| 1 | use nihav_core::frame::*; |
| 2 | use nihav_core::demuxers::*; |
| 3 | |
| 4 | struct FLACDemuxer<'a> { |
| 5 | src: &'a mut ByteReader<'a>, |
| 6 | data_start: u64, |
| 7 | tot_samples: u64, |
| 8 | cur_samples: u64, |
| 9 | blk_samples: u16, |
| 10 | min_samples: u16, |
| 11 | min_size: usize, |
| 12 | max_size: usize, |
| 13 | srate: u32, |
| 14 | build_index: bool, |
| 15 | } |
| 16 | |
| 17 | impl<'a> FLACDemuxer<'a> { |
| 18 | fn new(io: &'a mut ByteReader<'a>) -> Self { |
| 19 | Self { |
| 20 | src: io, |
| 21 | data_start: 0, |
| 22 | tot_samples: 0, |
| 23 | cur_samples: 0, |
| 24 | blk_samples: 0, |
| 25 | min_samples: 0, |
| 26 | min_size: 0, |
| 27 | max_size: 0, |
| 28 | srate: 0, |
| 29 | build_index: false, |
| 30 | } |
| 31 | } |
| 32 | } |
| 33 | |
| 34 | impl<'a> RawDemuxCore<'a> for FLACDemuxer<'a> { |
| 35 | fn open(&mut self, strmgr: &mut StreamManager, seek_index: &mut SeekIndex) -> DemuxerResult<()> { |
| 36 | let tag = self.src.read_tag()?; |
| 37 | validate!(&tag == b"fLaC"); |
| 38 | let mut streaminfo: Vec<u8> = Vec::new(); |
| 39 | let mut srate = 0u32; |
| 40 | let mut channels = 0u8; |
| 41 | loop { |
| 42 | let id1 = self.src.read_byte()?; |
| 43 | let len = self.src.read_u24be()? as usize; |
| 44 | let id = id1 & 0x7F; |
| 45 | |
| 46 | match id { |
| 47 | 0x00 => { |
| 48 | validate!(len >= 34); |
| 49 | streaminfo = vec![0u8; len]; |
| 50 | self.src.read_buf(&mut streaminfo)?; |
| 51 | let min_bs = read_u16be(&streaminfo[0..])?; |
| 52 | let max_bs = read_u16be(&streaminfo[2..])?; |
| 53 | if min_bs == max_bs { |
| 54 | self.blk_samples = max_bs; |
| 55 | } |
| 56 | self.min_samples = min_bs; |
| 57 | self.min_size = read_u24be(&streaminfo[4..])? as usize; |
| 58 | self.max_size = read_u24be(&streaminfo[7..])? as usize; |
| 59 | let word = read_u24be(&streaminfo[10..])?; |
| 60 | srate = word >> 4; |
| 61 | channels = (((word >> 1) & 7) + 1) as u8; |
| 62 | self.tot_samples = (u64::from(streaminfo[13] & 0xF) << 32) | u64::from(read_u32be(&streaminfo[14..])?); |
| 63 | }, |
| 64 | 0x03 => { |
| 65 | validate!((len % 18) == 0); |
| 66 | seek_index.mode = SeekIndexMode::Present; |
| 67 | for _ in 0..len / 18 { |
| 68 | let sample = self.src.read_u64be()?; |
| 69 | let offset = self.src.read_u64be()?; |
| 70 | let _nsamps = self.src.read_u16be()?; |
| 71 | let time = sample * 1000 / u64::from(srate.max(1000)); |
| 72 | seek_index.add_entry(0, SeekEntry { time, pts: sample, pos: offset }); |
| 73 | } |
| 74 | }, |
| 75 | _ => self.src.read_skip(len)?, |
| 76 | }; |
| 77 | |
| 78 | if (id1 & 0x80) != 0 { |
| 79 | break; |
| 80 | } |
| 81 | } |
| 82 | if seek_index.mode != SeekIndexMode::Present { |
| 83 | seek_index.mode = SeekIndexMode::Automatic; |
| 84 | self.build_index = true; |
| 85 | } else { |
| 86 | self.build_index = false; |
| 87 | } |
| 88 | self.data_start = self.src.tell(); |
| 89 | validate!(srate != 0); |
| 90 | self.srate = srate; |
| 91 | |
| 92 | let base = if self.blk_samples != 0 { u32::from(self.blk_samples) } else { 1 }; |
| 93 | let ahdr = NAAudioInfo::new(srate, channels as u8, SND_S16P_FORMAT, base as usize); |
| 94 | let ainfo = NACodecInfo::new("flac", NACodecTypeInfo::Audio(ahdr), Some(streaminfo)); |
| 95 | strmgr.add_stream(NAStream::new(StreamType::Audio, 0, ainfo, base, srate, 0)).unwrap(); |
| 96 | |
| 97 | Ok(()) |
| 98 | } |
| 99 | fn get_data(&mut self, strmgr: &mut StreamManager) -> DemuxerResult<NARawData> { |
| 100 | let stream = strmgr.get_stream(0).unwrap(); |
| 101 | let mut buf = vec![0; 8192]; |
| 102 | let size = self.src.read_buf_some(&mut buf)?; |
| 103 | buf.truncate(size); |
| 104 | Ok(NARawData::new(stream, buf)) |
| 105 | } |
| 106 | fn seek(&mut self, time: NATimePoint, seek_index: &SeekIndex) -> DemuxerResult<()> { |
| 107 | if seek_index.mode == SeekIndexMode::Present { |
| 108 | let ret = seek_index.find_pos(time); |
| 109 | if ret.is_none() { |
| 110 | return Err(DemuxerError::SeekError); |
| 111 | } |
| 112 | let seek_info = ret.unwrap(); |
| 113 | self.cur_samples = seek_info.pts; |
| 114 | self.src.seek(SeekFrom::Start(self.data_start + seek_info.pos))?; |
| 115 | Ok(()) |
| 116 | } else { |
| 117 | Err(DemuxerError::NotPossible) |
| 118 | } |
| 119 | } |
| 120 | fn get_duration(&self) -> u64 { self.tot_samples * 1000 / u64::from(self.srate) } |
| 121 | } |
| 122 | |
| 123 | impl<'a> NAOptionHandler for FLACDemuxer<'a> { |
| 124 | fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] } |
| 125 | fn set_options(&mut self, _options: &[NAOption]) { } |
| 126 | fn query_option_value(&self, _name: &str) -> Option<NAValue> { None } |
| 127 | } |
| 128 | |
| 129 | pub struct FLACDemuxerCreator { } |
| 130 | |
| 131 | impl RawDemuxerCreator for FLACDemuxerCreator { |
| 132 | fn new_demuxer<'a>(&self, br: &'a mut ByteReader<'a>) -> Box<dyn RawDemuxCore<'a> + 'a> { |
| 133 | Box::new(FLACDemuxer::new(br)) |
| 134 | } |
| 135 | fn get_name(&self) -> &'static str { "flac" } |
| 136 | fn check_format(&self, br: &mut ByteReader) -> bool { |
| 137 | if br.seek(SeekFrom::Start(0)).is_err() { |
| 138 | return false; |
| 139 | } |
| 140 | if let Ok([b'f', b'L', b'a', b'C']) = br.read_tag() { |
| 141 | true |
| 142 | } else { |
| 143 | false |
| 144 | } |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | #[cfg(test)] |
| 149 | mod test { |
| 150 | use nihav_core::codecs::*; |
| 151 | use super::*; |
| 152 | use crate::llaudio_register_all_packetisers; |
| 153 | use std::fs::File; |
| 154 | |
| 155 | #[test] |
| 156 | fn test_flac_raw_demux() { |
| 157 | // sample: https://samples.mplayerhq.hu/A-codecs/lossless/luckynight.flac |
| 158 | let mut file = File::open("assets/LLaudio/luckynight.flac").unwrap(); |
| 159 | let mut fr = FileReader::new_read(&mut file); |
| 160 | let mut br = ByteReader::new(&mut fr); |
| 161 | let mut dmx = FLACDemuxer::new(&mut br); |
| 162 | let mut sm = StreamManager::new(); |
| 163 | let mut si = SeekIndex::new(); |
| 164 | dmx.open(&mut sm, &mut si).unwrap(); |
| 165 | let stream = sm.get_stream(0).unwrap(); |
| 166 | let mut pkt_reg = RegisteredPacketisers::new(); |
| 167 | llaudio_register_all_packetisers(&mut pkt_reg); |
| 168 | let creator = pkt_reg.find_packetiser("flac").unwrap(); |
| 169 | let mut pkts = (creator)(); |
| 170 | let mut tot_size = 0; |
| 171 | while let Ok(pkt) = dmx.get_data(&mut sm) { |
| 172 | tot_size += pkt.get_buffer().len(); |
| 173 | pkts.add_data(&pkt.get_buffer()); |
| 174 | } |
| 175 | let mut tot_size2 = 0; |
| 176 | let mut npkts = 0; |
| 177 | while let Ok(Some(pkt)) = pkts.get_packet(stream.clone()) { |
| 178 | tot_size2 += pkt.get_buffer().len(); |
| 179 | npkts += 1; |
| 180 | } |
| 181 | assert_eq!(npkts, 579); |
| 182 | assert_eq!(tot_size, tot_size2); |
| 183 | } |
| 184 | } |