| 1 | use nihav_core::codecs::*; |
| 2 | use nihav_core::io::bitwriter::*; |
| 3 | use nihav_codec_support::codecs::imaadpcm::*; |
| 4 | |
| 5 | #[derive(Default)] |
| 6 | struct ADPCMEncoder { |
| 7 | stream: Option<NAStreamRef>, |
| 8 | samples: Vec<i16>, |
| 9 | flush: bool, |
| 10 | state: [IMAState; 2], |
| 11 | channels: usize, |
| 12 | srate: u32, |
| 13 | pos: u64, |
| 14 | } |
| 15 | |
| 16 | const BLOCK_LEN: usize = 4096; |
| 17 | |
| 18 | impl ADPCMEncoder { |
| 19 | fn new() -> Self { Self::default() } |
| 20 | fn encode_packet(&mut self) -> EncoderResult<NAPacket> { |
| 21 | if self.samples.is_empty() { |
| 22 | return Err(EncoderError::TryAgain); |
| 23 | } |
| 24 | let cur_len = (self.samples.len() / self.channels).min(BLOCK_LEN); |
| 25 | if cur_len < BLOCK_LEN && !self.flush { |
| 26 | return Err(EncoderError::TryAgain); |
| 27 | } |
| 28 | |
| 29 | let bsize = (2 + (16 + 6 + (cur_len - 1) * 4) * self.channels + 7) / 8; |
| 30 | |
| 31 | let mut bw = BitWriter::new(Vec::with_capacity(bsize), BitWriterMode::BE); |
| 32 | |
| 33 | bw.write(2, 2); |
| 34 | |
| 35 | for ch in 0..self.channels { |
| 36 | self.state[ch].predictor = i32::from(self.samples[ch]); |
| 37 | self.state[ch].step = 30; |
| 38 | |
| 39 | bw.write_s(i32::from(self.samples[ch]), 16); |
| 40 | bw.write(self.state[ch].step as u32, 6); |
| 41 | } |
| 42 | |
| 43 | let mut siter = self.samples[self.channels..].iter(); |
| 44 | for _ in 1..cur_len { |
| 45 | for state in self.state[..self.channels].iter_mut() { |
| 46 | let samp = *siter.next().unwrap(); |
| 47 | let nib = state.compress_sample(samp); |
| 48 | state.expand_sample(nib); |
| 49 | bw.write(u32::from(nib), 4); |
| 50 | } |
| 51 | } |
| 52 | |
| 53 | let data = bw.end(); |
| 54 | |
| 55 | self.samples.drain(..cur_len * self.channels); |
| 56 | let ts = NATimeInfo::new(Some(self.pos), None, Some(cur_len as u64), 1, self.srate); |
| 57 | self.pos += cur_len as u64; |
| 58 | Ok(NAPacket::new(self.stream.clone().unwrap(), ts, true, data)) |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | impl NAEncoder for ADPCMEncoder { |
| 63 | fn negotiate_format(&self, encinfo: &EncodeParameters) -> EncoderResult<EncodeParameters> { |
| 64 | match encinfo.format { |
| 65 | NACodecTypeInfo::None => { |
| 66 | Ok(EncodeParameters { |
| 67 | format: NACodecTypeInfo::Audio(NAAudioInfo::new(0, 1, SND_S16_FORMAT, BLOCK_LEN)), |
| 68 | ..Default::default() }) |
| 69 | }, |
| 70 | NACodecTypeInfo::Video(_) => Err(EncoderError::FormatError), |
| 71 | NACodecTypeInfo::Audio(ainfo) => { |
| 72 | let mut outinfo = ainfo; |
| 73 | outinfo.channels = outinfo.channels.max(1).min(2); |
| 74 | if outinfo.format != SND_S16P_FORMAT && outinfo.format != SND_S16_FORMAT { |
| 75 | outinfo.format = SND_S16_FORMAT; |
| 76 | } |
| 77 | outinfo.block_len = BLOCK_LEN; |
| 78 | let mut ofmt = *encinfo; |
| 79 | ofmt.format = NACodecTypeInfo::Audio(outinfo); |
| 80 | Ok(ofmt) |
| 81 | } |
| 82 | } |
| 83 | } |
| 84 | fn get_capabilities(&self) -> u64 { ENC_CAPS_CBR } |
| 85 | fn init(&mut self, stream_id: u32, encinfo: EncodeParameters) -> EncoderResult<NAStreamRef> { |
| 86 | match encinfo.format { |
| 87 | NACodecTypeInfo::None => Err(EncoderError::FormatError), |
| 88 | NACodecTypeInfo::Video(_) => Err(EncoderError::FormatError), |
| 89 | NACodecTypeInfo::Audio(ainfo) => { |
| 90 | if ainfo.format != SND_S16P_FORMAT && ainfo.format != SND_S16_FORMAT { |
| 91 | return Err(EncoderError::FormatError); |
| 92 | } |
| 93 | if ainfo.channels != 1 && ainfo.channels != 2 { |
| 94 | return Err(EncoderError::FormatError); |
| 95 | } |
| 96 | self.channels = ainfo.channels as usize; |
| 97 | |
| 98 | let soniton = NASoniton::new(4, 0); |
| 99 | let out_ainfo = NAAudioInfo::new(ainfo.sample_rate, ainfo.channels, soniton, if self.channels == 1 { 2051 } else { 4101 }); |
| 100 | let info = NACodecInfo::new("flv-adpcm", NACodecTypeInfo::Audio(out_ainfo), None); |
| 101 | let mut stream = NAStream::new(StreamType::Audio, stream_id, info, 1, ainfo.sample_rate, 0); |
| 102 | stream.set_num(stream_id as usize); |
| 103 | let stream = stream.into_ref(); |
| 104 | |
| 105 | self.stream = Some(stream.clone()); |
| 106 | self.samples = Vec::with_capacity(BLOCK_LEN * self.channels); |
| 107 | self.srate = ainfo.sample_rate; |
| 108 | self.flush = false; |
| 109 | |
| 110 | Ok(stream) |
| 111 | }, |
| 112 | } |
| 113 | } |
| 114 | fn encode(&mut self, frm: &NAFrame) -> EncoderResult<()> { |
| 115 | let buf = frm.get_buffer(); |
| 116 | if let Some(ref abuf) = buf.get_abuf_i16() { |
| 117 | let src = abuf.get_data(); |
| 118 | let len = abuf.get_length(); |
| 119 | let ch = abuf.get_chmap().num_channels(); |
| 120 | if abuf.get_step() > 1 || ch == 1 { |
| 121 | self.samples.extend_from_slice(&src[..len * ch]); |
| 122 | } else { |
| 123 | let astride = abuf.get_stride(); |
| 124 | self.samples.reserve(len * ch); |
| 125 | for i in 0..len { |
| 126 | for ch in 0..self.channels { |
| 127 | self.samples.push(src[ch * astride + i]); |
| 128 | } |
| 129 | } |
| 130 | } |
| 131 | Ok(()) |
| 132 | } else { |
| 133 | Err(EncoderError::InvalidParameters) |
| 134 | } |
| 135 | } |
| 136 | fn get_packet(&mut self) -> EncoderResult<Option<NAPacket>> { |
| 137 | if let Ok(pkt) = self.encode_packet() { |
| 138 | Ok(Some(pkt)) |
| 139 | } else { |
| 140 | Ok(None) |
| 141 | } |
| 142 | } |
| 143 | fn flush(&mut self) -> EncoderResult<()> { |
| 144 | self.flush = true; |
| 145 | Ok(()) |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | impl NAOptionHandler for ADPCMEncoder { |
| 150 | fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] } |
| 151 | fn set_options(&mut self, _options: &[NAOption]) {} |
| 152 | fn query_option_value(&self, _name: &str) -> Option<NAValue> { None } |
| 153 | } |
| 154 | |
| 155 | pub fn get_encoder() -> Box<dyn NAEncoder + Send> { |
| 156 | Box::new(ADPCMEncoder::new()) |
| 157 | } |
| 158 | |
| 159 | #[cfg(test)] |
| 160 | mod test { |
| 161 | use nihav_core::codecs::*; |
| 162 | use nihav_core::demuxers::*; |
| 163 | use nihav_core::muxers::*; |
| 164 | use nihav_codec_support::test::enc_video::*; |
| 165 | use crate::*; |
| 166 | |
| 167 | #[test] |
| 168 | fn test_flv_adpcm_encoder() { |
| 169 | |
| 170 | let mut dmx_reg = RegisteredDemuxers::new(); |
| 171 | flash_register_all_demuxers(&mut dmx_reg); |
| 172 | let mut dec_reg = RegisteredDecoders::new(); |
| 173 | flash_register_all_decoders(&mut dec_reg); |
| 174 | let mut mux_reg = RegisteredMuxers::new(); |
| 175 | flash_register_all_muxers(&mut mux_reg); |
| 176 | let mut enc_reg = RegisteredEncoders::new(); |
| 177 | flash_register_all_encoders(&mut enc_reg); |
| 178 | |
| 179 | // sample: https://samples.mplayerhq.hu/FLV/flash_flv_adpcm_testfiles/mono_11k.flv |
| 180 | let dec_config = DecoderTestParams { |
| 181 | demuxer: "flv", |
| 182 | in_name: "assets/Flash/mono_11k.flv", |
| 183 | stream_type: StreamType::Audio, |
| 184 | limit: Some(3700), |
| 185 | dmx_reg, dec_reg, |
| 186 | }; |
| 187 | let enc_config = EncoderTestParams { |
| 188 | muxer: "flv", |
| 189 | enc_name: "flv-adpcm", |
| 190 | out_name: "flv_adpcm.flv", |
| 191 | mux_reg, enc_reg, |
| 192 | }; |
| 193 | let dst_ainfo = NAAudioInfo { |
| 194 | sample_rate: 0, |
| 195 | channels: 0, |
| 196 | format: SND_S16_FORMAT, |
| 197 | block_len: 128, |
| 198 | }; |
| 199 | let enc_params = EncodeParameters { |
| 200 | format: NACodecTypeInfo::Audio(dst_ainfo), |
| 201 | quality: 0, |
| 202 | bitrate: 0, |
| 203 | tb_num: 0, |
| 204 | tb_den: 0, |
| 205 | flags: 0, |
| 206 | }; |
| 207 | //test_encoding_to_file(&dec_config, &enc_config, enc_params, &[]); |
| 208 | |
| 209 | test_encoding_md5(&dec_config, &enc_config, enc_params, &[], |
| 210 | &[0x6114b7de, 0xb84c226f, 0x0caab8e5, 0x2c7df63f]); |
| 211 | } |
| 212 | } |