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FFmpeg/libavcodec/libjxldec.c

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/*
* JPEG XL decoding 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 decoder using libjxl
*/
#include "libavutil/avassert.h"
#include "libavutil/buffer.h"
#include "libavutil/common.h"
#include "libavutil/csp.h"
#include "libavutil/error.h"
#include "libavutil/mem.h"
#include "libavutil/pixdesc.h"
#include "libavutil/pixfmt.h"
#include "libavutil/frame.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "internal.h"
#include <jxl/decode.h>
#include <jxl/thread_parallel_runner.h>
#include "libjxl.h"
typedef struct LibJxlDecodeContext {
void *runner;
JxlDecoder *decoder;
JxlBasicInfo basic_info;
JxlPixelFormat jxl_pixfmt;
JxlDecoderStatus events;
AVBufferRef *iccp;
} LibJxlDecodeContext;
static int libjxl_init_jxl_decoder(AVCodecContext *avctx)
{
LibJxlDecodeContext *ctx = avctx->priv_data;
ctx->events = JXL_DEC_BASIC_INFO | JXL_DEC_FULL_IMAGE | JXL_DEC_COLOR_ENCODING;
if (JxlDecoderSubscribeEvents(ctx->decoder, ctx->events) != JXL_DEC_SUCCESS) {
av_log(avctx, AV_LOG_ERROR, "Error subscribing to JXL events\n");
return AVERROR_EXTERNAL;
}
if (JxlDecoderSetParallelRunner(ctx->decoder, JxlThreadParallelRunner, ctx->runner) != JXL_DEC_SUCCESS) {
av_log(avctx, AV_LOG_ERROR, "Failed to set JxlThreadParallelRunner\n");
return AVERROR_EXTERNAL;
}
memset(&ctx->basic_info, 0, sizeof(JxlBasicInfo));
memset(&ctx->jxl_pixfmt, 0, sizeof(JxlPixelFormat));
return 0;
}
static av_cold int libjxl_decode_init(AVCodecContext *avctx)
{
LibJxlDecodeContext *ctx = avctx->priv_data;
JxlMemoryManager manager;
ff_libjxl_init_memory_manager(&manager);
ctx->decoder = JxlDecoderCreate(&manager);
if (!ctx->decoder) {
av_log(avctx, AV_LOG_ERROR, "Failed to create JxlDecoder\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;
}
return libjxl_init_jxl_decoder(avctx);
}
static enum AVPixelFormat libjxl_get_pix_fmt(void *avctx, const JxlBasicInfo *basic_info, JxlPixelFormat *format)
{
format->endianness = JXL_NATIVE_ENDIAN;
format->num_channels = basic_info->num_color_channels + (basic_info->alpha_bits > 0);
/* Gray */
if (basic_info->num_color_channels == 1) {
if (basic_info->bits_per_sample <= 8) {
format->data_type = JXL_TYPE_UINT8;
return basic_info->alpha_bits ? AV_PIX_FMT_YA8 : AV_PIX_FMT_GRAY8;
}
if (basic_info->exponent_bits_per_sample || basic_info->bits_per_sample > 16) {
if (basic_info->alpha_bits)
return AV_PIX_FMT_NONE;
format->data_type = JXL_TYPE_FLOAT;
return AV_PIX_FMT_GRAYF32;
}
format->data_type = JXL_TYPE_UINT16;
return basic_info->alpha_bits ? AV_PIX_FMT_YA16 : AV_PIX_FMT_GRAY16;
}
/* rgb only */
/* libjxl only supports packed RGB and gray output at the moment */
if (basic_info->num_color_channels == 3) {
if (basic_info->bits_per_sample <= 8) {
format->data_type = JXL_TYPE_UINT8;
return basic_info->alpha_bits ? AV_PIX_FMT_RGBA : AV_PIX_FMT_RGB24;
}
if (basic_info->bits_per_sample > 16)
av_log(avctx, AV_LOG_WARNING, "Downsampling larger integer to 16-bit via libjxl\n");
if (basic_info->exponent_bits_per_sample)
av_log(avctx, AV_LOG_WARNING, "Downsampling float to 16-bit integer via libjxl\n");
format->data_type = JXL_TYPE_UINT16;
return basic_info->alpha_bits ? AV_PIX_FMT_RGBA64 : AV_PIX_FMT_RGB48;
}
return AV_PIX_FMT_NONE;
}
static enum AVColorPrimaries libjxl_get_primaries(void *avctx, const JxlColorEncoding *jxl_color)
{
AVColorPrimariesDesc desc;
enum AVColorPrimaries prim;
/* libjxl populates these double values even if it uses an enum space */
desc.prim.r.x = av_d2q(jxl_color->primaries_red_xy[0], 300000);
desc.prim.r.y = av_d2q(jxl_color->primaries_red_xy[1], 300000);
desc.prim.g.x = av_d2q(jxl_color->primaries_green_xy[0], 300000);
desc.prim.g.y = av_d2q(jxl_color->primaries_green_xy[1], 300000);
desc.prim.b.x = av_d2q(jxl_color->primaries_blue_xy[0], 300000);
desc.prim.b.y = av_d2q(jxl_color->primaries_blue_xy[1], 300000);
desc.wp.x = av_d2q(jxl_color->white_point_xy[0], 300000);
desc.wp.y = av_d2q(jxl_color->white_point_xy[1], 300000);
prim = av_csp_primaries_id_from_desc(&desc);
if (prim == AVCOL_PRI_UNSPECIFIED) {
/* try D65 with the same primaries */
/* BT.709 uses D65 white point */
desc.wp = av_csp_primaries_desc_from_id(AVCOL_PRI_BT709)->wp;
av_log(avctx, AV_LOG_WARNING, "Changing unknown white point to D65\n");
prim = av_csp_primaries_id_from_desc(&desc);
}
return prim;
}
static enum AVColorTransferCharacteristic libjxl_get_trc(void *avctx, const JxlColorEncoding *jxl_color)
{
switch (jxl_color->transfer_function) {
case JXL_TRANSFER_FUNCTION_709: return AVCOL_TRC_BT709;
case JXL_TRANSFER_FUNCTION_LINEAR: return AVCOL_TRC_LINEAR;
case JXL_TRANSFER_FUNCTION_SRGB: return AVCOL_TRC_IEC61966_2_1;
case JXL_TRANSFER_FUNCTION_PQ: return AVCOL_TRC_SMPTE2084;
case JXL_TRANSFER_FUNCTION_DCI: return AVCOL_TRC_SMPTE428;
case JXL_TRANSFER_FUNCTION_HLG: return AVCOL_TRC_ARIB_STD_B67;
case JXL_TRANSFER_FUNCTION_GAMMA:
if (jxl_color->gamma > 2.199 && jxl_color->gamma < 2.201)
return AVCOL_TRC_GAMMA22;
else if (jxl_color->gamma > 2.799 && jxl_color->gamma < 2.801)
return AVCOL_TRC_GAMMA28;
else
av_log(avctx, AV_LOG_WARNING, "Unsupported gamma transfer: %f\n", jxl_color->gamma);
break;
default:
av_log(avctx, AV_LOG_WARNING, "Unknown transfer function: %d\n", jxl_color->transfer_function);
}
return AVCOL_TRC_UNSPECIFIED;
}
static int libjxl_get_icc(AVCodecContext *avctx)
{
LibJxlDecodeContext *ctx = avctx->priv_data;
size_t icc_len;
JxlDecoderStatus jret;
/* an ICC profile is present, and we can meaningfully get it,
* because the pixel data is not XYB-encoded */
jret = JxlDecoderGetICCProfileSize(ctx->decoder, &ctx->jxl_pixfmt, JXL_COLOR_PROFILE_TARGET_DATA, &icc_len);
if (jret == JXL_DEC_SUCCESS && icc_len > 0) {
av_buffer_unref(&ctx->iccp);
ctx->iccp = av_buffer_alloc(icc_len);
if (!ctx->iccp)
return AVERROR(ENOMEM);
jret = JxlDecoderGetColorAsICCProfile(ctx->decoder, &ctx->jxl_pixfmt, JXL_COLOR_PROFILE_TARGET_DATA,
ctx->iccp->data, icc_len);
if (jret != JXL_DEC_SUCCESS) {
av_log(avctx, AV_LOG_WARNING, "Unable to obtain ICC Profile\n");
av_buffer_unref(&ctx->iccp);
}
}
return 0;
}
/*
* There's generally four cases when it comes to decoding a libjxl image
* with regard to color encoding:
* (a) There is an embedded ICC profile in the image, and the image is XYB-encoded.
* (b) There is an embedded ICC profile in the image, and the image is not XYB-encoded.
* (c) There is no embedded ICC profile, and FFmpeg supports the tagged colorspace.
* (d) There is no embedded ICC profile, and FFmpeg does not support the tagged colorspace.
*
* In case (b), we forward the pixel data as is and forward the ICC Profile as-is.
* In case (c), we request the pixel data in the space it's tagged as,
* and tag the space accordingly.
* In case (a), libjxl does not support getting the pixel data in the space described by the ICC
* profile, so instead we request the pixel data in BT.2020/PQ as it is the widest
* space that FFmpeg supports.
* In case (d), we also request wide-gamut pixel data as a fallback since FFmpeg doesn't support
* the custom primaries tagged in the space.
*/
static int libjxl_color_encoding_event(AVCodecContext *avctx, AVFrame *frame)
{
LibJxlDecodeContext *ctx = avctx->priv_data;
JxlDecoderStatus jret;
int ret;
JxlColorEncoding jxl_color;
/* set this flag if we need to fall back on wide gamut */
int fallback = 0;
jret = JxlDecoderGetColorAsEncodedProfile(ctx->decoder, NULL, JXL_COLOR_PROFILE_TARGET_ORIGINAL, &jxl_color);
if (jret == JXL_DEC_SUCCESS) {
/* enum values describe the colors of this image */
jret = JxlDecoderSetPreferredColorProfile(ctx->decoder, &jxl_color);
if (jret == JXL_DEC_SUCCESS)
jret = JxlDecoderGetColorAsEncodedProfile(ctx->decoder, &ctx->jxl_pixfmt, JXL_COLOR_PROFILE_TARGET_DATA, &jxl_color);
/* if we couldn't successfully request the pixel data space, we fall back on wide gamut */
/* this code path is very unlikely to happen in practice */
if (jret != JXL_DEC_SUCCESS)
fallback = 1;
} else {
/* an ICC Profile is present in the stream */
if (ctx->basic_info.uses_original_profile) {
/* uses_original_profile is the same as !xyb_encoded */
av_log(avctx, AV_LOG_VERBOSE, "Using embedded ICC Profile\n");
if ((ret = libjxl_get_icc(avctx)) < 0)
return ret;
} else {
/*
* an XYB-encoded image with an embedded ICC profile can't always have the
* pixel data requested in the original space, so libjxl has no feature
* to allow this to happen, so we fall back on wide gamut
*/
fallback = 1;
}
}
avctx->color_range = frame->color_range = AVCOL_RANGE_JPEG;
if (ctx->jxl_pixfmt.num_channels >= 3)
avctx->colorspace = AVCOL_SPC_RGB;
avctx->color_primaries = AVCOL_PRI_UNSPECIFIED;
avctx->color_trc = AVCOL_TRC_UNSPECIFIED;
if (!ctx->iccp) {
/* checking enum values */
if (!fallback) {
if (avctx->colorspace == AVCOL_SPC_RGB)
avctx->color_primaries = libjxl_get_primaries(avctx, &jxl_color);
avctx->color_trc = libjxl_get_trc(avctx, &jxl_color);
}
/* fall back on wide gamut if enum values fail */
if (avctx->color_primaries == AVCOL_PRI_UNSPECIFIED) {
if (avctx->colorspace == AVCOL_SPC_RGB) {
av_log(avctx, AV_LOG_WARNING, "Falling back on wide gamut output\n");
jxl_color.primaries = JXL_PRIMARIES_2100;
avctx->color_primaries = AVCOL_PRI_BT2020;
}
/* libjxl requires this set even for grayscale */
jxl_color.white_point = JXL_WHITE_POINT_D65;
}
if (avctx->color_trc == AVCOL_TRC_UNSPECIFIED) {
if (ctx->jxl_pixfmt.data_type == JXL_TYPE_FLOAT
|| ctx->jxl_pixfmt.data_type == JXL_TYPE_FLOAT16) {
av_log(avctx, AV_LOG_WARNING, "Falling back on Linear Light transfer\n");
jxl_color.transfer_function = JXL_TRANSFER_FUNCTION_LINEAR;
avctx->color_trc = AVCOL_TRC_LINEAR;
} else {
av_log(avctx, AV_LOG_WARNING, "Falling back on iec61966-2-1/sRGB transfer\n");
jxl_color.transfer_function = JXL_TRANSFER_FUNCTION_SRGB;
avctx->color_trc = AVCOL_TRC_IEC61966_2_1;
}
}
/* all colors will be in-gamut so we want accurate colors */
jxl_color.rendering_intent = JXL_RENDERING_INTENT_RELATIVE;
jxl_color.color_space = avctx->colorspace == AVCOL_SPC_RGB ? JXL_COLOR_SPACE_RGB : JXL_COLOR_SPACE_GRAY;
jret = JxlDecoderSetPreferredColorProfile(ctx->decoder, &jxl_color);
if (jret != JXL_DEC_SUCCESS) {
av_log(avctx, AV_LOG_WARNING, "Unable to set fallback color encoding\n");
/*
* This should only happen if there's a non-XYB encoded image with custom primaries
* embedded as enums and no embedded ICC Profile.
* In this case, libjxl will synthesize an ICC Profile for us.
*/
avctx->color_trc = AVCOL_TRC_UNSPECIFIED;
avctx->color_primaries = AVCOL_PRI_UNSPECIFIED;
if ((ret = libjxl_get_icc(avctx)) < 0)
return ret;
}
}
frame->color_trc = avctx->color_trc;
frame->color_primaries = avctx->color_primaries;
frame->colorspace = avctx->colorspace;
return 0;
}
static int libjxl_decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
{
LibJxlDecodeContext *ctx = avctx->priv_data;
const uint8_t *buf = avpkt->data;
size_t remaining = avpkt->size;
JxlDecoderStatus jret;
int ret;
*got_frame = 0;
while (1) {
jret = JxlDecoderSetInput(ctx->decoder, buf, remaining);
if (jret == JXL_DEC_ERROR) {
/* this should never happen here unless there's a bug in libjxl */
av_log(avctx, AV_LOG_ERROR, "Unknown libjxl decode error\n");
return AVERROR_EXTERNAL;
}
jret = JxlDecoderProcessInput(ctx->decoder);
/*
* JxlDecoderReleaseInput returns the number
* of bytes remaining to be read, rather than
* the number of bytes that it did read
*/
remaining = JxlDecoderReleaseInput(ctx->decoder);
buf = avpkt->data + avpkt->size - remaining;
switch(jret) {
case JXL_DEC_ERROR:
av_log(avctx, AV_LOG_ERROR, "Unknown libjxl decode error\n");
return AVERROR_INVALIDDATA;
case JXL_DEC_NEED_MORE_INPUT:
if (remaining == 0) {
av_log(avctx, AV_LOG_ERROR, "Unexpected end of JXL codestream\n");
return AVERROR_INVALIDDATA;
}
av_log(avctx, AV_LOG_DEBUG, "NEED_MORE_INPUT event emitted\n");
continue;
case JXL_DEC_BASIC_INFO:
av_log(avctx, AV_LOG_DEBUG, "BASIC_INFO event emitted\n");
if (JxlDecoderGetBasicInfo(ctx->decoder, &ctx->basic_info) != JXL_DEC_SUCCESS) {
/*
* this should never happen
* if it does it is likely a libjxl decoder bug
*/
av_log(avctx, AV_LOG_ERROR, "Bad libjxl basic info event\n");
return AVERROR_EXTERNAL;
}
avctx->pix_fmt = libjxl_get_pix_fmt(avctx, &ctx->basic_info, &ctx->jxl_pixfmt);
if (avctx->pix_fmt == AV_PIX_FMT_NONE) {
av_log(avctx, AV_LOG_ERROR, "Bad libjxl pixel format\n");
return AVERROR_EXTERNAL;
}
if ((ret = ff_set_dimensions(avctx, ctx->basic_info.xsize, ctx->basic_info.ysize)) < 0)
return ret;
continue;
case JXL_DEC_COLOR_ENCODING:
av_log(avctx, AV_LOG_DEBUG, "COLOR_ENCODING event emitted\n");
if ((ret = libjxl_color_encoding_event(avctx, frame)) < 0)
return ret;
continue;
case JXL_DEC_NEED_IMAGE_OUT_BUFFER:
av_log(avctx, AV_LOG_DEBUG, "NEED_IMAGE_OUT_BUFFER event emitted\n");
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
ctx->jxl_pixfmt.align = frame->linesize[0];
if (JxlDecoderSetImageOutBuffer(ctx->decoder, &ctx->jxl_pixfmt, frame->data[0], frame->buf[0]->size)
!= JXL_DEC_SUCCESS) {
av_log(avctx, AV_LOG_ERROR, "Bad libjxl dec need image out buffer event\n");
return AVERROR_EXTERNAL;
}
continue;
case JXL_DEC_FULL_IMAGE:
/* full image is one frame, even if animated */
av_log(avctx, AV_LOG_DEBUG, "FULL_IMAGE event emitted\n");
frame->pict_type = AV_PICTURE_TYPE_I;
frame->key_frame = 1;
if (ctx->iccp) {
AVFrameSideData *sd = av_frame_new_side_data_from_buf(frame, AV_FRAME_DATA_ICC_PROFILE, ctx->iccp);
if (!sd)
return AVERROR(ENOMEM);
/* ownership is transfered, and it is not ref-ed */
ctx->iccp = NULL;
}
*got_frame = 1;
return avpkt->size - remaining;
case JXL_DEC_SUCCESS:
av_log(avctx, AV_LOG_DEBUG, "SUCCESS event emitted\n");
/*
* The SUCCESS event isn't fired until after JXL_DEC_FULL_IMAGE. If this
* stream only contains one JXL image then JXL_DEC_SUCCESS will never fire.
* If the image2 sequence being decoded contains several JXL files, then
* libjxl will fire this event after the next AVPacket has been passed,
* which means the current packet is actually the next image in the sequence.
* This is why we reset the decoder and populate the packet data now, since
* this is the next packet and it has not been decoded yet. The decoder does
* have to be reset to allow us to use it for the next image, or libjxl
* will become very confused if the header information is not identical.
*/
JxlDecoderReset(ctx->decoder);
libjxl_init_jxl_decoder(avctx);
buf = avpkt->data;
remaining = avpkt->size;
continue;
default:
av_log(avctx, AV_LOG_ERROR, "Bad libjxl event: %d\n", jret);
return AVERROR_EXTERNAL;
}
}
}
static av_cold int libjxl_decode_close(AVCodecContext *avctx)
{
LibJxlDecodeContext *ctx = avctx->priv_data;
if (ctx->runner)
JxlThreadParallelRunnerDestroy(ctx->runner);
ctx->runner = NULL;
if (ctx->decoder)
JxlDecoderDestroy(ctx->decoder);
ctx->decoder = NULL;
av_buffer_unref(&ctx->iccp);
return 0;
}
const FFCodec ff_libjxl_decoder = {
.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(LibJxlDecodeContext),
.init = libjxl_decode_init,
FF_CODEC_DECODE_CB(libjxl_decode_frame),
.close = libjxl_decode_close,
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_OTHER_THREADS,
.caps_internal = FF_CODEC_CAP_NOT_INIT_THREADSAFE |
FF_CODEC_CAP_AUTO_THREADS | FF_CODEC_CAP_INIT_CLEANUP,
.p.wrapper_name = "libjxl",
};