diff options
Diffstat (limited to 'libswresample/swresample.h')
| -rw-r--r-- | libswresample/swresample.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/libswresample/swresample.h b/libswresample/swresample.h index a09563b80a..a8db5c2490 100644 --- a/libswresample/swresample.h +++ b/libswresample/swresample.h @@ -120,6 +120,7 @@ */ #include <stdint.h> +#include "libavutil/channel_layout.h" #include "libavutil/frame.h" #include "libavutil/samplefmt.h" @@ -366,6 +367,36 @@ int swr_set_compensation(struct SwrContext *s, int sample_delta, int compensatio int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map); /** + * Generate a channel mixing matrix. + * + * This function is the one used internally by libswresample for building the + * default mixing matrix. It is made public just as a utility function for + * building custom matrices. + * + * @param in_layout input channel layout + * @param out_layout output channel layout + * @param center_mix_level mix level for the center channel + * @param surround_mix_level mix level for the surround channel(s) + * @param lfe_mix_level mix level for the low-frequency effects channel + * @param rematrix_maxval if 1.0, coefficients will be normalized to prevent + * overflow. if INT_MAX, coefficients will not be + * normalized. + * @param[out] matrix mixing coefficients; matrix[i + stride * o] is + * the weight of input channel i in output channel o. + * @param stride distance between adjacent input channels in the + * matrix array + * @param matrix_encoding matrixed stereo downmix mode (e.g. dplii) + * @param log_ctx parent logging context, can be NULL + * @return 0 on success, negative AVERROR code on failure + */ +int swr_build_matrix(uint64_t in_layout, uint64_t out_layout, + double center_mix_level, double surround_mix_level, + double lfe_mix_level, double rematrix_maxval, + double rematrix_volume, double *matrix, + int stride, enum AVMatrixEncoding matrix_encoding, + void *log_ctx); + +/** * Set a customized remix matrix. * * @param s allocated Swr context, not yet initialized |