From 5be37b035b838a5ae5f7ea4845c1b727802d19cf Mon Sep 17 00:00:00 2001 From: Kostya Shishkov Date: Fri, 17 Apr 2020 14:00:54 +0200 Subject: [PATCH] vmd: support stereo IMA ADPCM --- nihav-game/src/codecs/vmd.rs | 38 +++++++++++++++++++++++++++++++++--- 1 file changed, 35 insertions(+), 3 deletions(-) diff --git a/nihav-game/src/codecs/vmd.rs b/nihav-game/src/codecs/vmd.rs index ce40b95..65d5de3 100644 --- a/nihav-game/src/codecs/vmd.rs +++ b/nihav-game/src/codecs/vmd.rs @@ -462,13 +462,14 @@ impl NADecoder for VMDAudioDecoder { self.is_odd = (channels == 2) && ((self.blk_size & 1) != 0); } } else { - fmt = SND_S16P_FORMAT; self.blk_align = ainfo.get_block_len(); if (flags & 0x10) == 0 { + fmt = SND_S16P_FORMAT; self.blk_size = (ainfo.get_block_len() + 1) * channels; self.mode = VMDAudioMode::DPCM; } else { - self.blk_size = (ainfo.get_block_len() + 1) / 2 + 3; + fmt = SND_S16_FORMAT; + self.blk_size = (ainfo.get_block_len() * channels + 1) / 2 + 3 * channels; self.mode = VMDAudioMode::ADPCM; } }; @@ -597,6 +598,9 @@ impl NADecoder for VMDAudioDecoder { let mut ima = IMAState::new(); for _ in 0..nblocks { if (mask & 1) != 0 { + for i in 0..self.blk_align { + dst[doff + i] = 0; + } doff += self.blk_align; mask >>= 1; continue; @@ -618,7 +622,35 @@ impl NADecoder for VMDAudioDecoder { mask >>= 1; } } else { - return Err(DecoderError::InvalidData); + let mut mask = mask; + let mut ima1 = IMAState::new(); + let mut ima2 = IMAState::new(); + for _ in 0..nblocks { + if (mask & 1) != 0 { + for i in 0..self.blk_align * 2 { + dst[doff + i] = 0; + } + doff += self.blk_align * 2; + mask >>= 1; + continue; + } + let pred1 = br.read_u16le()? as i16; + let pred2 = br.read_u16le()? as i16; + let step1 = br.read_byte()?; + let step2 = br.read_byte()?; + validate!((step1 as usize) < IMA_STEP_TABLE.len()); + validate!((step2 as usize) < IMA_STEP_TABLE.len()); + ima1.reset(pred1, step1); + ima2.reset(pred2, step2); + for _ in 0..self.blk_align { + let b = br.read_byte()?; + dst[doff] = ima1.expand_sample(b >> 4); + doff += 1; + dst[doff] = ima2.expand_sample(b & 0xF); + doff += 1; + } + mask >>= 1; + } } }, }; -- 2.39.5