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Diffstat (limited to 'libavresample/avresample.h')
| -rw-r--r-- | libavresample/avresample.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/libavresample/avresample.h b/libavresample/avresample.h index 0012787404..d26f2ca223 100644 --- a/libavresample/avresample.h +++ b/libavresample/avresample.h @@ -259,6 +259,36 @@ int avresample_set_matrix(AVAudioResampleContext *avr, const double *matrix, int stride); /** + * Set a customized input channel mapping. + * + * This function can only be called when the allocated context is not open. + * Also, the input channel layout must have already been set. + * + * Calling avresample_close() on the context will clear the channel mapping. + * + * The map for each input channel specifies the channel index in the source to + * use for that particular channel, or -1 to mute the channel. Source channels + * can be duplicated by using the same index for multiple input channels. + * + * Examples: + * + * Reordering 5.1 AAC order (C,L,R,Ls,Rs,LFE) to Libav order (L,R,C,LFE,Ls,Rs): + * { 1, 2, 0, 5, 3, 4 } + * + * Muting the 3rd channel in 4-channel input: + * { 0, 1, -1, 3 } + * + * Duplicating the left channel of stereo input: + * { 0, 0 } + * + * @param avr audio resample context + * @param channel_map customized input channel mapping + * @return 0 on success, negative AVERROR code on failure + */ +int avresample_set_channel_mapping(AVAudioResampleContext *avr, + const int *channel_map); + +/** * Set compensation for resampling. * * This can be called anytime after avresample_open(). If resampling is not |