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FFmpeg/libavcodec/vc2enc.c
Andreas Rheinhardt d2dc6440e6 avcodec/vc2enc: Don't use bitcount when byte-aligned 
(There is a small issue that is now being treated differently:
The earlier code would record a position in a buffer that
is being written to via put_bits(), then write data,
then overwrite the byte at the position recorded earlier
and only then flush the PutBitContext. In case there was
no writeout in the meantime, said flush would overwrite
what one has just written. This never happened in my tests,
but maybe it can happen. In this case this commit fixes
this issue by flushing before overwriting the old data.)

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-10-09 19:31:47 +02:00

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/*
* Copyright (C) 2016 Open Broadcast Systems Ltd.
* Author 2016 Rostislav Pehlivanov <atomnuker@gmail.com>
*
* 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
*/
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "libavutil/version.h"
#include "codec_internal.h"
#include "dirac.h"
#include "encode.h"
#include "put_bits.h"
#include "version.h"
#include "vc2enc_dwt.h"
#include "diractab.h"
/* The limited size resolution of each slice forces us to do this */
#define SSIZE_ROUND(b) (FFALIGN((b), s->size_scaler) + 4 + s->prefix_bytes)
/* Decides the cutoff point in # of slices to distribute the leftover bytes */
#define SLICE_REDIST_TOTAL 150
typedef struct VC2BaseVideoFormat {
enum AVPixelFormat pix_fmt;
AVRational time_base;
int width, height, interlaced, level;
const char *name;
} VC2BaseVideoFormat;
static const VC2BaseVideoFormat base_video_fmts[] = {
{ 0 }, /* Custom format, here just to make indexing equal to base_vf */
{ AV_PIX_FMT_YUV420P, { 1001, 15000 }, 176, 120, 0, 1, "QSIF525" },
{ AV_PIX_FMT_YUV420P, { 2, 25 }, 176, 144, 0, 1, "QCIF" },
{ AV_PIX_FMT_YUV420P, { 1001, 15000 }, 352, 240, 0, 1, "SIF525" },
{ AV_PIX_FMT_YUV420P, { 2, 25 }, 352, 288, 0, 1, "CIF" },
{ AV_PIX_FMT_YUV420P, { 1001, 15000 }, 704, 480, 0, 1, "4SIF525" },
{ AV_PIX_FMT_YUV420P, { 2, 25 }, 704, 576, 0, 1, "4CIF" },
{ AV_PIX_FMT_YUV422P10, { 1001, 30000 }, 720, 480, 1, 2, "SD480I-60" },
{ AV_PIX_FMT_YUV422P10, { 1, 25 }, 720, 576, 1, 2, "SD576I-50" },
{ AV_PIX_FMT_YUV422P10, { 1001, 60000 }, 1280, 720, 0, 3, "HD720P-60" },
{ AV_PIX_FMT_YUV422P10, { 1, 50 }, 1280, 720, 0, 3, "HD720P-50" },
{ AV_PIX_FMT_YUV422P10, { 1001, 30000 }, 1920, 1080, 1, 3, "HD1080I-60" },
{ AV_PIX_FMT_YUV422P10, { 1, 25 }, 1920, 1080, 1, 3, "HD1080I-50" },
{ AV_PIX_FMT_YUV422P10, { 1001, 60000 }, 1920, 1080, 0, 3, "HD1080P-60" },
{ AV_PIX_FMT_YUV422P10, { 1, 50 }, 1920, 1080, 0, 3, "HD1080P-50" },
{ AV_PIX_FMT_YUV444P12, { 1, 24 }, 2048, 1080, 0, 4, "DC2K" },
{ AV_PIX_FMT_YUV444P12, { 1, 24 }, 4096, 2160, 0, 5, "DC4K" },
{ AV_PIX_FMT_YUV422P10, { 1001, 60000 }, 3840, 2160, 0, 6, "UHDTV 4K-60" },
{ AV_PIX_FMT_YUV422P10, { 1, 50 }, 3840, 2160, 0, 6, "UHDTV 4K-50" },
{ AV_PIX_FMT_YUV422P10, { 1001, 60000 }, 7680, 4320, 0, 7, "UHDTV 8K-60" },
{ AV_PIX_FMT_YUV422P10, { 1, 50 }, 7680, 4320, 0, 7, "UHDTV 8K-50" },
{ AV_PIX_FMT_YUV422P10, { 1001, 24000 }, 1920, 1080, 0, 3, "HD1080P-24" },
{ AV_PIX_FMT_YUV422P10, { 1001, 30000 }, 720, 486, 1, 2, "SD Pro486" },
};
static const int base_video_fmts_len = FF_ARRAY_ELEMS(base_video_fmts);
enum VC2_QM {
VC2_QM_DEF = 0,
VC2_QM_COL,
VC2_QM_FLAT,
VC2_QM_NB
};
typedef struct SubBand {
dwtcoef *buf;
ptrdiff_t stride;
int width;
int height;
} SubBand;
typedef struct Plane {
SubBand band[MAX_DWT_LEVELS][4];
dwtcoef *coef_buf;
int width;
int height;
int dwt_width;
int dwt_height;
ptrdiff_t coef_stride;
} Plane;
typedef struct SliceArgs {
PutBitContext pb;
int cache[DIRAC_MAX_QUANT_INDEX];
void *ctx;
int x;
int y;
int quant_idx;
int bits_ceil;
int bits_floor;
int bytes;
} SliceArgs;
typedef struct TransformArgs {
void *ctx;
Plane *plane;
const void *idata;
ptrdiff_t istride;
int field;
VC2TransformContext t;
} TransformArgs;
typedef struct VC2EncContext {
AVClass *av_class;
PutBitContext pb;
Plane plane[3];
AVCodecContext *avctx;
DiracVersionInfo ver;
SliceArgs *slice_args;
TransformArgs transform_args[3];
/* For conversion from unsigned pixel values to signed */
int diff_offset;
int bpp;
int bpp_idx;
/* Picture number */
uint32_t picture_number;
/* Base video format */
int base_vf;
int level;
int profile;
/* Quantization matrix */
uint8_t quant[MAX_DWT_LEVELS][4];
int custom_quant_matrix;
/* Division LUT */
uint32_t qmagic_lut[116][2];
int num_x; /* #slices horizontally */
int num_y; /* #slices vertically */
int prefix_bytes;
int size_scaler;
int chroma_x_shift;
int chroma_y_shift;
/* Rate control stuff */
int frame_max_bytes;
int slice_max_bytes;
int slice_min_bytes;
int q_ceil;
int q_avg;
/* Options */
double tolerance;
int wavelet_idx;
int wavelet_depth;
int strict_compliance;
int slice_height;
int slice_width;
int interlaced;
enum VC2_QM quant_matrix;
/* Parse code state */
uint32_t next_parse_offset;
enum DiracParseCodes last_parse_code;
} VC2EncContext;
static av_always_inline void put_vc2_ue_uint(PutBitContext *pb, uint32_t val)
{
int i;
int pbits = 0, bits = 0, topbit = 1, maxval = 1;
if (!val++) {
put_bits(pb, 1, 1);
return;
}
while (val > maxval) {
topbit <<= 1;
maxval <<= 1;
maxval |= 1;
}
bits = ff_log2(topbit);
for (i = 0; i < bits; i++) {
topbit >>= 1;
pbits <<= 2;
if (val & topbit)
pbits |= 0x1;
}
put_bits(pb, bits*2 + 1, (pbits << 1) | 1);
}
static av_always_inline int count_vc2_ue_uint(uint32_t val)
{
int topbit = 1, maxval = 1;
if (!val++)
return 1;
while (val > maxval) {
topbit <<= 1;
maxval <<= 1;
maxval |= 1;
}
return ff_log2(topbit)*2 + 1;
}
/* VC-2 10.4 - parse_info() */
static void encode_parse_info(VC2EncContext *s, enum DiracParseCodes pcode)
{
uint32_t cur_pos, dist;
align_put_bits(&s->pb);
cur_pos = put_bytes_count(&s->pb, 0);
/* Magic string */
ff_put_string(&s->pb, "BBCD", 0);
/* Parse code */
put_bits(&s->pb, 8, pcode);
/* Next parse offset */
dist = cur_pos - s->next_parse_offset;
AV_WB32(s->pb.buf + s->next_parse_offset + 5, dist);
s->next_parse_offset = cur_pos;
put_bits32(&s->pb, pcode == DIRAC_PCODE_END_SEQ ? 13 : 0);
/* Last parse offset */
put_bits32(&s->pb, s->last_parse_code == DIRAC_PCODE_END_SEQ ? 13 : dist);
s->last_parse_code = pcode;
}
/* VC-2 11.1 - parse_parameters()
* The level dictates what the decoder should expect in terms of resolution
* and allows it to quickly reject whatever it can't support. Remember,
* this codec kinda targets cheapo FPGAs without much memory. Unfortunately
* it also limits us greatly in our choice of formats, hence the flag to disable
* strict_compliance */
static void encode_parse_params(VC2EncContext *s)
{
put_vc2_ue_uint(&s->pb, s->ver.major); /* VC-2 demands this to be 2 */
put_vc2_ue_uint(&s->pb, s->ver.minor); /* ^^ and this to be 0 */
put_vc2_ue_uint(&s->pb, s->profile); /* 3 to signal HQ profile */
put_vc2_ue_uint(&s->pb, s->level); /* 3 - 1080/720, 6 - 4K */
}
/* VC-2 11.3 - frame_size() */
static void encode_frame_size(VC2EncContext *s)
{
put_bits(&s->pb, 1, !s->strict_compliance);
if (!s->strict_compliance) {
AVCodecContext *avctx = s->avctx;
put_vc2_ue_uint(&s->pb, avctx->width);
put_vc2_ue_uint(&s->pb, avctx->height);
}
}
/* VC-2 11.3.3 - color_diff_sampling_format() */
static void encode_sample_fmt(VC2EncContext *s)
{
put_bits(&s->pb, 1, !s->strict_compliance);
if (!s->strict_compliance) {
int idx;
if (s->chroma_x_shift == 1 && s->chroma_y_shift == 0)
idx = 1; /* 422 */
else if (s->chroma_x_shift == 1 && s->chroma_y_shift == 1)
idx = 2; /* 420 */
else
idx = 0; /* 444 */
put_vc2_ue_uint(&s->pb, idx);
}
}
/* VC-2 11.3.4 - scan_format() */
static void encode_scan_format(VC2EncContext *s)
{
put_bits(&s->pb, 1, !s->strict_compliance);
if (!s->strict_compliance)
put_vc2_ue_uint(&s->pb, s->interlaced);
}
/* VC-2 11.3.5 - frame_rate() */
static void encode_frame_rate(VC2EncContext *s)
{
put_bits(&s->pb, 1, !s->strict_compliance);
if (!s->strict_compliance) {
AVCodecContext *avctx = s->avctx;
put_vc2_ue_uint(&s->pb, 0);
put_vc2_ue_uint(&s->pb, avctx->time_base.den);
put_vc2_ue_uint(&s->pb, avctx->time_base.num);
}
}
/* VC-2 11.3.6 - aspect_ratio() */
static void encode_aspect_ratio(VC2EncContext *s)
{
put_bits(&s->pb, 1, !s->strict_compliance);
if (!s->strict_compliance) {
AVCodecContext *avctx = s->avctx;
put_vc2_ue_uint(&s->pb, 0);
put_vc2_ue_uint(&s->pb, avctx->sample_aspect_ratio.num);
put_vc2_ue_uint(&s->pb, avctx->sample_aspect_ratio.den);
}
}
/* VC-2 11.3.7 - clean_area() */
static void encode_clean_area(VC2EncContext *s)
{
put_bits(&s->pb, 1, 0);
}
/* VC-2 11.3.8 - signal_range() */
static void encode_signal_range(VC2EncContext *s)
{
put_bits(&s->pb, 1, !s->strict_compliance);
if (!s->strict_compliance)
put_vc2_ue_uint(&s->pb, s->bpp_idx);
}
/* VC-2 11.3.9 - color_spec() */
static void encode_color_spec(VC2EncContext *s)
{
AVCodecContext *avctx = s->avctx;
put_bits(&s->pb, 1, !s->strict_compliance);
if (!s->strict_compliance) {
int val;
put_vc2_ue_uint(&s->pb, 0);
/* primaries */
put_bits(&s->pb, 1, 1);
if (avctx->color_primaries == AVCOL_PRI_BT470BG)
val = 2;
else if (avctx->color_primaries == AVCOL_PRI_SMPTE170M)
val = 1;
else if (avctx->color_primaries == AVCOL_PRI_SMPTE240M)
val = 1;
else
val = 0;
put_vc2_ue_uint(&s->pb, val);
/* color matrix */
put_bits(&s->pb, 1, 1);
if (avctx->colorspace == AVCOL_SPC_RGB)
val = 3;
else if (avctx->colorspace == AVCOL_SPC_YCOCG)
val = 2;
else if (avctx->colorspace == AVCOL_SPC_BT470BG)
val = 1;
else
val = 0;
put_vc2_ue_uint(&s->pb, val);
/* transfer function */
put_bits(&s->pb, 1, 1);
if (avctx->color_trc == AVCOL_TRC_LINEAR)
val = 2;
else if (avctx->color_trc == AVCOL_TRC_BT1361_ECG)
val = 1;
else
val = 0;
put_vc2_ue_uint(&s->pb, val);
}
}
/* VC-2 11.3 - source_parameters() */
static void encode_source_params(VC2EncContext *s)
{
encode_frame_size(s);
encode_sample_fmt(s);
encode_scan_format(s);
encode_frame_rate(s);
encode_aspect_ratio(s);
encode_clean_area(s);
encode_signal_range(s);
encode_color_spec(s);
}
/* VC-2 11 - sequence_header() */
static void encode_seq_header(VC2EncContext *s)
{
align_put_bits(&s->pb);
encode_parse_params(s);
put_vc2_ue_uint(&s->pb, s->base_vf);
encode_source_params(s);
put_vc2_ue_uint(&s->pb, s->interlaced); /* Frames or fields coding */
}
/* VC-2 12.1 - picture_header() */
static void encode_picture_header(VC2EncContext *s)
{
align_put_bits(&s->pb);
put_bits32(&s->pb, s->picture_number++);
}
/* VC-2 12.3.4.1 - slice_parameters() */
static void encode_slice_params(VC2EncContext *s)
{
put_vc2_ue_uint(&s->pb, s->num_x);
put_vc2_ue_uint(&s->pb, s->num_y);
put_vc2_ue_uint(&s->pb, s->prefix_bytes);
put_vc2_ue_uint(&s->pb, s->size_scaler);
}
/* 1st idx = LL, second - vertical, third - horizontal, fourth - total */
static const uint8_t vc2_qm_col_tab[][4] = {
{20, 9, 15, 4},
{ 0, 6, 6, 4},
{ 0, 3, 3, 5},
{ 0, 3, 5, 1},
{ 0, 11, 10, 11}
};
static const uint8_t vc2_qm_flat_tab[][4] = {
{ 0, 0, 0, 0},
{ 0, 0, 0, 0},
{ 0, 0, 0, 0},
{ 0, 0, 0, 0},
{ 0, 0, 0, 0}
};
static void init_quant_matrix(VC2EncContext *s)
{
int level, orientation;
if (s->wavelet_depth <= 4 && s->quant_matrix == VC2_QM_DEF) {
s->custom_quant_matrix = 0;
for (level = 0; level < s->wavelet_depth; level++) {
s->quant[level][0] = ff_dirac_default_qmat[s->wavelet_idx][level][0];
s->quant[level][1] = ff_dirac_default_qmat[s->wavelet_idx][level][1];
s->quant[level][2] = ff_dirac_default_qmat[s->wavelet_idx][level][2];
s->quant[level][3] = ff_dirac_default_qmat[s->wavelet_idx][level][3];
}
return;
}
s->custom_quant_matrix = 1;
if (s->quant_matrix == VC2_QM_DEF) {
for (level = 0; level < s->wavelet_depth; level++) {
for (orientation = 0; orientation < 4; orientation++) {
if (level <= 3)
s->quant[level][orientation] = ff_dirac_default_qmat[s->wavelet_idx][level][orientation];
else
s->quant[level][orientation] = vc2_qm_col_tab[level][orientation];
}
}
} else if (s->quant_matrix == VC2_QM_COL) {
for (level = 0; level < s->wavelet_depth; level++) {
for (orientation = 0; orientation < 4; orientation++) {
s->quant[level][orientation] = vc2_qm_col_tab[level][orientation];
}
}
} else {
for (level = 0; level < s->wavelet_depth; level++) {
for (orientation = 0; orientation < 4; orientation++) {
s->quant[level][orientation] = vc2_qm_flat_tab[level][orientation];
}
}
}
}
/* VC-2 12.3.4.2 - quant_matrix() */
static void encode_quant_matrix(VC2EncContext *s)
{
int level;
put_bits(&s->pb, 1, s->custom_quant_matrix);
if (s->custom_quant_matrix) {
put_vc2_ue_uint(&s->pb, s->quant[0][0]);
for (level = 0; level < s->wavelet_depth; level++) {
put_vc2_ue_uint(&s->pb, s->quant[level][1]);
put_vc2_ue_uint(&s->pb, s->quant[level][2]);
put_vc2_ue_uint(&s->pb, s->quant[level][3]);
}
}
}
/* VC-2 12.3 - transform_parameters() */
static void encode_transform_params(VC2EncContext *s)
{
put_vc2_ue_uint(&s->pb, s->wavelet_idx);
put_vc2_ue_uint(&s->pb, s->wavelet_depth);
encode_slice_params(s);
encode_quant_matrix(s);
}
/* VC-2 12.2 - wavelet_transform() */
static void encode_wavelet_transform(VC2EncContext *s)
{
encode_transform_params(s);
align_put_bits(&s->pb);
}
/* VC-2 12 - picture_parse() */
static void encode_picture_start(VC2EncContext *s)
{
align_put_bits(&s->pb);
encode_picture_header(s);
align_put_bits(&s->pb);
encode_wavelet_transform(s);
}
#define QUANT(c, mul, add, shift) (((mul) * (c) + (add)) >> (shift))
/* VC-2 13.5.5.2 - slice_band() */
static void encode_subband(VC2EncContext *s, PutBitContext *pb, int sx, int sy,
SubBand *b, int quant)
{
int x, y;
const int left = b->width * (sx+0) / s->num_x;
const int right = b->width * (sx+1) / s->num_x;
const int top = b->height * (sy+0) / s->num_y;
const int bottom = b->height * (sy+1) / s->num_y;
dwtcoef *coeff = b->buf + top * b->stride;
const uint64_t q_m = ((uint64_t)(s->qmagic_lut[quant][0])) << 2;
const uint64_t q_a = s->qmagic_lut[quant][1];
const int q_s = av_log2(ff_dirac_qscale_tab[quant]) + 32;
for (y = top; y < bottom; y++) {
for (x = left; x < right; x++) {
uint32_t c_abs = QUANT(FFABS(coeff[x]), q_m, q_a, q_s);
put_vc2_ue_uint(pb, c_abs);
if (c_abs)
put_bits(pb, 1, coeff[x] < 0);
}
coeff += b->stride;
}
}
static int count_hq_slice(SliceArgs *slice, int quant_idx)
{
int x, y;
uint8_t quants[MAX_DWT_LEVELS][4];
int bits = 0, p, level, orientation;
VC2EncContext *s = slice->ctx;
if (slice->cache[quant_idx])
return slice->cache[quant_idx];
bits += 8*s->prefix_bytes;
bits += 8; /* quant_idx */
for (level = 0; level < s->wavelet_depth; level++)
for (orientation = !!level; orientation < 4; orientation++)
quants[level][orientation] = FFMAX(quant_idx - s->quant[level][orientation], 0);
for (p = 0; p < 3; p++) {
int bytes_start, bytes_len, pad_s, pad_c;
bytes_start = bits >> 3;
bits += 8;
for (level = 0; level < s->wavelet_depth; level++) {
for (orientation = !!level; orientation < 4; orientation++) {
SubBand *b = &s->plane[p].band[level][orientation];
const int q_idx = quants[level][orientation];
const uint64_t q_m = ((uint64_t)s->qmagic_lut[q_idx][0]) << 2;
const uint64_t q_a = s->qmagic_lut[q_idx][1];
const int q_s = av_log2(ff_dirac_qscale_tab[q_idx]) + 32;
const int left = b->width * slice->x / s->num_x;
const int right = b->width *(slice->x+1) / s->num_x;
const int top = b->height * slice->y / s->num_y;
const int bottom = b->height *(slice->y+1) / s->num_y;
dwtcoef *buf = b->buf + top * b->stride;
for (y = top; y < bottom; y++) {
for (x = left; x < right; x++) {
uint32_t c_abs = QUANT(FFABS(buf[x]), q_m, q_a, q_s);
bits += count_vc2_ue_uint(c_abs);
bits += !!c_abs;
}
buf += b->stride;
}
}
}
bits += FFALIGN(bits, 8) - bits;
bytes_len = (bits >> 3) - bytes_start - 1;
pad_s = FFALIGN(bytes_len, s->size_scaler)/s->size_scaler;
pad_c = (pad_s*s->size_scaler) - bytes_len;
bits += pad_c*8;
}
slice->cache[quant_idx] = bits;
return bits;
}
/* Approaches the best possible quantizer asymptotically, its kinda exaustive
* but we have a LUT to get the coefficient size in bits. Guaranteed to never
* overshoot, which is apparently very important when streaming */
static int rate_control(AVCodecContext *avctx, void *arg)
{
SliceArgs *slice_dat = arg;
VC2EncContext *s = slice_dat->ctx;
const int top = slice_dat->bits_ceil;
const int bottom = slice_dat->bits_floor;
int quant_buf[2] = {-1, -1};
int quant = slice_dat->quant_idx, step = 1;
int bits_last, bits = count_hq_slice(slice_dat, quant);
while ((bits > top) || (bits < bottom)) {
const int signed_step = bits > top ? +step : -step;
quant = av_clip(quant + signed_step, 0, s->q_ceil-1);
bits = count_hq_slice(slice_dat, quant);
if (quant_buf[1] == quant) {
quant = FFMAX(quant_buf[0], quant);
bits = quant == quant_buf[0] ? bits_last : bits;
break;
}
step = av_clip(step/2, 1, (s->q_ceil-1)/2);
quant_buf[1] = quant_buf[0];
quant_buf[0] = quant;
bits_last = bits;
}
slice_dat->quant_idx = av_clip(quant, 0, s->q_ceil-1);
slice_dat->bytes = SSIZE_ROUND(bits >> 3);
return 0;
}
static int calc_slice_sizes(VC2EncContext *s)
{
int i, j, slice_x, slice_y, bytes_left = 0;
int bytes_top[SLICE_REDIST_TOTAL] = {0};
int64_t total_bytes_needed = 0;
int slice_redist_range = FFMIN(SLICE_REDIST_TOTAL, s->num_x*s->num_y);
SliceArgs *enc_args = s->slice_args;
SliceArgs *top_loc[SLICE_REDIST_TOTAL] = {NULL};
init_quant_matrix(s);
for (slice_y = 0; slice_y < s->num_y; slice_y++) {
for (slice_x = 0; slice_x < s->num_x; slice_x++) {
SliceArgs *args = &enc_args[s->num_x*slice_y + slice_x];
args->ctx = s;
args->x = slice_x;
args->y = slice_y;
args->bits_ceil = s->slice_max_bytes << 3;
args->bits_floor = s->slice_min_bytes << 3;
memset(args->cache, 0, s->q_ceil*sizeof(*args->cache));
}
}
/* First pass - determine baseline slice sizes w.r.t. max_slice_size */
s->avctx->execute(s->avctx, rate_control, enc_args, NULL, s->num_x*s->num_y,
sizeof(SliceArgs));
for (i = 0; i < s->num_x*s->num_y; i++) {
SliceArgs *args = &enc_args[i];
bytes_left += args->bytes;
for (j = 0; j < slice_redist_range; j++) {
if (args->bytes > bytes_top[j]) {
bytes_top[j] = args->bytes;
top_loc[j] = args;
break;
}
}
}
bytes_left = s->frame_max_bytes - bytes_left;
/* Second pass - distribute leftover bytes */
while (bytes_left > 0) {
int distributed = 0;
for (i = 0; i < slice_redist_range; i++) {
SliceArgs *args;
int bits, bytes, diff, prev_bytes, new_idx;
if (bytes_left <= 0)
break;
if (!top_loc[i] || !top_loc[i]->quant_idx)
break;
args = top_loc[i];
prev_bytes = args->bytes;
new_idx = FFMAX(args->quant_idx - 1, 0);
bits = count_hq_slice(args, new_idx);
bytes = SSIZE_ROUND(bits >> 3);
diff = bytes - prev_bytes;
if ((bytes_left - diff) > 0) {
args->quant_idx = new_idx;
args->bytes = bytes;
bytes_left -= diff;
distributed++;
}
}
if (!distributed)
break;
}
for (i = 0; i < s->num_x*s->num_y; i++) {
SliceArgs *args = &enc_args[i];
total_bytes_needed += args->bytes;
s->q_avg = (s->q_avg + args->quant_idx)/2;
}
return total_bytes_needed;
}
/* VC-2 13.5.3 - hq_slice */
static int encode_hq_slice(AVCodecContext *avctx, void *arg)
{
SliceArgs *slice_dat = arg;
VC2EncContext *s = slice_dat->ctx;
PutBitContext *pb = &slice_dat->pb;
const int slice_x = slice_dat->x;
const int slice_y = slice_dat->y;
const int quant_idx = slice_dat->quant_idx;
const int slice_bytes_max = slice_dat->bytes;
uint8_t quants[MAX_DWT_LEVELS][4];
int p, level, orientation;
/* The reference decoder ignores it, and its typical length is 0 */
memset(put_bits_ptr(pb), 0, s->prefix_bytes);
skip_put_bytes(pb, s->prefix_bytes);
put_bits(pb, 8, quant_idx);
/* Slice quantization (slice_quantizers() in the specs) */
for (level = 0; level < s->wavelet_depth; level++)
for (orientation = !!level; orientation < 4; orientation++)
quants[level][orientation] = FFMAX(quant_idx - s->quant[level][orientation], 0);
/* Luma + 2 Chroma planes */
for (p = 0; p < 3; p++) {
int bytes_start, bytes_len, pad_s, pad_c;
bytes_start = put_bytes_count(pb, 0);
put_bits(pb, 8, 0);
for (level = 0; level < s->wavelet_depth; level++) {
for (orientation = !!level; orientation < 4; orientation++) {
encode_subband(s, pb, slice_x, slice_y,
&s->plane[p].band[level][orientation],
quants[level][orientation]);
}
}
flush_put_bits(pb);
bytes_len = put_bytes_output(pb) - bytes_start - 1;
if (p == 2) {
int len_diff = slice_bytes_max - put_bytes_output(pb);
pad_s = FFALIGN((bytes_len + len_diff), s->size_scaler)/s->size_scaler;
pad_c = (pad_s*s->size_scaler) - bytes_len;
} else {
pad_s = FFALIGN(bytes_len, s->size_scaler)/s->size_scaler;
pad_c = (pad_s*s->size_scaler) - bytes_len;
}
pb->buf[bytes_start] = pad_s;
/* vc2-reference uses that padding that decodes to '0' coeffs */
memset(put_bits_ptr(pb), 0xFF, pad_c);
skip_put_bytes(pb, pad_c);
}
return 0;
}
/* VC-2 13.5.1 - low_delay_transform_data() */
static int encode_slices(VC2EncContext *s)
{
uint8_t *buf;
int slice_x, slice_y, skip = 0;
SliceArgs *enc_args = s->slice_args;
flush_put_bits(&s->pb);
buf = put_bits_ptr(&s->pb);
for (slice_y = 0; slice_y < s->num_y; slice_y++) {
for (slice_x = 0; slice_x < s->num_x; slice_x++) {
SliceArgs *args = &enc_args[s->num_x*slice_y + slice_x];
init_put_bits(&args->pb, buf + skip, args->bytes+s->prefix_bytes);
skip += args->bytes;
}
}
s->avctx->execute(s->avctx, encode_hq_slice, enc_args, NULL, s->num_x*s->num_y,
sizeof(SliceArgs));
skip_put_bytes(&s->pb, skip);
return 0;
}
/*
* Transform basics for a 3 level transform
* |---------------------------------------------------------------------|
* | LL-0 | HL-0 | | |
* |--------|-------| HL-1 | |
* | LH-0 | HH-0 | | |
* |----------------|-----------------| HL-2 |
* | | | |
* | LH-1 | HH-1 | |
* | | | |
* |----------------------------------|----------------------------------|
* | | |
* | | |
* | | |
* | LH-2 | HH-2 |
* | | |
* | | |
* | | |
* |---------------------------------------------------------------------|
*
* DWT transforms are generally applied by splitting the image in two vertically
* and applying a low pass transform on the left part and a corresponding high
* pass transform on the right hand side. This is known as the horizontal filter
* stage.
* After that, the same operation is performed except the image is divided
* horizontally, with the high pass on the lower and the low pass on the higher
* side.
* Therefore, you're left with 4 subdivisions - known as low-low, low-high,
* high-low and high-high. They're referred to as orientations in the decoder
* and encoder.
*
* The LL (low-low) area contains the original image downsampled by the amount
* of levels. The rest of the areas can be thought as the details needed
* to restore the image perfectly to its original size.
*/
static int dwt_plane(AVCodecContext *avctx, void *arg)
{
TransformArgs *transform_dat = arg;
VC2EncContext *s = transform_dat->ctx;
const void *frame_data = transform_dat->idata;
const ptrdiff_t linesize = transform_dat->istride;
const int field = transform_dat->field;
const Plane *p = transform_dat->plane;
VC2TransformContext *t = &transform_dat->t;
dwtcoef *buf = p->coef_buf;
const int idx = s->wavelet_idx;
const int skip = 1 + s->interlaced;
int x, y, level, offset;
ptrdiff_t pix_stride = linesize >> (s->bpp - 1);
if (field == 1) {
offset = 0;
pix_stride <<= 1;
} else if (field == 2) {
offset = pix_stride;
pix_stride <<= 1;
} else {
offset = 0;
}
if (s->bpp == 1) {
const uint8_t *pix = (const uint8_t *)frame_data + offset;
for (y = 0; y < p->height*skip; y+=skip) {
for (x = 0; x < p->width; x++) {
buf[x] = pix[x] - s->diff_offset;
}
memset(&buf[x], 0, (p->coef_stride - p->width)*sizeof(dwtcoef));
buf += p->coef_stride;
pix += pix_stride;
}
} else {
const uint16_t *pix = (const uint16_t *)frame_data + offset;
for (y = 0; y < p->height*skip; y+=skip) {
for (x = 0; x < p->width; x++) {
buf[x] = pix[x] - s->diff_offset;
}
memset(&buf[x], 0, (p->coef_stride - p->width)*sizeof(dwtcoef));
buf += p->coef_stride;
pix += pix_stride;
}
}
memset(buf, 0, p->coef_stride * (p->dwt_height - p->height) * sizeof(dwtcoef));
for (level = s->wavelet_depth-1; level >= 0; level--) {
const SubBand *b = &p->band[level][0];
t->vc2_subband_dwt[idx](t, p->coef_buf, p->coef_stride,
b->width, b->height);
}
return 0;
}
static int encode_frame(VC2EncContext *s, AVPacket *avpkt, const AVFrame *frame,
const char *aux_data, const int header_size, int field)
{
int i, ret;
int64_t max_frame_bytes;
/* Threaded DWT transform */
for (i = 0; i < 3; i++) {
s->transform_args[i].ctx = s;
s->transform_args[i].field = field;
s->transform_args[i].plane = &s->plane[i];
s->transform_args[i].idata = frame->data[i];
s->transform_args[i].istride = frame->linesize[i];
}
s->avctx->execute(s->avctx, dwt_plane, s->transform_args, NULL, 3,
sizeof(TransformArgs));
/* Calculate per-slice quantizers and sizes */
max_frame_bytes = header_size + calc_slice_sizes(s);
if (field < 2) {
ret = ff_get_encode_buffer(s->avctx, avpkt,
max_frame_bytes << s->interlaced, 0);
if (ret) {
av_log(s->avctx, AV_LOG_ERROR, "Error getting output packet.\n");
return ret;
}
init_put_bits(&s->pb, avpkt->data, avpkt->size);
}
/* Sequence header */
encode_parse_info(s, DIRAC_PCODE_SEQ_HEADER);
encode_seq_header(s);
/* Encoder version */
if (aux_data) {
encode_parse_info(s, DIRAC_PCODE_AUX);
ff_put_string(&s->pb, aux_data, 1);
}
/* Picture header */
encode_parse_info(s, DIRAC_PCODE_PICTURE_HQ);
encode_picture_start(s);
/* Encode slices */
encode_slices(s);
/* End sequence */
encode_parse_info(s, DIRAC_PCODE_END_SEQ);
return 0;
}
static av_cold int vc2_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
const AVFrame *frame, int *got_packet)
{
int ret = 0;
int slice_ceil, sig_size = 256;
VC2EncContext *s = avctx->priv_data;
const int bitexact = avctx->flags & AV_CODEC_FLAG_BITEXACT;
const char *aux_data = bitexact ? "Lavc" : LIBAVCODEC_IDENT;
const int aux_data_size = bitexact ? sizeof("Lavc") : sizeof(LIBAVCODEC_IDENT);
const int header_size = 100 + aux_data_size;
int64_t r_bitrate = avctx->bit_rate >> (s->interlaced);
s->avctx = avctx;
s->size_scaler = 2;
s->prefix_bytes = 0;
s->last_parse_code = 0;
s->next_parse_offset = 0;
/* Rate control */
s->frame_max_bytes = (av_rescale(r_bitrate, s->avctx->time_base.num,
s->avctx->time_base.den) >> 3) - header_size;
s->slice_max_bytes = slice_ceil = av_rescale(s->frame_max_bytes, 1, s->num_x*s->num_y);
/* Find an appropriate size scaler */
while (sig_size > 255) {
int r_size = SSIZE_ROUND(s->slice_max_bytes);
if (r_size > slice_ceil) {
s->slice_max_bytes -= r_size - slice_ceil;
r_size = SSIZE_ROUND(s->slice_max_bytes);
}
sig_size = r_size/s->size_scaler; /* Signalled slize size */
s->size_scaler <<= 1;
}
s->slice_min_bytes = s->slice_max_bytes - s->slice_max_bytes*(s->tolerance/100.0f);
if (s->slice_min_bytes < 0)
return AVERROR(EINVAL);
ret = encode_frame(s, avpkt, frame, aux_data, header_size, s->interlaced);
if (ret)
return ret;
if (s->interlaced) {
ret = encode_frame(s, avpkt, frame, aux_data, header_size, 2);
if (ret)
return ret;
}
flush_put_bits(&s->pb);
av_shrink_packet(avpkt, put_bytes_output(&s->pb));
*got_packet = 1;
return 0;
}
static av_cold int vc2_encode_end(AVCodecContext *avctx)
{
int i;
VC2EncContext *s = avctx->priv_data;
av_log(avctx, AV_LOG_INFO, "Qavg: %i\n", s->q_avg);
for (i = 0; i < 3; i++) {
ff_vc2enc_free_transforms(&s->transform_args[i].t);
av_freep(&s->plane[i].coef_buf);
}
av_freep(&s->slice_args);
return 0;
}
static av_cold int vc2_encode_init(AVCodecContext *avctx)
{
Plane *p;
SubBand *b;
int i, level, o, shift, ret;
const AVPixFmtDescriptor *fmt = av_pix_fmt_desc_get(avctx->pix_fmt);
const int depth = fmt->comp[0].depth;
VC2EncContext *s = avctx->priv_data;
s->picture_number = 0;
/* Total allowed quantization range */
s->q_ceil = DIRAC_MAX_QUANT_INDEX;
s->ver.major = 2;
s->ver.minor = 0;
s->profile = 3;
s->level = 3;
s->base_vf = -1;
s->strict_compliance = 1;
s->q_avg = 0;
s->slice_max_bytes = 0;
s->slice_min_bytes = 0;
/* Mark unknown as progressive */
s->interlaced = !((avctx->field_order == AV_FIELD_UNKNOWN) ||
(avctx->field_order == AV_FIELD_PROGRESSIVE));
for (i = 0; i < base_video_fmts_len; i++) {
const VC2BaseVideoFormat *fmt = &base_video_fmts[i];
if (avctx->pix_fmt != fmt->pix_fmt)
continue;
if (avctx->time_base.num != fmt->time_base.num)
continue;
if (avctx->time_base.den != fmt->time_base.den)
continue;
if (avctx->width != fmt->width)
continue;
if (avctx->height != fmt->height)
continue;
if (s->interlaced != fmt->interlaced)
continue;
s->base_vf = i;
s->level = base_video_fmts[i].level;
break;
}
if (s->interlaced)
av_log(avctx, AV_LOG_WARNING, "Interlacing enabled!\n");
if ((s->slice_width & (s->slice_width - 1)) ||
(s->slice_height & (s->slice_height - 1))) {
av_log(avctx, AV_LOG_ERROR, "Slice size is not a power of two!\n");
return AVERROR_UNKNOWN;
}
if ((s->slice_width > avctx->width) ||
(s->slice_height > avctx->height)) {
av_log(avctx, AV_LOG_ERROR, "Slice size is bigger than the image!\n");
return AVERROR_UNKNOWN;
}
if (s->base_vf <= 0) {
if (avctx->strict_std_compliance < FF_COMPLIANCE_STRICT) {
s->strict_compliance = s->base_vf = 0;
av_log(avctx, AV_LOG_WARNING, "Format does not strictly comply with VC2 specs\n");
} else {
av_log(avctx, AV_LOG_WARNING, "Given format does not strictly comply with "
"the specifications, decrease strictness to use it.\n");
return AVERROR_UNKNOWN;
}
} else {
av_log(avctx, AV_LOG_INFO, "Selected base video format = %i (%s)\n",
s->base_vf, base_video_fmts[s->base_vf].name);
}
/* Chroma subsampling */
ret = av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &s->chroma_x_shift, &s->chroma_y_shift);
if (ret)
return ret;
/* Bit depth and color range index */
if (depth == 8 && avctx->color_range == AVCOL_RANGE_JPEG) {
s->bpp = 1;
s->bpp_idx = 1;
s->diff_offset = 128;
} else if (depth == 8 && (avctx->color_range == AVCOL_RANGE_MPEG ||
avctx->color_range == AVCOL_RANGE_UNSPECIFIED)) {
s->bpp = 1;
s->bpp_idx = 2;
s->diff_offset = 128;
} else if (depth == 10) {
s->bpp = 2;
s->bpp_idx = 3;
s->diff_offset = 512;
} else {
s->bpp = 2;
s->bpp_idx = 4;
s->diff_offset = 2048;
}
/* Planes initialization */
for (i = 0; i < 3; i++) {
int w, h;
p = &s->plane[i];
p->width = avctx->width >> (i ? s->chroma_x_shift : 0);
p->height = avctx->height >> (i ? s->chroma_y_shift : 0);
if (s->interlaced)
p->height >>= 1;
p->dwt_width = w = FFALIGN(p->width, (1 << s->wavelet_depth));
p->dwt_height = h = FFALIGN(p->height, (1 << s->wavelet_depth));
p->coef_stride = FFALIGN(p->dwt_width, 32);
p->coef_buf = av_mallocz(p->coef_stride*p->dwt_height*sizeof(dwtcoef));
if (!p->coef_buf)
return AVERROR(ENOMEM);
for (level = s->wavelet_depth-1; level >= 0; level--) {
w = w >> 1;
h = h >> 1;
for (o = 0; o < 4; o++) {
b = &p->band[level][o];
b->width = w;
b->height = h;
b->stride = p->coef_stride;
shift = (o > 1)*b->height*b->stride + (o & 1)*b->width;
b->buf = p->coef_buf + shift;
}
}
/* DWT init */
if (ff_vc2enc_init_transforms(&s->transform_args[i].t,
s->plane[i].coef_stride,
s->plane[i].dwt_height,
s->slice_width, s->slice_height))
return AVERROR(ENOMEM);
}
/* Slices */
s->num_x = s->plane[0].dwt_width/s->slice_width;
s->num_y = s->plane[0].dwt_height/s->slice_height;
s->slice_args = av_calloc(s->num_x*s->num_y, sizeof(SliceArgs));
if (!s->slice_args)
return AVERROR(ENOMEM);
for (i = 0; i < 116; i++) {
const uint64_t qf = ff_dirac_qscale_tab[i];
const uint32_t m = av_log2(qf);
const uint32_t t = (1ULL << (m + 32)) / qf;
const uint32_t r = (t*qf + qf) & UINT32_MAX;
if (!(qf & (qf - 1))) {
s->qmagic_lut[i][0] = 0xFFFFFFFF;
s->qmagic_lut[i][1] = 0xFFFFFFFF;
} else if (r <= 1 << m) {
s->qmagic_lut[i][0] = t + 1;
s->qmagic_lut[i][1] = 0;
} else {
s->qmagic_lut[i][0] = t;
s->qmagic_lut[i][1] = t;
}
}
return 0;
}
#define VC2ENC_FLAGS (AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
static const AVOption vc2enc_options[] = {
{"tolerance", "Max undershoot in percent", offsetof(VC2EncContext, tolerance), AV_OPT_TYPE_DOUBLE, {.dbl = 5.0f}, 0.0f, 45.0f, VC2ENC_FLAGS, "tolerance"},
{"slice_width", "Slice width", offsetof(VC2EncContext, slice_width), AV_OPT_TYPE_INT, {.i64 = 32}, 32, 1024, VC2ENC_FLAGS, "slice_width"},
{"slice_height", "Slice height", offsetof(VC2EncContext, slice_height), AV_OPT_TYPE_INT, {.i64 = 16}, 8, 1024, VC2ENC_FLAGS, "slice_height"},
{"wavelet_depth", "Transform depth", offsetof(VC2EncContext, wavelet_depth), AV_OPT_TYPE_INT, {.i64 = 4}, 1, 5, VC2ENC_FLAGS, "wavelet_depth"},
{"wavelet_type", "Transform type", offsetof(VC2EncContext, wavelet_idx), AV_OPT_TYPE_INT, {.i64 = VC2_TRANSFORM_9_7}, 0, VC2_TRANSFORMS_NB, VC2ENC_FLAGS, "wavelet_idx"},
{"9_7", "Deslauriers-Dubuc (9,7)", 0, AV_OPT_TYPE_CONST, {.i64 = VC2_TRANSFORM_9_7}, INT_MIN, INT_MAX, VC2ENC_FLAGS, "wavelet_idx"},
{"5_3", "LeGall (5,3)", 0, AV_OPT_TYPE_CONST, {.i64 = VC2_TRANSFORM_5_3}, INT_MIN, INT_MAX, VC2ENC_FLAGS, "wavelet_idx"},
{"haar", "Haar (with shift)", 0, AV_OPT_TYPE_CONST, {.i64 = VC2_TRANSFORM_HAAR_S}, INT_MIN, INT_MAX, VC2ENC_FLAGS, "wavelet_idx"},
{"haar_noshift", "Haar (without shift)", 0, AV_OPT_TYPE_CONST, {.i64 = VC2_TRANSFORM_HAAR}, INT_MIN, INT_MAX, VC2ENC_FLAGS, "wavelet_idx"},
{"qm", "Custom quantization matrix", offsetof(VC2EncContext, quant_matrix), AV_OPT_TYPE_INT, {.i64 = VC2_QM_DEF}, 0, VC2_QM_NB, VC2ENC_FLAGS, "quant_matrix"},
{"default", "Default from the specifications", 0, AV_OPT_TYPE_CONST, {.i64 = VC2_QM_DEF}, INT_MIN, INT_MAX, VC2ENC_FLAGS, "quant_matrix"},
{"color", "Prevents low bitrate discoloration", 0, AV_OPT_TYPE_CONST, {.i64 = VC2_QM_COL}, INT_MIN, INT_MAX, VC2ENC_FLAGS, "quant_matrix"},
{"flat", "Optimize for PSNR", 0, AV_OPT_TYPE_CONST, {.i64 = VC2_QM_FLAT}, INT_MIN, INT_MAX, VC2ENC_FLAGS, "quant_matrix"},
{NULL}
};
static const AVClass vc2enc_class = {
.class_name = "SMPTE VC-2 encoder",
.category = AV_CLASS_CATEGORY_ENCODER,
.option = vc2enc_options,
.item_name = av_default_item_name,
.version = LIBAVUTIL_VERSION_INT
};
static const FFCodecDefault vc2enc_defaults[] = {
{ "b", "600000000" },
{ NULL },
};
static const enum AVPixelFormat allowed_pix_fmts[] = {
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P,
AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12,
AV_PIX_FMT_NONE
};
const FFCodec ff_vc2_encoder = {
.p.name = "vc2",
CODEC_LONG_NAME("SMPTE VC-2"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_DIRAC,
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
.priv_data_size = sizeof(VC2EncContext),
.init = vc2_encode_init,
.close = vc2_encode_end,
FF_CODEC_ENCODE_CB(vc2_encode_frame),
.p.priv_class = &vc2enc_class,
.defaults = vc2enc_defaults,
.p.pix_fmts = allowed_pix_fmts
};
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