This struct describes the properties of an encoded stream.
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#include <libavcodec/avcodec.h>
This struct describes the properties of an encoded stream.
sizeof(AVCodecParameters) is not a part of the public ABI, this struct must be allocated with avcodec_parameters_alloc() and freed with avcodec_parameters_free().
- Examples:
- remuxing.c.
Definition at line 3949 of file avcodec.h.
◆ codec_type
◆ codec_id
◆ codec_tag
| uint32_t AVCodecParameters::codec_tag |
Additional information about the codec (corresponds to the AVI FOURCC).
- Examples:
- remuxing.c.
Definition at line 3961 of file avcodec.h.
Referenced by main().
◆ extradata
| uint8_t* AVCodecParameters::extradata |
Extra binary data needed for initializing the decoder, codec-dependent.
Must be allocated with av_malloc() and will be freed by avcodec_parameters_free(). The allocated size of extradata must be at least extradata_size + AV_INPUT_BUFFER_PADDING_SIZE, with the padding bytes zeroed.
Definition at line 3971 of file avcodec.h.
◆ extradata_size
| int AVCodecParameters::extradata_size |
Size of the extradata content in bytes.
Definition at line 3975 of file avcodec.h.
◆ format
| int AVCodecParameters::format |
- video: the pixel format, the value corresponds to enum AVPixelFormat.
- audio: the sample format, the value corresponds to enum AVSampleFormat.
Definition at line 3981 of file avcodec.h.
◆ bit_rate
| int64_t AVCodecParameters::bit_rate |
The average bitrate of the encoded data (in bits per second).
Definition at line 3986 of file avcodec.h.
◆ bits_per_coded_sample
| int AVCodecParameters::bits_per_coded_sample |
The number of bits per sample in the codedwords.
This is basically the bitrate per sample. It is mandatory for a bunch of formats to actually decode them. It's the number of bits for one sample in the actual coded bitstream.
This could be for example 4 for ADPCM For PCM formats this matches bits_per_raw_sample Can be 0
Definition at line 3999 of file avcodec.h.
◆ bits_per_raw_sample
| int AVCodecParameters::bits_per_raw_sample |
This is the number of valid bits in each output sample.
If the sample format has more bits, the least significant bits are additional padding bits, which are always 0. Use right shifts to reduce the sample to its actual size. For example, audio formats with 24 bit samples will have bits_per_raw_sample set to 24, and format set to AV_SAMPLE_FMT_S32. To get the original sample use "(int32_t)sample >> 8"."
For ADPCM this might be 12 or 16 or similar Can be 0
Definition at line 4012 of file avcodec.h.
◆ profile
| int AVCodecParameters::profile |
Codec-specific bitstream restrictions that the stream conforms to.
Definition at line 4017 of file avcodec.h.
◆ level
| int AVCodecParameters::level |
◆ width
| int AVCodecParameters::width |
Video only.
The dimensions of the video frame in pixels.
Definition at line 4023 of file avcodec.h.
◆ height
| int AVCodecParameters::height |
◆ sample_aspect_ratio
Video only.
The aspect ratio (width / height) which a single pixel should have when displayed.
When the aspect ratio is unknown / undefined, the numerator should be set to 0 (the denominator may have any value).
Definition at line 4033 of file avcodec.h.
◆ field_order
Video only.
The order of the fields in interlaced video.
Definition at line 4038 of file avcodec.h.
◆ color_range
Video only.
Additional colorspace characteristics.
Definition at line 4043 of file avcodec.h.
◆ color_primaries
◆ color_trc
◆ color_space
◆ chroma_location
◆ video_delay
| int AVCodecParameters::video_delay |
Video only.
Number of delayed frames.
Definition at line 4052 of file avcodec.h.
◆ channel_layout
| uint64_t AVCodecParameters::channel_layout |
Audio only.
The channel layout bitmask. May be 0 if the channel layout is unknown or unspecified, otherwise the number of bits set must be equal to the channels field.
Definition at line 4059 of file avcodec.h.
◆ channels
| int AVCodecParameters::channels |
Audio only.
The number of audio channels.
Definition at line 4063 of file avcodec.h.
◆ sample_rate
| int AVCodecParameters::sample_rate |
Audio only.
The number of audio samples per second.
Definition at line 4067 of file avcodec.h.
◆ block_align
| int AVCodecParameters::block_align |
Audio only.
The number of bytes per coded audio frame, required by some formats.
Corresponds to nBlockAlign in WAVEFORMATEX.
Definition at line 4074 of file avcodec.h.
◆ frame_size
| int AVCodecParameters::frame_size |
Audio only.
Audio frame size, if known. Required by some formats to be static.
Definition at line 4078 of file avcodec.h.
◆ initial_padding
| int AVCodecParameters::initial_padding |
Audio only.
The amount of padding (in samples) inserted by the encoder at the beginning of the audio. I.e. this number of leading decoded samples must be discarded by the caller to get the original audio without leading padding.
Definition at line 4086 of file avcodec.h.
◆ trailing_padding
| int AVCodecParameters::trailing_padding |
Audio only.
The amount of padding (in samples) appended by the encoder to the end of the audio. I.e. this number of decoded samples must be discarded by the caller from the end of the stream to get the original audio without any trailing padding.
Definition at line 4093 of file avcodec.h.
◆ seek_preroll
| int AVCodecParameters::seek_preroll |
Audio only.
Number of samples to skip after a discontinuity.
Definition at line 4097 of file avcodec.h.
The documentation for this struct was generated from the following file:
