7d09579190
This cap is currently used to mark multithreading-capable codecs that wrap external libraries with their own multithreading code. The name is highly confusing for our API users, since libavcodec ALWAYS handles thread_count=0 (see commit message in previous commit). Therefore rename the cap and update its documentation to make its meaning clear. The old name is kept deprecated until next+1 major bump.
481 lines
17 KiB
C
481 lines
17 KiB
C
/*
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* AVCodec public API
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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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#ifndef AVCODEC_CODEC_H
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#define AVCODEC_CODEC_H
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#include <stdint.h>
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#include "libavutil/avutil.h"
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#include "libavutil/hwcontext.h"
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#include "libavutil/log.h"
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#include "libavutil/pixfmt.h"
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#include "libavutil/rational.h"
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#include "libavutil/samplefmt.h"
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#include "libavcodec/codec_id.h"
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#include "libavcodec/version.h"
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/**
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* @addtogroup lavc_core
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* @{
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*/
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/**
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* Decoder can use draw_horiz_band callback.
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*/
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#define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
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/**
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* Codec uses get_buffer() or get_encode_buffer() for allocating buffers and
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* supports custom allocators.
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* If not set, it might not use get_buffer() or get_encode_buffer() at all, or
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* use operations that assume the buffer was allocated by
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* avcodec_default_get_buffer2 or avcodec_default_get_encode_buffer.
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*/
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#define AV_CODEC_CAP_DR1 (1 << 1)
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#define AV_CODEC_CAP_TRUNCATED (1 << 3)
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/**
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* Encoder or decoder requires flushing with NULL input at the end in order to
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* give the complete and correct output.
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*
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* NOTE: If this flag is not set, the codec is guaranteed to never be fed with
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* with NULL data. The user can still send NULL data to the public encode
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* or decode function, but libavcodec will not pass it along to the codec
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* unless this flag is set.
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*
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* Decoders:
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* The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
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* avpkt->size=0 at the end to get the delayed data until the decoder no longer
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* returns frames.
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*
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* Encoders:
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* The encoder needs to be fed with NULL data at the end of encoding until the
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* encoder no longer returns data.
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*
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* NOTE: For encoders implementing the AVCodec.encode2() function, setting this
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* flag also means that the encoder must set the pts and duration for
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* each output packet. If this flag is not set, the pts and duration will
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* be determined by libavcodec from the input frame.
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*/
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#define AV_CODEC_CAP_DELAY (1 << 5)
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/**
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* Codec can be fed a final frame with a smaller size.
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* This can be used to prevent truncation of the last audio samples.
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*/
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#define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
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/**
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* Codec can output multiple frames per AVPacket
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* Normally demuxers return one frame at a time, demuxers which do not do
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* are connected to a parser to split what they return into proper frames.
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* This flag is reserved to the very rare category of codecs which have a
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* bitstream that cannot be split into frames without timeconsuming
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* operations like full decoding. Demuxers carrying such bitstreams thus
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* may return multiple frames in a packet. This has many disadvantages like
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* prohibiting stream copy in many cases thus it should only be considered
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* as a last resort.
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*/
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#define AV_CODEC_CAP_SUBFRAMES (1 << 8)
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/**
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* Codec is experimental and is thus avoided in favor of non experimental
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* encoders
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*/
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#define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
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/**
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* Codec should fill in channel configuration and samplerate instead of container
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*/
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#define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
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/**
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* Codec supports frame-level multithreading.
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*/
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#define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
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/**
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* Codec supports slice-based (or partition-based) multithreading.
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*/
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#define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
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/**
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* Codec supports changed parameters at any point.
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*/
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#define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
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/**
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* Codec supports multithreading through a method other than slice- or
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* frame-level multithreading. Typically this marks wrappers around
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* multithreading-capable external libraries.
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*/
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#define AV_CODEC_CAP_OTHER_THREADS (1 << 15)
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#if FF_API_AUTO_THREADS
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#define AV_CODEC_CAP_AUTO_THREADS AV_CODEC_CAP_OTHER_THREADS
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#endif
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/**
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* Audio encoder supports receiving a different number of samples in each call.
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*/
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#define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
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/**
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* Decoder is not a preferred choice for probing.
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* This indicates that the decoder is not a good choice for probing.
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* It could for example be an expensive to spin up hardware decoder,
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* or it could simply not provide a lot of useful information about
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* the stream.
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* A decoder marked with this flag should only be used as last resort
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* choice for probing.
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*/
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#define AV_CODEC_CAP_AVOID_PROBING (1 << 17)
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#if FF_API_UNUSED_CODEC_CAPS
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/**
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* Deprecated and unused. Use AVCodecDescriptor.props instead
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*/
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#define AV_CODEC_CAP_INTRA_ONLY 0x40000000
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/**
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* Deprecated and unused. Use AVCodecDescriptor.props instead
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*/
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#define AV_CODEC_CAP_LOSSLESS 0x80000000
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#endif
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/**
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* Codec is backed by a hardware implementation. Typically used to
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* identify a non-hwaccel hardware decoder. For information about hwaccels, use
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* avcodec_get_hw_config() instead.
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*/
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#define AV_CODEC_CAP_HARDWARE (1 << 18)
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/**
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* Codec is potentially backed by a hardware implementation, but not
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* necessarily. This is used instead of AV_CODEC_CAP_HARDWARE, if the
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* implementation provides some sort of internal fallback.
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*/
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#define AV_CODEC_CAP_HYBRID (1 << 19)
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/**
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* This codec takes the reordered_opaque field from input AVFrames
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* and returns it in the corresponding field in AVCodecContext after
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* encoding.
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*/
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#define AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE (1 << 20)
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/**
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* This encoder can be flushed using avcodec_flush_buffers(). If this flag is
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* not set, the encoder must be closed and reopened to ensure that no frames
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* remain pending.
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*/
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#define AV_CODEC_CAP_ENCODER_FLUSH (1 << 21)
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/**
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* AVProfile.
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*/
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typedef struct AVProfile {
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int profile;
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const char *name; ///< short name for the profile
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} AVProfile;
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typedef struct AVCodecDefault AVCodecDefault;
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struct AVCodecContext;
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struct AVSubtitle;
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struct AVPacket;
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/**
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* AVCodec.
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*/
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typedef struct AVCodec {
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/**
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* Name of the codec implementation.
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* The name is globally unique among encoders and among decoders (but an
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* encoder and a decoder can share the same name).
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* This is the primary way to find a codec from the user perspective.
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*/
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const char *name;
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/**
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* Descriptive name for the codec, meant to be more human readable than name.
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* You should use the NULL_IF_CONFIG_SMALL() macro to define it.
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*/
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const char *long_name;
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enum AVMediaType type;
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enum AVCodecID id;
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/**
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* Codec capabilities.
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* see AV_CODEC_CAP_*
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*/
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int capabilities;
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const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
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const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
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const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
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const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
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const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
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uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
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const AVClass *priv_class; ///< AVClass for the private context
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const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
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/**
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* Group name of the codec implementation.
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* This is a short symbolic name of the wrapper backing this codec. A
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* wrapper uses some kind of external implementation for the codec, such
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* as an external library, or a codec implementation provided by the OS or
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* the hardware.
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* If this field is NULL, this is a builtin, libavcodec native codec.
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* If non-NULL, this will be the suffix in AVCodec.name in most cases
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* (usually AVCodec.name will be of the form "<codec_name>_<wrapper_name>").
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*/
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const char *wrapper_name;
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/*****************************************************************
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* No fields below this line are part of the public API. They
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* may not be used outside of libavcodec and can be changed and
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* removed at will.
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* New public fields should be added right above.
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*****************************************************************
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*/
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int priv_data_size;
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#if FF_API_NEXT
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struct AVCodec *next;
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#endif
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/**
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* @name Frame-level threading support functions
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* @{
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*/
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/**
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* Copy necessary context variables from a previous thread context to the current one.
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* If not defined, the next thread will start automatically; otherwise, the codec
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* must call ff_thread_finish_setup().
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*
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* dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
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*/
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int (*update_thread_context)(struct AVCodecContext *dst, const struct AVCodecContext *src);
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/** @} */
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/**
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* Private codec-specific defaults.
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*/
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const AVCodecDefault *defaults;
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/**
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* Initialize codec static data, called from av_codec_iterate().
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*
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* This is not intended for time consuming operations as it is
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* run for every codec regardless of that codec being used.
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*/
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void (*init_static_data)(struct AVCodec *codec);
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int (*init)(struct AVCodecContext *);
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int (*encode_sub)(struct AVCodecContext *, uint8_t *buf, int buf_size,
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const struct AVSubtitle *sub);
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/**
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* Encode data to an AVPacket.
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*
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* @param avctx codec context
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* @param avpkt output AVPacket
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* @param[in] frame AVFrame containing the raw data to be encoded
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* @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
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* non-empty packet was returned in avpkt.
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* @return 0 on success, negative error code on failure
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*/
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int (*encode2)(struct AVCodecContext *avctx, struct AVPacket *avpkt,
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const struct AVFrame *frame, int *got_packet_ptr);
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/**
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* Decode picture or subtitle data.
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*
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* @param avctx codec context
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* @param outdata codec type dependent output struct
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* @param[out] got_frame_ptr decoder sets to 0 or 1 to indicate that a
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* non-empty frame or subtitle was returned in
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* outdata.
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* @param[in] avpkt AVPacket containing the data to be decoded
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* @return amount of bytes read from the packet on success, negative error
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* code on failure
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*/
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int (*decode)(struct AVCodecContext *avctx, void *outdata,
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int *got_frame_ptr, struct AVPacket *avpkt);
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int (*close)(struct AVCodecContext *);
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/**
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* Encode API with decoupled frame/packet dataflow. This function is called
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* to get one output packet. It should call ff_encode_get_frame() to obtain
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* input data.
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*/
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int (*receive_packet)(struct AVCodecContext *avctx, struct AVPacket *avpkt);
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/**
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* Decode API with decoupled packet/frame dataflow. This function is called
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* to get one output frame. It should call ff_decode_get_packet() to obtain
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* input data.
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*/
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int (*receive_frame)(struct AVCodecContext *avctx, struct AVFrame *frame);
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/**
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* Flush buffers.
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* Will be called when seeking
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*/
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void (*flush)(struct AVCodecContext *);
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/**
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* Internal codec capabilities.
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* See FF_CODEC_CAP_* in internal.h
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*/
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int caps_internal;
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/**
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* Decoding only, a comma-separated list of bitstream filters to apply to
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* packets before decoding.
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*/
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const char *bsfs;
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/**
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* Array of pointers to hardware configurations supported by the codec,
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* or NULL if no hardware supported. The array is terminated by a NULL
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* pointer.
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*
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* The user can only access this field via avcodec_get_hw_config().
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*/
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const struct AVCodecHWConfigInternal *const *hw_configs;
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/**
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* List of supported codec_tags, terminated by FF_CODEC_TAGS_END.
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*/
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const uint32_t *codec_tags;
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} AVCodec;
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/**
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* Iterate over all registered codecs.
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*
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* @param opaque a pointer where libavcodec will store the iteration state. Must
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* point to NULL to start the iteration.
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*
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* @return the next registered codec or NULL when the iteration is
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* finished
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*/
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const AVCodec *av_codec_iterate(void **opaque);
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/**
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* Find a registered decoder with a matching codec ID.
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*
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* @param id AVCodecID of the requested decoder
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* @return A decoder if one was found, NULL otherwise.
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*/
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AVCodec *avcodec_find_decoder(enum AVCodecID id);
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/**
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* Find a registered decoder with the specified name.
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*
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* @param name name of the requested decoder
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* @return A decoder if one was found, NULL otherwise.
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*/
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AVCodec *avcodec_find_decoder_by_name(const char *name);
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/**
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* Find a registered encoder with a matching codec ID.
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*
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* @param id AVCodecID of the requested encoder
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* @return An encoder if one was found, NULL otherwise.
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*/
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AVCodec *avcodec_find_encoder(enum AVCodecID id);
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/**
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* Find a registered encoder with the specified name.
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*
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* @param name name of the requested encoder
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* @return An encoder if one was found, NULL otherwise.
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*/
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AVCodec *avcodec_find_encoder_by_name(const char *name);
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/**
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* @return a non-zero number if codec is an encoder, zero otherwise
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*/
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int av_codec_is_encoder(const AVCodec *codec);
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/**
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* @return a non-zero number if codec is a decoder, zero otherwise
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*/
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int av_codec_is_decoder(const AVCodec *codec);
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enum {
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/**
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* The codec supports this format via the hw_device_ctx interface.
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*
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* When selecting this format, AVCodecContext.hw_device_ctx should
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* have been set to a device of the specified type before calling
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* avcodec_open2().
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*/
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AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX = 0x01,
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/**
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* The codec supports this format via the hw_frames_ctx interface.
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*
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* When selecting this format for a decoder,
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* AVCodecContext.hw_frames_ctx should be set to a suitable frames
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* context inside the get_format() callback. The frames context
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* must have been created on a device of the specified type.
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*
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* When selecting this format for an encoder,
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* AVCodecContext.hw_frames_ctx should be set to the context which
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* will be used for the input frames before calling avcodec_open2().
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*/
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AV_CODEC_HW_CONFIG_METHOD_HW_FRAMES_CTX = 0x02,
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/**
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* The codec supports this format by some internal method.
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*
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* This format can be selected without any additional configuration -
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* no device or frames context is required.
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*/
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AV_CODEC_HW_CONFIG_METHOD_INTERNAL = 0x04,
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/**
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* The codec supports this format by some ad-hoc method.
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*
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* Additional settings and/or function calls are required. See the
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* codec-specific documentation for details. (Methods requiring
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* this sort of configuration are deprecated and others should be
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* used in preference.)
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*/
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AV_CODEC_HW_CONFIG_METHOD_AD_HOC = 0x08,
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};
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typedef struct AVCodecHWConfig {
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/**
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* For decoders, a hardware pixel format which that decoder may be
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* able to decode to if suitable hardware is available.
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*
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* For encoders, a pixel format which the encoder may be able to
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* accept. If set to AV_PIX_FMT_NONE, this applies to all pixel
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* formats supported by the codec.
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*/
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enum AVPixelFormat pix_fmt;
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/**
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* Bit set of AV_CODEC_HW_CONFIG_METHOD_* flags, describing the possible
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* setup methods which can be used with this configuration.
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*/
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int methods;
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/**
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* The device type associated with the configuration.
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*
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* Must be set for AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX and
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* AV_CODEC_HW_CONFIG_METHOD_HW_FRAMES_CTX, otherwise unused.
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*/
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enum AVHWDeviceType device_type;
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} AVCodecHWConfig;
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/**
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* Retrieve supported hardware configurations for a codec.
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*
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* Values of index from zero to some maximum return the indexed configuration
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* descriptor; all other values return NULL. If the codec does not support
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* any hardware configurations then it will always return NULL.
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*/
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const AVCodecHWConfig *avcodec_get_hw_config(const AVCodec *codec, int index);
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/**
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* @}
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*/
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#endif /* AVCODEC_CODEC_H */
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