# avcodec_audio_channel_layout.h
## Overview
The **avcodec_audio_channel_layout.h** file declares the enums used for audio codec.
**Since**
9
**Related Modules**
[AudioDecoder](_audio_decoder.md)
## Summary
### Enums
| Name| Description|
| -------- | -------- |
| [OHOS::Media::AudioChannelSet](_audio_decoder.md#audiochannelset) : uint64_t {
**FRONT_LEFT** = 1ULL << 0U,
**FRONT_RIGHT** = 1ULL << 1U,
**FRONT_CENTER** = 1ULL << 2U,
**LOW_FREQUENCY** = 1ULL << 3U,
**BACK_LEFT** = 1ULL << 4U,
**BACK_RIGHT** = 1ULL << 5U,
**FRONT_LEFT_OF_CENTER** = 1ULL << 6U,
**FRONT_RIGHT_OF_CENTER** = 1ULL << 7U,
**BACK_CENTER** = 1ULL << 8U,
**SIDE_LEFT** = 1ULL << 9U,
**SIDE_RIGHT** = 1ULL << 10U,
**TOP_CENTER** = 1ULL << 11U,
**TOP_FRONT_LEFT** = 1ULL << 12U,
**TOP_FRONT_CENTER** = 1ULL << 13U,
**TOP_FRONT_RIGHT** = 1ULL << 14U,
**TOP_BACK_LEFT** = 1ULL << 15U,
**TOP_BACK_CENTER** = 1ULL << 16U,
**TOP_BACK_RIGHT** = 1ULL << 17U,
**STEREO_LEFT** = 1ULL << 29U,
**STEREO_RIGHT** = 1ULL << 30U,
**WIDE_LEFT** = 1ULL << 31U,
**WIDE_RIGHT** = 1ULL << 32U,
**SURROUND_DIRECT_LEFT** = 1ULL << 33U,
**SURROUND_DIRECT_RIGHT** = 1ULL << 34U,
**LOW_FREQUENCY_2** = 1ULL << 35U,
**TOP_SIDE_LEFT** = 1ULL << 36U,
**TOP_SIDE_RIGHT** = 1ULL << 37U,
**BOTTOM_FRONT_CENTER** = 1ULL << 38U,
**BOTTOM_FRONT_LEFT** = 1ULL << 39U,
**BOTTOM_FRONT_RIGHT** = 1ULL << 40U,
**AMBISONICS_ACN0** = 1ULL << 41U,
**AMBISONICS_ACN1** = 1ULL << 42U,
**AMBISONICS_ACN2** = 1ULL << 43U,
**AMBISONICS_ACN3** = 1ULL << 44U,
**AMBISONICS_W** = AMBISONICS_ACN0,
**AMBISONICS_Y** = AMBISONICS_ACN1,
**AMBISONICS_Z** = AMBISONICS_ACN2,
**AMBISONICS_X** = AMBISONICS_ACN3,
**AMBISONICS_ACN4** = 1ULL << 45U,
**AMBISONICS_ACN5** = 1ULL << 46U,
**AMBISONICS_ACN6** = 1ULL << 47U,
**AMBISONICS_ACN7** = 1ULL << 48U,
**AMBISONICS_ACN8** = 1ULL << 49U,
**AMBISONICS_ACN9** = 1ULL << 50U,
**AMBISONICS_ACN10** = 1ULL << 51U,
**AMBISONICS_ACN11** = 1ULL << 52U,
**AMBISONICS_ACN12** = 1ULL << 53U,
**AMBISONICS_ACN13** = 1ULL << 54U,
**AMBISONICS_ACN14** = 1ULL << 55U,
**AMBISONICS_ACN15** = 1ULL << 56U
} | Enumerates the audio channel numbers. Each channel number is mapped to a variable of int64.|
| [OHOS::Media::AudioChannelLayout](_audio_decoder.md#audiochannellayout) : uint64_t {
**UNKNOWN_CHANNEL_LAYOUT** = 0,
**MONO** = (AudioChannelSet::FRONT_CENTER),
**STEREO** = (AudioChannelSet::FRONT_LEFT \| AudioChannelSet::FRONT_RIGHT),
**CH_2POINT1** = (STEREO \| AudioChannelSet::LOW_FREQUENCY),
**CH_2_1** = (STEREO \| AudioChannelSet::BACK_CENTER),
**SURROUND** = (STEREO \| AudioChannelSet::FRONT_CENTER),
**CH_3POINT1** = (SURROUND \| AudioChannelSet::LOW_FREQUENCY),
**CH_4POINT0** = (SURROUND \| AudioChannelSet::BACK_CENTER),
**CH_4POINT1** = (CH_4POINT0 \| AudioChannelSet::LOW_FREQUENCY),
**CH_2_2** = (STEREO \| AudioChannelSet::SIDE_LEFT \| AudioChannelSet::SIDE_RIGHT),
**QUAD** = (STEREO \| AudioChannelSet::BACK_LEFT \| AudioChannelSet::BACK_RIGHT),
**CH_5POINT0** = (SURROUND \| AudioChannelSet::SIDE_LEFT \| AudioChannelSet::SIDE_RIGHT),
**CH_5POINT1** = (CH_5POINT0 \| AudioChannelSet::LOW_FREQUENCY),
**CH_5POINT0_BACK** = (SURROUND \| AudioChannelSet::BACK_LEFT \| AudioChannelSet::BACK_RIGHT),
**CH_5POINT1_BACK** = (CH_5POINT0_BACK \| AudioChannelSet::LOW_FREQUENCY),
**CH_6POINT0** = (CH_5POINT0 \| AudioChannelSet::BACK_CENTER),
**CH_6POINT0_FRONT** = (CH_2_2 \| AudioChannelSet::FRONT_LEFT_OF_CENTER \|
AudioChannelSet::FRONT_RIGHT_OF_CENTER),
**HEXAGONAL** = (CH_5POINT0_BACK \| AudioChannelSet::BACK_CENTER),
**CH_6POINT1** = (CH_5POINT1 \| AudioChannelSet::BACK_CENTER),
**CH_6POINT1_BACK** = (CH_5POINT1_BACK \| AudioChannelSet::BACK_CENTER),
**CH_6POINT1_FRONT** = (CH_6POINT0_FRONT \| AudioChannelSet::LOW_FREQUENCY),
**CH_7POINT0** = (CH_5POINT0 \| AudioChannelSet::BACK_LEFT \| AudioChannelSet::BACK_RIGHT),
**CH_7POINT0_FRONT** = (CH_5POINT0 \| AudioChannelSet::FRONT_LEFT_OF_CENTER \|
AudioChannelSet::FRONT_RIGHT_OF_CENTER),
**CH_7POINT1** = (CH_5POINT1 \| AudioChannelSet::BACK_LEFT \| AudioChannelSet::BACK_RIGHT),
**CH_7POINT1_WIDE** = (CH_5POINT1 \| AudioChannelSet::FRONT_LEFT_OF_CENTER \|
AudioChannelSet::FRONT_RIGHT_OF_CENTER),
**CH_7POINT1_WIDE_BACK** = (CH_5POINT1_BACK \| AudioChannelSet::FRONT_LEFT_OF_CENTER \| AudioChannelSet::FRONT_RIGHT_OF_CENTER),
**CH_3POINT1POINT2** = (CH_3POINT1 \| AudioChannelSet::TOP_FRONT_LEFT \|
AudioChannelSet::TOP_FRONT_RIGHT),
**CH_5POINT1POINT2** = (CH_5POINT1 \| AudioChannelSet::TOP_SIDE_LEFT \|
AudioChannelSet::TOP_SIDE_RIGHT),
**CH_5POINT1POINT4** = (CH_5POINT1 \| AudioChannelSet::TOP_FRONT_LEFT \|
AudioChannelSet::TOP_FRONT_RIGHT
\| AudioChannelSet::TOP_BACK_LEFT \| AudioChannelSet::TOP_BACK_RIGHT),
**CH_7POINT1POINT2** = (CH_7POINT1 \| AudioChannelSet::TOP_SIDE_LEFT \|
AudioChannelSet::TOP_SIDE_RIGHT),
**CH_7POINT1POINT4** = (CH_7POINT1 \| AudioChannelSet::TOP_FRONT_LEFT \|
AudioChannelSet::TOP_FRONT_RIGHT
\| AudioChannelSet::TOP_BACK_LEFT \| AudioChannelSet::TOP_BACK_RIGHT),
**CH_9POINT1POINT4** = (CH_7POINT1POINT4 \| AudioChannelSet::WIDE_LEFT \|
AudioChannelSet::WIDE_RIGHT),
**CH_9POINT1POINT6** = (CH_9POINT1POINT4 \| AudioChannelSet::TOP_SIDE_LEFT \|
AudioChannelSet::TOP_SIDE_RIGHT),
**CH_10POINT2** = (AudioChannelSet::FRONT_LEFT \| AudioChannelSet::FRONT_RIGHT \|
AudioChannelSet::FRONT_CENTER \|
AudioChannelSet::TOP_FRONT_LEFT \| AudioChannelSet::TOP_FRONT_RIGHT \| AudioChannelSet::BACK_LEFT \|
AudioChannelSet::BACK_RIGHT \| AudioChannelSet::BACK_CENTER \| AudioChannelSet::SIDE_LEFT \|
AudioChannelSet::SIDE_RIGHT \| AudioChannelSet::WIDE_LEFT \| AudioChannelSet::WIDE_RIGHT),
**CH_22POINT2** = (CH_7POINT1POINT4 \| AudioChannelSet::FRONT_LEFT_OF_CENTER \|
AudioChannelSet::FRONT_RIGHT_OF_CENTER \| AudioChannelSet::BACK_CENTER \|
AudioChannelSet::TOP_CENTER \|
AudioChannelSet::TOP_FRONT_CENTER \|, AudioChannelSet::TOP_BACK_CENTER \|
AudioChannelSet::TOP_SIDE_LEFT \|
AudioChannelSet::TOP_SIDE_RIGHT \|AudioChannelSet::BOTTOM_FRONT_LEFT \|
AudioChannelSet::BOTTOM_FRONT_RIGHT
\|AudioChannelSet::BOTTOM_FRONT_CENTER \| AudioChannelSet::LOW_FREQUENCY_2),
**OCTAGONAL** = (CH_5POINT0 \| AudioChannelSet::BACK_LEFT \| AudioChannelSet::BACK_CENTER \|
AudioChannelSet::BACK_RIGHT),
**HEXADECAGONAL** = (OCTAGONAL \| AudioChannelSet::WIDE_LEFT \| AudioChannelSet::WIDE_RIGHT \|
AudioChannelSet::TOP_BACK_LEFT \| AudioChannelSet::TOP_BACK_RIGHT \|
AudioChannelSet::TOP_BACK_CENTER \|
AudioChannelSet::TOP_FRONT_CENTER \| AudioChannelSet::TOP_FRONT_LEFT \|
AudioChannelSet::TOP_FRONT_RIGHT),
**STEREO_DOWNMIX** = (AudioChannelSet::STEREO_LEFT \| AudioChannelSet::STEREO_RIGHT),
**HOA_FIRST** = AudioChannelSet::AMBISONICS_ACN0 \| AudioChannelSet::AMBISONICS_ACN1 \|
AudioChannelSet::AMBISONICS_ACN2 \|AudioChannelSet::AMBISONICS_ACN3,
**HOA_SECOND** = HOA_FIRST \| AudioChannelSet::AMBISONICS_ACN4 \| AudioChannelSet::AMBISONICS_ACN5 \|
AudioChannelSet::AMBISONICS_ACN6 \| AudioChannelSet::AMBISONICS_ACN7 \|
AudioChannelSet::AMBISONICS_ACN8,
**HOA_THIRD** = HOA_SECOND \| AudioChannelSet::AMBISONICS_ACN9 \|
AudioChannelSet::AMBISONICS_ACN10 \|
AudioChannelSet::AMBISONICS_ACN11 \| AudioChannelSet::AMBISONICS_ACN12 \|
AudioChannelSet::AMBISONICS_ACN13 \| AudioChannelSet::AMBISONICS_ACN14
\|AudioChannelSet::AMBISONICS_ACN15
} | Enumerates the types of the audio channel numbers. The output format of the decoder is represented as the channel type of the codec.|