Please find the output from snd_pcm_dump() attached. Is there any simple app to show the usage of forward/rewind APIs? I want to cross check my app against the same. Thanks and Regards, Anuj Aggarwal Platform Support Products Texas Instruments Inc Ph: +91-80-2509-9542 TI IP Ph: 509-9542 PSP Products RSS Feed PSP Product Announcements -----Original Message----- From: Jaroslav Kysela [mailto:perex@xxxxxxxx] Sent: Monday, May 12, 2008 1:47 PM To: Aggarwal, Anuj Cc: alsa-devel@xxxxxxxxxxxxxxxx Subject: Re: Forward/rewind APIs return 0 On Mon, 12 May 2008, Aggarwal, Anuj wrote: > Hi, > > I am trying to use snd_pcm_forward and snd_pcm_rewind APIs in my > application. Although they are doing something (I am able to 'hear' the > jump), they return me 0, instead of returning me the number of frames. > > What could be the problem with the application/driver? Show us output from snd_pcm_dump(). Jaroslav ----- Jaroslav Kysela <perex@xxxxxxxx> Linux Kernel Sound Maintainer ALSA Project, Red Hat, Inc.
[root@OMAP3EVM bin]# ./forward_pcm_new Playback : Open Success Capture : Open Success Hardware Configuration : Memory Allocation, Success Hardware Configuration :Initialization, Success Hardware Configuration : Set Access Success Hardware Configuration : Set Format Success Hardware Configuration : Set Rate Success Hardware Configuration : Set Channel Success PCM is in OPEN State before snd_pcm_hw_params PCM access type is RW_INTERLEAVED Hardware Configuration : Set Parameters Success PCM is in PREPARED State Capture : Hardware Configuration : Success Hardware Configuration : Memory Allocation, Success Hardware Configuration :Initialization, Success Hardware Configuration : Set Access Success Hardware Configuration : Set Format Success Hardware Configuration : Set Rate Success Hardware Configuration : Set Channel Success PCM is in OPEN State before snd_pcm_hw_params PCM access type is RW_INTERLEAVED Hardware Configuration : Set Parameters Success PCM is in PREPARED State Capture : Hardware Configuration : Success STFullDuplexAudio:: STRecordAudio thread: Pass: Status = 0 STFullDuplexAudio:: STPlaybackAudio thread: Pass: Status = 0 Playback Buffer number:0 STRecordAudio: Success for buffer 0, 1076830216 STPlaybackAudio: Success for buffer 0, 1076830216 Playback Buffer number:1 STRecordAudio: Success for buffer 1, 1077882888 STPlaybackAudio: Success for buffer 1, 1077882888 Playback Buffer number:2 STRecordAudio: Success for buffer 2, 1078935560 STPlaybackAudio: Success for buffer 2, 1078935560 Before: Plug PCM: Hardware PCM card 0 'TWL4030' device 0 subdevice 0 Its setup is: stream : PLAYBACK access : RW_INTERLEAVED format : S16_LE subformat : STD channels : 2 rate : 44100 exact rate : 44100 (44100/1) msbits : 16 buffer_size : 32768 period_size : 1024 period_time : 23219 tick_time : 7812 tstamp_mode : NONE period_step : 1 sleep_min : 0 avail_min : 1024 xfer_align : 1024 start_threshold : 1 stop_threshold : 32768 silence_threshold: 0 silence_size : 0 boundary : 1073741824 Playback : Forward No Action After: Plug PCM: Hardware PCM card 0 'TWL4030' device 0 subdevice 0 Its setup is: stream : PLAYBACK access : RW_INTERLEAVED format : S16_LE subformat : STD channels : 2 rate : 44100 exact rate : 44100 (44100/1) msbits : 16 buffer_size : 32768 period_size : 1024 period_time : 23219 tick_time : 7812 tstamp_mode : NONE period_step : 1 sleep_min : 0 avail_min : 1024 xfer_align : 1024 start_threshold : 1 stop_threshold : 32768 silence_threshold: 0 silence_size : 0 boundary : 1073741824 Playback Buffer number:2 STRecordAudio: Success for buffer 3, 1079988232 STPlaybackAudio: Success for buffer 2, 1078935560 Before: Plug PCM: Hardware PCM card 0 'TWL4030' device 0 subdevice 0 Its setup is: stream : PLAYBACK access : RW_INTERLEAVED format : S16_LE subformat : STD channels : 2 rate : 44100 exact rate : 44100 (44100/1) msbits : 16 buffer_size : 32768 period_size : 1024 period_time : 23219 tick_time : 7812 tstamp_mode : NONE period_step : 1 sleep_min : 0 avail_min : 1024 xfer_align : 1024 start_threshold : 1 stop_threshold : 32768 silence_threshold: 0 silence_size : 0 boundary : 1073741824 Playback : Forward No Action After: Plug PCM: Hardware PCM card 0 'TWL4030' device 0 subdevice 0 Its setup is: stream : PLAYBACK access : RW_INTERLEAVED format : S16_LE subformat : STD channels : 2 rate : 44100 exact rate : 44100 (44100/1) msbits : 16 buffer_size : 32768 period_size : 1024 period_time : 23219 tick_time : 7812 tstamp_mode : NONE period_step : 1 sleep_min : 0 avail_min : 1024 xfer_align : 1024 start_threshold : 1 stop_threshold : 32768 silence_threshold: 0 silence_size : 0 boundary : 1073741824 Playback Buffer number:2
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