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use nihav_core::codecs::*;
use nihav_core::io::bitwriter::*;
use nihav_codec_support::codecs::imaadpcm::*;
#[derive(Default)]
struct ADPCMEncoder {
stream: Option<NAStreamRef>,
samples: Vec<i16>,
flush: bool,
state: [IMAState; 2],
channels: usize,
srate: u32,
pos: u64,
}
const BLOCK_LEN: usize = 4096;
impl ADPCMEncoder {
fn new() -> Self { Self::default() }
fn encode_packet(&mut self) -> EncoderResult<NAPacket> {
if self.samples.is_empty() {
return Err(EncoderError::TryAgain);
}
let cur_len = (self.samples.len() / self.channels).min(BLOCK_LEN);
if cur_len < BLOCK_LEN && !self.flush {
return Err(EncoderError::TryAgain);
}
let bsize = (2 + (16 + 6 + (cur_len - 1) * 4) * self.channels + 7) / 8;
let mut bw = BitWriter::new(Vec::with_capacity(bsize), BitWriterMode::BE);
bw.write(2, 2);
for ch in 0..self.channels {
self.state[ch].predictor = i32::from(self.samples[ch]);
self.state[ch].step = 30;
bw.write_s(i32::from(self.samples[ch]), 16);
bw.write(self.state[ch].step as u32, 6);
}
let mut siter = self.samples[self.channels..].iter();
for _ in 1..cur_len {
for state in self.state[..self.channels].iter_mut() {
let samp = *siter.next().unwrap();
let nib = state.compress_sample(samp);
state.expand_sample(nib);
bw.write(u32::from(nib), 4);
}
}
let data = bw.end();
self.samples.drain(..cur_len * self.channels);
let ts = NATimeInfo::new(Some(self.pos), None, Some(cur_len as u64), 1, self.srate);
self.pos += cur_len as u64;
Ok(NAPacket::new(self.stream.clone().unwrap(), ts, true, data))
}
}
impl NAEncoder for ADPCMEncoder {
fn negotiate_format(&self, encinfo: &EncodeParameters) -> EncoderResult<EncodeParameters> {
match encinfo.format {
NACodecTypeInfo::None => {
Ok(EncodeParameters {
format: NACodecTypeInfo::Audio(NAAudioInfo::new(0, 1, SND_S16_FORMAT, BLOCK_LEN)),
..Default::default() })
},
NACodecTypeInfo::Video(_) => Err(EncoderError::FormatError),
NACodecTypeInfo::Audio(ainfo) => {
let mut outinfo = ainfo;
outinfo.channels = outinfo.channels.max(1).min(2);
if outinfo.format != SND_S16P_FORMAT && outinfo.format != SND_S16_FORMAT {
outinfo.format = SND_S16_FORMAT;
}
outinfo.block_len = BLOCK_LEN;
let mut ofmt = *encinfo;
ofmt.format = NACodecTypeInfo::Audio(outinfo);
Ok(ofmt)
}
}
}
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(ainfo) => {
if ainfo.format != SND_S16P_FORMAT && ainfo.format != SND_S16_FORMAT {
return Err(EncoderError::FormatError);
}
if ainfo.channels != 1 && ainfo.channels != 2 {
return Err(EncoderError::FormatError);
}
self.channels = ainfo.channels as usize;
let soniton = NASoniton::new(4, 0);
let out_ainfo = NAAudioInfo::new(ainfo.sample_rate, ainfo.channels, soniton, if self.channels == 1 { 2051 } else { 4101 });
let info = NACodecInfo::new("flv-adpcm", NACodecTypeInfo::Audio(out_ainfo), None);
let mut stream = NAStream::new(StreamType::Audio, stream_id, info, 1, ainfo.sample_rate, 0);
stream.set_num(stream_id as usize);
let stream = stream.into_ref();
self.stream = Some(stream.clone());
self.samples = Vec::with_capacity(BLOCK_LEN * self.channels);
self.srate = ainfo.sample_rate;
self.flush = false;
Ok(stream)
},
}
}
fn encode(&mut self, frm: &NAFrame) -> EncoderResult<()> {
let buf = frm.get_buffer();
if let Some(ref abuf) = buf.get_abuf_i16() {
let src = abuf.get_data();
let len = abuf.get_length();
let ch = abuf.get_chmap().num_channels();
if abuf.get_step() > 1 || ch == 1 {
self.samples.extend_from_slice(&src[..len * ch]);
} else {
let astride = abuf.get_stride();
self.samples.reserve(len * ch);
for i in 0..len {
for ch in 0..self.channels {
self.samples.push(src[ch * astride + i]);
}
}
}
Ok(())
} else {
Err(EncoderError::InvalidParameters)
}
}
fn get_packet(&mut self) -> EncoderResult<Option<NAPacket>> {
if let Ok(pkt) = self.encode_packet() {
Ok(Some(pkt))
} else {
Ok(None)
}
}
fn flush(&mut self) -> EncoderResult<()> {
self.flush = true;
Ok(())
}
}
impl NAOptionHandler for ADPCMEncoder {
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(ADPCMEncoder::new())
}
#[cfg(test)]
mod test {
use nihav_core::codecs::*;
use nihav_core::demuxers::*;
use nihav_core::muxers::*;
use nihav_codec_support::test::enc_video::*;
use crate::*;
#[test]
fn test_flv_adpcm_encoder() {
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);
let mut mux_reg = RegisteredMuxers::new();
flash_register_all_muxers(&mut mux_reg);
let mut enc_reg = RegisteredEncoders::new();
flash_register_all_encoders(&mut enc_reg);
// sample: https://samples.mplayerhq.hu/FLV/flash_flv_adpcm_testfiles/mono_11k.flv
let dec_config = DecoderTestParams {
demuxer: "flv",
in_name: "assets/Flash/mono_11k.flv",
stream_type: StreamType::Audio,
limit: Some(3700),
dmx_reg, dec_reg,
};
let enc_config = EncoderTestParams {
muxer: "flv",
enc_name: "flv-adpcm",
out_name: "flv_adpcm.flv",
mux_reg, enc_reg,
};
let dst_ainfo = NAAudioInfo {
sample_rate: 0,
channels: 0,
format: SND_S16_FORMAT,
block_len: 128,
};
let enc_params = EncodeParameters {
format: NACodecTypeInfo::Audio(dst_ainfo),
quality: 0,
bitrate: 0,
tb_num: 0,
tb_den: 0,
flags: 0,
};
//test_encoding_to_file(&dec_config, &enc_config, enc_params, &[]);
test_encoding_md5(&dec_config, &enc_config, enc_params, &[],
&[0x6114b7de, 0xb84c226f, 0x0caab8e5, 0x2c7df63f]);
}
}
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