/*
* 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, 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)
#ifdef TRACE
# define ff_tlog(ctx, ...) av_log(ctx, AV_LOG_TRACE, __VA_ARGS__)
#else
# define ff_tlog(ctx, ...) do { } while(0)
#endif
#define FF_DEFAULT_QUANT_BIAS 999999
#define FF_QSCALE_TYPE_MPEG1 0
#define FF_QSCALE_TYPE_MPEG2 1
#define FF_QSCALE_TYPE_H264 2
#define FF_QSCALE_TYPE_VP56 3
#define FF_SANE_NB_CHANNELS 64U
#define FF_SIGNBIT(x) ((x) >> CHAR_BIT * sizeof(x) - 1)
#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 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 DecodeSimpleContext {
AVPacket *in_pkt;
AVFrame *out_frame;
} DecodeSimpleContext;
typedef struct DecodeFilterContext {
AVBSFContext **bsfs;
int nb_bsfs;
} DecodeFilterContext;
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;
DecodeSimpleContext ds;
DecodeFilterContext filter;
/**
* 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;
/**
* 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;
/* set to 1 when the caller is using the old decoding API */
int compat_decode;
int compat_decode_warned;
/* this variable is set by the decoder internals to signal to the old
* API compat wrappers the amount of data consumed from the last packet */
size_t compat_decode_consumed;
/* when a partial packet has been consumed, this stores the remaining size
* of the packet (that should be submitted in the next decode call */
size_t compat_decode_partial_size;
AVFrame *compat_decode_frame;
int showed_multi_packet_warning;
int skip_samples_multiplier;
/* to prevent infinite loop on errors when draining */
int nb_draining_errors;
} 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);
void ff_color_frame(AVFrame *frame, const int color[4]);
/**
* 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.
*
* The list of pixel formats must contain at least one valid entry, and is
* terminated with AV_PIX_FMT_NONE. If it is possible to decode to software,
* the last entry in the list must be the most accurate software format.
* If it is not possible to decode to software, AVCodecContext.sw_pix_fmt
* must be set before calling this function.
*/
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);
/**
* Get an estimated video bitrate based on frame size, frame rate and coded
* bits per pixel.
*/
int64_t ff_guess_coded_bitrate(AVCodecContext *avctx);
#if defined(_WIN32) && CONFIG_SHARED && !defined(BUILDING_avcodec)
# define av_export_avcodec __declspec(dllimport)
#else
# define av_export_avcodec
#endif
#endif /* AVCODEC_INTERNAL_H */