403 lines
13 KiB
C
403 lines
13 KiB
C
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/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* common internal api header.
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*/
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#ifndef AVCODEC_INTERNAL_H
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#define AVCODEC_INTERNAL_H
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#include <stdint.h>
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#include "libavutil/buffer.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/pixfmt.h"
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#include "avcodec.h"
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#include "config.h"
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/**
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* The codec does not modify any global variables in the init function,
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* allowing to call the init function without locking any global mutexes.
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*/
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#define FF_CODEC_CAP_INIT_THREADSAFE (1 << 0)
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/**
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* The codec allows calling the close function for deallocation even if
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* the init function returned a failure. Without this capability flag, a
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* codec does such cleanup internally when returning failures from the
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* init function and does not expect the close function to be called at
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* all.
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*/
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#define FF_CODEC_CAP_INIT_CLEANUP (1 << 1)
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/**
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* Decoders marked with FF_CODEC_CAP_SETS_PKT_DTS want to set
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* AVFrame.pkt_dts manually. If the flag is set, decode.c won't overwrite
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* this field. If it's unset, decode.c tries to guess the pkt_dts field
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* from the input AVPacket.
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*/
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#define FF_CODEC_CAP_SETS_PKT_DTS (1 << 2)
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/**
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* The decoder extracts and fills its parameters even if the frame is
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* skipped due to the skip_frame setting.
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*/
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#define FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM (1 << 3)
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/**
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* The decoder sets the cropping fields in the output frames manually.
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* If this cap is set, the generic code will initialize output frame
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* dimensions to coded rather than display values.
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*/
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#define FF_CODEC_CAP_EXPORTS_CROPPING (1 << 4)
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/**
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* Codec initializes slice-based threading with a main function
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*/
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#define FF_CODEC_CAP_SLICE_THREAD_HAS_MF (1 << 5)
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/*
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* The codec supports frame threading and has inter-frame dependencies, so it
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* uses ff_thread_report/await_progress().
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*/
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#define FF_CODEC_CAP_ALLOCATE_PROGRESS (1 << 6)
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/**
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* AVCodec.codec_tags termination value
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*/
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#define FF_CODEC_TAGS_END -1
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#ifdef TRACE
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# define ff_tlog(ctx, ...) av_log(ctx, AV_LOG_TRACE, __VA_ARGS__)
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#else
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# define ff_tlog(ctx, ...) do { } while(0)
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#endif
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#define FF_DEFAULT_QUANT_BIAS 999999
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#define FF_QSCALE_TYPE_MPEG1 0
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#define FF_QSCALE_TYPE_MPEG2 1
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#define FF_QSCALE_TYPE_H264 2
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#define FF_QSCALE_TYPE_VP56 3
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#define FF_SANE_NB_CHANNELS 512U
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#define FF_SIGNBIT(x) ((x) >> CHAR_BIT * sizeof(x) - 1)
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#if HAVE_SIMD_ALIGN_64
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# define STRIDE_ALIGN 64 /* AVX-512 */
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#elif HAVE_SIMD_ALIGN_32
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# define STRIDE_ALIGN 32
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#elif HAVE_SIMD_ALIGN_16
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# define STRIDE_ALIGN 16
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#else
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# define STRIDE_ALIGN 8
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#endif
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typedef struct DecodeSimpleContext {
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AVPacket *in_pkt;
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AVFrame *out_frame;
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} DecodeSimpleContext;
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typedef struct AVCodecInternal {
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/**
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* Whether the parent AVCodecContext is a copy of the context which had
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* init() called on it.
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* This is used by multithreading - shared tables and picture pointers
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* should be freed from the original context only.
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*/
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int is_copy;
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/**
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* An audio frame with less than required samples has been submitted and
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* padded with silence. Reject all subsequent frames.
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*/
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int last_audio_frame;
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AVFrame *to_free;
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AVBufferRef *pool;
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void *thread_ctx;
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DecodeSimpleContext ds;
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AVBSFContext *bsf;
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/**
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* Properties (timestamps+side data) extracted from the last packet passed
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* for decoding.
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*/
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AVPacket *last_pkt_props;
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/**
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* temporary buffer used for encoders to store their bitstream
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*/
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uint8_t *byte_buffer;
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unsigned int byte_buffer_size;
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void *frame_thread_encoder;
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/**
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* Number of audio samples to skip at the start of the next decoded frame
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*/
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int skip_samples;
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/**
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* hwaccel-specific private data
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*/
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void *hwaccel_priv_data;
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/**
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* checks API usage: after codec draining, flush is required to resume operation
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*/
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int draining;
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/**
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* buffers for using new encode/decode API through legacy API
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*/
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AVPacket *buffer_pkt;
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int buffer_pkt_valid; // encoding: packet without data can be valid
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AVFrame *buffer_frame;
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int draining_done;
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int compat_decode_warned;
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/* this variable is set by the decoder internals to signal to the old
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* API compat wrappers the amount of data consumed from the last packet */
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size_t compat_decode_consumed;
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/* when a partial packet has been consumed, this stores the remaining size
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* of the packet (that should be submitted in the next decode call */
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size_t compat_decode_partial_size;
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AVFrame *compat_decode_frame;
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int showed_multi_packet_warning;
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int skip_samples_multiplier;
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/* to prevent infinite loop on errors when draining */
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int nb_draining_errors;
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/* used when avctx flag AV_CODEC_FLAG_DROPCHANGED is set */
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int changed_frames_dropped;
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int initial_format;
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int initial_width, initial_height;
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int initial_sample_rate;
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int initial_channels;
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uint64_t initial_channel_layout;
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} AVCodecInternal;
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struct AVCodecDefault {
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const uint8_t *key;
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const uint8_t *value;
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};
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extern const uint8_t ff_log2_run[41];
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/**
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* Return the index into tab at which {a,b} match elements {[0],[1]} of tab.
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* If there is no such matching pair then size is returned.
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*/
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int ff_match_2uint16(const uint16_t (*tab)[2], int size, int a, int b);
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unsigned int avpriv_toupper4(unsigned int x);
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void ff_color_frame(AVFrame *frame, const int color[4]);
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/**
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* Maximum size in bytes of extradata.
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* This value was chosen such that every bit of the buffer is
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* addressable by a 32-bit signed integer as used by get_bits.
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*/
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#define FF_MAX_EXTRADATA_SIZE ((1 << 28) - AV_INPUT_BUFFER_PADDING_SIZE)
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/**
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* Check AVPacket size and/or allocate data.
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*
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* Encoders supporting AVCodec.encode2() can use this as a convenience to
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* ensure the output packet data is large enough, whether provided by the user
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* or allocated in this function.
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*
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* @param avctx the AVCodecContext of the encoder
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* @param avpkt the AVPacket
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* If avpkt->data is already set, avpkt->size is checked
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* to ensure it is large enough.
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* If avpkt->data is NULL, a new buffer is allocated.
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* avpkt->size is set to the specified size.
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* All other AVPacket fields will be reset with av_init_packet().
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* @param size the minimum required packet size
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* @param min_size This is a hint to the allocation algorithm, which indicates
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* to what minimal size the caller might later shrink the packet
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* to. Encoders often allocate packets which are larger than the
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* amount of data that is written into them as the exact amount is
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* not known at the time of allocation. min_size represents the
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* size a packet might be shrunk to by the caller. Can be set to
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* 0. setting this roughly correctly allows the allocation code
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* to choose between several allocation strategies to improve
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* speed slightly.
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* @return non negative on success, negative error code on failure
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*/
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int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size);
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/**
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* Rescale from sample rate to AVCodecContext.time_base.
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*/
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static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx,
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int64_t samples)
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{
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if(samples == AV_NOPTS_VALUE)
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return AV_NOPTS_VALUE;
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return av_rescale_q(samples, (AVRational){ 1, avctx->sample_rate },
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avctx->time_base);
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}
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/**
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* 2^(x) for integer x
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* @return correctly rounded float
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*/
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static av_always_inline float ff_exp2fi(int x) {
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/* Normal range */
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if (-126 <= x && x <= 128)
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return av_int2float((x+127) << 23);
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/* Too large */
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else if (x > 128)
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return INFINITY;
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/* Subnormal numbers */
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else if (x > -150)
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return av_int2float(1 << (x+149));
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/* Negligibly small */
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else
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return 0;
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}
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/**
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* Get a buffer for a frame. This is a wrapper around
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* AVCodecContext.get_buffer() and should be used instead calling get_buffer()
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* directly.
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*/
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int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags);
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#define FF_REGET_BUFFER_FLAG_READONLY 1 ///< the returned buffer does not need to be writable
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/**
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* Identical in function to ff_get_buffer(), except it reuses the existing buffer
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* if available.
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*/
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int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags);
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int ff_thread_can_start_frame(AVCodecContext *avctx);
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int avpriv_h264_has_num_reorder_frames(AVCodecContext *avctx);
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/**
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* Call avcodec_open2 recursively by decrementing counter, unlocking mutex,
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* calling the function and then restoring again. Assumes the mutex is
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* already locked
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*/
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int ff_codec_open2_recursive(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
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/**
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* Finalize buf into extradata and set its size appropriately.
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*/
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int avpriv_bprint_to_extradata(AVCodecContext *avctx, struct AVBPrint *buf);
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const uint8_t *avpriv_find_start_code(const uint8_t *p,
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const uint8_t *end,
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uint32_t *state);
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int avpriv_codec_get_cap_skip_frame_fill_param(const AVCodec *codec);
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/**
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* Check that the provided frame dimensions are valid and set them on the codec
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* context.
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*/
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int ff_set_dimensions(AVCodecContext *s, int width, int height);
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/**
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* Check that the provided sample aspect ratio is valid and set it on the codec
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* context.
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*/
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int ff_set_sar(AVCodecContext *avctx, AVRational sar);
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/**
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* Add or update AV_FRAME_DATA_MATRIXENCODING side data.
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*/
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int ff_side_data_update_matrix_encoding(AVFrame *frame,
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enum AVMatrixEncoding matrix_encoding);
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/**
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* Select the (possibly hardware accelerated) pixel format.
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* This is a wrapper around AVCodecContext.get_format() and should be used
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* instead of calling get_format() directly.
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*
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* The list of pixel formats must contain at least one valid entry, and is
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* terminated with AV_PIX_FMT_NONE. If it is possible to decode to software,
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* the last entry in the list must be the most accurate software format.
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* If it is not possible to decode to software, AVCodecContext.sw_pix_fmt
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* must be set before calling this function.
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*/
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int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt);
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/**
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* Set various frame properties from the codec context / packet data.
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*/
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int ff_decode_frame_props(AVCodecContext *avctx, AVFrame *frame);
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/**
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* Add a CPB properties side data to an encoding context.
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*/
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AVCPBProperties *ff_add_cpb_side_data(AVCodecContext *avctx);
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/**
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* Check AVFrame for A53 side data and allocate and fill SEI message with A53 info
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*
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* @param frame Raw frame to get A53 side data from
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* @param prefix_len Number of bytes to allocate before SEI message
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* @param data Pointer to a variable to store allocated memory
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* Upon return the variable will hold NULL on error or if frame has no A53 info.
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* Otherwise it will point to prefix_len uninitialized bytes followed by
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* *sei_size SEI message
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* @param sei_size Pointer to a variable to store generated SEI message length
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* @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);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Check if a value is in the list. If not, return the default value
|
||
|
|
*
|
||
|
|
* @param ctx Context for the log msg
|
||
|
|
* @param val_name Name of the checked value, for log msg
|
||
|
|
* @param array_valid_values Array of valid int, ended with INT_MAX
|
||
|
|
* @param default_value Value return if checked value is not in the array
|
||
|
|
* @return Value or default_value.
|
||
|
|
*/
|
||
|
|
int ff_int_from_list_or_default(void *ctx, const char * val_name, int val,
|
||
|
|
const int * array_valid_values, int default_value);
|
||
|
|
|
||
|
|
void ff_dvdsub_parse_palette(uint32_t *palette, const char *p);
|
||
|
|
|
||
|
|
#if defined(_WIN32) && CONFIG_SHARED && !defined(BUILDING_avcodec)
|
||
|
|
# define av_export_avcodec __declspec(dllimport)
|
||
|
|
#else
|
||
|
|
# define av_export_avcodec
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* AVCODEC_INTERNAL_H */
|