();
+ let channels = abuf.get_chmap().num_channels();
+ dbuf = Vec::with_capacity(len * channels);
+ for off in 0..len {
+ for j in 0..channels {
+ dbuf.push(data[off + j * stride]);
+ }
+ }
+ },
+ NABufferType::AudioI16(ref abuf) => {
+ write_buffer!(abuf, dbuf, write_u16be, write_u16le, u16);
+ },
+ NABufferType::AudioI32(ref abuf) => {
+ write_buffer!(abuf, dbuf, write_u32be, write_u32le, u32);
+ },
+ NABufferType::AudioF32(ref abuf) => {
+ write_buffer!(abuf, dbuf, write_f32be, write_f32le, f32);
+ },
+ NABufferType::AudioPacked(ref abuf) => {
+ self.pkt = Some(NAPacket::new_from_refbuf(self.stream.clone().unwrap(), frm.ts, true, abuf.get_data_ref()));
+ return Ok(());
+ },
+ NABufferType::None => {
+ self.pkt = None;
+ return Ok(());
+ },
+ _ => return Err(EncoderError::FormatError),
+ };
+ self.pkt = Some(NAPacket::new(self.stream.clone().unwrap(), frm.ts, true, dbuf));
+ Ok(())
+ }
+ fn get_packet(&mut self) -> EncoderResult<Option<NAPacket>> {
+ let mut npkt = None;
+ std::mem::swap(&mut self.pkt, &mut npkt);
+ Ok(npkt)
+ }
+ fn flush(&mut self) -> EncoderResult<()> {
+ Ok(())
+ }
+}
+
+impl NAOptionHandler for PCMEncoder {
+ fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] }
+ fn set_options(&mut self, _options: &[NAOption]) { }
+ fn query_option_value(&self, _name: &str) -> Option<NAValue> { None }
+}
+
+pub fn get_encoder() -> Box<dyn NAEncoder + Send> {
+ Box::new(PCMEncoder::new())
}
projects / nihav.git / blobdiff