diff options
Diffstat (limited to 'sound/firewire')
| -rw-r--r-- | sound/firewire/amdtp-stream.c | 33 |
1 files changed, 19 insertions, 14 deletions
diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c index 9041510cb6aa..efd1f2a40cf1 100644 --- a/sound/firewire/amdtp-stream.c +++ b/sound/firewire/amdtp-stream.c @@ -339,25 +339,26 @@ void amdtp_stream_pcm_prepare(struct amdtp_stream *s) } EXPORT_SYMBOL(amdtp_stream_pcm_prepare); -static unsigned int calculate_data_blocks(struct amdtp_stream *s, - unsigned int syt) +static unsigned int calculate_data_blocks(unsigned int *data_block_state, + bool is_blocking, bool is_no_info, + unsigned int syt_interval, enum cip_sfc sfc) { - unsigned int phase, data_blocks; + unsigned int data_blocks; /* Blocking mode. */ - if (s->flags & CIP_BLOCKING) { + if (is_blocking) { /* This module generate empty packet for 'no data'. */ - if (syt == CIP_SYT_NO_INFO) + if (is_no_info) data_blocks = 0; else - data_blocks = s->syt_interval; + data_blocks = syt_interval; /* Non-blocking mode. */ } else { - if (!cip_sfc_is_base_44100(s->sfc)) { + if (!cip_sfc_is_base_44100(sfc)) { // Sample_rate / 8000 is an integer, and precomputed. - data_blocks = s->ctx_data.rx.data_block_state; + data_blocks = *data_block_state; } else { - phase = s->ctx_data.rx.data_block_state; + unsigned int phase = *data_block_state; /* * This calculates the number of data blocks per packet so that @@ -367,16 +368,16 @@ static unsigned int calculate_data_blocks(struct amdtp_stream *s, * as possible in the sequence (to prevent underruns of the * device's buffer). */ - if (s->sfc == CIP_SFC_44100) + if (sfc == CIP_SFC_44100) /* 6 6 5 6 5 6 5 ... */ data_blocks = 5 + ((phase & 1) ^ (phase == 0 || phase >= 40)); else /* 12 11 11 11 11 ... or 23 22 22 22 22 ... */ - data_blocks = 11 * (s->sfc >> 1) + (phase == 0); - if (++phase >= (80 >> (s->sfc >> 1))) + data_blocks = 11 * (sfc >> 1) + (phase == 0); + if (++phase >= (80 >> (sfc >> 1))) phase = 0; - s->ctx_data.rx.data_block_state = phase; + *data_block_state = phase; } } @@ -769,7 +770,11 @@ static void generate_ideal_pkt_descs(struct amdtp_stream *s, } else { desc->syt = syt_offset; } - desc->data_blocks = calculate_data_blocks(s, desc->syt); + desc->data_blocks = + calculate_data_blocks(&s->ctx_data.rx.data_block_state, + !!(s->flags & CIP_BLOCKING), + desc->syt == CIP_SYT_NO_INFO, + s->syt_interval, s->sfc); if (s->flags & CIP_DBC_IS_END_EVENT) dbc = (dbc + desc->data_blocks) & 0xff; |