From: Kostya Shishkov Date: Mon, 2 Mar 2026 16:59:18 +0000 (+0100) Subject: nihav_codec_support: introduce module for common JPEG decoding functionality X-Git-Url: https://git.nihav.org/?a=commitdiff_plain;h=76faa78045e5eb8eb49f361f4e7739febdb45397;p=nihav.git nihav_codec_support: introduce module for common JPEG decoding functionality --- diff --git a/nihav-codec-support/Cargo.toml b/nihav-codec-support/Cargo.toml index 82162b2..5fb3b91 100644 --- a/nihav-codec-support/Cargo.toml +++ b/nihav-codec-support/Cargo.toml @@ -11,6 +11,7 @@ path = "../nihav-core" default = [] blockdsp = [] +jpeg = [] h263 = ["blockdsp"] dsp = [] diff --git a/nihav-codec-support/src/codecs/jpeg.rs b/nihav-codec-support/src/codecs/jpeg.rs new file mode 100644 index 0000000..e92e594 --- /dev/null +++ b/nihav-codec-support/src/codecs/jpeg.rs @@ -0,0 +1,536 @@ +//! Common routines and tables for JPEG decoding. +use nihav_core::io::bitreader::*; +use nihav_core::io::codebook::*; +use nihav_core::codecs::*; +use crate::codecs::ZIGZAG; + +const W1: i32 = 2841; +const W2: i32 = 2676; +const W3: i32 = 2408; +const W5: i32 = 1609; +const W6: i32 = 1108; +const W7: i32 = 565; +const W8: i32 = 181; + +const ROW_SHIFT: u8 = 8; +const COL_SHIFT: u8 = 14; + +fn idct_row(row: &mut [i16]) { + let in0 = ((i32::from(row[0])) << 11) + (1 << (ROW_SHIFT - 1)); + let in1 = (i32::from(row[4])) << 11; + let in2 = i32::from(row[6]); + let in3 = i32::from(row[2]); + let in4 = i32::from(row[1]); + let in5 = i32::from(row[7]); + let in6 = i32::from(row[5]); + let in7 = i32::from(row[3]); + + let tmp = W7 * (in4 + in5); + let a4 = tmp + (W1 - W7) * in4; + let a5 = tmp - (W1 + W7) * in5; + + let tmp = W3 * (in6 + in7); + let a6 = tmp - (W3 - W5) * in6; + let a7 = tmp - (W3 + W5) * in7; + + let tmp = in0 + in1; + + let a0 = in0 - in1; + let t1 = W6 * (in2 + in3); + let a2 = t1 - (W2 + W6) * in2; + let a3 = t1 + (W2 - W6) * in3; + let b1 = a4 + a6; + + let b4 = a4 - a6; + let t2 = a5 - a7; + let b6 = a5 + a7; + let b7 = tmp + a3; + let b5 = tmp - a3; + let b3 = a0 + a2; + let b0 = a0 - a2; + let b2 = (W8 * (b4 + t2) + 128) >> 8; + let b4 = (W8 * (b4 - t2) + 128) >> 8; + + row[0] = ((b7 + b1) >> ROW_SHIFT) as i16; + row[7] = ((b7 - b1) >> ROW_SHIFT) as i16; + row[1] = ((b3 + b2) >> ROW_SHIFT) as i16; + row[6] = ((b3 - b2) >> ROW_SHIFT) as i16; + row[2] = ((b0 + b4) >> ROW_SHIFT) as i16; + row[5] = ((b0 - b4) >> ROW_SHIFT) as i16; + row[3] = ((b5 + b6) >> ROW_SHIFT) as i16; + row[4] = ((b5 - b6) >> ROW_SHIFT) as i16; +} + +#[allow(clippy::erasing_op)] +#[allow(clippy::identity_op)] +fn idct_col(blk: &mut [i16; 64], off: usize) { + let in0 = ((i32::from(blk[off + 0*8])) << 8) + (1 << (COL_SHIFT - 1)); + let in1 = (i32::from(blk[off + 4*8])) << 8; + let in2 = i32::from(blk[off + 6*8]); + let in3 = i32::from(blk[off + 2*8]); + let in4 = i32::from(blk[off + 1*8]); + let in5 = i32::from(blk[off + 7*8]); + let in6 = i32::from(blk[off + 5*8]); + let in7 = i32::from(blk[off + 3*8]); + + let tmp = W7 * (in4 + in5); + let a4 = (tmp + (W1 - W7) * in4) >> 3; + let a5 = (tmp - (W1 + W7) * in5) >> 3; + + let tmp = W3 * (in6 + in7); + let a6 = (tmp - (W3 - W5) * in6) >> 3; + let a7 = (tmp - (W3 + W5) * in7) >> 3; + + let tmp = in0 + in1; + + let a0 = in0 - in1; + let t1 = W6 * (in2 + in3); + let a2 = (t1 - (W2 + W6) * in2) >> 3; + let a3 = (t1 + (W2 - W6) * in3) >> 3; + let b1 = a4 + a6; + + let b4 = a4 - a6; + let t2 = a5 - a7; + let b6 = a5 + a7; + let b7 = tmp + a3; + let b5 = tmp - a3; + let b3 = a0 + a2; + let b0 = a0 - a2; + let b2 = (W8 * (b4 + t2) + 128) >> 8; + let b4 = (W8 * (b4 - t2) + 128) >> 8; + + blk[off + 0*8] = ((b7 + b1) >> COL_SHIFT) as i16; + blk[off + 7*8] = ((b7 - b1) >> COL_SHIFT) as i16; + blk[off + 1*8] = ((b3 + b2) >> COL_SHIFT) as i16; + blk[off + 6*8] = ((b3 - b2) >> COL_SHIFT) as i16; + blk[off + 2*8] = ((b0 + b4) >> COL_SHIFT) as i16; + blk[off + 5*8] = ((b0 - b4) >> COL_SHIFT) as i16; + blk[off + 3*8] = ((b5 + b6) >> COL_SHIFT) as i16; + blk[off + 4*8] = ((b5 - b6) >> COL_SHIFT) as i16; +} + +/// Performs inverse DCT on the 8x8 coefficients block. +pub fn idct(blk: &mut [i16; 64]) { + for i in 0..8 { idct_row(&mut blk[i*8..(i+1)*8]); } + for i in 0..8 { idct_col(blk, i); } +} + +/// Puts a single 8x8 block to the destination image. +pub fn put_block(blk: &[i16; 64], dst: &mut [u8], stride: usize) { + for (drow, srow) in dst.chunks_mut(stride).zip(blk.chunks(8)) { + for (del, &pix) in drow.iter_mut().zip(srow.iter()) { + *del = pix.clamp(0, 255) as u8; + } + } +} + +/// Single component definition. +#[derive(Clone,Copy,Default)] +pub struct ComponentInfo { + /// Component ID (0 = luma, 1/2 = chroma). + pub component_id: usize, + /// DC codebook ID. + pub dc_table_id: usize, + /// AC codebook ID. + pub ac_table_id: usize, +} + +/// Known JPEG types. +#[derive(Clone,Copy,Debug,PartialEq)] +pub enum JPEGType { + None, + Baseline, + Extended, + Progressive, + Lossless, + Differential, + DiffProgressive, + DiffLossless, + JPEGLS, +} + +struct HuffDescReader<'a> { + codes: &'a [u16], + bits: &'a [u8], + syms: &'a [u8], +} + +impl<'a> CodebookDescReader for HuffDescReader<'a> { + fn bits(&mut self, idx: usize) -> u8 { self.bits[idx] } + fn code(&mut self, idx: usize) -> u32 { u32::from(self.codes[idx]) } + fn sym (&mut self, idx: usize) -> u8 { self.syms[idx] } + fn len(&mut self) -> usize { self.syms.len() } +} + +/// JPEG codebooks for reading block coefficients. +#[derive(Default)] +pub struct JCodebooks { + pub codebook: [[Option>; 4]; 2], +} + +impl JCodebooks { + /// Creates a codebook using JPEG-style description consisting of code lengths and symbol values. + pub fn generate_cb(lens: &[u8; 16], syms: &[u8]) -> DecoderResult> { + let mut codes = [0; 256]; + let mut bits = [0; 256]; + + let mut iter = bits.iter_mut(); + for (i, &len) in lens.iter().enumerate() { + for _ in 0..len { + *iter.next().unwrap() = (i + 1) as u8; + } + } + let mut code = 0; + let mut si = bits[0]; + let mut idx = 0; + while idx < syms.len() { + while idx < syms.len() && bits[idx] == si { + codes[idx] = code; + code += 1; + idx += 1; + } + while idx < syms.len() && bits[idx] != si { + code <<= 1; + si += 1; + } + } + + let mut cbr = HuffDescReader { codes: &codes, bits: &bits, syms }; + Ok(Codebook::new(&mut cbr, CodebookMode::MSB)?) + } + /// Creates a codebook for specific coefficient type and number. + pub fn build_default_cb(dc: bool, idx: usize) -> DecoderResult> { + if idx > 1 { + return Err(DecoderError::InvalidData); + } + if dc { + Self::generate_cb(&DC_LENS[idx], &DC_SYMS) + } else { + Self::generate_cb(&AC_LENS[idx], AC_SYMS[idx]) + } + } + /// Creates a `JCodebooks` instance with the default JPEG codebook. + pub fn default_jpeg_codebooks() -> Self { + let dc0_cb = Self::build_default_cb(true, 0).unwrap(); + let dc1_cb = Self::build_default_cb(true, 1).unwrap(); + let ac0_cb = Self::build_default_cb(false, 0).unwrap(); + let ac1_cb = Self::build_default_cb(false, 1).unwrap(); + Self { + codebook: [ + [Some(dc0_cb), Some(dc1_cb), None, None], + [Some(ac0_cb), Some(ac1_cb), None, None] + ] + } + } +} + +fn read_dc(br: &mut BitReader, cb: &Codebook) -> DecoderResult { + let cat = br.read_cb(cb)?; + match cat { + 0 => Ok(0), + 1..=11 => { + let add_bits = br.read(cat)? as i16; + let pivot = 1 << (cat - 1); + if add_bits < pivot { + Ok(add_bits + 1 - pivot * 2) + } else { + Ok(add_bits) + } + }, + _ => Err(DecoderError::InvalidData) + } +} + +fn read_ac(br: &mut BitReader, cb: &Codebook) -> DecoderResult<(usize, i16)> { + let val = br.read_cb(cb)?; + let run = usize::from(val >> 4); + let cat = val & 0xF; + let level = if cat != 0 { + if cat >= 11 { + return Err(DecoderError::InvalidData); + } + let add_bits = br.read(cat)? as i16; + let pivot = 1 << (cat - 1); + if add_bits < pivot { + add_bits + 1 - pivot * 2 + } else { + add_bits + } + } else if run == 0 || run == 15 { + 0 + } else { + return Err(DecoderError::InvalidData); + }; + Ok((run, level)) +} + +/// Decodes a single 8x8 coefficient block. +pub fn read_block(br: &mut BitReader, blk: &mut [i16; 64], dc_cb: &Codebook, ac_cb: &Codebook, ss: usize, se: usize, qmat: &[i16; 64]) -> DecoderResult<()> { + if ss == 0 { + blk[0] = read_dc(br, dc_cb)?; + blk[0] *= qmat[0]; + } + let mut idx = 1; + while idx <= se { + let (run, level) = read_ac(br, ac_cb)?; + if run == 0 && level == 0 { + break; + } + idx += run; + if idx >= 64 { + return Err(DecoderError::InvalidData); + } + blk[ZIGZAG[idx]] = level * qmat[idx]; + idx += 1; + } + Ok(()) +} + +/// Base JPEG decoder. +pub struct JPEGDecoder { + /// Quantisation matrices. + pub quant: [[i16; 64]; 4], + /// Quantisation matrix selectors for each component. + pub qselect: [u8; MAX_CHROMATONS], + /// Component IDs. + pub comp_id: [u8; MAX_CHROMATONS], + /// Component subsampling modes. + pub subsamp: [u8; MAX_CHROMATONS], + /// Coefficient codebooks + pub cb: JCodebooks, + /// Image width. + pub width: usize, + /// Image height. + pub height: usize, + /// Pixel depth. + pub depth: u8, + /// Maximum horisontal subsampling. + pub max_h: u8, + /// Maximum vertical subsampling. + pub max_v: u8, + /// Codec-specific function for DC predicting in the decoded blocks prior to IDCT. + pub blk_pred: fn (usize, &mut [i16; 64], &mut [i16; MAX_CHROMATONS]), +} + +/// Default block DC prediction function. +pub fn default_blk_pred(comp_no: usize, blk: &mut [i16; 64], last_dc: &mut [i16; MAX_CHROMATONS]) { + blk[0] += last_dc[comp_no]; + last_dc[comp_no] = blk[0]; +} + +impl Default for JPEGDecoder { + fn default() -> Self { + Self { + quant: [[0; 64]; 4], + qselect: [0; MAX_CHROMATONS], + subsamp: [0; MAX_CHROMATONS], + comp_id: [0; MAX_CHROMATONS], + cb: JCodebooks::default(), + width: 0, + height: 0, + depth: 0, + max_h: 0, + max_v: 0, + blk_pred: default_blk_pred, + } + } +} + +impl JPEGDecoder { + /// Creates a new instance of JPEG decoder. + pub fn new() -> Self { Self::default() } + /// Decodes a whole JPEG picture assuming interleaved components. + pub fn decode_image(&mut self, jtype: JPEGType, src: &[u8], src2: Option<&[u8]>, buf: NAVideoBufferRef, ci: &[ComponentInfo]) -> DecoderResult<()> { + if let Some(field2) = src2 { + self.decode_scan(jtype, src, buf.clone(), ci, 0, 63, Some(false))?; + self.decode_scan(jtype, field2, buf, ci, 0, 63, Some(true))?; + Ok(()) + } else { + self.decode_scan(jtype, src, buf, ci, 0, 63, None)?; + Ok(()) + } + } + /// Decodes a single scan of JPEG data. + #[allow(clippy::too_many_arguments)] + pub fn decode_scan(&mut self, jtype: JPEGType, src: &[u8], mut buf: NAVideoBufferRef, ci: &[ComponentInfo], ss: usize, se: usize, imode: Option) -> DecoderResult { + if jtype != JPEGType::Baseline { + return Err(DecoderError::NotImplemented); + } + let num_components = ci.len(); + let mut last_dc = [1024; MAX_CHROMATONS]; + let mut dc_cbs = Vec::with_capacity(num_components); + let mut ac_cbs = Vec::with_capacity(num_components); + let mut qmats = [&self.quant[0]; MAX_CHROMATONS]; + for (i, cinfo) in ci.iter().enumerate() { + dc_cbs.push(if let Some(ref cb) = self.cb.codebook[0][cinfo.dc_table_id] { + cb + } else { unreachable!(); }); + ac_cbs.push(if let Some(ref cb) = self.cb.codebook[1][cinfo.ac_table_id] { + cb + } else { unreachable!(); }); + qmats[i] = &self.quant[self.qselect[cinfo.component_id] as usize]; + } + + let frm = NASimpleVideoFrame::from_video_buf(&mut buf).unwrap(); + + let mut br = BitReader::new(src, BitReaderMode::BE); + + let mut offs = [0; MAX_CHROMATONS]; + let mut stride = [0; MAX_CHROMATONS]; + for ((doff, stride), ci) in offs.iter_mut().zip(stride.iter_mut()).zip(ci.iter()) { + *doff = frm.offset[ci.component_id]; + *stride = frm.stride[ci.component_id]; + } + let mut nblks = [0; MAX_CHROMATONS]; + let mut ystep = [0; MAX_CHROMATONS]; + let mut hstep = 8; + let mut vstep = 8; + if num_components > 1 { + for (i, cinfo) in ci.iter().enumerate() { + let hs = (self.subsamp[cinfo.component_id] >> 4) as usize; + let vs = (self.subsamp[cinfo.component_id] & 0xF) as usize; + hstep = hstep.max(hs * 8); + vstep = vstep.max(vs * 8); + nblks[i] = hs * vs; + ystep[i] = vs * 8; + } + } else { + let subsamp = self.subsamp[ci[0].component_id]; + nblks[0] = 1; + hstep = usize::from(8 * self.max_h / (subsamp >> 4)); + vstep = usize::from(8 * self.max_h / (subsamp & 0xF)); + ystep[0] = 8; + } + + let mut blocks; + let height = if imode.is_none() { self.height } else { self.height / 2 }; + let mut stride = frm.stride; + if imode.is_some() { + for (strd, off) in stride.iter_mut().zip(offs.iter_mut()) { + if imode == Some(true) { + *off += *strd; + } + *strd <<= 1; + } + } + for _y in (0..height).step_by(vstep) { + for x in 0..(self.width + hstep - 1) / hstep { + for i in 0..num_components { + blocks = [[0; 64]; 4]; + for blk in blocks[..nblks[i]].iter_mut() { + read_block(&mut br, blk, dc_cbs[i], ac_cbs[i], ss, se, qmats[i])?; + (self.blk_pred)(i, blk, &mut last_dc); + idct(blk); + } + match self.subsamp[i] { + 0x11 | 0x44 => { + put_block(&blocks[0], &mut frm.data[offs[i] + x * 8..], stride[i]); + }, + 0x21 => { + put_block(&blocks[0], &mut frm.data[offs[i] + x * 16..], stride[i]); + put_block(&blocks[1], &mut frm.data[offs[i] + x * 16 + 8..], stride[i]); + }, + 0x12 => { + put_block(&blocks[0], &mut frm.data[offs[i] + x * 8..], stride[i]); + put_block(&blocks[1], &mut frm.data[offs[i] + x * 8 + stride[i] * 8..], stride[i]); + }, + 0x22 => { + #[allow(clippy::needless_range_loop)] + for j in 0..4 { + put_block(&blocks[j], &mut frm.data[offs[i] + x * 16 + (j & 1) * 8 + (j >> 1) * 8 * stride[i]..], stride[i]); + } + }, + _ => unreachable!(), + }; + } + } + for i in 0..num_components { + offs[i] += stride[i] * ystep[i]; + } + } + + Ok((br.tell() + 7) / 8) + } +} + +/// Default JPEG luma quantisation matrix. +pub static DEF_LUMA_QUANT: [u8; 64] = [ + 16, 11, 12, 14, 12, 10, 16, 14, + 13, 14, 18, 17, 16, 19, 24, 40, + 26, 24, 22, 22, 24, 49, 35, 37, + 29, 40, 58, 51, 61, 60, 57, 51, + 56, 55, 64, 72, 92, 78, 64, 68, + 87, 69, 55, 56, 80, 109, 81, 87, + 95, 98, 103, 104, 103, 62, 77, 113, + 121, 112, 100, 120, 92, 101, 103, 99 +]; +/// Default JPEG luma quantisation matrix. +pub static DEF_CHROMA_QUANT: [u8; 64] = [ + 17, 18, 18, 24, 21, 24, 47, 26, + 26, 47, 99, 66, 56, 66, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99 +]; + + +pub static DC_LENS: [[u8; 16]; 2] = [ + [ 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 ], + [ 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 ] +]; +pub static DC_SYMS: [u8; 12] = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 ]; +pub static AC_LENS: [[u8; 16]; 2] = [ + [ 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 125 ], + [ 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 119 ] +]; +pub static AC_SYMS: [&[u8]; 2] = [ + &[ + 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, + 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, + 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, + 0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, + 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16, + 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28, + 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, + 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, + 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, + 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, + 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, + 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, + 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, + 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, + 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, + 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, + 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, + 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, + 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, + 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, + 0xf9, 0xfa + ], + &[ + 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, + 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, + 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, + 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, + 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, + 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, + 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, + 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, + 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, + 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, + 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, + 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, + 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, + 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, + 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, + 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, + 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, + 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, + 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, + 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, + 0xf9, 0xfa + ] +]; diff --git a/nihav-codec-support/src/codecs/mod.rs b/nihav-codec-support/src/codecs/mod.rs index 60d665c..f6169b1 100644 --- a/nihav-codec-support/src/codecs/mod.rs +++ b/nihav-codec-support/src/codecs/mod.rs @@ -273,6 +273,9 @@ impl fmt::Display for MV { #[cfg(any(feature="blockdsp"))] pub mod blockdsp; +#[cfg(feature="jpeg")] +pub mod jpeg; + #[cfg(feature="h263")] #[allow(clippy::collapsible_if)] #[allow(clippy::manual_memcpy)]