--- /dev/null
+use nihav_core::frame::*;
+use nihav_core::demuxers::*;
+
+struct FLACDemuxer<'a> {
+ src: &'a mut ByteReader<'a>,
+ data_start: u64,
+ tot_samples: u64,
+ cur_samples: u64,
+ blk_samples: u16,
+ min_size: usize,
+ max_size: usize,
+}
+
+impl<'a> FLACDemuxer<'a> {
+ fn new(io: &'a mut ByteReader<'a>) -> Self {
+ Self {
+ src: io,
+ data_start: 0,
+ tot_samples: 0,
+ cur_samples: 0,
+ blk_samples: 0,
+ min_size: 0,
+ max_size: 0,
+ }
+ }
+}
+
+fn update_crc16(crc: u16, byte: u8) -> u16 {
+ (crc << 8) ^ CRC16_TABLE[(((crc >> 8) as u8) ^ byte) as usize]
+}
+
+fn read_utf8(src: &[u8]) -> DemuxerResult<u32> {
+ if (src[0] & 0x80) == 0 {
+ return Ok(u32::from(src[0]));
+ }
+ let len = (!src[0]).leading_zeros() as usize;
+ validate!(len != 1 && len <= 5 && src.len() >= len);
+ let mut val = u32::from(src[0] & 0x1F);
+ for byte in src.iter().take(len).skip(1) {
+ validate!((*byte & 0xC0) == 0x80);
+ val = (val << 6) | u32::from(*byte & 0x3F);
+ }
+ Ok(val)
+}
+
+impl<'a> DemuxCore<'a> for FLACDemuxer<'a> {
+ fn open(&mut self, strmgr: &mut StreamManager, seek_index: &mut SeekIndex) -> DemuxerResult<()> {
+ let tag = self.src.read_tag()?;
+ validate!(&tag == b"fLaC");
+ let mut streaminfo: Vec<u8> = Vec::new();
+ let mut srate = 0u32;
+ let mut channels = 0u8;
+ loop {
+ let id1 = self.src.read_byte()?;
+ let len = self.src.read_u24be()? as usize;
+ let id = id1 & 0x7F;
+
+ match id {
+ 0x00 => {
+ validate!(len >= 34);
+ streaminfo = vec![0u8; len];
+ self.src.read_buf(&mut streaminfo)?;
+ let min_bs = read_u16be(&streaminfo[0..])?;
+ let max_bs = read_u16be(&streaminfo[2..])?;
+ if min_bs == max_bs {
+ self.blk_samples = max_bs;
+ }
+ self.min_size = read_u24be(&streaminfo[4..])? as usize;
+ self.max_size = read_u24be(&streaminfo[7..])? as usize;
+ let word = read_u24be(&streaminfo[10..])?;
+ srate = word >> 4;
+ channels = (((word >> 1) & 7) + 1) as u8;
+ self.tot_samples = (u64::from(streaminfo[13] & 0xF) << 32) | u64::from(read_u32be(&streaminfo[14..])?);
+ },
+ 0x03 => {
+ validate!((len % 18) == 0);
+ seek_index.mode = SeekIndexMode::Present;
+ for _ in 0..len / 18 {
+ let sample = self.src.read_u64be()?;
+ let offset = self.src.read_u64be()?;
+ let _nsamps = self.src.read_u16be()?;
+ let time = sample * 1000 / u64::from(srate.max(1000));
+ seek_index.add_entry(0, SeekEntry { time, pts: sample, pos: offset });
+ }
+ },
+ _ => self.src.read_skip(len)?,
+ };
+
+ if (id1 & 0x80) != 0 {
+ break;
+ }
+ }
+ self.data_start = self.src.tell();
+ validate!(srate != 0);
+
+ let base = if self.blk_samples != 0 { u32::from(self.blk_samples) } else { 1 };
+ let ahdr = NAAudioInfo::new(srate, channels as u8, SND_S16P_FORMAT, base as usize);
+ let ainfo = NACodecInfo::new("flac", NACodecTypeInfo::Audio(ahdr), Some(streaminfo));
+ strmgr.add_stream(NAStream::new(StreamType::Audio, 0, ainfo, base, srate)).unwrap();
+
+ Ok(())
+ }
+ fn get_frame(&mut self, strmgr: &mut StreamManager) -> DemuxerResult<NAPacket> {
+ if self.src.is_eof() || (self.tot_samples != 0 && self.cur_samples == self.tot_samples) { return Err(DemuxerError::EOF); }
+ let mut buf = Vec::with_capacity(self.min_size);
+ let mut crc = 0;
+ for _ in 0..5 {
+ let byte = self.src.read_byte()?;
+ buf.push(byte);
+ crc = update_crc16(crc, byte);
+ }
+ let mut ref_crc = self.src.read_u16be()?;
+ loop {
+ let byte = self.src.read_byte()?;
+ let old_byte = (ref_crc >> 8) as u8;
+ buf.push(old_byte);
+ ref_crc = (ref_crc << 8) | u16::from(byte);
+ crc = update_crc16(crc, old_byte);
+ if buf.len() + 2 >= self.min_size && crc == ref_crc {
+ let ret = self.src.peek_u16be();
+ if ret.is_err() || ((ret.unwrap_or(0) & 0xFFFE) == 0xFFF8) {
+ buf.push((ref_crc >> 8) as u8);
+ buf.push(ref_crc as u8);
+ break;
+ }
+ }
+ if (self.max_size > 0) && (buf.len() > self.max_size) {
+ return Err(DemuxerError::InvalidData);
+ }
+ if buf.len() > (1 << 23) {
+ return Err(DemuxerError::InvalidData);
+ }
+ }
+
+ let (duration, pts) = if self.blk_samples != 0 {
+ validate!((buf[1] & 1) == 0);
+ let blkno = u64::from(read_utf8(&buf[4..])?);
+ self.cur_samples = blkno * u64::from(self.blk_samples);
+ (u64::from(self.blk_samples), blkno)
+ } else {
+ validate!((buf[1] & 1) != 0);
+ let blksamps = u64::from(read_utf8(&buf[4..])?);
+ (blksamps, self.cur_samples)
+ };
+
+ let stream = strmgr.get_stream(0).unwrap();
+ let (tb_num, tb_den) = stream.get_timebase();
+ let ts = NATimeInfo::new(Some(pts), None, Some(duration), tb_num, tb_den);
+ let pkt = NAPacket::new(stream, ts, true, buf);
+
+ self.cur_samples += duration;
+
+ Ok(pkt)
+ }
+ fn seek(&mut self, time: NATimePoint, seek_index: &SeekIndex) -> DemuxerResult<()> {
+ let ret = seek_index.find_pos(time);
+ if ret.is_none() {
+ return Err(DemuxerError::SeekError);
+ }
+ let seek_info = ret.unwrap();
+ self.cur_samples = seek_info.pts;
+ self.src.seek(SeekFrom::Start(self.data_start + seek_info.pos))?;
+
+ Ok(())
+ }
+}
+
+impl<'a> NAOptionHandler for FLACDemuxer<'a> {
+ fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] }
+ fn set_options(&mut self, _options: &[NAOption]) { }
+ fn query_option_value(&self, _name: &str) -> Option<NAValue> { None }
+}
+
+pub struct FLACDemuxerCreator { }
+
+impl DemuxerCreator for FLACDemuxerCreator {
+ fn new_demuxer<'a>(&self, br: &'a mut ByteReader<'a>) -> Box<dyn DemuxCore<'a> + 'a> {
+ Box::new(FLACDemuxer::new(br))
+ }
+ fn get_name(&self) -> &'static str { "flac" }
+}
+
+#[cfg(test)]
+mod test {
+ use super::*;
+ use std::fs::File;
+
+ #[test]
+ fn test_flac_demux() {
+ let mut file = File::open("assets/LLaudio/luckynight.flac").unwrap();
+ let mut fr = FileReader::new_read(&mut file);
+ let mut br = ByteReader::new(&mut fr);
+ let mut dmx = FLACDemuxer::new(&mut br);
+ let mut sm = StreamManager::new();
+ let mut si = SeekIndex::new();
+ dmx.open(&mut sm, &mut si).unwrap();
+ loop {
+ let pktres = dmx.get_frame(&mut sm);
+ if let Err(e) = pktres {
+ if (e as i32) == (DemuxerError::EOF as i32) { break; }
+ panic!("error");
+ }
+ let pkt = pktres.unwrap();
+ println!("Got {}", pkt);
+ }
+ }
+}
+
+const CRC16_TABLE: [u16; 256] = [
+ 0x0000, 0x8005, 0x800F, 0x000A, 0x801B, 0x001E, 0x0014, 0x8011,
+ 0x8033, 0x0036, 0x003C, 0x8039, 0x0028, 0x802D, 0x8027, 0x0022,
+ 0x8063, 0x0066, 0x006C, 0x8069, 0x0078, 0x807D, 0x8077, 0x0072,
+ 0x0050, 0x8055, 0x805F, 0x005A, 0x804B, 0x004E, 0x0044, 0x8041,
+ 0x80C3, 0x00C6, 0x00CC, 0x80C9, 0x00D8, 0x80DD, 0x80D7, 0x00D2,
+ 0x00F0, 0x80F5, 0x80FF, 0x00FA, 0x80EB, 0x00EE, 0x00E4, 0x80E1,
+ 0x00A0, 0x80A5, 0x80AF, 0x00AA, 0x80BB, 0x00BE, 0x00B4, 0x80B1,
+ 0x8093, 0x0096, 0x009C, 0x8099, 0x0088, 0x808D, 0x8087, 0x0082,
+ 0x8183, 0x0186, 0x018C, 0x8189, 0x0198, 0x819D, 0x8197, 0x0192,
+ 0x01B0, 0x81B5, 0x81BF, 0x01BA, 0x81AB, 0x01AE, 0x01A4, 0x81A1,
+ 0x01E0, 0x81E5, 0x81EF, 0x01EA, 0x81FB, 0x01FE, 0x01F4, 0x81F1,
+ 0x81D3, 0x01D6, 0x01DC, 0x81D9, 0x01C8, 0x81CD, 0x81C7, 0x01C2,
+ 0x0140, 0x8145, 0x814F, 0x014A, 0x815B, 0x015E, 0x0154, 0x8151,
+ 0x8173, 0x0176, 0x017C, 0x8179, 0x0168, 0x816D, 0x8167, 0x0162,
+ 0x8123, 0x0126, 0x012C, 0x8129, 0x0138, 0x813D, 0x8137, 0x0132,
+ 0x0110, 0x8115, 0x811F, 0x011A, 0x810B, 0x010E, 0x0104, 0x8101,
+ 0x8303, 0x0306, 0x030C, 0x8309, 0x0318, 0x831D, 0x8317, 0x0312,
+ 0x0330, 0x8335, 0x833F, 0x033A, 0x832B, 0x032E, 0x0324, 0x8321,
+ 0x0360, 0x8365, 0x836F, 0x036A, 0x837B, 0x037E, 0x0374, 0x8371,
+ 0x8353, 0x0356, 0x035C, 0x8359, 0x0348, 0x834D, 0x8347, 0x0342,
+ 0x03C0, 0x83C5, 0x83CF, 0x03CA, 0x83DB, 0x03DE, 0x03D4, 0x83D1,
+ 0x83F3, 0x03F6, 0x03FC, 0x83F9, 0x03E8, 0x83ED, 0x83E7, 0x03E2,
+ 0x83A3, 0x03A6, 0x03AC, 0x83A9, 0x03B8, 0x83BD, 0x83B7, 0x03B2,
+ 0x0390, 0x8395, 0x839F, 0x039A, 0x838B, 0x038E, 0x0384, 0x8381,
+ 0x0280, 0x8285, 0x828F, 0x028A, 0x829B, 0x029E, 0x0294, 0x8291,
+ 0x82B3, 0x02B6, 0x02BC, 0x82B9, 0x02A8, 0x82AD, 0x82A7, 0x02A2,
+ 0x82E3, 0x02E6, 0x02EC, 0x82E9, 0x02F8, 0x82FD, 0x82F7, 0x02F2,
+ 0x02D0, 0x82D5, 0x82DF, 0x02DA, 0x82CB, 0x02CE, 0x02C4, 0x82C1,
+ 0x8243, 0x0246, 0x024C, 0x8249, 0x0258, 0x825D, 0x8257, 0x0252,
+ 0x0270, 0x8275, 0x827F, 0x027A, 0x826B, 0x026E, 0x0264, 0x8261,
+ 0x0220, 0x8225, 0x822F, 0x022A, 0x823B, 0x023E, 0x0234, 0x8231,
+ 0x8213, 0x0216, 0x021C, 0x8219, 0x0208, 0x820D, 0x8207, 0x0202
+];
projects / nihav.git / blobdiff