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adapt msbc decoding to a MTU of 48

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Mauricio Collares 2020-12-16 20:25:40 -03:00 • committed by Wim Taymans
parent 3ad39d83a1
commit a30b7518f3
1 changed files with 20 additions and 19 deletions
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39
spa/plugins/bluez5/sco-source.c
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@ -333,6 +333,16 @@ static uint8_t* find_h2_header(uint8_t *data, size_t len)
return NULL; return NULL;
} }
/* Compact msbc_buffer to keep it under 2 * MSBC_ENCODED_SIZE */
void compact_msbc_buffer(struct impl *this, uint8_t *tail, uint8_t *head) {
if (head != tail) {
spa_memmove(this->msbc_buffer, tail, head - tail);
this->msbc_buffer_head = this->msbc_buffer + (head - tail);
this->msbc_buffer_tail = this->msbc_buffer;
} else
this->msbc_buffer_head = this->msbc_buffer_tail = this->msbc_buffer;
}
static void sco_on_ready_read(struct spa_source *source) static void sco_on_ready_read(struct spa_source *source)
{ {
struct impl *this = source->data; struct impl *this = source->data;
@ -390,6 +400,12 @@ static void sco_on_ready_read(struct spa_source *source)
return; return;
} }
/* We might discard up to MTU - 2 bytes. If MTU = 48, we might need two
more packets to get MSBC_ENCODED_SIZE valid bytes. Therefore, without
compacting here we would need MSBC_BUFFER_SIZE >= 3*MTU - 2. In practice,
for MTU = 48, we frequently need MSBC_BUFFER_SIZE >= 132. */
compact_msbc_buffer(this, this->msbc_buffer_tail, this->msbc_buffer_head);
if (this->msbc_buffer_head - this->msbc_buffer_tail < MSBC_ENCODED_SIZE) { if (this->msbc_buffer_head - this->msbc_buffer_tail < MSBC_ENCODED_SIZE) {
spa_log_trace(this->log, "partial packet"); spa_log_trace(this->log, "partial packet");
return; return;
@ -399,11 +415,8 @@ static void sco_on_ready_read(struct spa_source *source)
if (next_header && (next_header - this->msbc_buffer_tail) != MSBC_ENCODED_SIZE) { if (next_header && (next_header - this->msbc_buffer_tail) != MSBC_ENCODED_SIZE) {
spa_log_trace(this->log, "incomplete packet"); spa_log_trace(this->log, "incomplete packet");
this->msbc_seq = (this->msbc_seq + 1) % 4; this->msbc_seq = (this->msbc_seq + 1) % 4;
/* Drop the incomplete packet and compact */
/* Drop the incomplete packet and compact msbc_buffer to keep it under 2 * MSBC_ENCODED_SIZE */ compact_msbc_buffer(this, next_header, this->msbc_buffer_head);
spa_memmove(this->msbc_buffer, next_header, this->msbc_buffer_head - next_header);
this->msbc_buffer_head = this->msbc_buffer + (this->msbc_buffer_head - next_header);
this->msbc_buffer_tail = this->msbc_buffer;
/* TODO: Implement PLC? */ /* TODO: Implement PLC? */
return; return;
} }
@ -427,25 +440,13 @@ static void sco_on_ready_read(struct spa_source *source)
/* TODO: manage errors */ /* TODO: manage errors */
this->msbc_buffer_tail += MSBC_ENCODED_SIZE; this->msbc_buffer_tail += MSBC_ENCODED_SIZE;
if (this->msbc_buffer_head != this->msbc_buffer_tail) { compact_msbc_buffer(this, this->msbc_buffer_tail, this->msbc_buffer_head);
/* Compact msbc_buffer to keep it under 2 * MSBC_ENCODED_SIZE */
spa_memmove(this->msbc_buffer, this->msbc_buffer_tail, this->msbc_buffer_head - this->msbc_buffer_tail);
this->msbc_buffer_head = this->msbc_buffer + (this->msbc_buffer_head - this->msbc_buffer_tail);
this->msbc_buffer_tail = this->msbc_buffer;
} else
this->msbc_buffer_head = this->msbc_buffer_tail = this->msbc_buffer;
return; return;
} }
this->msbc_seq = (this->msbc_seq + 1) % 4; this->msbc_seq = (this->msbc_seq + 1) % 4;
this->msbc_buffer_tail += MSBC_ENCODED_SIZE; this->msbc_buffer_tail += MSBC_ENCODED_SIZE;
if (this->msbc_buffer_head != this->msbc_buffer_tail) { compact_msbc_buffer(this, this->msbc_buffer_tail, this->msbc_buffer_head);
/* Compact msbc_buffer to keep it under 2 * MSBC_ENCODED_SIZE */
spa_memmove(this->msbc_buffer, this->msbc_buffer_tail, this->msbc_buffer_head - this->msbc_buffer_tail);
this->msbc_buffer_head = this->msbc_buffer + (this->msbc_buffer_head - this->msbc_buffer_tail);
this->msbc_buffer_tail = this->msbc_buffer;
} else
this->msbc_buffer_head = this->msbc_buffer_tail = this->msbc_buffer;
} else { } else {
decoded = size_read; decoded = size_read;
} }