// Copyright (c) the JPEG XL Project Authors. All rights reserved. // // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file.
// Information needed for encoding a frame that is not contained elsewhere and // does not belong to `cparams`. // TODO(lode): if possible, it might be better to replace FrameInfo and several // fields from ImageBundle (such as frame name and duration) by direct usage of // jxl::FrameHeader itself. struct FrameInfo { // TODO(veluca): consider adding more parameters, such as custom patches. bool save_before_color_transform = false; // Whether or not the input image bundle is already in the codestream // colorspace (as deduced by cparams). // TODO(veluca): this is a hack - ImageBundle doesn't have a simple way to say // "this is already in XYB". bool ib_needs_color_transform = true;
FrameType frame_type = FrameType::kRegularFrame;
size_t dc_level = 0; // Only used for kRegularFrame. bool is_last = true; bool is_preview = false; // Information for storing this frame for future use (only for non-DC frames).
size_t save_as_reference = 0; // The source frame for blending of a next frame, matching the // save_as_reference value of a previous frame. Animated frames can use // save_as_reference values 1, 2 and 3, while composite still frames can use // save_as_reference values 0, 1, 2 and 3. The current C++ encoder // implementation is assuming and using 1 for all frames of animations, so // using that as the default value here. // Corresponds to BlendingInfo::source from the FrameHeader.
size_t source = 1; // Corresponds to BlendingInfo::clamp from the FrameHeader. bool clamp = true; // Corresponds to BlendingInfo::alpha_channel from the FrameHeader, or set to // -1 to automatically choose it as the index of the first extra channel of // type alpha. int alpha_channel = -1;
// Animation-related information, corresponding to the timecode and duration // fields of the jxl::AnimationFrame of the jxl::FrameHeader.
uint32_t duration = 0;
uint32_t timecode = 0;
std::string name;
// If non-empty, uses this blending info for the extra channels, otherwise // automatically chooses it. The encoder API will fill this vector with the // extra channel info and allows more options. The non-API cjxl leaves it // empty and relies on the default behavior.
std::vector<BlendingInfo> extra_channel_blending_info;
};
// Checks and adjusts CompressParams when they are all initialized.
Status ParamsPostInit(CompressParams* p);
// Encodes a single frame (including its header) into a byte stream. Groups may // be processed in parallel by `pool`. metadata is the ImageMetadata encoded in // the codestream, and must be used for the FrameHeaders, do not use // ib.metadata.
Status EncodeFrame(JxlMemoryManager* memory_manager, const CompressParams& cparams_orig, const FrameInfo& frame_info, const CodecMetadata* metadata,
JxlEncoderChunkedFrameAdapter& frame_data, const JxlCmsInterface& cms, ThreadPool* pool,
JxlEncoderOutputProcessorWrapper* output_processor,
AuxOut* aux_out);
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