On 1/30/18 11:40 AM, Takashi Sakamoto wrote:
Hi,
On Jan 30 2018 18:34, Sriram Periyasamy wrote:
From: Ramesh Babu ramesh.babu@intel.com
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@intel.com Signed-off-by: Sriram Periyasamy sriramx.periyasamy@intel.com
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.
It helps tell the driver that rewinds won't be used and indirectly that the appl_ptr updates are passed to the hardware. Removing the option or making the functionality unconditional removes the freedom to test with or without this option.
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'},@@ -753,6 +756,9 @@ int main(int argc, char *argv[]) case 'i': interactive = 1; break;
case 'w':no_rewind = 1;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 _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel