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ALSA: firewire-lib: Give syt value as parameter to handle_out_packet() 

For duplex streams with synchronization, drivers should pick up
'presentation timestamp' from in-packets and use the timestamp for
out-packets. This commit is preparation for this.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2014-04-25 22:44:48 +09:00 committed by Takashi Iwai
parent 83d8d72dff
commit ccccad8646
1 changed files with 12 additions and 12 deletions
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24
sound/firewire/amdtp.c
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@ -257,7 +257,9 @@ static unsigned int calculate_data_blocks(struct amdtp_stream *s)
{
unsigned int phase, data_blocks;
if (!cip_sfc_is_base_44100(s->sfc)) {
if (s->flags & CIP_BLOCKING)
data_blocks = s->syt_interval;
else if (!cip_sfc_is_base_44100(s->sfc)) {
/* Sample_rate / 8000 is an integer, and precomputed. */
data_blocks = s->data_block_state;
} else {
@ -616,26 +618,22 @@ static inline int queue_in_packet(struct amdtp_stream *s)
amdtp_stream_get_max_payload(s), false);
}
static void handle_out_packet(struct amdtp_stream *s, unsigned int cycle)
static void handle_out_packet(struct amdtp_stream *s, unsigned int syt)
{
__be32 *buffer;
unsigned int index, data_blocks, syt, payload_length;
unsigned int data_blocks, payload_length;
struct snd_pcm_substream *pcm;
if (s->packet_index < 0)
return;
index = s->packet_index;
/* this module generate empty packet for 'no data' */
syt = calculate_syt(s, cycle);
if (!(s->flags & CIP_BLOCKING))
if (!(s->flags & CIP_BLOCKING) || (syt != CIP_SYT_NO_INFO))
data_blocks = calculate_data_blocks(s);
else if (syt != CIP_SYT_NO_INFO)
data_blocks = s->syt_interval;
else
data_blocks = 0;
buffer = s->buffer.packets[index].buffer;
buffer = s->buffer.packets[s->packet_index].buffer;
buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) |
(s->data_block_quadlets << AMDTP_DBS_SHIFT) |
s->data_block_counter);
@ -746,7 +744,7 @@ static void out_stream_callback(struct fw_iso_context *context, u32 cycle,
void *private_data)
{
struct amdtp_stream *s = private_data;
unsigned int i, packets = header_length / 4;
unsigned int i, syt, packets = header_length / 4;
/*
* Compute the cycle of the last queued packet.
@ -755,8 +753,10 @@ static void out_stream_callback(struct fw_iso_context *context, u32 cycle,
*/
cycle += QUEUE_LENGTH - packets;
for (i = 0; i < packets; ++i)
handle_out_packet(s, ++cycle);
for (i = 0; i < packets; ++i) {
syt = calculate_syt(s, ++cycle);
handle_out_packet(s, syt);
}
fw_iso_context_queue_flush(s->context);
}