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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
+ */
+
+/**
+ * @file
+ * common internal api header.
+ */
+
+#ifndef AVCODEC_INTERNAL_H
+#define AVCODEC_INTERNAL_H
+
+#include <stdint.h>
+
+#include "libavutil/buffer.h"
+#include "libavutil/channel_layout.h"
+#include "libavutil/mathematics.h"
+#include "libavutil/pixfmt.h"
+#include "avcodec.h"
+#include "config.h"
+
+/**
+ * The codec does not modify any global variables in the init function,
+ * allowing to call the init function without locking any global mutexes.
+ */
+#define FF_CODEC_CAP_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, utils.c won't overwrite
+ * this field. If it's unset, utils.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)
+
+#ifdef TRACE
+# define ff_tlog(ctx, ...) av_log(ctx, AV_LOG_TRACE, __VA_ARGS__)
+#else
+# define ff_tlog(ctx, ...) do { } while(0)
+#endif
+
+
+#if !FF_API_QUANT_BIAS
+#define FF_DEFAULT_QUANT_BIAS 999999
+#endif
+
+#define FF_SANE_NB_CHANNELS 64U
+
+#define FF_SIGNBIT(x) ((x) >> CHAR_BIT * sizeof(x) - 1)
+
+#if HAVE_AVX
+# define STRIDE_ALIGN 32
+#elif HAVE_SIMD_ALIGN_16
+# define STRIDE_ALIGN 16
+#else
+# define STRIDE_ALIGN 8
+#endif
+
+typedef struct FramePool {
+ /**
+ * Pools for each data plane. For audio all the planes have the same size,
+ * so only pools[0] is used.
+ */
+ AVBufferPool *pools[4];
+
+ /*
+ * Pool parameters
+ */
+ int format;
+ int width, height;
+ int stride_align[AV_NUM_DATA_POINTERS];
+ int linesize[4];
+ int planes;
+ int channels;
+ int samples;
+} FramePool;
+
+typedef struct AVCodecInternal {
+ /**
+ * Whether the parent AVCodecContext is a copy of the context which had
+ * init() called on it.
+ * This is used by multithreading - shared tables and picture pointers
+ * should be freed from the original context only.
+ */
+ int is_copy;
+
+ /**
+ * Whether to allocate progress for frame threading.
+ *
+ * The codec must set it to 1 if it uses ff_thread_await/report_progress(),
+ * then progress will be allocated in ff_thread_get_buffer(). The frames
+ * then MUST be freed with ff_thread_release_buffer().
+ *
+ * If the codec does not need to call the progress functions (there are no
+ * dependencies between the frames), it should leave this at 0. Then it can
+ * decode straight to the user-provided frames (which the user will then
+ * free with av_frame_unref()), there is no need to call
+ * ff_thread_release_buffer().
+ */
+ int allocate_progress;
+
+ /**
+ * An audio frame with less than required samples has been submitted and
+ * padded with silence. Reject all subsequent frames.
+ */
+ int last_audio_frame;
+
+ AVFrame *to_free;
+
+ FramePool *pool;
+
+ void *thread_ctx;
+
+ /**
+ * Current packet as passed into the decoder, to avoid having to pass the
+ * packet into every function.
+ */
+ AVPacket *pkt;
+
+ /**
+ * temporary buffer used for encoders to store their bitstream
+ */
+ uint8_t *byte_buffer;
+ unsigned int byte_buffer_size;
+
+ void *frame_thread_encoder;
+
+ /**
+ * Number of audio samples to skip at the start of the next decoded frame
+ */
+ int skip_samples;
+
+ /**
+ * hwaccel-specific private data
+ */
+ void *hwaccel_priv_data;
+
+ /**
+ * checks API usage: after codec draining, flush is required to resume operation
+ */
+ int draining;
+
+ /**
+ * buffers for using new encode/decode API through legacy API
+ */
+ AVPacket *buffer_pkt;
+ int buffer_pkt_valid; // encoding: packet without data can be valid
+ AVFrame *buffer_frame;
+ int draining_done;
+} AVCodecInternal;
+
+struct AVCodecDefault {
+ const uint8_t *key;
+ const uint8_t *value;
+};
+
+extern const uint8_t ff_log2_run[41];
+
+/**
+ * Return the index into tab at which {a,b} match elements {[0],[1]} of tab.
+ * If there is no such matching pair then size is returned.
+ */
+int ff_match_2uint16(const uint16_t (*tab)[2], int size, int a, int b);
+
+unsigned int avpriv_toupper4(unsigned int x);
+
+/**
+ * does needed setup of pkt_pts/pos and such for (re)get_buffer();
+ */
+int ff_init_buffer_info(AVCodecContext *s, AVFrame *frame);
+
+
+void ff_color_frame(AVFrame *frame, const int color[4]);
+
+extern volatile int ff_avcodec_locked;
+int ff_lock_avcodec(AVCodecContext *log_ctx, const AVCodec *codec);
+int ff_unlock_avcodec(const AVCodec *codec);
+
+int avpriv_lock_avformat(void);
+int avpriv_unlock_avformat(void);
+
+/**
+ * Maximum size in bytes of extradata.
+ * This value was chosen such that every bit of the buffer is
+ * addressable by a 32-bit signed integer as used by get_bits.
+ */
+#define FF_MAX_EXTRADATA_SIZE ((1 << 28) - AV_INPUT_BUFFER_PADDING_SIZE)
+
+/**
+ * Check AVPacket size and/or allocate data.
+ *
+ * Encoders supporting AVCodec.encode2() can use this as a convenience to
+ * ensure the output packet data is large enough, whether provided by the user
+ * or allocated in this function.
+ *
+ * @param avctx the AVCodecContext of the encoder
+ * @param avpkt the AVPacket
+ * If avpkt->data is already set, avpkt->size is checked
+ * to ensure it is large enough.
+ * If avpkt->data is NULL, a new buffer is allocated.
+ * avpkt->size is set to the specified size.
+ * All other AVPacket fields will be reset with av_init_packet().
+ * @param size the minimum required packet size
+ * @param min_size This is a hint to the allocation algorithm, which indicates
+ * to what minimal size the caller might later shrink the packet
+ * to. Encoders often allocate packets which are larger than the
+ * amount of data that is written into them as the exact amount is
+ * not known at the time of allocation. min_size represents the
+ * size a packet might be shrunk to by the caller. Can be set to
+ * 0. setting this roughly correctly allows the allocation code
+ * to choose between several allocation strategies to improve
+ * speed slightly.
+ * @return non negative on success, negative error code on failure
+ */
+int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size);
+
+attribute_deprecated int ff_alloc_packet(AVPacket *avpkt, int size);
+
+/**
+ * Rescale from sample rate to AVCodecContext.time_base.
+ */
+static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx,
+ int64_t samples)
+{
+ if(samples == AV_NOPTS_VALUE)
+ return AV_NOPTS_VALUE;
+ return av_rescale_q(samples, (AVRational){ 1, avctx->sample_rate },
+ avctx->time_base);
+}
+
+/**
+ * 2^(x) for integer x
+ * @return correctly rounded float
+ */
+static av_always_inline float ff_exp2fi(int x) {
+ /* Normal range */
+ if (-126 <= x && x <= 128)
+ return av_int2float(x+127 << 23);
+ /* Too large */
+ else if (x > 128)
+ return INFINITY;
+ /* Subnormal numbers */
+ else if (x > -150)
+ return av_int2float(1 << (x+149));
+ /* Negligibly small */
+ else
+ return 0;
+}
+
+/**
+ * Get a buffer for a frame. This is a wrapper around
+ * AVCodecContext.get_buffer() and should be used instead calling get_buffer()
+ * directly.
+ */
+int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags);
+
+/**
+ * Identical in function to av_frame_make_writable(), except it uses
+ * ff_get_buffer() to allocate the buffer when needed.
+ */
+int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame);
+
+int ff_thread_can_start_frame(AVCodecContext *avctx);
+
+int avpriv_h264_has_num_reorder_frames(AVCodecContext *avctx);
+
+/**
+ * Call avcodec_open2 recursively by decrementing counter, unlocking mutex,
+ * calling the function and then restoring again. Assumes the mutex is
+ * already locked
+ */
+int ff_codec_open2_recursive(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
+
+/**
+ * Finalize buf into extradata and set its size appropriately.
+ */
+int avpriv_bprint_to_extradata(AVCodecContext *avctx, struct AVBPrint *buf);
+
+const uint8_t *avpriv_find_start_code(const uint8_t *p,
+ const uint8_t *end,
+ uint32_t *state);
+
+int avpriv_codec_get_cap_skip_frame_fill_param(const AVCodec *codec);
+
+/**
+ * Check that the provided frame dimensions are valid and set them on the codec
+ * context.
+ */
+int ff_set_dimensions(AVCodecContext *s, int width, int height);
+
+/**
+ * Check that the provided sample aspect ratio is valid and set it on the codec
+ * context.
+ */
+int ff_set_sar(AVCodecContext *avctx, AVRational sar);
+
+/**
+ * Add or update AV_FRAME_DATA_MATRIXENCODING side data.
+ */
+int ff_side_data_update_matrix_encoding(AVFrame *frame,
+ enum AVMatrixEncoding matrix_encoding);
+
+/**
+ * Select the (possibly hardware accelerated) pixel format.
+ * This is a wrapper around AVCodecContext.get_format() and should be used
+ * instead of calling get_format() directly.
+ */
+int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt);
+
+/**
+ * Set various frame properties from the codec context / packet data.
+ */
+int ff_decode_frame_props(AVCodecContext *avctx, AVFrame *frame);
+
+/**
+ * Add a CPB properties side data to an encoding context.
+ */
+AVCPBProperties *ff_add_cpb_side_data(AVCodecContext *avctx);
+
+int ff_side_data_set_encoder_stats(AVPacket *pkt, int quality, int64_t *error, int error_count, int pict_type);
+
+/**
+ * Check AVFrame for A53 side data and allocate and fill SEI message with A53 info
+ *
+ * @param frame Raw frame to get A53 side data from
+ * @param prefix_len Number of bytes to allocate before SEI message
+ * @param data Pointer to a variable to store allocated memory
+ * Upon return the variable will hold NULL on error or if frame has no A53 info.
+ * Otherwise it will point to prefix_len uninitialized bytes followed by
+ * *sei_size SEI message
+ * @param sei_size Pointer to a variable to store generated SEI message length
+ * @return Zero on success, negative error code on failure
+ */
+int ff_alloc_a53_sei(const AVFrame *frame, size_t prefix_len,
+ void **data, size_t *sei_size);
+
+#endif /* AVCODEC_INTERNAL_H */