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129 lines
3.8 KiB
129 lines
3.8 KiB
2 years ago
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/*
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* Codec descriptors 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_DESC_H
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#define AVCODEC_CODEC_DESC_H
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#include "libavutil/avutil.h"
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#include "codec_id.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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* This struct describes the properties of a single codec described by an
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* AVCodecID.
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* @see avcodec_descriptor_get()
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*/
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typedef struct AVCodecDescriptor {
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enum AVCodecID id;
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enum AVMediaType type;
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/**
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* Name of the codec described by this descriptor. It is non-empty and
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* unique for each codec descriptor. It should contain alphanumeric
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* characters and '_' only.
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*/
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const char *name;
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/**
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* A more descriptive name for this codec. May be NULL.
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*/
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const char *long_name;
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/**
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* Codec properties, a combination of AV_CODEC_PROP_* flags.
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*/
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int props;
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/**
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* MIME type(s) associated with the codec.
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* May be NULL; if not, a NULL-terminated array of MIME types.
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* The first item is always non-NULL and is the preferred MIME type.
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*/
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const char *const *mime_types;
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/**
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* If non-NULL, an array of profiles recognized for this codec.
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* Terminated with FF_PROFILE_UNKNOWN.
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*/
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const struct AVProfile *profiles;
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} AVCodecDescriptor;
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/**
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* Codec uses only intra compression.
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* Video and audio codecs only.
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*/
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#define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
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/**
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* Codec supports lossy compression. Audio and video codecs only.
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* @note a codec may support both lossy and lossless
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* compression modes
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*/
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#define AV_CODEC_PROP_LOSSY (1 << 1)
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/**
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* Codec supports lossless compression. Audio and video codecs only.
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*/
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#define AV_CODEC_PROP_LOSSLESS (1 << 2)
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/**
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* Codec supports frame reordering. That is, the coded order (the order in which
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* the encoded packets are output by the encoders / stored / input to the
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* decoders) may be different from the presentation order of the corresponding
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* frames.
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*
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* For codecs that do not have this property set, PTS and DTS should always be
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* equal.
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*/
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#define AV_CODEC_PROP_REORDER (1 << 3)
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/**
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* Subtitle codec is bitmap based
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* Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
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*/
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#define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
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/**
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* Subtitle codec is text based.
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* Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
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*/
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#define AV_CODEC_PROP_TEXT_SUB (1 << 17)
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/**
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* @return descriptor for given codec ID or NULL if no descriptor exists.
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*/
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const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
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/**
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* Iterate over all codec descriptors known to libavcodec.
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*
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* @param prev previous descriptor. NULL to get the first descriptor.
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*
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* @return next descriptor or NULL after the last descriptor
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*/
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const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
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/**
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* @return codec descriptor with the given name or NULL if no such descriptor
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* exists.
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*/
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const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
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/**
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* @}
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*/
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#endif // AVCODEC_CODEC_DESC_H
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