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ALSA: firewire-lib: use packet descriptor for IR context

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This commit uses packet descriptor to parse headers of IR context and
parse timing information for sequence transferred by target device.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2019-07-22 12:37:00 +09:00 committed by Takashi Iwai
parent f4f6ae7b7c
commit 753e717986
1 changed files with 63 additions and 33 deletions
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96
sound/firewire/amdtp-stream.c
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@ -602,6 +602,8 @@ static int check_cip_header(struct amdtp_stream *s, const __be32 *buf,
return -EIO;
}
*data_block_counter = dbc;
*syt = cip_header[1] & CIP_SYT_MASK;
return 0;
@ -676,6 +678,48 @@ static inline u32 compute_it_cycle(const __be32 ctx_header_tstamp)
return increment_cycle_count(cycle, QUEUE_LENGTH);
}
static int generate_device_pkt_descs(struct amdtp_stream *s,
struct pkt_desc *descs,
const __be32 *ctx_header,
unsigned int packets)
{
unsigned int dbc = s->data_block_counter;
int i;
int err;
for (i = 0; i < packets; ++i) {
struct pkt_desc *desc = descs + i;
unsigned int index = (s->packet_index + i) % QUEUE_LENGTH;
unsigned int cycle;
unsigned int payload_length;
unsigned int data_blocks;
unsigned int syt;
cycle = compute_cycle_count(ctx_header[1]);
err = parse_ir_ctx_header(s, cycle, ctx_header, &payload_length,
&data_blocks, &dbc, &syt, i);
if (err < 0)
return err;
desc->cycle = cycle;
desc->syt = syt;
desc->data_blocks = data_blocks;
desc->data_block_counter = dbc;
desc->ctx_payload = s->buffer.packets[index].buffer;
if (!(s->flags & CIP_DBC_IS_END_EVENT))
dbc = (dbc + desc->data_blocks) & 0xff;
ctx_header +=
s->ctx_data.tx.ctx_header_size / sizeof(*ctx_header);
}
s->data_block_counter = dbc;
return 0;
}
static void generate_ideal_pkt_descs(struct amdtp_stream *s,
struct pkt_desc *descs,
const __be32 *ctx_header,
@ -770,8 +814,10 @@ static void in_stream_callback(struct fw_iso_context *context, u32 tstamp,
void *private_data)
{
struct amdtp_stream *s = private_data;
unsigned int i, packets;
unsigned int packets;
__be32 *ctx_header = header;
int i;
int err;
if (s->packet_index < 0)
return;
@ -779,50 +825,34 @@ static void in_stream_callback(struct fw_iso_context *context, u32 tstamp,
// The number of packets in buffer.
packets = header_length / s->ctx_data.tx.ctx_header_size;
err = generate_device_pkt_descs(s, s->pkt_descs, ctx_header, packets);
if (err < 0) {
if (err != -EAGAIN) {
cancel_stream(s);
return;
}
}
for (i = 0; i < packets; i++) {
u32 cycle;
unsigned int payload_length;
unsigned int data_blocks;
unsigned int dbc;
unsigned int syt;
__be32 *buffer;
const struct pkt_desc *desc = s->pkt_descs;
unsigned int pcm_frames = 0;
struct fw_iso_packet params = {0};
struct snd_pcm_substream *pcm;
int err;
cycle = compute_cycle_count(ctx_header[1]);
dbc = s->data_block_counter;
err = parse_ir_ctx_header(s, cycle, ctx_header, &payload_length,
&data_blocks, &dbc, &syt, i);
if (err < 0 && err != -EAGAIN)
break;
if (err >= 0) {
buffer = s->buffer.packets[s->packet_index].buffer;
pcm_frames = s->process_data_blocks(s, buffer,
data_blocks, dbc);
if (!(s->flags & CIP_DBC_IS_END_EVENT))
dbc = (dbc + data_blocks) & 0xff;
pcm_frames = s->process_data_blocks(s,
desc->ctx_payload, desc->data_blocks,
desc->data_block_counter);
}
s->data_block_counter = dbc;
if (queue_in_packet(s, &params) < 0)
break;
if (queue_in_packet(s, &params) < 0) {
cancel_stream(s);
return;
}
pcm = READ_ONCE(s->pcm);
if (pcm && pcm_frames > 0)
update_pcm_pointers(s, pcm, pcm_frames);
ctx_header += s->ctx_data.tx.ctx_header_size / sizeof(*ctx_header);
}
/* Queueing error or detecting invalid payload. */
if (i < packets) {
cancel_stream(s);
return;
}
fw_iso_context_queue_flush(s->context);