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ffmpeg/libavcodec/speedhqenc.c

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/*
* SpeedHQ encoder
* Copyright (c) 2000, 2001 Fabrice Bellard
* Copyright (c) 2003 Alex Beregszaszi
* Copyright (c) 2003-2004 Michael Niedermayer
* Copyright (c) 2020 FFmpeg
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* SpeedHQ encoder.
*/
#include "libavutil/thread.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "mpeg12data.h"
#include "mpeg12vlc.h"
#include "mpegvideo.h"
#include "mpegvideodata.h"
#include "mpegvideoenc.h"
#include "rl.h"
#include "speedhq.h"
#include "speedhqenc.h"
static uint8_t speedhq_max_level[MAX_LEVEL + 1];
static uint8_t speedhq_index_run[MAX_RUN + 1];
/* Exactly the same as MPEG-2, except little-endian. */
static const uint16_t mpeg12_vlc_dc_lum_code_reversed[12] = {
0x1, 0x0, 0x2, 0x5, 0x3, 0x7, 0xF, 0x1F, 0x3F, 0x7F, 0xFF, 0x1FF
};
static const uint16_t mpeg12_vlc_dc_chroma_code_reversed[12] = {
0x0, 0x2, 0x1, 0x3, 0x7, 0xF, 0x1F, 0x3F, 0x7F, 0xFF, 0x1FF, 0x3FF
};
/* simple include everything table for dc, first byte is bits
* number next 3 are code */
static uint32_t speedhq_lum_dc_uni[512];
static uint32_t speedhq_chr_dc_uni[512];
static uint8_t uni_speedhq_ac_vlc_len[64 * 64 * 2];
typedef struct SpeedHQEncContext {
MpegEncContext m;
int slice_start;
} SpeedHQEncContext;
static av_cold void speedhq_init_static_data(void)
{
ff_rl_init_level_run(speedhq_max_level, speedhq_index_run,
ff_speedhq_run, ff_speedhq_level, SPEEDHQ_RL_NB_ELEMS);
/* build unified dc encoding tables */
for (int i = -255; i < 256; i++) {
int adiff, index;
int bits, code;
int diff = i;
adiff = FFABS(diff);
if (diff < 0)
diff--;
index = av_log2(2 * adiff);
bits = ff_mpeg12_vlc_dc_lum_bits[index] + index;
code = mpeg12_vlc_dc_lum_code_reversed[index] +
(av_mod_uintp2(diff, index) << ff_mpeg12_vlc_dc_lum_bits[index]);
speedhq_lum_dc_uni[i + 255] = bits + (code << 8);
bits = ff_mpeg12_vlc_dc_chroma_bits[index] + index;
code = mpeg12_vlc_dc_chroma_code_reversed[index] +
(av_mod_uintp2(diff, index) << ff_mpeg12_vlc_dc_chroma_bits[index]);
speedhq_chr_dc_uni[i + 255] = bits + (code << 8);
}
ff_mpeg1_init_uni_ac_vlc(speedhq_max_level, speedhq_index_run,
ff_speedhq_vlc_table, uni_speedhq_ac_vlc_len);
}
av_cold int ff_speedhq_encode_init(MpegEncContext *s)
{
static AVOnce init_static_once = AV_ONCE_INIT;
if (s->width > 65500 || s->height > 65500) {
av_log(s, AV_LOG_ERROR, "SpeedHQ does not support resolutions above 65500x65500\n");
return AVERROR(EINVAL);
}
s->min_qcoeff = -2048;
s->max_qcoeff = 2047;
ff_thread_once(&init_static_once, speedhq_init_static_data);
s->intra_ac_vlc_length =
s->intra_ac_vlc_last_length =
s->intra_chroma_ac_vlc_length =
s->intra_chroma_ac_vlc_last_length = uni_speedhq_ac_vlc_len;
s->y_dc_scale_table =
s->c_dc_scale_table = ff_mpeg12_dc_scale_table[3];
switch (s->avctx->pix_fmt) {
case AV_PIX_FMT_YUV420P:
s->avctx->codec_tag = MKTAG('S','H','Q','0');
break;
case AV_PIX_FMT_YUV422P:
s->avctx->codec_tag = MKTAG('S','H','Q','2');
break;
case AV_PIX_FMT_YUV444P:
s->avctx->codec_tag = MKTAG('S','H','Q','4');
break;
default:
av_assert0(0);
}
return 0;
}
void ff_speedhq_encode_picture_header(MpegEncContext *s)
{
SpeedHQEncContext *ctx = (SpeedHQEncContext*)s;
put_bits_le(&s->pb, 8, 100 - s->qscale * 2); /* FIXME why doubled */
put_bits_le(&s->pb, 24, 4); /* no second field */
ctx->slice_start = 4;
/* length of first slice, will be filled out later */
put_bits_le(&s->pb, 24, 0);
}
void ff_speedhq_end_slice(MpegEncContext *s)
{
SpeedHQEncContext *ctx = (SpeedHQEncContext*)s;
int slice_len;
flush_put_bits_le(&s->pb);
slice_len = put_bytes_output(&s->pb) - ctx->slice_start;
AV_WL24(s->pb.buf + ctx->slice_start, slice_len);
/* length of next slice, will be filled out later */
ctx->slice_start = put_bytes_output(&s->pb);
put_bits_le(&s->pb, 24, 0);
}
static inline void encode_dc(PutBitContext *pb, int diff, int component)
{
unsigned int diff_u = diff + 255;
if (diff_u >= 511) {
int index;
if (diff < 0) {
index = av_log2_16bit(-2 * diff);
diff--;
} else {
index = av_log2_16bit(2 * diff);
}
if (component == 0)
put_bits_le(pb,
ff_mpeg12_vlc_dc_lum_bits[index] + index,
mpeg12_vlc_dc_lum_code_reversed[index] +
(av_mod_uintp2(diff, index) << ff_mpeg12_vlc_dc_lum_bits[index]));
else
put_bits_le(pb,
ff_mpeg12_vlc_dc_chroma_bits[index] + index,
mpeg12_vlc_dc_chroma_code_reversed[index] +
(av_mod_uintp2(diff, index) << ff_mpeg12_vlc_dc_chroma_bits[index]));
} else {
if (component == 0)
put_bits_le(pb,
speedhq_lum_dc_uni[diff + 255] & 0xFF,
speedhq_lum_dc_uni[diff + 255] >> 8);
else
put_bits_le(pb,
speedhq_chr_dc_uni[diff + 255] & 0xFF,
speedhq_chr_dc_uni[diff + 255] >> 8);
}
}
static void encode_block(MpegEncContext *s, int16_t *block, int n)
{
int alevel, level, last_non_zero, dc, i, j, run, last_index, sign;
int code;
int component, val;
/* DC coef */
component = (n <= 3 ? 0 : (n&1) + 1);
dc = block[0]; /* overflow is impossible */
val = s->last_dc[component] - dc; /* opposite of most codecs */
encode_dc(&s->pb, val, component);
s->last_dc[component] = dc;
/* now quantify & encode AC coefs */
last_non_zero = 0;
last_index = s->block_last_index[n];
for (i = 1; i <= last_index; i++) {
j = s->intra_scantable.permutated[i];
level = block[j];
/* encode using VLC */
if (level != 0) {
run = i - last_non_zero - 1;
alevel = level;
MASK_ABS(sign, alevel);
sign &= 1;
if (alevel <= speedhq_max_level[run]) {
code = speedhq_index_run[run] + alevel - 1;
/* store the VLC & sign at once */
put_bits_le(&s->pb, ff_speedhq_vlc_table[code][1] + 1,
ff_speedhq_vlc_table[code][0] | (sign << ff_speedhq_vlc_table[code][1]));
} else {
/* escape seems to be pretty rare <5% so I do not optimize it;
* the values correspond to ff_speedhq_vlc_table[121] */
put_bits_le(&s->pb, 6, 32);
/* escape: only clip in this case */
put_bits_le(&s->pb, 6, run);
put_bits_le(&s->pb, 12, level + 2048);
}
last_non_zero = i;
}
}
/* end of block; the values correspond to ff_speedhq_vlc_table[122] */
put_bits_le(&s->pb, 4, 6);
}
void ff_speedhq_encode_mb(MpegEncContext *s, int16_t block[12][64])
{
int i;
for(i=0;i<6;i++) {
encode_block(s, block[i], i);
}
if (s->chroma_format == CHROMA_444) {
encode_block(s, block[8], 8);
encode_block(s, block[9], 9);
encode_block(s, block[6], 6);
encode_block(s, block[7], 7);
encode_block(s, block[10], 10);
encode_block(s, block[11], 11);
} else if (s->chroma_format == CHROMA_422) {
encode_block(s, block[6], 6);
encode_block(s, block[7], 7);
}
s->i_tex_bits += get_bits_diff(s);
}
static int ff_speedhq_mb_rows_in_slice(int slice_num, int mb_height)
{
return mb_height / 4 + (slice_num < (mb_height % 4));
}
int ff_speedhq_mb_y_order_to_mb(int mb_y_order, int mb_height, int *first_in_slice)
{
int slice_num = 0;
while (mb_y_order >= ff_speedhq_mb_rows_in_slice(slice_num, mb_height)) {
mb_y_order -= ff_speedhq_mb_rows_in_slice(slice_num, mb_height);
slice_num++;
}
*first_in_slice = (mb_y_order == 0);
return mb_y_order * 4 + slice_num;
}
const FFCodec ff_speedhq_encoder = {
.p.name = "speedhq",
CODEC_LONG_NAME("NewTek SpeedHQ"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_SPEEDHQ,
.p.priv_class = &ff_mpv_enc_class,
.p.capabilities = AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
.priv_data_size = sizeof(SpeedHQEncContext),
.init = ff_mpv_encode_init,
FF_CODEC_ENCODE_CB(ff_mpv_encode_picture),
.close = ff_mpv_encode_end,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
.p.pix_fmts = (const enum AVPixelFormat[]) {
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P,
AV_PIX_FMT_NONE
},
};
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