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329 lines
12 KiB
C
329 lines
12 KiB
C
/*
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* Copyright © 2018-2021, VideoLAN and dav1d authors
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* Copyright © 2018, Two Orioles, LLC
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef DAV1D_H
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#define DAV1D_H
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#include <errno.h>
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#include <stdarg.h>
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#include "common.h"
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#include "picture.h"
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#include "data.h"
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#include "version.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct Dav1dContext Dav1dContext;
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typedef struct Dav1dRef Dav1dRef;
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#define DAV1D_MAX_THREADS 256
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#define DAV1D_MAX_FRAME_DELAY 256
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typedef struct Dav1dLogger {
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void *cookie; ///< Custom data to pass to the callback.
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/**
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* Logger callback. May be NULL to disable logging.
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*
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* @param cookie Custom pointer passed to all calls.
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* @param format The vprintf compatible format string.
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* @param ap List of arguments referenced by the format string.
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*/
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void (*callback)(void *cookie, const char *format, va_list ap);
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} Dav1dLogger;
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enum Dav1dInloopFilterType {
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DAV1D_INLOOPFILTER_NONE = 0,
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DAV1D_INLOOPFILTER_DEBLOCK = 1 << 0,
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DAV1D_INLOOPFILTER_CDEF = 1 << 1,
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DAV1D_INLOOPFILTER_RESTORATION = 1 << 2,
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DAV1D_INLOOPFILTER_ALL = DAV1D_INLOOPFILTER_DEBLOCK |
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DAV1D_INLOOPFILTER_CDEF |
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DAV1D_INLOOPFILTER_RESTORATION,
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};
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enum Dav1dDecodeFrameType {
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DAV1D_DECODEFRAMETYPE_ALL = 0, ///< decode and return all frames
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DAV1D_DECODEFRAMETYPE_REFERENCE = 1,///< decode and return frames referenced by other frames only
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DAV1D_DECODEFRAMETYPE_INTRA = 2, ///< decode and return intra frames only (includes keyframes)
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DAV1D_DECODEFRAMETYPE_KEY = 3, ///< decode and return keyframes only
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};
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typedef struct Dav1dSettings {
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int n_threads; ///< number of threads (0 = number of logical cores in host system, default 0)
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int max_frame_delay; ///< Set to 1 for low-latency decoding (0 = ceil(sqrt(n_threads)), default 0)
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int apply_grain; ///< whether to apply film grain on output frames (default 1)
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int operating_point; ///< select an operating point for scalable AV1 bitstreams (0 - 31, default 0)
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int all_layers; ///< output all spatial layers of a scalable AV1 biststream (default 1)
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unsigned frame_size_limit; ///< maximum frame size, in pixels (0 = unlimited, default 0)
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Dav1dPicAllocator allocator; ///< Picture allocator callback.
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Dav1dLogger logger; ///< Logger callback.
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int strict_std_compliance; ///< whether to abort decoding on standard compliance violations
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///< that don't affect actual bitstream decoding (e.g. inconsistent
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///< or invalid metadata, default 0)
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int output_invisible_frames; ///< output invisibly coded frames (in coding order) in addition
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///< to all visible frames. Because of show-existing-frame, this
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///< means some frames may appear twice (once when coded,
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///< once when shown, default 0)
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enum Dav1dInloopFilterType inloop_filters; ///< postfilters to enable during decoding (default
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///< DAV1D_INLOOPFILTER_ALL)
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enum Dav1dDecodeFrameType decode_frame_type; ///< frame types to decode (default
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///< DAV1D_DECODEFRAMETYPE_ALL)
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uint8_t reserved[16]; ///< reserved for future use
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} Dav1dSettings;
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/**
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* Get library version.
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*/
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DAV1D_API const char *dav1d_version(void);
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/**
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* Get library API version.
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*
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* @return A value in the format 0x00XXYYZZ, where XX is the major version,
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* YY the minor version, and ZZ the patch version.
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* @see DAV1D_API_MAJOR, DAV1D_API_MINOR, DAV1D_API_PATCH
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*/
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DAV1D_API unsigned dav1d_version_api(void);
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/**
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* Initialize settings to default values.
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*
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* @param s Input settings context.
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*/
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DAV1D_API void dav1d_default_settings(Dav1dSettings *s);
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/**
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* Allocate and open a decoder instance.
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*
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* @param c_out The decoder instance to open. *c_out will be set to the
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* allocated context.
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* @param s Input settings context.
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*
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* @note The context must be freed using dav1d_close() when decoding is
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* finished.
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*
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* @return 0 on success, or < 0 (a negative DAV1D_ERR code) on error.
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*/
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DAV1D_API int dav1d_open(Dav1dContext **c_out, const Dav1dSettings *s);
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/**
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* Parse a Sequence Header OBU from bitstream data.
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*
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* @param out Output Sequence Header.
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* @param buf The data to be parser.
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* @param sz Size of the data.
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*
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* @return
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* 0: Success, and out is filled with the parsed Sequence Header
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* OBU parameters.
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* DAV1D_ERR(ENOENT): No Sequence Header OBUs were found in the buffer.
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* Other negative DAV1D_ERR codes: Invalid data in the buffer, invalid passed-in
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* arguments, and other errors during parsing.
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*
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* @note It is safe to feed this function data containing other OBUs than a
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* Sequence Header, as they will simply be ignored. If there is more than
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* one Sequence Header OBU present, only the last will be returned.
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*/
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DAV1D_API int dav1d_parse_sequence_header(Dav1dSequenceHeader *out,
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const uint8_t *buf, const size_t sz);
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/**
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* Feed bitstream data to the decoder, in the form of one or multiple AV1
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* Open Bitstream Units (OBUs).
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*
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* @param c Input decoder instance.
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* @param in Input bitstream data. On success, ownership of the reference is
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* passed to the library.
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*
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* @return
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* 0: Success, and the data was consumed.
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* DAV1D_ERR(EAGAIN): The data can't be consumed. dav1d_get_picture() should
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* be called to get one or more frames before the function
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* can consume new data.
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* Other negative DAV1D_ERR codes: Error during decoding or because of invalid
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* passed-in arguments. The reference remains
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* owned by the caller.
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*/
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DAV1D_API int dav1d_send_data(Dav1dContext *c, Dav1dData *in);
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/**
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* Return a decoded picture.
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*
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* @param c Input decoder instance.
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* @param out Output frame. The caller assumes ownership of the returned
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* reference.
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*
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* @return
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* 0: Success, and a frame is returned.
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* DAV1D_ERR(EAGAIN): Not enough data to output a frame. dav1d_send_data()
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* should be called with new input.
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* Other negative DAV1D_ERR codes: Error during decoding or because of invalid
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* passed-in arguments.
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*
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* @note To drain buffered frames from the decoder (i.e. on end of stream),
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* call this function until it returns DAV1D_ERR(EAGAIN).
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*
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* @code{.c}
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* Dav1dData data = { 0 };
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* Dav1dPicture p = { 0 };
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* int res;
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*
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* read_data(&data);
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* do {
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* res = dav1d_send_data(c, &data);
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* // Keep going even if the function can't consume the current data
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* packet. It eventually will after one or more frames have been
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* returned in this loop.
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* if (res < 0 && res != DAV1D_ERR(EAGAIN))
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* free_and_abort();
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* res = dav1d_get_picture(c, &p);
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* if (res < 0) {
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* if (res != DAV1D_ERR(EAGAIN))
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* free_and_abort();
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* } else
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* output_and_unref_picture(&p);
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* // Stay in the loop as long as there's data to consume.
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* } while (data.sz || read_data(&data) == SUCCESS);
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*
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* // Handle EOS by draining all buffered frames.
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* do {
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* res = dav1d_get_picture(c, &p);
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* if (res < 0) {
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* if (res != DAV1D_ERR(EAGAIN))
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* free_and_abort();
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* } else
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* output_and_unref_picture(&p);
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* } while (res == 0);
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* @endcode
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*/
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DAV1D_API int dav1d_get_picture(Dav1dContext *c, Dav1dPicture *out);
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/**
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* Apply film grain to a previously decoded picture. If the picture contains no
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* film grain metadata, then this function merely returns a new reference.
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*
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* @param c Input decoder instance.
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* @param out Output frame. The caller assumes ownership of the returned
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* reference.
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* @param in Input frame. No ownership is transferred.
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*
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* @return
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* 0: Success, and a frame is returned.
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* Other negative DAV1D_ERR codes: Error due to lack of memory or because of
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* invalid passed-in arguments.
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*
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* @note If `Dav1dSettings.apply_grain` is true, film grain was already applied
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* by `dav1d_get_picture`, and so calling this function leads to double
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* application of film grain. Users should only call this when needed.
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*/
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DAV1D_API int dav1d_apply_grain(Dav1dContext *c, Dav1dPicture *out,
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const Dav1dPicture *in);
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/**
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* Close a decoder instance and free all associated memory.
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*
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* @param c_out The decoder instance to close. *c_out will be set to NULL.
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*/
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DAV1D_API void dav1d_close(Dav1dContext **c_out);
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/**
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* Flush all delayed frames in decoder and clear internal decoder state,
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* to be used when seeking.
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*
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* @param c Input decoder instance.
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*
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* @note Decoding will start only after a valid sequence header OBU is
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* delivered to dav1d_send_data().
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*
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*/
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DAV1D_API void dav1d_flush(Dav1dContext *c);
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enum Dav1dEventFlags {
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/**
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* The last returned picture contains a reference to a new Sequence Header,
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* either because it's the start of a new coded sequence, or the decoder was
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* flushed before it was generated.
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*/
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DAV1D_EVENT_FLAG_NEW_SEQUENCE = 1 << 0,
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/**
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* The last returned picture contains a reference to a Sequence Header with
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* new operating parameters information for the current coded sequence.
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*/
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DAV1D_EVENT_FLAG_NEW_OP_PARAMS_INFO = 1 << 1,
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};
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/**
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* Fetch a combination of DAV1D_EVENT_FLAG_* event flags generated by the decoding
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* process.
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*
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* @param c Input decoder instance.
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* @param flags Where to write the flags.
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*
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* @return 0 on success, or < 0 (a negative DAV1D_ERR code) on error.
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*
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* @note Calling this function will clear all the event flags currently stored in
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* the decoder.
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*
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*/
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DAV1D_API int dav1d_get_event_flags(Dav1dContext *c, enum Dav1dEventFlags *flags);
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/**
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* Retrieve the user-provided metadata associated with the input data packet
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* for the last decoding error reported to the user, i.e. a negative return
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* value (not EAGAIN) from dav1d_send_data() or dav1d_get_picture().
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*
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* @param c Input decoder instance.
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* @param out Output Dav1dDataProps. On success, the caller assumes ownership of
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* the returned reference.
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*
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* @return 0 on success, or < 0 (a negative DAV1D_ERR code) on error.
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*/
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DAV1D_API int dav1d_get_decode_error_data_props(Dav1dContext *c, Dav1dDataProps *out);
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/**
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* Get the decoder delay, which is the number of internally buffered frames, not
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* including reference frames.
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* This value is guaranteed to be >= 1 and <= max_frame_delay.
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*
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* @param s Input settings context.
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*
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* @return Decoder frame delay on success, or < 0 (a negative DAV1D_ERR code) on
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* error.
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*
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* @note The returned delay is valid only for a Dav1dContext initialized with the
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* provided Dav1dSettings.
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*/
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DAV1D_API int dav1d_get_frame_delay(const Dav1dSettings *s);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* DAV1D_H */
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