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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"
#if CONFIG_LCMS2
# include "fflcms2.h"
#endif
#define FF_SANE_NB_CHANNELS 512U
#if HAVE_SIMD_ALIGN_64
# define STRIDE_ALIGN 64 /* AVX-512 */
#elif HAVE_SIMD_ALIGN_32
# define STRIDE_ALIGN 32
#elif HAVE_SIMD_ALIGN_16
# define STRIDE_ALIGN 16
#else
# define STRIDE_ALIGN 8
#endif
typedef struct AVCodecInternal {
/**
* When using frame-threaded decoding, this field is set for the first
* worker thread (e.g. to decode extradata just once).
*/
int is_copy;
/**
* Audio encoders can set this flag during init to indicate that they
* want the small last frame to be padded to a multiple of pad_samples.
*/
int pad_samples;
AVBufferRef *pool;
void *thread_ctx;
/**
* This packet is used to hold the packet given to decoders
* implementing the .decode API; it is unused by the generic
* code for decoders implementing the .receive_frame API and
* may be freely used (but not freed) by them with the caveat
* that the packet will be unreferenced generically in
* avcodec_flush_buffers().
*/
AVPacket *in_pkt;
struct AVBSFContext *bsf;
/**
* Properties (timestamps+side data) extracted from the last packet passed
* for decoding.
*/
AVPacket *last_pkt_props;
/**
* temporary buffer used for encoders to store their bitstream
*/
uint8_t *byte_buffer;
unsigned int byte_buffer_size;
void *frame_thread_encoder;
/**
* The input frame is stored here for encoders implementing the simple
* encode API.
*
* Not allocated in other cases.
*/
AVFrame *in_frame;
/**
* When the AV_CODEC_FLAG_RECON_FRAME flag is used. the encoder should store
* here the reconstructed frame corresponding to the last returned packet.
*
* Not allocated in other cases.
*/
AVFrame *recon_frame;
/**
* If this is set, then FFCodec->close (if existing) needs to be called
* for the parent AVCodecContext.
*/
int needs_close;
/**
* 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;
/**
* Temporary buffers for newly received or not yet output packets/frames.
*/
AVPacket *buffer_pkt;
AVFrame *buffer_frame;
int draining_done;
#if FF_API_DROPCHANGED
/* used when avctx flag AV_CODEC_FLAG_DROPCHANGED is set */
int changed_frames_dropped;
int initial_format;
int initial_width, initial_height;
int initial_sample_rate;
AVChannelLayout initial_ch_layout;
#endif
#if CONFIG_LCMS2
FFIccContext icc; /* used to read and write embedded ICC profiles */
#endif
} AVCodecInternal;
/**
* 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 ff_toupper4(unsigned int x);
/**
* 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;
}
int avpriv_h264_has_num_reorder_frames(AVCodecContext *avctx);
int avpriv_codec_get_cap_skip_frame_fill_param(const AVCodec *codec);
/**
* Add a CPB properties side data to an encoding context.
*/
AVCPBProperties *ff_add_cpb_side_data(AVCodecContext *avctx);
/**
* Check AVFrame for S12M timecode side data and allocate and fill TC SEI message with timecode info
*
* @param frame Raw frame to get S12M timecode side data from
* @param rate The frame rate
* @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 S12M timecode 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_timecode_sei(const AVFrame *frame, AVRational rate, size_t prefix_len,
void **data, size_t *sei_size);
/**
* Get an estimated video bitrate based on frame size, frame rate and coded
* bits per pixel.
*/
int64_t ff_guess_coded_bitrate(AVCodecContext *avctx);
#endif /* AVCODEC_INTERNAL_H */
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