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| author | Peter D'Hoye <peter.dhoye@gmail.com> | 2008-10-08 22:18:16 +0000 |
|---|---|---|
| committer | Peter D'Hoye <peter.dhoye@gmail.com> | 2008-10-08 22:18:16 +0000 |
| commit | 528fe442fc6e6e077172b2e8a3b586a3ce96d16b (patch) | |
| tree | 4985fe6f102727419862cf58bcb5aa8a7d736f11 /apps/codecs/aiff_enc.c | |
| parent | cb1173cedd4eb1c8648420a3926a591995390537 (diff) | |
New recording setting to configure how mono recordings are made. Previously, this was always L+R, which was kinda silly if your signal was on L only. This setting allows for L, R or L+R. SWCODEC only for now, to be added for HWCODEC (although that will only be L and L+R probably)
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18745 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/codecs/aiff_enc.c')
| -rw-r--r-- | apps/codecs/aiff_enc.c | 43 |
1 files changed, 33 insertions, 10 deletions
diff --git a/apps/codecs/aiff_enc.c b/apps/codecs/aiff_enc.c index 7e085d5721..78c25b8711 100644 --- a/apps/codecs/aiff_enc.c +++ b/apps/codecs/aiff_enc.c @@ -72,6 +72,7 @@ struct aiff_header aiff_header = /* (*) updated when finalizing file */ static int num_channels IBSS_ATTR; +static int rec_mono_mode IBSS_ATTR; static uint32_t sample_rate; static uint32_t enc_size; static int32_t err IBSS_ATTR; @@ -226,16 +227,37 @@ static inline void sample_to_mono(uint32_t **src, uint32_t **dst) { int32_t lr1, lr2; - lr1 = *(*src)++; - lr1 = (int16_t)lr1 + (lr1 >> 16) + err; - err = lr1 & 1; - lr1 >>= 1; - - lr2 = *(*src)++; - lr2 = (int16_t)lr2 + (lr2 >> 16) + err; - err = lr2 & 1; - lr2 >>= 1; - *(*dst)++ = swap_odd_even_le32((lr1 << 16) | (uint16_t)lr2); + switch(rec_mono_mode) + { + case 1: + /* mono = L */ + lr1 = *(*src)++; + lr1 = lr1 >> 16; + lr2 = *(*src)++; + lr2 = lr2 >> 16; + break; + case 2: + /* mono = R */ + lr1 = *(*src)++; + lr1 = (int16_t)lr1; + lr2 = *(*src)++; + lr2 = (int16_t)lr2; + break; + case 0: + default: + /* mono = (L+R)/2 */ + lr1 = *(*src)++; + lr1 = (int16_t)lr1 + (lr1 >> 16) + err; + err = lr1 & 1; + lr1 >>= 1; + + lr2 = *(*src)++; + lr2 = (int16_t)lr2 + (lr2 >> 16) + err; + err = lr2 & 1; + lr2 >>= 1; + break; + } + *(*dst)++ = swap_odd_even_be32((lr1 << 16) | (uint16_t)lr2); } /* sample_to_mono */ STATICIRAM void chunk_to_aiff_format(uint32_t *src, uint32_t *dst) ICODE_ATTR; @@ -316,6 +338,7 @@ static bool init_encoder(void) sample_rate = inputs.sample_rate; num_channels = inputs.num_channels; + rec_mono_mode = inputs.rec_mono_mode; err = 0; /* configure the buffer system */ |