From 4e7deeda5279e94cb7e676ad1555e5cfa7c3ad3a Mon Sep 17 00:00:00 2001 From: Kostya Shishkov Date: Sat, 12 Dec 2020 13:51:57 +0100 Subject: [PATCH] mov: calculate DTS --- nihav-commonfmt/src/demuxers/mov.rs | 106 +++++++++++++++++++++++++++- 1 file changed, 104 insertions(+), 2 deletions(-) diff --git a/nihav-commonfmt/src/demuxers/mov.rs b/nihav-commonfmt/src/demuxers/mov.rs index 0f1020a..847d494 100644 --- a/nihav-commonfmt/src/demuxers/mov.rs +++ b/nihav-commonfmt/src/demuxers/mov.rs @@ -450,6 +450,7 @@ const STBL_CHUNK_HANDLERS: &[TrackChunkHandler] = &[ TrackChunkHandler { ctype: mktag!(b"stsz"), parse: read_stsz }, TrackChunkHandler { ctype: mktag!(b"stco"), parse: read_stco }, TrackChunkHandler { ctype: mktag!(b"stsh"), parse: skip_chunk }, + TrackChunkHandler { ctype: mktag!(b"ctts"), parse: read_ctts }, ]; fn parse_audio_edata(br: &mut ByteReader, start_pos: u64, size: u64) -> DemuxerResult>> { @@ -677,6 +678,8 @@ fn read_stts(track: &mut Track, br: &mut ByteReader, size: u64) -> DemuxerResult } else if entries == 1 { let _count = br.read_u32be()?; let tb_num = br.read_u32be()?; + validate!(tb_num != 0); + track.tb_div = tb_num; if let Some(ref mut stream) = track.stream { let tb_den = stream.tb_den; let (tb_num, tb_den) = reduce_timebase(tb_num * stream.tb_num, tb_den); @@ -775,6 +778,32 @@ fn read_stco(track: &mut Track, br: &mut ByteReader, size: u64) -> DemuxerResult Ok(size) } +fn read_ctts(track: &mut Track, br: &mut ByteReader, size: u64) -> DemuxerResult { + validate!(size >= 8); + let version = br.read_byte()?; + let _flags = br.read_u24be()?; + if version > 1 { + return Err(DemuxerError::NotImplemented); + } + let entries = br.read_u32be()? as usize; + track.ctts_version = version; + track.ctts_map.resize(entries); + match version { + 0 | 1 => { + validate!(size == (entries as u64) * 8 + 8); + for _ in 0..entries { + let samp_count = br.read_u32be()?; + let samp_offset = br.read_u32be()?; + track.ctts_map.add(samp_count, samp_offset / track.tb_div); + } + }, + _ => unreachable!(), + }; + track.ctts_map.reset(); + + Ok(size) +} + struct MOVDemuxer<'a> { src: &'a mut ByteReader<'a>, depth: usize, @@ -795,6 +824,7 @@ struct Track { track_no: u32, tb_num: u32, tb_den: u32, + tb_div: u32, raw_audio: bool, raw_apos: u64, duration: u32, @@ -815,6 +845,8 @@ struct Track { sample_map: Vec<(u32, u32)>, sample_size: u32, frame_samples: usize, + ctts_map: RLESearcher, + ctts_version: u8, stream: Option, cur_chunk: usize, cur_sample: usize, @@ -867,6 +899,60 @@ impl TimeSearcher { } } +#[derive(Default)] +struct RLESearcher { + array: Vec<(u32, T)>, + idx: usize, + start: u64, + next: u64, +} + +impl RLESearcher { + fn new() -> Self { Self::default() } + fn resize(&mut self, size: usize) { + self.array.truncate(0); + self.array.reserve(size); + } + fn add(&mut self, len: u32, val: T) { + self.array.push((len, val)); + } + fn reset(&mut self) { + self.start = 0; + if !self.array.is_empty() { + self.idx = 0; + self.next = u64::from(self.array[0].0); + } else { + self.idx = self.array.len(); + self.next = 0; + } + } + fn map(&mut self, sample: u64) -> Option { + if sample < self.start { + self.reset(); + } + if self.idx < self.array.len() { + if sample < self.next { + Some(self.array[self.idx].1) + } else { + while (self.idx < self.array.len()) && (sample >= self.next) { + self.start = self.next; + self.idx += 1; + if self.idx < self.array.len() { + self.next += u64::from(self.array[self.idx].0); + } + } + if self.idx < self.array.len() { + Some(self.array[self.idx].1) + } else { + None + } + } + } else { + None + } + } +} + impl Track { fn new(track_no: u32, tb_den: u32) -> Self { Self { @@ -877,6 +963,7 @@ impl Track { track_no, tb_num: 1, tb_den, + tb_div: 1, raw_audio: false, raw_apos: 0, duration: 0, @@ -894,6 +981,8 @@ impl Track { sample_map: Vec::new(), sample_size: 0, frame_samples: 0, + ctts_map: RLESearcher::new(), + ctts_version: 0, stream: None, depth: 0, cur_chunk: 0, @@ -955,8 +1044,21 @@ impl Track { } fn get_next_chunk(&mut self) -> Option<(NATimeInfo, u64, usize)> { let pts_val = self.timesearch.map_time(self.cur_sample as u32, &self.time_to_sample); - let mut pts = NATimeInfo::new(Some(pts_val), None, None, self.tb_num, self.tb_den); -//todo dts decoding + let dts = if let Some(dts_corr) = self.ctts_map.map(self.cur_sample as u64) { + let dts = match self.ctts_version { + 0 => pts_val.wrapping_add(u64::from(dts_corr)), + 1 => pts_val.wrapping_add(i64::from(dts_corr as i32) as u64), + _ => unimplemented!(), + }; + if (dts as i64) < 0 { + None + } else { + Some(dts) + } + } else { + None + }; + let mut pts = NATimeInfo::new(Some(pts_val), dts, None, self.tb_num, self.tb_den); if self.chunk_offsets.len() == self.chunk_sizes.len() { // simple one-to-one mapping if self.cur_sample >= self.chunk_sizes.len() { return None; -- 2.39.5