Hi,
On Jan 30 2018 18:34, Sriram Periyasamy wrote:
> From: Ramesh Babu <ramesh.babu@xxxxxxxxx>
>
> The "no-rewind" flag is introduced in alsa.
> Application can use this flag to assure kernel driver
> that rewind won't be exercised. Driver could use this
> flag to alter it's buffering scheme to optimize power
> and performance.
>
> Signed-off-by: Ramesh Babu <ramesh.babu@xxxxxxxxx>
> Signed-off-by: Sriram Periyasamy <sriramx.periyasamy@xxxxxxxxx>
> ---
> aplay/aplay.c | 14 +++++++++++++-
> 1 file changed, 13 insertions(+), 1 deletion(-)
Current implementation of 'aplay' doesn't perform rewinding/forwarding,
thus an additional of this option is surplus.
> diff --git a/aplay/aplay.c b/aplay/aplay.c
> index 6b740c281f8e..b50602a59024 100644
> --- a/aplay/aplay.c
> +++ b/aplay/aplay.c
> @@ -108,6 +108,7 @@ static snd_pcm_stream_t stream = SND_PCM_STREAM_PLAYBACK;
> static int mmap_flag = 0;
> static int interleaved = 1;
> static int nonblock = 0;
> +static int no_rewind = 0;
> static volatile sig_atomic_t in_aborting = 0;
> static u_char *audiobuf = NULL;
> static snd_pcm_uframes_t chunk_size = 0;
> @@ -229,6 +230,7 @@ _("Usage: %s [OPTION]... [FILE]...\n"
> "-I, --separate-channels one file for each channel\n"
> "-i, --interactive allow interactive operation from stdin\n"
> "-m, --chmap=ch1,ch2,.. Give the channel map to override or follow\n"
> +"-w, --no-rewind enables no rewind mode\n"
> " --disable-resample disable automatic rate resample\n"
> " --disable-channels disable automatic channel conversions\n"
> " --disable-format disable automatic format conversions\n"
> @@ -470,7 +472,7 @@ int main(int argc, char *argv[])
> {
> int duration_or_sample = 0;
> int option_index;
> - static const char short_options[] = "hnlLD:qt:c:f:r:d:s:MNF:A:R:T:B:vV:IPCi"
> + static const char short_options[] = "hnlLD:qt:c:f:r:d:s:w:MNF:A:R:T:B:vV:IPCi"
> #ifdef CONFIG_SUPPORT_CHMAP
> "m:"
> #endif
> @@ -514,6 +516,7 @@ int main(int argc, char *argv[])
> {"process-id-file", 1, 0, OPT_PROCESS_ID_FILE},
> {"use-strftime", 0, 0, OPT_USE_STRFTIME},
> {"interactive", 0, 0, 'i'},
> + {"no-rewind", 0, 0, 'w'},
> {"dump-hw-params", 0, 0, OPT_DUMP_HWPARAMS},
> {"fatal-errors", 0, 0, OPT_FATAL_ERRORS},
> #ifdef CONFIG_SUPPORT_CHMAP
> @@ -753,6 +756,9 @@ int main(int argc, char *argv[])
> case 'i':
> interactive = 1;
> break;
> + case 'w':
> + no_rewind = 1;
> + break;
> case OPT_DISABLE_RESAMPLE:
> open_mode |= SND_PCM_NO_AUTO_RESAMPLE;
> break;
> @@ -1396,6 +1402,12 @@ static void set_params(void)
> &buffer_frames);
> }
> assert(err >= 0);
> +
> + if (no_rewind) {
> + err = snd_pcm_hw_params_set_no_rewind(handle, params, 1);
> + assert(err >= 0);
> + }
> +
> monotonic = snd_pcm_hw_params_is_monotonic(params);
> can_pause = snd_pcm_hw_params_can_pause(params);
> err = snd_pcm_hw_params(handle, params);
Regards
Takashi Sakamoto
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