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ffmpeg/libavcodec/libjxlenc.c

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/*
* JPEG XL encoding support via libjxl
* Copyright (c) 2021 Leo Izen <leo.izen@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
*/
/**
* @file
* JPEG XL encoder using libjxl
*/
#include <string.h>
#include "libavutil/avutil.h"
#include "libavutil/csp.h"
#include "libavutil/error.h"
#include "libavutil/frame.h"
#include "libavutil/libm.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/pixfmt.h"
#include "libavutil/version.h"
#include "avcodec.h"
#include "encode.h"
#include "codec_internal.h"
#include <jxl/encode.h>
#include <jxl/thread_parallel_runner.h>
#include "libjxl.h"
typedef struct LibJxlEncodeContext {
AVClass *class;
void *runner;
JxlEncoder *encoder;
JxlEncoderFrameSettings *options;
int effort;
float distance;
int modular;
uint8_t *buffer;
size_t buffer_size;
} LibJxlEncodeContext;
/**
* Map a quality setting for -qscale roughly from libjpeg
* quality numbers to libjxl's butteraugli distance for
* photographic content.
*
* Setting distance explicitly is preferred, but this will
* allow qscale to be used as a fallback.
*
* This function is continuous and injective on [0, 100] which
* makes it monotonic.
*
* @param quality 0.0 to 100.0 quality setting, libjpeg quality
* @return Butteraugli distance between 0.0 and 15.0
*/
static float quality_to_distance(float quality)
{
if (quality >= 100.0)
return 0.0;
else if (quality >= 90.0)
return (100.0 - quality) * 0.10;
else if (quality >= 30.0)
return 0.1 + (100.0 - quality) * 0.09;
else if (quality > 0.0)
return 15.0 + (59.0 * quality - 4350.0) * quality / 9000.0;
else
return 15.0;
}
/**
* Initalize the decoder on a per-frame basis. All of these need to be set
* once each time the decoder is reset, which it must be each frame to make
* the image2 muxer work.
*
* @return 0 upon success, negative on failure.
*/
static int libjxl_init_jxl_encoder(AVCodecContext *avctx)
{
LibJxlEncodeContext *ctx = avctx->priv_data;
/* reset the encoder every frame for image2 muxer */
JxlEncoderReset(ctx->encoder);
ctx->options = JxlEncoderFrameSettingsCreate(ctx->encoder, NULL);
if (!ctx->options) {
av_log(avctx, AV_LOG_ERROR, "Failed to create JxlEncoderOptions\n");
return AVERROR_EXTERNAL;
}
/* This needs to be set each time the decoder is reset */
if (JxlEncoderSetParallelRunner(ctx->encoder, JxlThreadParallelRunner, ctx->runner)
!= JXL_ENC_SUCCESS) {
av_log(avctx, AV_LOG_ERROR, "Failed to set JxlThreadParallelRunner\n");
return AVERROR_EXTERNAL;
}
/* these shouldn't fail, libjxl bug notwithstanding */
if (JxlEncoderFrameSettingsSetOption(ctx->options, JXL_ENC_FRAME_SETTING_EFFORT, ctx->effort)
!= JXL_ENC_SUCCESS) {
av_log(avctx, AV_LOG_ERROR, "Failed to set effort to: %d\n", ctx->effort);
return AVERROR_EXTERNAL;
}
/* check for negative, our default */
if (ctx->distance < 0.0) {
/* use ffmpeg.c -q option if passed */
if (avctx->flags & AV_CODEC_FLAG_QSCALE)
ctx->distance = quality_to_distance((float)avctx->global_quality / FF_QP2LAMBDA);
else
/* default 1.0 matches cjxl */
ctx->distance = 1.0;
}
/*
* 0.01 is the minimum distance accepted for lossy
* interpreting any positive value less than this as minimum
*/
if (ctx->distance > 0.0 && ctx->distance < 0.01)
ctx->distance = 0.01;
if (JxlEncoderSetFrameDistance(ctx->options, ctx->distance) != JXL_ENC_SUCCESS) {
av_log(avctx, AV_LOG_ERROR, "Failed to set distance: %f\n", ctx->distance);
return AVERROR_EXTERNAL;
}
/*
* In theory the library should automatically enable modular if necessary,
* but it appears it won't at the moment due to a bug. This will still
* work even if that is patched.
*/
if (JxlEncoderFrameSettingsSetOption(ctx->options, JXL_ENC_FRAME_SETTING_MODULAR,
ctx->modular || ctx->distance <= 0.0 ? 1 : -1) != JXL_ENC_SUCCESS) {
av_log(avctx, AV_LOG_ERROR, "Failed to set modular\n");
return AVERROR_EXTERNAL;
}
return 0;
}
/**
* Global encoder initialization. This only needs to be run once,
* not every frame.
*/
static av_cold int libjxl_encode_init(AVCodecContext *avctx)
{
LibJxlEncodeContext *ctx = avctx->priv_data;
JxlMemoryManager manager;
ff_libjxl_init_memory_manager(&manager);
ctx->encoder = JxlEncoderCreate(&manager);
if (!ctx->encoder) {
av_log(avctx, AV_LOG_ERROR, "Failed to create JxlEncoder\n");
return AVERROR_EXTERNAL;
}
ctx->runner = JxlThreadParallelRunnerCreate(&manager, ff_libjxl_get_threadcount(avctx->thread_count));
if (!ctx->runner) {
av_log(avctx, AV_LOG_ERROR, "Failed to create JxlThreadParallelRunner\n");
return AVERROR_EXTERNAL;
}
ctx->buffer_size = 4096;
ctx->buffer = av_realloc(NULL, ctx->buffer_size);
if (!ctx->buffer) {
av_log(avctx, AV_LOG_ERROR, "Could not allocate encoding buffer\n");
return AVERROR(ENOMEM);
}
return 0;
}
/**
* Populate a JxlColorEncoding with the given enum AVColorPrimaries.
* @return < 0 upon failure, >= 0 upon success
*/
static int libjxl_populate_primaries(void *avctx, JxlColorEncoding *jxl_color, enum AVColorPrimaries prm)
{
const AVColorPrimariesDesc *desc;
switch (prm) {
case AVCOL_PRI_BT709:
jxl_color->primaries = JXL_PRIMARIES_SRGB;
jxl_color->white_point = JXL_WHITE_POINT_D65;
return 0;
case AVCOL_PRI_BT2020:
jxl_color->primaries = JXL_PRIMARIES_2100;
jxl_color->white_point = JXL_WHITE_POINT_D65;
return 0;
case AVCOL_PRI_SMPTE431:
jxl_color->primaries = JXL_PRIMARIES_P3;
jxl_color->white_point = JXL_WHITE_POINT_DCI;
return 0;
case AVCOL_PRI_SMPTE432:
jxl_color->primaries = JXL_PRIMARIES_P3;
jxl_color->white_point = JXL_WHITE_POINT_D65;
return 0;
case AVCOL_PRI_UNSPECIFIED:
av_log(avctx, AV_LOG_WARNING, "Unknown primaries, assuming BT.709/sRGB. Colors may be wrong.\n");
jxl_color->primaries = JXL_PRIMARIES_SRGB;
jxl_color->white_point = JXL_WHITE_POINT_D65;
return 0;
}
desc = av_csp_primaries_desc_from_id(prm);
if (!desc)
return AVERROR(EINVAL);
jxl_color->primaries = JXL_PRIMARIES_CUSTOM;
jxl_color->white_point = JXL_WHITE_POINT_CUSTOM;
jxl_color->primaries_red_xy[0] = av_q2d(desc->prim.r.x);
jxl_color->primaries_red_xy[1] = av_q2d(desc->prim.r.y);
jxl_color->primaries_green_xy[0] = av_q2d(desc->prim.g.x);
jxl_color->primaries_green_xy[1] = av_q2d(desc->prim.g.y);
jxl_color->primaries_blue_xy[0] = av_q2d(desc->prim.b.x);
jxl_color->primaries_blue_xy[1] = av_q2d(desc->prim.b.y);
jxl_color->white_point_xy[0] = av_q2d(desc->wp.x);
jxl_color->white_point_xy[1] = av_q2d(desc->wp.y);
return 0;
}
/**
* Encode an entire frame. Currently animation, is not supported by
* this encoder, so this will always reinitialize a new still image
* and encode a one-frame image (for image2 and image2pipe).
*/
static int libjxl_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet)
{
LibJxlEncodeContext *ctx = avctx->priv_data;
AVFrameSideData *sd;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(frame->format);
JxlBasicInfo info;
JxlColorEncoding jxl_color;
JxlPixelFormat jxl_fmt;
JxlEncoderStatus jret;
int ret;
size_t available = ctx->buffer_size;
size_t bytes_written = 0;
uint8_t *next_out = ctx->buffer;
ret = libjxl_init_jxl_encoder(avctx);
if (ret) {
av_log(avctx, AV_LOG_ERROR, "Error frame-initializing JxlEncoder\n");
return ret;
}
/* populate the basic info settings */
JxlEncoderInitBasicInfo(&info);
jxl_fmt.num_channels = pix_desc->nb_components;
info.xsize = frame->width;
info.ysize = frame->height;
info.num_extra_channels = (jxl_fmt.num_channels + 1) % 2;
info.num_color_channels = jxl_fmt.num_channels - info.num_extra_channels;
info.bits_per_sample = av_get_bits_per_pixel(pix_desc) / jxl_fmt.num_channels;
info.alpha_bits = (info.num_extra_channels > 0) * info.bits_per_sample;
if (pix_desc->flags & AV_PIX_FMT_FLAG_FLOAT) {
info.exponent_bits_per_sample = info.bits_per_sample > 16 ? 8 : 5;
info.alpha_exponent_bits = info.alpha_bits ? info.exponent_bits_per_sample : 0;
jxl_fmt.data_type = info.bits_per_sample > 16 ? JXL_TYPE_FLOAT : JXL_TYPE_FLOAT16;
} else {
info.exponent_bits_per_sample = 0;
info.alpha_exponent_bits = 0;
jxl_fmt.data_type = info.bits_per_sample <= 8 ? JXL_TYPE_UINT8 : JXL_TYPE_UINT16;
}
/* JPEG XL format itself does not support limited range */
if (avctx->color_range == AVCOL_RANGE_MPEG ||
avctx->color_range == AVCOL_RANGE_UNSPECIFIED && frame->color_range == AVCOL_RANGE_MPEG)
av_log(avctx, AV_LOG_WARNING, "This encoder does not support limited (tv) range, colors will be wrong!\n");
else if (avctx->color_range != AVCOL_RANGE_JPEG && frame->color_range != AVCOL_RANGE_JPEG)
av_log(avctx, AV_LOG_WARNING, "Unknown color range, assuming full (pc)\n");
/* bitexact lossless requires there to be no XYB transform */
info.uses_original_profile = ctx->distance == 0.0;
if (JxlEncoderSetBasicInfo(ctx->encoder, &info) != JXL_ENC_SUCCESS) {
av_log(avctx, AV_LOG_ERROR, "Failed to set JxlBasicInfo\n");
return AVERROR_EXTERNAL;
}
/* rendering intent doesn't matter here
* but libjxl will whine if we don't set it */
jxl_color.rendering_intent = JXL_RENDERING_INTENT_RELATIVE;
switch (frame->color_trc && frame->color_trc != AVCOL_TRC_UNSPECIFIED
? frame->color_trc : avctx->color_trc) {
case AVCOL_TRC_BT709:
jxl_color.transfer_function = JXL_TRANSFER_FUNCTION_709;
break;
case AVCOL_TRC_LINEAR:
jxl_color.transfer_function = JXL_TRANSFER_FUNCTION_LINEAR;
break;
case AVCOL_TRC_IEC61966_2_1:
jxl_color.transfer_function = JXL_TRANSFER_FUNCTION_SRGB;
break;
case AVCOL_TRC_SMPTE428:
jxl_color.transfer_function = JXL_TRANSFER_FUNCTION_DCI;
break;
case AVCOL_TRC_SMPTE2084:
jxl_color.transfer_function = JXL_TRANSFER_FUNCTION_PQ;
break;
case AVCOL_TRC_ARIB_STD_B67:
jxl_color.transfer_function = JXL_TRANSFER_FUNCTION_HLG;
break;
case AVCOL_TRC_GAMMA22:
jxl_color.transfer_function = JXL_TRANSFER_FUNCTION_GAMMA;
jxl_color.gamma = 2.2;
break;
case AVCOL_TRC_GAMMA28:
jxl_color.transfer_function = JXL_TRANSFER_FUNCTION_GAMMA;
jxl_color.gamma = 2.8;
break;
default:
if (pix_desc->flags & AV_PIX_FMT_FLAG_FLOAT) {
av_log(avctx, AV_LOG_WARNING, "Unknown transfer function, assuming Linear Light. Colors may be wrong.\n");
jxl_color.transfer_function = JXL_TRANSFER_FUNCTION_LINEAR;
} else {
av_log(avctx, AV_LOG_WARNING, "Unknown transfer function, assuming IEC61966-2-1/sRGB. Colors may be wrong.\n");
jxl_color.transfer_function = JXL_TRANSFER_FUNCTION_SRGB;
}
}
/* This should be implied to be honest
* but a libjxl bug makes it fail otherwise */
if (info.num_color_channels == 1)
jxl_color.color_space = JXL_COLOR_SPACE_GRAY;
else
jxl_color.color_space = JXL_COLOR_SPACE_RGB;
ret = libjxl_populate_primaries(avctx, &jxl_color,
frame->color_primaries && frame->color_primaries != AVCOL_PRI_UNSPECIFIED
? frame->color_primaries : avctx->color_primaries);
if (ret < 0)
return ret;
sd = av_frame_get_side_data(frame, AV_FRAME_DATA_ICC_PROFILE);
if (sd && sd->size && JxlEncoderSetICCProfile(ctx->encoder, sd->data, sd->size) != JXL_ENC_SUCCESS)
av_log(avctx, AV_LOG_WARNING, "Could not set ICC Profile\n");
if (JxlEncoderSetColorEncoding(ctx->encoder, &jxl_color) != JXL_ENC_SUCCESS)
av_log(avctx, AV_LOG_WARNING, "Failed to set JxlColorEncoding\n");
/* depending on basic info, level 10 might
* be required instead of level 5 */
if (JxlEncoderGetRequiredCodestreamLevel(ctx->encoder) > 5) {
if (JxlEncoderSetCodestreamLevel(ctx->encoder, 10) != JXL_ENC_SUCCESS)
av_log(avctx, AV_LOG_WARNING, "Could not increase codestream level\n");
}
jxl_fmt.endianness = JXL_NATIVE_ENDIAN;
jxl_fmt.align = frame->linesize[0];
if (JxlEncoderAddImageFrame(ctx->options, &jxl_fmt, frame->data[0], jxl_fmt.align * info.ysize) != JXL_ENC_SUCCESS) {
av_log(avctx, AV_LOG_ERROR, "Failed to add Image Frame\n");
return AVERROR_EXTERNAL;
}
/*
* Run this after the last frame in the image has been passed.
* TODO support animation
*/
JxlEncoderCloseInput(ctx->encoder);
while (1) {
jret = JxlEncoderProcessOutput(ctx->encoder, &next_out, &available);
if (jret == JXL_ENC_ERROR) {
av_log(avctx, AV_LOG_ERROR, "Unspecified libjxl error occurred\n");
return AVERROR_EXTERNAL;
}
bytes_written = ctx->buffer_size - available;
/* all data passed has been encoded */
if (jret == JXL_ENC_SUCCESS)
break;
if (jret == JXL_ENC_NEED_MORE_OUTPUT) {
/*
* at the moment, libjxl has no way to
* tell us how much space it actually needs
* so we need to malloc loop
*/
uint8_t *temp;
size_t new_size = ctx->buffer_size * 2;
temp = av_realloc(ctx->buffer, new_size);
if (!temp)
return AVERROR(ENOMEM);
ctx->buffer = temp;
ctx->buffer_size = new_size;
next_out = ctx->buffer + bytes_written;
available = new_size - bytes_written;
continue;
}
av_log(avctx, AV_LOG_ERROR, "Bad libjxl event: %d\n", jret);
return AVERROR_EXTERNAL;
}
ret = ff_get_encode_buffer(avctx, pkt, bytes_written, 0);
if (ret < 0)
return ret;
memcpy(pkt->data, ctx->buffer, bytes_written);
*got_packet = 1;
return 0;
}
static av_cold int libjxl_encode_close(AVCodecContext *avctx)
{
LibJxlEncodeContext *ctx = avctx->priv_data;
if (ctx->runner)
JxlThreadParallelRunnerDestroy(ctx->runner);
ctx->runner = NULL;
/*
* destroying the decoder also frees
* ctx->options so we don't need to
*/
if (ctx->encoder)
JxlEncoderDestroy(ctx->encoder);
ctx->encoder = NULL;
av_freep(&ctx->buffer);
return 0;
}
#define OFFSET(x) offsetof(LibJxlEncodeContext, x)
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption libjxl_encode_options[] = {
{ "effort", "Encoding effort", OFFSET(effort), AV_OPT_TYPE_INT, { .i64 = 7 }, 1, 9, VE },
{ "distance", "Maximum Butteraugli distance (quality setting, "
"lower = better, zero = lossless, default 1.0)", OFFSET(distance), AV_OPT_TYPE_FLOAT, { .dbl = -1.0 }, -1.0, 15.0, VE },
{ "modular", "Force modular mode", OFFSET(modular), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
{ NULL },
};
static const AVClass libjxl_encode_class = {
.class_name = "libjxl",
.item_name = av_default_item_name,
.option = libjxl_encode_options,
.version = LIBAVUTIL_VERSION_INT,
};
const FFCodec ff_libjxl_encoder = {
.p.name = "libjxl",
.p.long_name = NULL_IF_CONFIG_SMALL("libjxl JPEG XL"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_JPEGXL,
.priv_data_size = sizeof(LibJxlEncodeContext),
.init = libjxl_encode_init,
FF_CODEC_ENCODE_CB(libjxl_encode_frame),
.close = libjxl_encode_close,
.p.capabilities = AV_CODEC_CAP_OTHER_THREADS,
.caps_internal = FF_CODEC_CAP_NOT_INIT_THREADSAFE |
FF_CODEC_CAP_AUTO_THREADS | FF_CODEC_CAP_INIT_CLEANUP |
FF_CODEC_CAP_ICC_PROFILES,
.p.pix_fmts = (const enum AVPixelFormat[]) {
AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA,
AV_PIX_FMT_RGB48, AV_PIX_FMT_RGBA64,
AV_PIX_FMT_GRAY8, AV_PIX_FMT_YA8,
AV_PIX_FMT_GRAY16, AV_PIX_FMT_YA16,
AV_PIX_FMT_GRAYF32,
AV_PIX_FMT_NONE
},
.p.priv_class = &libjxl_encode_class,
.p.wrapper_name = "libjxl",
};
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