diff options
Diffstat (limited to 'cras/src/server/cras_fmt_conv_ops.c')
| -rw-r--r-- | cras/src/server/cras_fmt_conv_ops.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/cras/src/server/cras_fmt_conv_ops.c b/cras/src/server/cras_fmt_conv_ops.c index a306d216..adc55215 100644 --- a/cras/src/server/cras_fmt_conv_ops.c +++ b/cras/src/server/cras_fmt_conv_ops.c @@ -223,6 +223,44 @@ size_t s16_stereo_to_51(size_t left, size_t right, size_t center, } /* + * Channel converter: quad to 5.1 surround. + * + * Fit the front left/right of input to the front left/right of output + * and rear left/right of input to the rear left/right of output + * respectively and fill others with zero. + */ +size_t s16_quad_to_51(size_t font_left, size_t front_right, size_t rear_left, + size_t rear_right, const uint8_t *_in, size_t in_frames, + uint8_t *_out) +{ + size_t i; + const int16_t *in = (const int16_t *)_in; + int16_t *out = (int16_t *)_out; + + memset(out, 0, sizeof(*out) * 6 * in_frames); + + if (font_left != -1 && front_right != -1 && rear_left != -1 && + rear_right != -1) + for (i = 0; i < in_frames; i++) { + out[6 * i + font_left] = in[4 * i]; + out[6 * i + front_right] = in[4 * i + 1]; + out[6 * i + rear_left] = in[4 * i + 2]; + out[6 * i + rear_right] = in[4 * i + 3]; + } + else + /* Use default 5.1 channel mapping for the conversion. + */ + for (i = 0; i < in_frames; i++) { + out[6 * i] = in[4 * i]; + out[6 * i + 1] = in[4 * i + 1]; + out[6 * i + 4] = in[4 * i + 2]; + out[6 * i + 5] = in[4 * i + 3]; + } + + return in_frames; +} + +/* * Channel converter: 5.1 surround to stereo. * * The out buffer can have room for just stereo samples. This convert function |