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Improve EALayer performance a bit by using static bitreader

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This commit is contained in:
bnnm 2020-07-31 16:49:07 +02:00
parent f7526e3735
commit 78ea507e0e
5 changed files with 191 additions and 92 deletions
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91
src/coding/mpeg_bitreader.h Normal file
View File

@ -0,0 +1,91 @@
#ifndef _MPEG_BITREADER_H
#define _MPEG_BITREADER_H
/* Simple bitreader for MPEG/standard bit format.
* Kept in .h since it's slightly faster (compiler can optimize statics better) */
typedef struct {
uint8_t* buf; /* buffer to read/write */
size_t bufsize; /* max size of the buffer */
uint32_t b_off; /* current offset in bits inside the buffer */
} bitstream_t;
/* convenience util */
static void init_bitstream(bitstream_t* b, uint8_t* buf, size_t bufsize) {
b->buf = buf;
b->bufsize = bufsize;
b->b_off = 0;
}
/* Read bits (max 32) from buf and update the bit offset. Order is BE (MSF). */
static int rb_bits(bitstream_t* ib, uint32_t bits, uint32_t* value) {
uint32_t shift, pos, val;
int i, bit_buf, bit_val;
if (bits > 32 || ib->b_off + bits > ib->bufsize * 8)
goto fail;
pos = ib->b_off / 8; /* byte offset */
shift = ib->b_off % 8; /* bit sub-offset */
val = 0;
for (i = 0; i < bits; i++) {
bit_buf = (1U << (8-1-shift)) & 0xFF; /* bit check for buf */
bit_val = (1U << (bits-1-i)); /* bit to set in value */
if (ib->buf[pos] & bit_buf) /* is bit in buf set? */
val |= bit_val; /* set bit */
shift++;
if (shift % 8 == 0) { /* new byte starts */
shift = 0;
pos++;
}
}
*value = val;
ib->b_off += bits;
return 1;
fail:
VGM_LOG("BITREADER: read fail\n");
*value = 0;
return 0;
}
#ifndef BITSTREAM_READ_ONLY
/* Write bits (max 32) to buf and update the bit offset. Order is BE (MSF). */
static int wb_bits(bitstream_t* ob, uint32_t bits, uint32_t value) {
uint32_t shift, pos;
int i, bit_val, bit_buf;
if (bits > 32 || ob->b_off + bits > ob->bufsize * 8)
goto fail;
pos = ob->b_off / 8; /* byte offset */
shift = ob->b_off % 8; /* bit sub-offset */
for (i = 0; i < bits; i++) {
bit_val = (1U << (bits-1-i)); /* bit check for value */
bit_buf = (1U << (8-1-shift)) & 0xFF; /* bit to set in buf */
if (value & bit_val) /* is bit in val set? */
ob->buf[pos] |= bit_buf; /* set bit */
else
ob->buf[pos] &= ~bit_buf; /* unset bit */
shift++;
if (shift % 8 == 0) { /* new byte starts */
shift = 0;
pos++;
}
}
ob->b_off += bits;
return 1;
fail:
return 0;
}
#endif
#endif

166
src/coding/mpeg_custom_utils_ealayer3.c
View File

@ -1,4 +1,5 @@
#include "mpeg_decoder.h"
#include "mpeg_bitreader.h"
#ifdef VGM_USE_MPEG
@ -27,9 +28,9 @@
/* helper to pass around */
typedef struct {
STREAMFILE *sf;
STREAMFILE* sf;
off_t offset;
vgm_bitstream is;
bitstream_t is;
uint8_t buf[EALAYER3_MAX_EA_FRAME_SIZE];
int leftover_bits;
} ealayer3_buffer_t;
@ -82,21 +83,21 @@ typedef struct {
} ealayer3_frame_t;
static int ealayer3_parse_frame(mpeg_codec_data *data, int num_stream, ealayer3_buffer_t *ib, ealayer3_frame_t *eaf);
static int ealayer3_parse_frame_v1(ealayer3_buffer_t *ib, ealayer3_frame_t *eaf, int channels_per_frame, int is_v1b);
static int ealayer3_parse_frame_v2(ealayer3_buffer_t *ib, ealayer3_frame_t *eaf);
static int ealayer3_parse_frame_common(ealayer3_buffer_t *ib, ealayer3_frame_t *eaf);
static int ealayer3_rebuild_mpeg_frame(vgm_bitstream *is_0, ealayer3_frame_t *eaf_0, vgm_bitstream *is_1, ealayer3_frame_t *eaf_1, vgm_bitstream *os);
static int ealayer3_write_pcm_block(VGMSTREAMCHANNEL *stream, mpeg_codec_data *data, int num_stream, ealayer3_frame_t *eaf);
static int ealayer3_skip_data(VGMSTREAMCHANNEL *stream, mpeg_codec_data *data, int num_stream, int at_start);
static int ealayer3_is_empty_frame_v2p(STREAMFILE *sf, off_t offset);
static int ealayer3_parse_frame(mpeg_codec_data* data, int num_stream, ealayer3_buffer_t* ib, ealayer3_frame_t* eaf);
static int ealayer3_parse_frame_v1(ealayer3_buffer_t* ib, ealayer3_frame_t* eaf, int channels_per_frame, int is_v1b);
static int ealayer3_parse_frame_v2(ealayer3_buffer_t* ib, ealayer3_frame_t* eaf);
static int ealayer3_parse_frame_common(ealayer3_buffer_t* ib, ealayer3_frame_t* eaf);
static int ealayer3_rebuild_mpeg_frame(bitstream_t* is_0, ealayer3_frame_t* eaf_0, bitstream_t* is_1, ealayer3_frame_t* eaf_1, bitstream_t* os);
static int ealayer3_write_pcm_block(VGMSTREAMCHANNEL* stream, mpeg_codec_data* data, int num_stream, ealayer3_frame_t* eaf);
static int ealayer3_skip_data(VGMSTREAMCHANNEL* stream, mpeg_codec_data* data, int num_stream, int at_start);
static int ealayer3_is_empty_frame_v2p(STREAMFILE* sf, off_t offset);
/* **************************************************************************** */
/* EXTERNAL API */
/* **************************************************************************** */
/* init codec from an EALayer3 frame */
int mpeg_custom_setup_init_ealayer3(STREAMFILE *streamfile, off_t start_offset, mpeg_codec_data *data, coding_t *coding_type) {
int mpeg_custom_setup_init_ealayer3(STREAMFILE* streamfile, off_t start_offset, mpeg_codec_data* data, coding_t *coding_type) {
int ok;
ealayer3_buffer_t ib = {0};
ealayer3_frame_t eaf;
@ -130,7 +131,7 @@ fail:
}
/* writes data to the buffer and moves offsets, transforming EALayer3 frames */
int mpeg_custom_parse_frame_ealayer3(VGMSTREAMCHANNEL *stream, mpeg_codec_data *data, int num_stream) {
int mpeg_custom_parse_frame_ealayer3(VGMSTREAMCHANNEL* stream, mpeg_codec_data* data, int num_stream) {
mpeg_custom_stream *ms = data->streams[num_stream];
int ok, granule_found;
ealayer3_buffer_t ib_0 = {0}, ib_1 = {0};
@ -219,10 +220,9 @@ int mpeg_custom_parse_frame_ealayer3(VGMSTREAMCHANNEL *stream, mpeg_codec_data *
/* rebuild EALayer3 frame to MPEG frame */
{
vgm_bitstream os = {0};
bitstream_t os = {0};
os.buf = ms->buffer;
os.bufsize = ms->buffer_size;
init_bitstream(&os, ms->buffer, ms->buffer_size);
ok = ealayer3_rebuild_mpeg_frame(&ib_0.is, &eaf_0, &ib_1.is, &eaf_1, &os);
if (!ok) goto fail;
@ -243,7 +243,7 @@ fail:
/* Read at most N bits from streamfile. This makes more smaller reads (not good) but
* allows exact frame size reading (good), as reading over a frame then reading back
* is expensive in EALayer3 since it uses custom streamfiles. */
static void fill_buf(ealayer3_buffer_t *ib, int bits) {
static void fill_buf(ealayer3_buffer_t* ib, int bits) {
size_t read_size, bytes_size;
int mod;
@ -273,7 +273,7 @@ static void fill_buf(ealayer3_buffer_t *ib, int bits) {
ib->leftover_bits = (mod > 0 ? 8 - mod : 0);
}
static int ealayer3_parse_frame(mpeg_codec_data *data, int num_stream, ealayer3_buffer_t *ib, ealayer3_frame_t *eaf) {
static int ealayer3_parse_frame(mpeg_codec_data* data, int num_stream, ealayer3_buffer_t* ib, ealayer3_frame_t* eaf) {
int ok;
/* We must pass this from state, as not all EA-frames have channel info.
@ -302,14 +302,14 @@ fail:
/* read V1"a" (in SCHl) and V1"b" (in SNS) EALayer3 frame */
static int ealayer3_parse_frame_v1(ealayer3_buffer_t *ib, ealayer3_frame_t *eaf, int channels_per_frame, int is_v1b) {
static int ealayer3_parse_frame_v1(ealayer3_buffer_t* ib, ealayer3_frame_t* eaf, int channels_per_frame, int is_v1b) {
int ok;
vgm_bitstream *is = &ib->is;
bitstream_t* is = &ib->is;
/* read EA-frame V1 header */
fill_buf(ib, 8);
r_bits(is, 8,&eaf->v1_pcm_flag);
rb_bits(is, 8,&eaf->v1_pcm_flag);
eaf->pre_size = 1; /* 8b */
@ -331,15 +331,15 @@ static int ealayer3_parse_frame_v1(ealayer3_buffer_t *ib, ealayer3_frame_t *eaf,
/* check PCM block */
if (eaf->v1_pcm_flag == 0xEE) {
fill_buf(ib, 32);
r_bits(is, 16,&eaf->v1_offset_samples); /* PCM block offset in the buffer */
r_bits(is, 16,&eaf->v1_pcm_samples); /* number of PCM samples, can be 0 */
rb_bits(is, 16,&eaf->v1_offset_samples); /* PCM block offset in the buffer */
rb_bits(is, 16,&eaf->v1_pcm_samples); /* number of PCM samples, can be 0 */
eaf->pre_size += 2+2; /* 16b+16b */
eaf->pcm_size = (2*eaf->v1_pcm_samples * channels_per_frame);
if (is_v1b) { /* extra 32b in v1b */
fill_buf(ib, 32);
r_bits(is, 32,&eaf->v1_pcm_unknown);
rb_bits(is, 32,&eaf->v1_pcm_unknown);
eaf->pre_size += 4; /* 32b */
@ -356,26 +356,26 @@ fail:
/* read V2"PCM" and V2"Spike" EALayer3 frame (exactly the same but V2P seems to have bigger
* PCM blocks and maybe smaller frames) */
static int ealayer3_parse_frame_v2(ealayer3_buffer_t *ib, ealayer3_frame_t *eaf) {
static int ealayer3_parse_frame_v2(ealayer3_buffer_t* ib, ealayer3_frame_t* eaf) {
int ok;
vgm_bitstream *is = &ib->is;
bitstream_t* is = &ib->is;
/* read EA-frame V2 header */
fill_buf(ib, 16);
r_bits(is, 1,&eaf->v2_extended_flag);
r_bits(is, 1,&eaf->v2_stereo_flag);
r_bits(is, 2,&eaf->v2_reserved);
r_bits(is, 12,&eaf->v2_frame_size);
rb_bits(is, 1,&eaf->v2_extended_flag);
rb_bits(is, 1,&eaf->v2_stereo_flag);
rb_bits(is, 2,&eaf->v2_reserved);
rb_bits(is, 12,&eaf->v2_frame_size);
eaf->pre_size = 2; /* 16b */
if (eaf->v2_extended_flag) {
fill_buf(ib, 32);
r_bits(is, 2,&eaf->v2_offset_mode);
r_bits(is, 10,&eaf->v2_offset_samples);
r_bits(is, 10,&eaf->v2_pcm_samples);
r_bits(is, 10,&eaf->v2_common_size);
rb_bits(is, 2,&eaf->v2_offset_mode);
rb_bits(is, 10,&eaf->v2_offset_samples);
rb_bits(is, 10,&eaf->v2_pcm_samples);
rb_bits(is, 10,&eaf->v2_common_size);
eaf->pre_size += 4; /* 32b */
}
@ -406,7 +406,7 @@ fail:
/* parses an EALayer3 frame (common part) */
static int ealayer3_parse_frame_common(ealayer3_buffer_t *ib, ealayer3_frame_t *eaf) {
static int ealayer3_parse_frame_common(ealayer3_buffer_t* ib, ealayer3_frame_t* eaf) {
/* index tables */
static const int versions[4] = { /* MPEG 2.5 */ 3, /* reserved */ -1, /* MPEG 2 */ 2, /* MPEG 1 */ 1 };
static const int sample_rates[4][4] = { /* [version_index][sample rate index] */
@ -417,17 +417,17 @@ static int ealayer3_parse_frame_common(ealayer3_buffer_t *ib, ealayer3_frame_t *
};
static const int channels[4] = { 2,2,2, 1 }; /* [channel_mode] */
vgm_bitstream *is = &ib->is;
bitstream_t* is = &ib->is;
off_t start_b_off = is->b_off;
int i, fill_bits, others_2_bits;
/* read main header */
fill_buf(ib, 8);
r_bits(is, 2,&eaf->version_index);
r_bits(is, 2,&eaf->sample_rate_index);
r_bits(is, 2,&eaf->channel_mode);
r_bits(is, 2,&eaf->mode_extension);
rb_bits(is, 2,&eaf->version_index);
rb_bits(is, 2,&eaf->sample_rate_index);
rb_bits(is, 2,&eaf->channel_mode);
rb_bits(is, 2,&eaf->mode_extension);
/* check empty frame */
@ -455,7 +455,7 @@ static int ealayer3_parse_frame_common(ealayer3_buffer_t *ib, ealayer3_frame_t *
/* read side info */
fill_buf(ib, 1);
r_bits(is, 1,&eaf->granule_index);
rb_bits(is, 1,&eaf->granule_index);
fill_bits = (eaf->mpeg1 && eaf->granule_index == 1) ? 4 * eaf->channels : 0;
fill_bits = fill_bits + (12 + 32 + others_2_bits) * eaf->channels;
@ -463,15 +463,15 @@ static int ealayer3_parse_frame_common(ealayer3_buffer_t *ib, ealayer3_frame_t *
if (eaf->mpeg1 && eaf->granule_index == 1) {
for (i = 0; i < eaf->channels; i++) {
r_bits(is, 4,&eaf->scfsi[i]);
rb_bits(is, 4,&eaf->scfsi[i]);
}
}
for (i = 0; i < eaf->channels; i++) {
r_bits(is, 12,&eaf->main_data_size[i]);
rb_bits(is, 12,&eaf->main_data_size[i]);
/* divided in 47b=32+15 (MPEG1) or 51b=32+19 (MPEG2), arbitrarily */
r_bits(is, 32,&eaf->others_1[i]);
r_bits(is, others_2_bits,&eaf->others_2[i]);
rb_bits(is, 32,&eaf->others_1[i]);
rb_bits(is, others_2_bits,&eaf->others_2[i]);
}
@ -496,7 +496,7 @@ fail:
/* converts an EALAYER3 frame to a standard MPEG frame from pre-parsed info */
static int ealayer3_rebuild_mpeg_frame(vgm_bitstream *is_0, ealayer3_frame_t *eaf_0, vgm_bitstream *is_1, ealayer3_frame_t *eaf_1, vgm_bitstream* os) {
static int ealayer3_rebuild_mpeg_frame(bitstream_t* is_0, ealayer3_frame_t* eaf_0, bitstream_t* is_1, ealayer3_frame_t* eaf_1, bitstream_t* os) {
uint32_t c = 0;
int i, j;
int expected_bitrate_index, expected_frame_size;
@ -537,55 +537,55 @@ static int ealayer3_rebuild_mpeg_frame(vgm_bitstream *is_0, ealayer3_frame_t *ea
#endif
/* write MPEG1/2 frame header */
w_bits(os, 11, 0x7FF); /* sync */
w_bits(os, 2, eaf_0->version_index);
w_bits(os, 2, 0x01); /* layer III index */
w_bits(os, 1, 1); /* "no CRC" flag */
w_bits(os, 4, expected_bitrate_index);
w_bits(os, 2, eaf_0->sample_rate_index);
w_bits(os, 1, 0); /* padding */
w_bits(os, 1, 0); /* private */
w_bits(os, 2, eaf_0->channel_mode);
w_bits(os, 2, eaf_0->mode_extension);
w_bits(os, 1, 1); /* copyrighted */
w_bits(os, 1, 1); /* original */
w_bits(os, 2, 0); /* emphasis */
wb_bits(os, 11, 0x7FF); /* sync */
wb_bits(os, 2, eaf_0->version_index);
wb_bits(os, 2, 0x01); /* layer III index */
wb_bits(os, 1, 1); /* "no CRC" flag */
wb_bits(os, 4, expected_bitrate_index);
wb_bits(os, 2, eaf_0->sample_rate_index);
wb_bits(os, 1, 0); /* padding */
wb_bits(os, 1, 0); /* private */
wb_bits(os, 2, eaf_0->channel_mode);
wb_bits(os, 2, eaf_0->mode_extension);
wb_bits(os, 1, 1); /* copyrighted */
wb_bits(os, 1, 1); /* original */
wb_bits(os, 2, 0); /* emphasis */
if (eaf_0->mpeg1) {
int private_bits = (eaf_0->channels==1 ? 5 : 3);
/* write MPEG1 side info */
w_bits(os, 9, 0); /* main data start (no bit reservoir) */
w_bits(os, private_bits, 0);
wb_bits(os, 9, 0); /* main data start (no bit reservoir) */
wb_bits(os, private_bits, 0);
for (i = 0; i < eaf_1->channels; i++) {
w_bits(os, 4, eaf_1->scfsi[i]); /* saved in granule1 only */
wb_bits(os, 4, eaf_1->scfsi[i]); /* saved in granule1 only */
}
for (i = 0; i < eaf_0->channels; i++) { /* granule0 */
w_bits(os, 12, eaf_0->main_data_size[i]);
w_bits(os, 32, eaf_0->others_1[i]);
w_bits(os, 47-32, eaf_0->others_2[i]);
wb_bits(os, 12, eaf_0->main_data_size[i]);
wb_bits(os, 32, eaf_0->others_1[i]);
wb_bits(os, 47-32, eaf_0->others_2[i]);
}
for (i = 0; i < eaf_1->channels; i++) { /* granule1 */
w_bits(os, 12, eaf_1->main_data_size[i]);
w_bits(os, 32, eaf_1->others_1[i]);
w_bits(os, 47-32, eaf_1->others_2[i]);
wb_bits(os, 12, eaf_1->main_data_size[i]);
wb_bits(os, 32, eaf_1->others_1[i]);
wb_bits(os, 47-32, eaf_1->others_2[i]);
}
/* write MPEG1 main data */
is_0->b_off = eaf_0->data_offset_b;
for (i = 0; i < eaf_0->channels; i++) { /* granule0 */
for (j = 0; j < eaf_0->main_data_size[i]; j++) {
r_bits(is_0, 1, &c);
w_bits(os, 1, c);
rb_bits(is_0, 1, &c);
wb_bits(os, 1, c);
}
}
is_1->b_off = eaf_1->data_offset_b;
for (i = 0; i < eaf_1->channels; i++) { /* granule1 */
for (j = 0; j < eaf_1->main_data_size[i]; j++) {
r_bits(is_1, 1, &c);
w_bits(os, 1, c);
rb_bits(is_1, 1, &c);
wb_bits(os, 1, c);
}
}
}
@ -593,21 +593,21 @@ static int ealayer3_rebuild_mpeg_frame(vgm_bitstream *is_0, ealayer3_frame_t *ea
int private_bits = (eaf_0->channels==1 ? 1 : 2);
/* write MPEG2 side info */
w_bits(os, 8, 0); /* main data start (no bit reservoir) */
w_bits(os, private_bits, 0);
wb_bits(os, 8, 0); /* main data start (no bit reservoir) */
wb_bits(os, private_bits, 0);
for (i = 0; i < eaf_0->channels; i++) {
w_bits(os, 12, eaf_0->main_data_size[i]);
w_bits(os, 32, eaf_0->others_1[i]);
w_bits(os, 51-32, eaf_0->others_2[i]);
wb_bits(os, 12, eaf_0->main_data_size[i]);
wb_bits(os, 32, eaf_0->others_1[i]);
wb_bits(os, 51-32, eaf_0->others_2[i]);
}
/* write MPEG2 main data */
is_0->b_off = eaf_0->data_offset_b;
for (i = 0; i < eaf_0->channels; i++) {
for (j = 0; j < eaf_0->main_data_size[i]; j++) {
r_bits(is_0, 1, &c);
w_bits(os, 1, c);
rb_bits(is_0, 1, &c);
wb_bits(os, 1, c);
}
}
}
@ -615,7 +615,7 @@ static int ealayer3_rebuild_mpeg_frame(vgm_bitstream *is_0, ealayer3_frame_t *ea
/* align to closest 8b */
if (os->b_off % 8) {
int align_bits = 8 - (os->b_off % 8);
w_bits(os, align_bits, 0);
wb_bits(os, align_bits, 0);
}
@ -636,7 +636,7 @@ fail:
return 0;
}
static void ealayer3_copy_pcm_block(uint8_t* outbuf, off_t pcm_offset, int pcm_number, int channels_per_frame, int is_packed, STREAMFILE *sf) {
static void ealayer3_copy_pcm_block(uint8_t* outbuf, off_t pcm_offset, int pcm_number, int channels_per_frame, int is_packed, STREAMFILE* sf) {
int i, ch;
uint8_t pcm_block[1152 * 2 * 2]; /* assumed max: 1 MPEG frame samples * 16b * max channels */
size_t pcm_size = pcm_number * 2 * channels_per_frame;
@ -687,7 +687,7 @@ static void ealayer3_copy_pcm_block(uint8_t* outbuf, off_t pcm_offset, int pcm_n
/* write PCM block directly to sample buffer and setup decode discard (EALayer3 seems to use this as a prefetch of sorts).
* Seems to alter decoded sample buffer to handle encoder delay/padding in a twisted way. */
static int ealayer3_write_pcm_block(VGMSTREAMCHANNEL *stream, mpeg_codec_data *data, int num_stream, ealayer3_frame_t *eaf) {
static int ealayer3_write_pcm_block(VGMSTREAMCHANNEL* stream, mpeg_codec_data* data, int num_stream, ealayer3_frame_t* eaf) {
mpeg_custom_stream *ms = data->streams[num_stream];
int channels_per_frame = ms->channels_per_frame;
size_t bytes_filled;
@ -817,7 +817,7 @@ fail:
*
* EALayer3 v1 in SCHl uses external offsets and 1ch multichannel instead.
*/
static int ealayer3_skip_data(VGMSTREAMCHANNEL *stream, mpeg_codec_data *data, int num_stream, int at_start) {
static int ealayer3_skip_data(VGMSTREAMCHANNEL* stream, mpeg_codec_data* data, int num_stream, int at_start) {
int ok, i;
ealayer3_buffer_t ib = {0};
ealayer3_frame_t eaf;
@ -845,7 +845,7 @@ fail:
return 0;
}
static int ealayer3_is_empty_frame_v2p(STREAMFILE *sf, off_t offset) {
static int ealayer3_is_empty_frame_v2p(STREAMFILE* sf, off_t offset) {
/* V2P frame header should contain a valid frame size (lower 12b) */
uint16_t v2_header = read_u16be(offset, sf);
return (v2_header % 0xFFF) == 0 || v2_header == 0xFFFF;

4
src/libvgmstream.vcproj
View File

@ -2002,6 +2002,10 @@
RelativePath=".\coding\g72x_state.h"
>
</File>
<File
RelativePath=".\coding\mpeg_bitreader.h"
>
</File>
<File
RelativePath=".\coding\mpeg_decoder.h"
>

1
src/libvgmstream.vcxproj
View File

@ -84,6 +84,7 @@
</ItemDefinitionGroup>
<ItemGroup>
<ClInclude Include="..\ext_includes\clHCA.h" />
<ClInclude Include="coding\mpeg_bitreader.h" />
<ClInclude Include="coding\mpeg_decoder.h" />
<ClInclude Include="coding\vorbis_bitreader.h" />
<ClInclude Include="coding\vorbis_custom_data_fsb.h" />

3
src/libvgmstream.vcxproj.filters
View File

@ -242,6 +242,9 @@
<ClInclude Include="..\ext_includes\clHCA.h">
<Filter>ext_libs\Header Files</Filter>
</ClInclude>
<ClInclude Include="coding\mpeg_bitreader.h">
<Filter>coding\Header Files</Filter>
</ClInclude>
<ClInclude Include="coding\mpeg_decoder.h">
<Filter>coding\Header Files</Filter>
</ClInclude>