X-Git-Url: https://git.nihav.org/?a=blobdiff_plain;f=nihav-llaudio%2Fsrc%2Fdemuxers%2Fflac.rs;fp=nihav-llaudio%2Fsrc%2Fdemuxers%2Fflac.rs;h=f19ce5639e6a9a6a6fd3029e2b9d05cc0489df56;hb=87927c5732b39bb23209486bed8d7bb7fc56b92e;hp=0000000000000000000000000000000000000000;hpb=640b1eb06b5c5e0678bc35d2e2e297e4b3bda540;p=nihav.git diff --git a/nihav-llaudio/src/demuxers/flac.rs b/nihav-llaudio/src/demuxers/flac.rs new file mode 100644 index 0000000..f19ce56 --- /dev/null +++ b/nihav-llaudio/src/demuxers/flac.rs @@ -0,0 +1,242 @@ +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 { + 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 = 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 { + 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 { None } +} + +pub struct FLACDemuxerCreator { } + +impl DemuxerCreator for FLACDemuxerCreator { + fn new_demuxer<'a>(&self, br: &'a mut ByteReader<'a>) -> Box + '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 +];