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| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2023-01-10 16:49:31 +0300 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2023-01-12 14:14:49 +0300 |
| commit | a36183f69c2c24e6e4b1f8f79adc7137ee7444d9 (patch) | |
| tree | fe21c2c809c03499310077047d83ecdaccb7caf3 /sound/firewire/amdtp-stream.c | |
| parent | fef4e61b0b765b6d22badcd5b6575b159e7d510a (diff) | |
| download | linux-a36183f69c2c24e6e4b1f8f79adc7137ee7444d9.tar.xz | |
ALSA: firewire-lib: move parameter for pcm frame multiplier from context payload processing layer
The current implementation delegates the task to calculate the number of
processed PCM frames into the context payload processing layer. It looks
good as long as frame calculation is done for a single purpose.
Nevertheless, another purpose, the computation of extra delay for the
runtime of PCM substream, requires frame calculation, too.
This commit refactors the current implementation so that the packet stream
processing layer is responsible for the calculation of PCM frame, too. The
member is moved to stream structure for multiplier between data block
count and PCM frame count.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20230110134933.322794-2-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/firewire/amdtp-stream.c')
| -rw-r--r-- | sound/firewire/amdtp-stream.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c index 65720ae866cb..453751e4fef8 100644 --- a/sound/firewire/amdtp-stream.c +++ b/sound/firewire/amdtp-stream.c @@ -271,12 +271,14 @@ EXPORT_SYMBOL(amdtp_stream_add_pcm_hw_constraints); * @s: the AMDTP stream to configure * @rate: the sample rate * @data_block_quadlets: the size of a data block in quadlet unit + * @pcm_frame_multiplier: the multiplier to compute the number of PCM frames by the number of AMDTP + * events. * * The parameters must be set before the stream is started, and must not be * changed while the stream is running. */ int amdtp_stream_set_parameters(struct amdtp_stream *s, unsigned int rate, - unsigned int data_block_quadlets) + unsigned int data_block_quadlets, unsigned int pcm_frame_multiplier) { unsigned int sfc; @@ -298,6 +300,8 @@ int amdtp_stream_set_parameters(struct amdtp_stream *s, unsigned int rate, if (s->flags & CIP_BLOCKING) s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate; + s->pcm_frame_multiplier = pcm_frame_multiplier; + return 0; } EXPORT_SYMBOL(amdtp_stream_set_parameters); @@ -1032,16 +1036,25 @@ static inline void cancel_stream(struct amdtp_stream *s) } static void process_ctx_payloads(struct amdtp_stream *s, - const struct pkt_desc *descs, + const struct pkt_desc *desc, unsigned int count) { struct snd_pcm_substream *pcm; - unsigned int pcm_frames; + int i; pcm = READ_ONCE(s->pcm); - pcm_frames = s->process_ctx_payloads(s, descs, count, pcm); - if (pcm) - update_pcm_pointers(s, pcm, pcm_frames); + (void)s->process_ctx_payloads(s, desc, count, pcm); + + if (pcm) { + unsigned int data_block_count = 0; + + for (i = 0; i < count; ++i) { + data_block_count += desc->data_blocks; + desc = amdtp_stream_next_packet_desc(s, desc); + } + + update_pcm_pointers(s, pcm, data_block_count * s->pcm_frame_multiplier); + } } static void process_rx_packets(struct fw_iso_context *context, u32 tstamp, size_t header_length, |