Until now SBC processed 4 blocks at a time. If we want to process 15 blocks,
then we need to break this processing in one block steps. 4 blocks is still
default increment.
---
sbc/sbc.c | 19 +++++++++++--------
sbc/sbc_primitives.h | 6 ++++--
2 files changed, 15 insertions(+), 10 deletions(-)
diff --git a/sbc/sbc.c b/sbc/sbc.c
index e51ed57..4a7dd2e 100644
--- a/sbc/sbc.c
+++ b/sbc/sbc.c
@@ -688,30 +688,32 @@ static int sbc_analyze_audio(struct sbc_encoder_state *state,
switch (frame->subbands) {
case 4:
for (ch = 0; ch < frame->channels; ch++) {
- x = &state->X[ch][state->position - 16 +
- frame->blocks * 4];
- for (blk = 0; blk < frame->blocks; blk += 4) {
+ x = &state->X[ch][state->position - 4 *
+ state->increment + frame->blocks * 4];
+ for (blk = 0; blk < frame->blocks;
+ blk += state->increment) {
state->sbc_analyze_4b_4s(
state, x,
frame->sb_sample_f[blk][ch],
frame->sb_sample_f[blk + 1][ch] -
frame->sb_sample_f[blk][ch]);
- x -= 16;
+ x -= 4 * state->increment;
}
}
return frame->blocks * 4;
case 8:
for (ch = 0; ch < frame->channels; ch++) {
- x = &state->X[ch][state->position - 32 +
- frame->blocks * 8];
- for (blk = 0; blk < frame->blocks; blk += 4) {
+ x = &state->X[ch][state->position - 8 *
+ state->increment + frame->blocks * 8];
+ for (blk = 0; blk < frame->blocks;
+ blk += state->increment) {
state->sbc_analyze_4b_8s(
state, x,
frame->sb_sample_f[blk][ch],
frame->sb_sample_f[blk + 1][ch] -
frame->sb_sample_f[blk][ch]);
- x -= 32;
+ x -= 8 * state->increment;
}
}
return frame->blocks * 8;
@@ -906,6 +908,7 @@ static void sbc_encoder_init(struct sbc_encoder_state *state,
{
memset(&state->X, 0, sizeof(state->X));
state->position = (SBC_X_BUFFER_SIZE - frame->subbands * 9) & ~7;
+ state->increment = 4;
sbc_init_primitives(state);
}
diff --git a/sbc/sbc_primitives.h b/sbc/sbc_primitives.h
index a7bbef1..2a7d4a1 100644
--- a/sbc/sbc_primitives.h
+++ b/sbc/sbc_primitives.h
@@ -38,13 +38,15 @@
struct sbc_encoder_state {
int position;
+ /* Number of consecutive blocks handled by the encoder */
+ int increment;
int16_t SBC_ALIGNED X[2][SBC_X_BUFFER_SIZE];
/* Polyphase analysis filter for 4 subbands configuration,
- * it handles 4 blocks at once */
+ * it handles "increment" blocks at once */
void (*sbc_analyze_4b_4s)(struct sbc_encoder_state *state,
int16_t *x, int32_t *out, int out_stride);
/* Polyphase analysis filter for 8 subbands configuration,
- * it handles 4 blocks at once */
+ * it handles "increment" blocks at once */
void (*sbc_analyze_4b_8s)(struct sbc_encoder_state *state,
int16_t *x, int32_t *out, int out_stride);
/* Process input data (deinterleave, endian conversion, reordering),
--
1.7.9.5
--
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