--- /dev/null
+use nihav_core::codecs::*;
+use nihav_core::io::bitreader::*;
+use nihav_codec_support::dsp::mdct::*;
+use nihav_codec_support::dsp::window::*;
+
+struct Random { state: u32 }
+
+impl Random {
+ fn new(seed: u32) -> Self { Self { state: seed } }
+ fn next(&mut self) -> u32 {
+ self.state ^= self.state << 13;
+ self.state ^= self.state >> 17;
+ self.state ^= self.state << 5;
+ self.state
+ }
+}
+
+const NUM_BANDS: usize = 23;
+const BLOCK_LEN: usize = 256;
+const PACKED_BLK_LEN: usize = 64;
+const CODED_LEN: usize = 124;
+
+struct ASAODecoder {
+ ainfo: NAAudioInfo,
+ chmap: NAChannelMap,
+ window: [f32; 128],
+ imdct: IMDCT,
+ rng: Random,
+
+ scales: [f32; 128],
+ iscales: [i32; 128],
+ bits: [i8; 128],
+ coeffs: [f32; 128],
+ prev: [f32; 128],
+ tmp: [f32; 128],
+}
+
+const HEADER_BITS: u32 = 116;
+const SUBPART_BITS: i32 = (((PACKED_BLK_LEN as u32) * 8 - HEADER_BITS) / 2) as i32;
+const MAX_CBITS: i32 = 6;
+const BASE_OFF: i32 = 4228;
+const BASE_SHIFT: i8 = 19;
+
+trait SignedShift {
+ type Output;
+ fn sshift(self, shift: i8) -> Self::Output;
+}
+
+impl SignedShift for i32 {
+ type Output = Self;
+ fn sshift(self, shift: i8) -> Self::Output {
+ if shift >= 0 {
+ self << shift
+ } else {
+ self >> -shift
+ }
+ }
+}
+
+fn norm(val: &mut i32) -> i8 {
+ if *val == 0 {
+ 31
+ } else {
+ let shift = val.abs().leading_zeros() - 1;
+ *val <<= shift;
+ shift as i8
+ }
+}
+
+fn sum_bits(src: &[i32; 128], shift: i8, off: i32) -> i32 {
+ let mut sum = 0;
+ for &el in src[..CODED_LEN].iter() {
+ let val = (((el - off) >> (shift - 1)) + 1) >> 1;
+ sum += val.max(0).min(MAX_CBITS);
+ }
+ sum
+}
+
+fn bitalloc(bits: &mut [i8; 128], scales: &[i32; 128]) {
+ let mut max = scales[..CODED_LEN].iter().fold(scales[0], |v, &x| v.max(x));
+ let mut shift = norm(&mut max) - 16;
+
+ let mut tmp = [0; 128];
+ let mut sum = 0;
+ for i in 0..CODED_LEN {
+ tmp[i] = (scales[i].sshift(shift) * 3) >> 2;
+ sum += tmp[i];
+ }
+
+ shift += 11;
+ let ref_shift = shift;
+
+ sum -= SUBPART_BITS << shift;
+ shift += norm(&mut sum);
+ shift = ref_shift - (BASE_SHIFT + shift - 31);
+ let mut offset = ((BASE_OFF * (sum >> 16)) >> 15).sshift(shift);
+
+ let mut bitsum = sum_bits(&tmp, ref_shift, offset);
+
+ if bitsum != SUBPART_BITS {
+ let mut off2 = bitsum - SUBPART_BITS;
+ shift = 0;
+ while off2.abs() <= 0x3FFF {
+ off2 <<= 1;
+ shift += 1;
+ }
+
+ shift = ref_shift - (BASE_SHIFT + shift - 15);
+ off2 = ((BASE_OFF * off2) >> 15).sshift(shift);
+
+ let mut last_off = 0;
+ let mut last_bitsum = 0;
+ let mut iter = 1;
+ while iter < 20 {
+ last_off = offset;
+ offset += off2;
+ last_bitsum = bitsum;
+ bitsum = sum_bits(&tmp, ref_shift, offset);
+ if (bitsum - SUBPART_BITS) * (last_bitsum - SUBPART_BITS) <= 0 {
+ break;
+ }
+ iter += 1;
+ }
+
+ let (mut big_off, mut small_off, mut big_sum, mut small_sum) = if bitsum > SUBPART_BITS {
+ (offset, last_off, bitsum, last_bitsum)
+ } else {
+ (last_off, offset, last_bitsum, bitsum)
+ };
+
+ while bitsum != SUBPART_BITS && iter < 20 {
+ let off = (big_off + small_off) >> 1;
+ bitsum = sum_bits(&tmp, ref_shift, off);
+ if bitsum > SUBPART_BITS {
+ big_off = off;
+ big_sum = bitsum;
+ } else {
+ small_off = off;
+ small_sum = bitsum;
+ }
+ iter += 1;
+ }
+
+ if (big_sum - SUBPART_BITS).abs() >= (small_sum - SUBPART_BITS).abs() {
+ offset = small_off;
+ bitsum = small_sum;
+ } else {
+ offset = big_off;
+ bitsum = big_sum;
+ }
+ }
+
+ for (bits, &val) in bits.iter_mut().zip(tmp.iter()).take(CODED_LEN) {
+ *bits = ((((val - offset) >> (ref_shift - 1)) + 1) >> 1).max(0).min(MAX_CBITS) as i8;
+ }
+ if bitsum > SUBPART_BITS {
+ let mut sum = 0;
+ let mut i = 0;
+ while sum < SUBPART_BITS {
+ sum += i32::from(bits[i]);
+ i += 1;
+ }
+ bits[i - 1] -= (sum - SUBPART_BITS) as i8;
+ while i < CODED_LEN {
+ bits[i] = 0;
+ i += 1;
+ }
+ }
+}
+
+fn overlap_add(dst: &mut [f32], src: &[f32; 128], prev: &[f32; 128], window: &[f32; 128]) {
+ for i in 0..64 {
+ let p = prev[64 + i];
+ let s = src [63 - i];
+ let w0 = window[i];
+ let w1 = window[127 - i];
+ dst[i] = p * w1 - s * w0;
+ dst[127 - i] = p * w0 + s * w1;
+ }
+}
+
+impl ASAODecoder {
+ fn new() -> Self {
+ let mut window = [0.0; 128];
+ generate_window(WindowType::Sine, 1.0/1024.0, 128, true, &mut window);
+
+ Self {
+ ainfo: NAAudioInfo::new(0, 1, SND_F32P_FORMAT, BLOCK_LEN),
+ chmap: NAChannelMap::new(),
+ window,
+ imdct: IMDCT::new(256, true),
+ rng: Random::new(42),
+
+ scales: [0.0; 128],
+ iscales: [0; 128],
+ bits: [0; 128],
+ coeffs: [0.0; 128],
+ prev: [0.0; 128],
+ tmp: [0.0; 128],
+ }
+ }
+ fn decode_block(&mut self, br: &mut BitReader, dst: &mut [f32]) -> DecoderResult<()> {
+ let mut scale = i32::from(SCALE[br.read(6)? as usize]);
+ let mut sc_iter = self.scales.iter_mut();
+ let mut isc_iter = self.iscales.iter_mut();
+ for (band, &band_size) in BAND_SIZES.iter().enumerate() {
+ if band > 0 {
+ scale += i32::from(SCALE_DIFF[br.read(5)? as usize]);
+ }
+ let scf = -(2.0f32.powf((scale as f32) / 2048.0));
+ for _ in 0..band_size {
+ *sc_iter.next().unwrap() = scf;
+ *isc_iter.next().unwrap() = scale;
+ }
+ }
+
+ bitalloc(&mut self.bits, &self.iscales);
+
+ let mut coeffs = &mut self.coeffs;
+ let mut prev = &mut self.prev;
+ for (i, out) in dst.chunks_exact_mut(BLOCK_LEN / 2).take(2).enumerate() {
+ br.seek(HEADER_BITS + (SUBPART_BITS as u32) * (i as u32))?;
+ for j in 0..CODED_LEN {
+ if self.bits[j] <= 0 {
+ self.tmp[j] = std::f32::consts::FRAC_1_SQRT_2;
+ if (self.rng.next() & 1) != 0 {
+ self.tmp[j] = -self.tmp[j];
+ }
+ } else {
+ let val = br.read(self.bits[j] as u8)? as usize;
+ self.tmp[j] = QUANT_VALS[self.bits[j] as usize][val];
+ }
+ self.tmp[j] *= self.scales[j];
+ }
+ for j in CODED_LEN..128 {
+ self.tmp[j] = 0.0;
+ }
+ self.imdct.imdct_half(&self.tmp, coeffs);
+ overlap_add(out, coeffs, prev, &self.window);
+ std::mem::swap(&mut coeffs, &mut prev);
+ }
+
+ Ok(())
+ }
+}
+
+
+impl NADecoder for ASAODecoder {
+ fn init(&mut self, _supp: &mut NADecoderSupport, info: NACodecInfoRef) -> DecoderResult<()> {
+ if let NACodecTypeInfo::Audio(ainfo) = info.get_properties() {
+ self.ainfo = NAAudioInfo::new(ainfo.get_sample_rate(), 1, SND_F32P_FORMAT, BLOCK_LEN);
+ self.chmap = NAChannelMap::new();
+ self.chmap.add_channel(NAChannelType::C);
+ 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 src = pkt.get_buffer();
+
+ validate!((src.len() % PACKED_BLK_LEN) == 0);
+ let npkts = src.len() / PACKED_BLK_LEN;
+ let nsamples = npkts * BLOCK_LEN;
+ let abuf = alloc_audio_buffer(self.ainfo, nsamples, self.chmap.clone())?;
+ let mut adata = abuf.get_abuf_f32().unwrap();
+ let dst = adata.get_data_mut().unwrap();
+
+ for (src, dst) in src.chunks_exact(PACKED_BLK_LEN).zip(dst.chunks_mut(BLOCK_LEN)) {
+ let mut br = BitReader::new(&src, BitReaderMode::LE);
+ self.decode_block(&mut br, dst)?;
+ }
+
+ 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(true);
+ Ok(frm.into_ref())
+ } else {
+ Err(DecoderError::InvalidData)
+ }
+ }
+ fn flush(&mut self) {
+ }
+}
+
+impl NAOptionHandler for ASAODecoder {
+ 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(ASAODecoder::new())
+}
+
+#[cfg(test)]
+mod test {
+ use nihav_core::codecs::RegisteredDecoders;
+ use nihav_core::demuxers::RegisteredDemuxers;
+ use nihav_codec_support::test::dec_video::*;
+ use crate::flash_register_all_decoders;
+ use crate::flash_register_all_demuxers;
+ #[test]
+ fn test_asao() {
+ let mut dmx_reg = RegisteredDemuxers::new();
+ flash_register_all_demuxers(&mut dmx_reg);
+ let mut dec_reg = RegisteredDecoders::new();
+ flash_register_all_decoders(&mut dec_reg);
+
+ test_decode_audio("flv", "assets/Flash/nellymoser-in-flv.flv", Some(3000), None/*Some("asao")*/, &dmx_reg, &dec_reg);
+ }
+}
+
+#[allow(clippy::excessive_precision)]
+const QUANT_VALS: [&[f32]; 7] = [
+ &[ 0.0000000000 ],
+ &[ -0.8472560048, 0.7224709988 ],
+ &[ -1.5247479677, -0.4531480074, 0.3753609955, 1.4717899561 ],
+ &[ -1.9822579622, -1.1929379702, -0.5829370022, -0.0693780035,
+ 0.3909569979, 0.9069200158, 1.4862740040, 2.2215409279 ],
+ &[ -2.3887870312, -1.8067539930, -1.4105420113, -1.0773609877,
+ -0.7995010018, -0.5558109879, -0.3334020078, -0.1324490011,
+ 0.0568020009, 0.2548770010, 0.4773550034, 0.7386850119,
+ 1.0443060398, 1.3954459429, 1.8098750114, 2.3918759823 ],
+ &[ -2.3893830776, -1.9884680510, -1.7514040470, -1.5643119812,
+ -1.3922129869, -1.2164649963, -1.0469499826, -0.8905100226,
+ -0.7645580173, -0.6454579830, -0.5259280205, -0.4059549868,
+ -0.3029719889, -0.2096900046, -0.1239869967, -0.0479229987,
+ 0.0257730000, 0.1001340002, 0.1737180054, 0.2585540116,
+ 0.3522900045, 0.4569880068, 0.5767750144, 0.7003160119,
+ 0.8425520062, 1.0093879700, 1.1821349859, 1.3534560204,
+ 1.5320819616, 1.7332619429, 1.9722349644, 2.3978140354 ],
+ &[ -2.5756309032, -2.0573320389, -1.8984919786, -1.7727810144,
+ -1.6662600040, -1.5742180347, -1.4993319511, -1.4316639900,
+ -1.3652280569, -1.3000990152, -1.2280930281, -1.1588579416,
+ -1.0921250582, -1.0135740042, -0.9202849865, -0.8287050128,
+ -0.7374889851, -0.6447759867, -0.5590940118, -0.4857139885,
+ -0.4110319912, -0.3459700048, -0.2851159871, -0.2341620028,
+ -0.1870580018, -0.1442500055, -0.1107169986, -0.0739680007,
+ -0.0365610011, -0.0073290002, 0.0203610007, 0.0479039997,
+ 0.0751969963, 0.0980999991, 0.1220389977, 0.1458999962,
+ 0.1694349945, 0.1970459968, 0.2252430022, 0.2556869984,
+ 0.2870100141, 0.3197099864, 0.3525829911, 0.3889069855,
+ 0.4334920049, 0.4769459963, 0.5204820037, 0.5644530058,
+ 0.6122040153, 0.6685929894, 0.7341650128, 0.8032159805,
+ 0.8784040213, 0.9566209912, 1.0397069454, 1.1293770075,
+ 1.2211159468, 1.3080279827, 1.4024800062, 1.5056819916,
+ 1.6227730513, 1.7724959850, 1.9430880547, 2.2903931141 ]
+];
+
+const SCALE_DIFF: [i16; 32] = [
+ -11725, -9420, -7910, -6801, -5948, -5233, -4599, -4039,
+ -3507, -3030, -2596, -2170, -1774, -1383, -1016, -660,
+ -329, -1, 337, 696, 1085, 1512, 1962, 2433,
+ 2968, 3569, 4314, 5279, 6622, 8154, 10076, 12975
+];
+
+const BAND_SIZES: [usize; NUM_BANDS] = [
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 4, 4, 5, 6, 6, 7, 8, 9, 10, 12, 14, 15
+];
+
+const SCALE: [u16; 64] = [
+ 3134, 5342, 6870, 7792, 8569, 9185, 9744, 10191,
+ 10631, 11061, 11434, 11770, 12116, 12513, 12925, 13300,
+ 13674, 14027, 14352, 14716, 15117, 15477, 15824, 16157,
+ 16513, 16804, 17090, 17401, 17679, 17948, 18238, 18520,
+ 18764, 19078, 19381, 19640, 19921, 20205, 20500, 20813,
+ 21162, 21465, 21794, 22137, 22453, 22756, 23067, 23350,
+ 23636, 23926, 24227, 24521, 24819, 25107, 25414, 25730,
+ 26120, 26497, 26895, 27344, 27877, 28463, 29426, 31355
+];
projects / nihav.git / blobdiff