[FFmpeg-devel] [PATCH 2/4] avcodec/libjxl: add Jpeg XL decoding via libjxl

Leo Izen leo.izen at gmail.com
Thu Dec 30 21:10:44 EET 2021


This commit adds decoding support to libavcodec
for Jpeg XL images via the external library libjxl.
---
 MAINTAINERS               |   1 +
 configure                 |   5 +
 doc/general_contents.texi |   7 +
 libavcodec/Makefile       |   1 +
 libavcodec/allcodecs.c    |   1 +
 libavcodec/libjxl.c       |  70 ++++++++++
 libavcodec/libjxl.h       |  48 +++++++
 libavcodec/libjxldec.c    | 276 ++++++++++++++++++++++++++++++++++++++
 8 files changed, 409 insertions(+)
 create mode 100644 libavcodec/libjxl.c
 create mode 100644 libavcodec/libjxl.h
 create mode 100644 libavcodec/libjxldec.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 17c0104672..a649223bcb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -194,6 +194,7 @@ Codecs:
   libcodec2.c                           Tomas Härdin
   libdirac*                             David Conrad
   libdavs2.c                            Huiwen Ren
+  libjxl*.c, libjxl.h                   Leo Izen
   libgsm.c                              Michel Bardiaux
   libkvazaar.c                          Arttu Ylä-Outinen
   libopenh264enc.c                      Martin Storsjo, Linjie Fu
diff --git a/configure b/configure
index 23ef2abc9b..9317485131 100755
--- a/configure
+++ b/configure
@@ -241,6 +241,7 @@ External library support:
   --enable-libiec61883     enable iec61883 via libiec61883 [no]
   --enable-libilbc         enable iLBC de/encoding via libilbc [no]
   --enable-libjack         enable JACK audio sound server [no]
+  --enable-libjxl          enable JPEG XL decoding via libjxl [no]
   --enable-libklvanc       enable Kernel Labs VANC processing [no]
   --enable-libkvazaar      enable HEVC encoding via libkvazaar [no]
   --enable-liblensfun      enable lensfun lens correction [no]
@@ -1832,6 +1833,7 @@ EXTERNAL_LIBRARY_LIST="
     libiec61883
     libilbc
     libjack
+    libjxl
     libklvanc
     libkvazaar
     libmodplug
@@ -3328,6 +3330,7 @@ libgsm_ms_decoder_deps="libgsm"
 libgsm_ms_encoder_deps="libgsm"
 libilbc_decoder_deps="libilbc"
 libilbc_encoder_deps="libilbc"
+libjxl_decoder_deps="libjxl libjxl_threads"
 libkvazaar_encoder_deps="libkvazaar"
 libmodplug_demuxer_deps="libmodplug"
 libmp3lame_encoder_deps="libmp3lame"
@@ -6539,6 +6542,8 @@ enabled libgsm            && { for gsm_hdr in "gsm.h" "gsm/gsm.h"; do
                                    check_lib libgsm "${gsm_hdr}" gsm_create -lgsm && break;
                                done || die "ERROR: libgsm not found"; }
 enabled libilbc           && require libilbc ilbc.h WebRtcIlbcfix_InitDecode -lilbc $pthreads_extralibs
+enabled libjxl            && require_pkg_config libjxl "libjxl >= 0.7.0" jxl/decode.h JxlDecoderVersion &&
+                             require_pkg_config libjxl_threads "libjxl_threads >= 0.7.0" jxl/thread_parallel_runner.h JxlThreadParallelRunner
 enabled libklvanc         && require libklvanc libklvanc/vanc.h klvanc_context_create -lklvanc
 enabled libkvazaar        && require_pkg_config libkvazaar "kvazaar >= 0.8.1" kvazaar.h kvz_api_get
 enabled liblensfun        && require_pkg_config liblensfun lensfun lensfun.h lf_db_new
diff --git a/doc/general_contents.texi b/doc/general_contents.texi
index df1692c8df..2778e20091 100644
--- a/doc/general_contents.texi
+++ b/doc/general_contents.texi
@@ -171,6 +171,13 @@ Go to @url{https://github.com/TimothyGu/libilbc} and follow the instructions for
 installing the library. Then pass @code{--enable-libilbc} to configure to
 enable it.
 
+ at section libjxl
+
+JPEG XL is an image format intended to fully replace legacy JPEG for an extended
+period of life. See @url{https://jpegxl.info/} for more information, and see
+ at url{https://github.com/libjxl/libjxl} for the library source. You can pass
+ at code{--enable-libjxl} to configure in order enable the libjxl wrapper.
+
 @section libvpx
 
 FFmpeg can make use of the libvpx library for VP8/VP9 decoding and encoding.
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 4a41bb2825..b3dcc7dcb1 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -1038,6 +1038,7 @@ OBJS-$(CONFIG_LIBGSM_MS_DECODER)          += libgsmdec.o
 OBJS-$(CONFIG_LIBGSM_MS_ENCODER)          += libgsmenc.o
 OBJS-$(CONFIG_LIBILBC_DECODER)            += libilbc.o
 OBJS-$(CONFIG_LIBILBC_ENCODER)            += libilbc.o
+OBJS-$(CONFIG_LIBJXL_DECODER)             += libjxldec.o libjxl.o
 OBJS-$(CONFIG_LIBKVAZAAR_ENCODER)         += libkvazaar.o
 OBJS-$(CONFIG_LIBMP3LAME_ENCODER)         += libmp3lame.o
 OBJS-$(CONFIG_LIBOPENCORE_AMRNB_DECODER)  += libopencore-amr.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index d1e10197de..b41da3b0de 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -744,6 +744,7 @@ extern const AVCodec ff_libgsm_ms_encoder;
 extern const AVCodec ff_libgsm_ms_decoder;
 extern const AVCodec ff_libilbc_encoder;
 extern const AVCodec ff_libilbc_decoder;
+extern const AVCodec ff_libjxl_decoder;
 extern const AVCodec ff_libmp3lame_encoder;
 extern const AVCodec ff_libopencore_amrnb_encoder;
 extern const AVCodec ff_libopencore_amrnb_decoder;
diff --git a/libavcodec/libjxl.c b/libavcodec/libjxl.c
new file mode 100644
index 0000000000..204d91d8a8
--- /dev/null
+++ b/libavcodec/libjxl.c
@@ -0,0 +1,70 @@
+/*
+ * JPEG XL de/encoding via libjxl, common support implementation
+ * Copyright (c) 2021 Leo Izen <leo.izen at 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 via libjxl common support implementation
+ */
+
+#include "libavutil/cpu.h"
+#include "libavutil/mem.h"
+
+#include <jxl/memory_manager.h>
+#include "libjxl.h"
+
+size_t ff_libjxl_get_threadcount(int threads)
+{
+    if (threads <= 0)
+        return av_cpu_count();
+    if (threads == 1)
+        return 0;
+    return threads;
+}
+
+/**
+ * Wrapper around av_malloc used as a jpegxl_alloc_func.
+ *
+ * @param  opaque opaque pointer for jpegxl_alloc_func, always ignored
+ * @param  size Size in bytes for the memory block to be allocated
+ * @return Pointer to the allocated block, or `NULL` if it cannot be allocated
+ */
+static void *libjxl_av_malloc(void *opaque, size_t size)
+{
+    return av_malloc(size);
+}
+
+/**
+ * Wrapper around av_free used as a jpegxl_free_func.
+ *
+ * @param opaque  opaque pointer for jpegxl_free_func, always ignored
+ * @param address Pointer to the allocated block, to free. `NULL` permitted as a no-op.
+ */
+static void libjxl_av_free(void *opaque, void *address)
+{
+    av_free(address);
+}
+
+void ff_libjxl_init_memory_manager(JxlMemoryManager *manager)
+{
+    manager->opaque = NULL;
+    manager->alloc = &libjxl_av_malloc;
+    manager->free = &libjxl_av_free;
+}
diff --git a/libavcodec/libjxl.h b/libavcodec/libjxl.h
new file mode 100644
index 0000000000..5387c438fd
--- /dev/null
+++ b/libavcodec/libjxl.h
@@ -0,0 +1,48 @@
+/*
+ * JPEG XL de/encoding via libjxl, common support header
+ * Copyright (c) 2021 Leo Izen <leo.izen at 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 via libjxl common support header
+ */
+
+#ifndef AVCODEC_LIBJXL_H
+#define AVCODEC_LIBJXL_H
+
+#include <jxl/memory_manager.h>
+
+/**
+ * Transform threadcount in ffmpeg to one used by libjxl.
+ *
+ * @param  threads ffmpeg's threads AVOption
+ * @return         thread count for libjxl's parallel runner
+ */
+size_t ff_libjxl_get_threadcount(int threads);
+
+/**
+ * Initialize and populate a JxlMemoryManager
+ * with av_malloc() and av_free() so libjxl will use these
+ * functions.
+ * @param manager a pointer to a JxlMemoryManager struct
+ */
+void ff_libjxl_init_memory_manager(JxlMemoryManager *manager);
+
+#endif /* AVCODEC_LIBJXL_H */
diff --git a/libavcodec/libjxldec.c b/libavcodec/libjxldec.c
new file mode 100644
index 0000000000..ba4a3c4f3a
--- /dev/null
+++ b/libavcodec/libjxldec.c
@@ -0,0 +1,276 @@
+/*
+ * JPEG XL decoding support via libjxl
+ * Copyright (c) 2021 Leo Izen <leo.izen at 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/common.h"
+#include "libavutil/error.h"
+#include "libavutil/mem.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/pixfmt.h"
+#include "libavutil/frame.h"
+#include "libavutil/version.h"
+
+#include "avcodec.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;
+} 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_FRAME;
+    if (JxlDecoderSubscribeEvents(ctx->decoder, ctx->events) != JXL_DEC_SUCCESS) {
+        av_log(avctx, AV_LOG_ERROR, "Error subscribing to JXL events");
+        return AVERROR_EXTERNAL;
+    }
+
+    if (JxlDecoderSetParallelRunner(ctx->decoder, JxlThreadParallelRunner, ctx->runner) != JXL_DEC_SUCCESS) {
+        av_log(avctx, AV_LOG_ERROR, "Failed to set JxlThreadParallelRunner");
+        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");
+        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");
+        return AVERROR_EXTERNAL;
+    }
+
+    return libjxl_init_jxl_decoder(avctx);
+}
+
+static enum AVPixelFormat libjxl_get_pix_fmt(AVCodecContext *avctx, JxlBasicInfo *basic_info, JxlPixelFormat *format)
+{
+    format->endianness = JXL_LITTLE_ENDIAN;
+    format->num_channels = basic_info->num_color_channels + (basic_info->alpha_bits > 0);
+    /* av_malloc handles alignment already */
+    format->align = 1;
+    /* 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_GRAYF32LE;
+        }
+        format->data_type = JXL_TYPE_UINT16;
+        return basic_info->alpha_bits ? AV_PIX_FMT_YA16LE : AV_PIX_FMT_GRAY16LE;
+    }
+    /* 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_RGBA64LE : AV_PIX_FMT_RGB48LE;
+    }
+    return AV_PIX_FMT_NONE;
+}
+
+static void libjxl_row_fill(void *avframe, size_t x, size_t y, size_t num_pixels, const void *pixels)
+{
+    AVFrame *frame = avframe;
+    int bytes = av_get_padded_bits_per_pixel(av_pix_fmt_desc_get(frame->format)) / 8;
+    size_t offset = y * frame->linesize[0] + x * bytes;
+    memcpy(frame->data[0] + offset, pixels, num_pixels * bytes);
+}
+
+static int libjxl_decode_frame(AVCodecContext *avctx, void *avframe, int *got_frame, AVPacket *avpkt)
+{
+    LibJxlDecodeContext *ctx = avctx->priv_data;
+    uint8_t *buf = avpkt->data;
+    size_t remaining = avpkt->size;
+    AVFrame *frame = avframe;
+    JxlDecoderStatus status;
+    int ff_status;
+    *got_frame = 0;
+
+    for (;;) {
+        /*
+         * it only returns JXL_DEC_ERROR here if the input
+         * was not released since the last time this was called
+         * if this happens, it's a programmer error
+         */
+        status = JxlDecoderSetInput(ctx->decoder, buf, remaining);
+        av_assert0(status != JXL_DEC_ERROR);
+
+        status = 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(status) {
+        case JXL_DEC_ERROR:
+            av_log(avctx, AV_LOG_ERROR, "Unknown libjxl decode error\n");
+            return AVERROR_EXTERNAL;
+        case JXL_DEC_NEED_MORE_INPUT:
+            if (remaining == 0) {
+                av_log(avctx, AV_LOG_WARNING, "Unexpected end of JXL codestream\n");
+                return AVERROR(EAGAIN);
+            }
+            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;
+            }
+            ff_status = ff_set_dimensions(avctx, ctx->basic_info.xsize, ctx->basic_info.ysize);
+            if (ff_status < 0)
+                return ff_status;
+            /*
+             * We rewind the decoder and ask for everything again
+             * This futureproofs the decoder since it will make
+             * adding a parser or a dedicated demuxer much easier
+             */
+            buf = avpkt->data;
+            remaining = avpkt->size;
+            JxlDecoderRewind(ctx->decoder);
+            ctx->events &= ~JXL_DEC_BASIC_INFO;
+            if (JxlDecoderSubscribeEvents(ctx->decoder, ctx->events) != JXL_DEC_SUCCESS) {
+                av_log(avctx, AV_LOG_ERROR, "Error subscribing to JXL events after rewind\n");
+                return AVERROR_EXTERNAL;
+            }
+            continue;
+        case JXL_DEC_FRAME:
+        case JXL_DEC_NEED_IMAGE_OUT_BUFFER:
+            /*
+             * We don't do this at basic info time
+             * because it will happen again when we
+             * rewind anyway
+             */
+            av_log(avctx, AV_LOG_DEBUG, "%s event emitted\n", status == JXL_DEC_FRAME ? "FRAME" : "NEED_IMAGE_OUT_BUFFER");
+            ff_status = ff_get_buffer(avctx, frame, 0);
+            if (ff_status < 0)
+                return ff_status;
+            if (JxlDecoderSetImageOutCallback(ctx->decoder, &ctx->jxl_pixfmt, &libjxl_row_fill, frame) != 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");
+            *got_frame = 1;
+            frame->pict_type = AV_PICTURE_TYPE_I;
+            frame->key_frame = 1;
+            return avpkt->size - remaining;
+        case JXL_DEC_SUCCESS:
+            av_log(avctx, AV_LOG_DEBUG, "SUCCESS event emitted\n");
+            /*
+             * The file has finished decoding
+             * reset the decoder to let us
+             * reuse it again for the next image
+             */
+            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", status);
+             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;
+    return 0;
+}
+
+const AVCodec ff_libjxl_decoder = {
+    .name           = "libjxl",
+    .long_name      = NULL_IF_CONFIG_SMALL("libjxl JPEG XL decoder"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_JPEGXL,
+    .priv_data_size = sizeof(LibJxlDecodeContext),
+    .init           = libjxl_decode_init,
+    .decode         = libjxl_decode_frame,
+    .close          = libjxl_decode_close,
+    .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_OTHER_THREADS,
+    .caps_internal  = FF_CODEC_CAP_AUTO_THREADS | FF_CODEC_CAP_INIT_CLEANUP,
+    .wrapper_name   = "libjxl",
+};
-- 
2.34.1



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