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. --- sound/firewire/amdtp.c | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-)
diff --git a/sound/firewire/amdtp.c b/sound/firewire/amdtp.c index ad3521f..56b01c8 100644 --- a/sound/firewire/amdtp.c +++ b/sound/firewire/amdtp.c @@ -256,7 +256,9 @@ 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 { @@ -620,26 +622,22 @@ 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); @@ -737,7 +735,7 @@ 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. @@ -746,8 +744,10 @@ 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); }