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+/*
+ * 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
+ */
+
+#ifndef AVCODEC_CODEC_INTERNAL_H
+#define AVCODEC_CODEC_INTERNAL_H
+
+#include <stdint.h>
+
+#include "libavutil/attributes.h"
+#include "codec.h"
+#include "config.h"
+
+/**
+ * The codec is not known to be init-threadsafe (i.e. it might be unsafe
+ * to initialize this codec and another codec concurrently, typically because
+ * the codec calls external APIs that are not known to be thread-safe).
+ * Therefore calling the codec's init function needs to be guarded with a lock.
+ */
+#define FF_CODEC_CAP_NOT_INIT_THREADSAFE (1 << 0)
+/**
+ * The codec allows calling the close function for deallocation even if
+ * the init function returned a failure. Without this capability flag, a
+ * codec does such cleanup internally when returning failures from the
+ * init function and does not expect the close function to be called at
+ * all.
+ */
+#define FF_CODEC_CAP_INIT_CLEANUP (1 << 1)
+/**
+ * Decoders marked with FF_CODEC_CAP_SETS_PKT_DTS want to set
+ * AVFrame.pkt_dts manually. If the flag is set, decode.c won't overwrite
+ * this field. If it's unset, decode.c tries to guess the pkt_dts field
+ * from the input AVPacket.
+ */
+#define FF_CODEC_CAP_SETS_PKT_DTS (1 << 2)
+/**
+ * The decoder extracts and fills its parameters even if the frame is
+ * skipped due to the skip_frame setting.
+ */
+#define FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM (1 << 3)
+/**
+ * The decoder sets the cropping fields in the output frames manually.
+ * If this cap is set, the generic code will initialize output frame
+ * dimensions to coded rather than display values.
+ */
+#define FF_CODEC_CAP_EXPORTS_CROPPING (1 << 4)
+/**
+ * Codec initializes slice-based threading with a main function
+ */
+#define FF_CODEC_CAP_SLICE_THREAD_HAS_MF (1 << 5)
+/*
+ * The codec supports frame threading and has inter-frame dependencies, so it
+ * uses ff_thread_report/await_progress().
+ */
+#define FF_CODEC_CAP_ALLOCATE_PROGRESS (1 << 6)
+/**
+ * Codec handles avctx->thread_count == 0 (auto) internally.
+ */
+#define FF_CODEC_CAP_AUTO_THREADS (1 << 7)
+/**
+ * Codec handles output frame properties internally instead of letting the
+ * internal logic derive them from AVCodecInternal.last_pkt_props.
+ */
+#define FF_CODEC_CAP_SETS_FRAME_PROPS (1 << 8)
+/**
+ * Codec supports embedded ICC profiles (AV_FRAME_DATA_ICC_PROFILE).
+ */
+#define FF_CODEC_CAP_ICC_PROFILES (1 << 9)
+/**
+ * The encoder has AV_CODEC_CAP_DELAY set, but does not actually have delay - it
+ * only wants to be flushed at the end to update some context variables (e.g.
+ * 2pass stats) or produce a trailing packet. Besides that it immediately
+ * produces exactly one output packet per each input frame, just as no-delay
+ * encoders do.
+ */
+#define FF_CODEC_CAP_EOF_FLUSH (1 << 10)
+
+/**
+ * FFCodec.codec_tags termination value
+ */
+#define FF_CODEC_TAGS_END -1
+
+typedef struct FFCodecDefault {
+ const char *key;
+ const char *value;
+} FFCodecDefault;
+
+struct AVCodecContext;
+struct AVSubtitle;
+struct AVPacket;
+
+enum FFCodecType {
+ /* The codec is a decoder using the decode callback;
+ * audio and video codecs only. */
+ FF_CODEC_CB_TYPE_DECODE,
+ /* The codec is a decoder using the decode_sub callback;
+ * subtitle codecs only. */
+ FF_CODEC_CB_TYPE_DECODE_SUB,
+ /* The codec is a decoder using the receive_frame callback;
+ * audio and video codecs only. */
+ FF_CODEC_CB_TYPE_RECEIVE_FRAME,
+ /* The codec is an encoder using the encode callback;
+ * audio and video codecs only. */
+ FF_CODEC_CB_TYPE_ENCODE,
+ /* The codec is an encoder using the encode_sub callback;
+ * subtitle codecs only. */
+ FF_CODEC_CB_TYPE_ENCODE_SUB,
+ /* The codec is an encoder using the receive_packet callback;
+ * audio and video codecs only. */
+ FF_CODEC_CB_TYPE_RECEIVE_PACKET,
+};
+
+typedef struct FFCodec {
+ /**
+ * The public AVCodec. See codec.h for it.
+ */
+ AVCodec p;
+
+ /**
+ * Internal codec capabilities FF_CODEC_CAP_*.
+ */
+ unsigned caps_internal:29;
+
+ /**
+ * This field determines the type of the codec (decoder/encoder)
+ * and also the exact callback cb implemented by the codec.
+ * cb_type uses enum FFCodecType values.
+ */
+ unsigned cb_type:3;
+
+ int priv_data_size;
+ /**
+ * @name Frame-level threading support functions
+ * @{
+ */
+ /**
+ * Copy necessary context variables from a previous thread context to the current one.
+ * If not defined, the next thread will start automatically; otherwise, the codec
+ * must call ff_thread_finish_setup().
+ *
+ * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
+ */
+ int (*update_thread_context)(struct AVCodecContext *dst, const struct AVCodecContext *src);
+
+ /**
+ * Copy variables back to the user-facing context
+ */
+ int (*update_thread_context_for_user)(struct AVCodecContext *dst, const struct AVCodecContext *src);
+ /** @} */
+
+ /**
+ * Private codec-specific defaults.
+ */
+ const FFCodecDefault *defaults;
+
+ /**
+ * Initialize codec static data, called from av_codec_iterate().
+ *
+ * This is not intended for time consuming operations as it is
+ * run for every codec regardless of that codec being used.
+ */
+ void (*init_static_data)(struct FFCodec *codec);
+
+ int (*init)(struct AVCodecContext *);
+
+ union {
+ /**
+ * Decode to an AVFrame.
+ * cb is in this state if cb_type is FF_CODEC_CB_TYPE_DECODE.
+ *
+ * @param avctx codec context
+ * @param[out] frame AVFrame for output
+ * @param[out] got_frame_ptr decoder sets to 0 or 1 to indicate that
+ * a non-empty frame was returned in frame.
+ * @param[in] avpkt AVPacket containing the data to be decoded
+ * @return amount of bytes read from the packet on success,
+ * negative error code on failure
+ */
+ int (*decode)(struct AVCodecContext *avctx, struct AVFrame *frame,
+ int *got_frame_ptr, struct AVPacket *avpkt);
+ /**
+ * Decode subtitle data to an AVSubtitle.
+ * cb is in this state if cb_type is FF_CODEC_CB_TYPE_DECODE_SUB.
+ *
+ * Apart from that this is like the decode callback.
+ */
+ int (*decode_sub)(struct AVCodecContext *avctx, struct AVSubtitle *sub,
+ int *got_frame_ptr, const struct AVPacket *avpkt);
+ /**
+ * Decode API with decoupled packet/frame dataflow.
+ * cb is in this state if cb_type is FF_CODEC_CB_TYPE_RECEIVE_FRAME.
+ *
+ * This function is called to get one output frame. It should call
+ * ff_decode_get_packet() to obtain input data.
+ */
+ int (*receive_frame)(struct AVCodecContext *avctx, struct AVFrame *frame);
+ /**
+ * Encode data to an AVPacket.
+ * cb is in this state if cb_type is FF_CODEC_CB_TYPE_ENCODE
+ *
+ * @param avctx codec context
+ * @param[out] avpkt output AVPacket
+ * @param[in] frame AVFrame containing the input to be encoded
+ * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
+ * non-empty packet was returned in avpkt.
+ * @return 0 on success, negative error code on failure
+ */
+ int (*encode)(struct AVCodecContext *avctx, struct AVPacket *avpkt,
+ const struct AVFrame *frame, int *got_packet_ptr);
+ /**
+ * Encode subtitles to a raw buffer.
+ * cb is in this state if cb_type is FF_CODEC_CB_TYPE_ENCODE_SUB.
+ */
+ int (*encode_sub)(struct AVCodecContext *avctx, uint8_t *buf,
+ int buf_size, const struct AVSubtitle *sub);
+ /**
+ * Encode API with decoupled frame/packet dataflow.
+ * cb is in this state if cb_type is FF_CODEC_CB_TYPE_RECEIVE_PACKET.
+ *
+ * This function is called to get one output packet.
+ * It should call ff_encode_get_frame() to obtain input data.
+ */
+ int (*receive_packet)(struct AVCodecContext *avctx, struct AVPacket *avpkt);
+ } cb;
+
+ int (*close)(struct AVCodecContext *);
+
+ /**
+ * Flush buffers.
+ * Will be called when seeking
+ */
+ void (*flush)(struct AVCodecContext *);
+
+ /**
+ * Decoding only, a comma-separated list of bitstream filters to apply to
+ * packets before decoding.
+ */
+ const char *bsfs;
+
+ /**
+ * Array of pointers to hardware configurations supported by the codec,
+ * or NULL if no hardware supported. The array is terminated by a NULL
+ * pointer.
+ *
+ * The user can only access this field via avcodec_get_hw_config().
+ */
+ const struct AVCodecHWConfigInternal *const *hw_configs;
+
+ /**
+ * List of supported codec_tags, terminated by FF_CODEC_TAGS_END.
+ */
+ const uint32_t *codec_tags;
+} FFCodec;
+
+#if CONFIG_SMALL
+#define CODEC_LONG_NAME(str) .p.long_name = NULL
+#else
+#define CODEC_LONG_NAME(str) .p.long_name = str
+#endif
+
+#if HAVE_THREADS
+#define UPDATE_THREAD_CONTEXT(func) \
+ .update_thread_context = (func)
+#define UPDATE_THREAD_CONTEXT_FOR_USER(func) \
+ .update_thread_context_for_user = (func)
+#else
+#define UPDATE_THREAD_CONTEXT(func) \
+ .update_thread_context = NULL
+#define UPDATE_THREAD_CONTEXT_FOR_USER(func) \
+ .update_thread_context_for_user = NULL
+#endif
+
+#if FF_API_OLD_CHANNEL_LAYOUT
+#define CODEC_OLD_CHANNEL_LAYOUTS(...) CODEC_OLD_CHANNEL_LAYOUTS_ARRAY(((const uint64_t[]) { __VA_ARGS__, 0 }))
+#if defined(__clang__)
+#define CODEC_OLD_CHANNEL_LAYOUTS_ARRAY(array) \
+ FF_DISABLE_DEPRECATION_WARNINGS \
+ .p.channel_layouts = (array), \
+ FF_ENABLE_DEPRECATION_WARNINGS
+#else
+#define CODEC_OLD_CHANNEL_LAYOUTS_ARRAY(array) .p.channel_layouts = (array),
+#endif
+#else
+/* This is only provided to allow to test disabling FF_API_OLD_CHANNEL_LAYOUT
+ * without removing all the FF_API_OLD_CHANNEL_LAYOUT codeblocks.
+ * It is of course still expected to be removed when FF_API_OLD_CHANNEL_LAYOUT
+ * will be finally removed (along with all usages of these macros). */
+#define CODEC_OLD_CHANNEL_LAYOUTS(...)
+#define CODEC_OLD_CHANNEL_LAYOUTS_ARRAY(array)
+#endif
+
+#define FF_CODEC_DECODE_CB(func) \
+ .cb_type = FF_CODEC_CB_TYPE_DECODE, \
+ .cb.decode = (func)
+#define FF_CODEC_DECODE_SUB_CB(func) \
+ .cb_type = FF_CODEC_CB_TYPE_DECODE_SUB, \
+ .cb.decode_sub = (func)
+#define FF_CODEC_RECEIVE_FRAME_CB(func) \
+ .cb_type = FF_CODEC_CB_TYPE_RECEIVE_FRAME, \
+ .cb.receive_frame = (func)
+#define FF_CODEC_ENCODE_CB(func) \
+ .cb_type = FF_CODEC_CB_TYPE_ENCODE, \
+ .cb.encode = (func)
+#define FF_CODEC_ENCODE_SUB_CB(func) \
+ .cb_type = FF_CODEC_CB_TYPE_ENCODE_SUB, \
+ .cb.encode_sub = (func)
+#define FF_CODEC_RECEIVE_PACKET_CB(func) \
+ .cb_type = FF_CODEC_CB_TYPE_RECEIVE_PACKET, \
+ .cb.receive_packet = (func)
+
+static av_always_inline const FFCodec *ffcodec(const AVCodec *codec)
+{
+ return (const FFCodec*)codec;
+}
+
+#endif /* AVCODEC_CODEC_INTERNAL_H */