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FFmpeg/libavcodec/vc2enc.c
Rostislav Pehlivanov 3b1d1437a0 vc2enc: print the average quantization index at the end 
Similar to how the AAC encoder does it.
0 means the video's been compressed losslessly/almost losslessly
thoughout. Generally, the higher, the worse.

Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
2016-02-15 23:54:52 +00:00

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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/ffversion.h"
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "dirac.h"
#include "put_bits.h"
#include "internal.h"
#include "vc2enc_dwt.h"
#include "diractab.h"
/* Quantizations above this usually zero coefficients and lower the quality */
#define MAX_QUANT_INDEX 100
#define COEF_LUT_TAB 2048
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;
void *ctx;
int x;
int y;
int quant_idx;
int bits_ceil;
int bytes;
} SliceArgs;
typedef struct TransformArgs {
void *ctx;
Plane *plane;
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;
/* 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];
/* Coefficient LUT */
uint32_t *coef_lut_val;
uint8_t *coef_lut_len;
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 slice_max_bytes;
int q_ceil;
int q_start;
/* 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_padding(PutBitContext *pb, int bytes)
{
int bits = bytes*8;
if (!bits)
return;
while (bits > 31) {
put_bits(pb, 31, 0);
bits -= 31;
}
if (bits)
put_bits(pb, bits, 0);
}
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(uint16_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;
}
static av_always_inline void get_vc2_ue_uint(uint16_t val, uint8_t *nbits,
uint32_t *eval)
{
int i;
int pbits = 0, bits = 0, topbit = 1, maxval = 1;
if (!val++) {
*nbits = 1;
*eval = 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;
}
*nbits = bits*2 + 1;
*eval = (pbits << 1) | 1;
}
/* VC-2 10.4 - parse_info() */
static void encode_parse_info(VC2EncContext *s, enum DiracParseCodes pcode)
{
uint32_t cur_pos, dist;
avpriv_align_put_bits(&s->pb);
cur_pos = put_bits_count(&s->pb) >> 3;
/* Magic string */
avpriv_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)
{
int idx;
AVCodecContext *avctx = s->avctx;
const AVPixFmtDescriptor *fmt = av_pix_fmt_desc_get(avctx->pix_fmt);
const int depth = fmt->comp[0].depth;
if (depth == 8 && avctx->color_range == AVCOL_RANGE_JPEG) {
idx = 1;
s->bpp = 1;
s->diff_offset = 128;
} else if (depth == 8 && (avctx->color_range == AVCOL_RANGE_MPEG ||
avctx->color_range == AVCOL_RANGE_UNSPECIFIED)) {
idx = 2;
s->bpp = 1;
s->diff_offset = 128;
} else if (depth == 10) {
idx = 3;
s->bpp = 2;
s->diff_offset = 512;
} else {
idx = 4;
s->bpp = 2;
s->diff_offset = 2048;
}
put_bits(&s->pb, 1, !s->strict_compliance);
if (!s->strict_compliance)
put_vc2_ue_uint(&s->pb, 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)
{
avpriv_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)
{
avpriv_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 */
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}
};
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_custom_qm(VC2EncContext *s)
{
int level, orientation;
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, custom_quant_matrix = 0;
if (s->wavelet_depth > 4 || s->quant_matrix != VC2_QM_DEF)
custom_quant_matrix = 1;
put_bits(&s->pb, 1, custom_quant_matrix);
if (custom_quant_matrix) {
init_custom_qm(s);
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]);
}
} else {
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];
}
}
}
/* 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);
avpriv_align_put_bits(&s->pb);
/* Continued after DWT in encode_transform_data() */
}
/* VC-2 12 - picture_parse() */
static void encode_picture_start(VC2EncContext *s)
{
avpriv_align_put_bits(&s->pb);
encode_picture_header(s);
avpriv_align_put_bits(&s->pb);
encode_wavelet_transform(s);
}
#define QUANT(c) \
c <<= 2; \
c /= qfactor; \
static av_always_inline void coeff_quantize_get(qcoef coeff, int qfactor,
uint8_t *len, uint32_t *eval)
{
QUANT(coeff)
get_vc2_ue_uint(abs(coeff), len, eval);
if (coeff) {
*eval = (*eval << 1) | (coeff < 0);
*len += 1;
}
}
static av_always_inline void coeff_quantize_encode(PutBitContext *pb, qcoef coeff,
int qfactor)
{
QUANT(coeff)
put_vc2_ue_uint(pb, abs(coeff));
if (coeff)
put_bits(pb, 1, coeff < 0);
}
/* 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;
int left = b->width * (sx+0) / s->num_x;
int right = b->width * (sx+1) / s->num_x;
int top = b->height * (sy+0) / s->num_y;
int bottom = b->height * (sy+1) / s->num_y;
int qfactor = ff_dirac_qscale_tab[quant];
uint8_t *len_lut = &s->coef_lut_len[2*quant*COEF_LUT_TAB + COEF_LUT_TAB];
uint32_t *val_lut = &s->coef_lut_val[2*quant*COEF_LUT_TAB + COEF_LUT_TAB];
dwtcoef *coeff = b->buf + top * b->stride;
for (y = top; y < bottom; y++) {
for (x = left; x < right; x++) {
if (coeff[x] >= -COEF_LUT_TAB && coeff[x] < COEF_LUT_TAB)
put_bits(pb, len_lut[coeff[x]], val_lut[coeff[x]]);
else
coeff_quantize_encode(pb, coeff[x], qfactor);
}
coeff += b->stride;
}
}
static int count_hq_slice(VC2EncContext *s, int slice_x,
int slice_y, int quant_idx)
{
int x, y, left, right, top, bottom, qfactor;
uint8_t quants[MAX_DWT_LEVELS][4];
int bits = 0, p, level, orientation;
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++) {
dwtcoef *buf;
SubBand *b = &s->plane[p].band[level][orientation];
quant_idx = quants[level][orientation];
qfactor = ff_dirac_qscale_tab[quant_idx];
left = b->width * slice_x / s->num_x;
right = b->width *(slice_x+1) / s->num_x;
top = b->height * slice_y / s->num_y;
bottom = b->height *(slice_y+1) / s->num_y;
buf = b->buf + top * b->stride;
for (y = top; y < bottom; y++) {
for (x = left; x < right; x++) {
qcoef coeff = (qcoef)buf[x];
if (coeff >= -COEF_LUT_TAB && coeff < COEF_LUT_TAB) {
bits += s->coef_lut_len[2*quant_idx*COEF_LUT_TAB + coeff + COEF_LUT_TAB];
} else {
QUANT(coeff)
bits += count_vc2_ue_uint(abs(coeff));
bits += !!coeff;
}
}
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;
}
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 sx = slice_dat->x;
const int sy = slice_dat->y;
int bits_last = INT_MAX, quant_buf[2] = {-1, -1};
int quant = s->q_start, range = s->q_start/3;
const int64_t top = slice_dat->bits_ceil;
const double percent = s->tolerance;
const double bottom = top - top*(percent/100.0f);
int bits = count_hq_slice(s, sx, sy, quant);
range -= range & 1; /* Make it an even number */
while ((bits > top) || (bits < bottom)) {
range *= bits > top ? +1 : -1;
quant = av_clip(quant + range, 0, s->q_ceil);
bits = count_hq_slice(s, sx, sy, quant);
range = av_clip(range/2, 1, s->q_ceil);
if (quant_buf[1] == quant) {
quant = bits_last < bits ? quant_buf[0] : quant;
bits = bits_last < bits ? bits_last : bits;
break;
}
quant_buf[1] = quant_buf[0];
quant_buf[0] = quant;
bits_last = bits;
}
slice_dat->quant_idx = av_clip(quant, 0, s->q_ceil);
slice_dat->bytes = FFALIGN((bits >> 3), s->size_scaler) + 4 + s->prefix_bytes;
return 0;
}
static void calc_slice_sizes(VC2EncContext *s)
{
int slice_x, slice_y;
SliceArgs *enc_args = s->slice_args;
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;
}
}
/* Determine quantization indices and bytes per slice */
s->avctx->execute(s->avctx, rate_control, enc_args, NULL, s->num_x*s->num_y,
sizeof(SliceArgs));
}
/* 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;
avpriv_align_put_bits(pb);
put_padding(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_bits_count(pb) >> 3;
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]);
}
}
avpriv_align_put_bits(pb);
bytes_len = (put_bits_count(pb) >> 3) - bytes_start - 1;
if (p == 2) {
int len_diff = slice_bytes_max - (put_bits_count(pb) >> 3);
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;
put_padding(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;
avpriv_align_put_bits(&s->pb);
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->q_start = (s->q_start + args->quant_idx)/2;
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;
}
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;
}
buf += p->coef_stride;
pix += pix_stride;
}
}
memset(buf, 0, (p->coef_stride*p->dwt_height - p->height*p->width)*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 void encode_frame(VC2EncContext *s, const AVFrame *frame,
const char *aux_data, int field)
{
int i;
/* 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);
avpriv_put_string(&s->pb, aux_data, 1);
}
/* Picture header */
encode_parse_info(s, DIRAC_PCODE_PICTURE_HQ);
encode_picture_start(s);
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];
}
/* Do a DWT transform */
s->avctx->execute(s->avctx, dwt_plane, s->transform_args, NULL, 3,
sizeof(TransformArgs));
/* Calculate per-slice quantizers and sizes */
calc_slice_sizes(s);
/* Init planes and encode slices */
encode_slices(s);
/* End sequence */
encode_parse_info(s, DIRAC_PCODE_END_SEQ);
}
static av_cold int vc2_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
const AVFrame *frame, int *got_packet_ptr)
{
int ret;
int max_frame_bytes, sig_size = 256;
VC2EncContext *s = avctx->priv_data;
const char aux_data[] = "FFmpeg version "FFMPEG_VERSION;
const int aux_data_size = sizeof(aux_data);
const int header_size = 100 + aux_data_size;
int64_t r_bitrate = avctx->bit_rate >> (s->interlaced);
s->avctx = avctx;
s->size_scaler = 1;
s->prefix_bytes = 0;
s->last_parse_code = 0;
s->next_parse_offset = 0;
/* Rate control */
max_frame_bytes = (av_rescale(r_bitrate, s->avctx->time_base.num,
s->avctx->time_base.den) >> 3) - header_size;
/* Find an appropriate size scaler */
while (sig_size > 255) {
s->slice_max_bytes = FFALIGN(av_rescale(max_frame_bytes, 1,
s->num_x*s->num_y), s->size_scaler);
s->slice_max_bytes += 4 + s->prefix_bytes;
sig_size = s->slice_max_bytes/s->size_scaler; /* Signalled slize size */
s->size_scaler <<= 1;
}
ret = ff_alloc_packet2(avctx, avpkt, max_frame_bytes*2, 0);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
return ret;
} else {
init_put_bits(&s->pb, avpkt->data, avpkt->size);
}
encode_frame(s, frame, aux_data, s->interlaced);
if (s->interlaced)
encode_frame(s, frame, NULL, 2);
flush_put_bits(&s->pb);
avpkt->size = put_bits_count(&s->pb) >> 3;
*got_packet_ptr = 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_start);
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);
av_freep(&s->coef_lut_len);
av_freep(&s->coef_lut_val);
return 0;
}
static av_cold int vc2_encode_init(AVCodecContext *avctx)
{
Plane *p;
SubBand *b;
int i, j, level, o, shift;
VC2EncContext *s = avctx->priv_data;
s->picture_number = 0;
/* Total allowed quantization range */
s->q_ceil = 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;
/* Mark unknown as progressive */
s->interlaced = !((avctx->field_order == AV_FIELD_UNKNOWN) ||
(avctx->field_order == AV_FIELD_PROGRESSIVE));
if (avctx->pix_fmt == AV_PIX_FMT_YUV422P10) {
if (avctx->width == 1280 && avctx->height == 720) {
s->level = 3;
if (avctx->time_base.num == 1001 && avctx->time_base.den == 60000)
s->base_vf = 9;
if (avctx->time_base.num == 1 && avctx->time_base.den == 50)
s->base_vf = 10;
} else if (avctx->width == 1920 && avctx->height == 1080) {
s->level = 3;
if (s->interlaced) {
if (avctx->time_base.num == 1001 && avctx->time_base.den == 30000)
s->base_vf = 11;
if (avctx->time_base.num == 1 && avctx->time_base.den == 50)
s->base_vf = 12;
} else {
if (avctx->time_base.num == 1001 && avctx->time_base.den == 60000)
s->base_vf = 13;
if (avctx->time_base.num == 1 && avctx->time_base.den == 50)
s->base_vf = 14;
if (avctx->time_base.num == 1001 && avctx->time_base.den == 24000)
s->base_vf = 21;
}
} else if (avctx->width == 3840 && avctx->height == 2160) {
s->level = 6;
if (avctx->time_base.num == 1001 && avctx->time_base.den == 60000)
s->base_vf = 17;
if (avctx->time_base.num == 1 && avctx->time_base.den == 50)
s->base_vf = 18;
}
}
if (s->interlaced && s->base_vf <= 0) {
av_log(avctx, AV_LOG_ERROR, "Interlacing not supported with non standard formats!\n");
return AVERROR_UNKNOWN;
}
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_UNOFFICIAL) {
s->strict_compliance = s->base_vf = 0;
av_log(avctx, AV_LOG_WARNING, "Disabling strict compliance\n");
} else {
av_log(avctx, AV_LOG_WARNING, "Given format does not strictly comply with "
"the specifications, please add a -strict -1 flag to use it\n");
return AVERROR_UNKNOWN;
}
} else {
av_log(avctx, AV_LOG_INFO, "Selected base video format = %i\n", s->base_vf);
}
avcodec_get_chroma_sub_sample(avctx->pix_fmt, &s->chroma_x_shift, &s->chroma_y_shift);
/* 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_malloc(p->coef_stride*p->dwt_height*sizeof(dwtcoef));
if (!p->coef_buf)
goto alloc_fail;
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[0].coef_stride,
s->plane[0].dwt_height))
goto alloc_fail;
}
/* 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_malloc(s->num_x*s->num_y*sizeof(SliceArgs));
if (!s->slice_args)
goto alloc_fail;
/* Lookup tables */
s->coef_lut_len = av_malloc(2*COEF_LUT_TAB*s->q_ceil*sizeof(*s->coef_lut_len));
if (!s->coef_lut_len)
goto alloc_fail;
s->coef_lut_val = av_malloc(2*COEF_LUT_TAB*s->q_ceil*sizeof(*s->coef_lut_val));
if (!s->coef_lut_val)
goto alloc_fail;
for (i = 0; i < s->q_ceil; i++) {
for (j = -COEF_LUT_TAB; j < COEF_LUT_TAB; j++) {
uint8_t *len_lut = &s->coef_lut_len[2*i*COEF_LUT_TAB + COEF_LUT_TAB];
uint32_t *val_lut = &s->coef_lut_val[2*i*COEF_LUT_TAB + COEF_LUT_TAB];
coeff_quantize_get(j, ff_dirac_qscale_tab[i], &len_lut[j], &val_lut[j]);
}
}
return 0;
alloc_fail:
vc2_encode_end(avctx);
av_log(avctx, AV_LOG_ERROR, "Unable to allocate memory!\n");
return AVERROR(ENOMEM);
}
#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 = 10.0f}, 0.0f, 45.0f, VC2ENC_FLAGS, "tolerance"},
{"slice_width", "Slice width", offsetof(VC2EncContext, slice_width), AV_OPT_TYPE_INT, {.i64 = 128}, 32, 1024, VC2ENC_FLAGS, "slice_width"},
{"slice_height", "Slice height", offsetof(VC2EncContext, slice_height), AV_OPT_TYPE_INT, {.i64 = 64}, 8, 1024, VC2ENC_FLAGS, "slice_height"},
{"wavelet_depth", "Transform depth", offsetof(VC2EncContext, wavelet_depth), AV_OPT_TYPE_INT, {.i64 = 5}, 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"},
{"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 AVCodecDefault 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
};
AVCodec ff_vc2_encoder = {
.name = "vc2",
.long_name = NULL_IF_CONFIG_SMALL("SMPTE VC-2"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_DIRAC,
.priv_data_size = sizeof(VC2EncContext),
.init = vc2_encode_init,
.close = vc2_encode_end,
.capabilities = AV_CODEC_CAP_SLICE_THREADS,
.encode2 = vc2_encode_frame,
.priv_class = &vc2enc_class,
.defaults = vc2enc_defaults,
.pix_fmts = allowed_pix_fmts
};
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