[alsa-devel] [PATCH RFC 0/4] alsa-lib: audio timestamping evolutions
alsa-lib patches corresponding to the kernel ones just posted. Tested with HDAudio and USB audio class.
Pierre-Louis Bossart (4): sync asound.h with kernel version add support for get/set_audio_htstamp_config pcm: add helper functions to query timestamping capabilities test: fix audio_time with new get/set audio_tstamp_config
include/pcm.h | 43 ++++- include/sound/asound.h | 20 ++- src/pcm/pcm.c | 82 ++++++++- test/audio_time.c | 473 +++++++++++++++++++++++++++++++------------------ 4 files changed, 436 insertions(+), 182 deletions(-)
Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com --- include/sound/asound.h | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-)
diff --git a/include/sound/asound.h b/include/sound/asound.h index 941d32f..b89ad01 100644 --- a/include/sound/asound.h +++ b/include/sound/asound.h @@ -266,7 +266,12 @@ typedef int __bitwise snd_pcm_subformat_t; #define SNDRV_PCM_INFO_JOINT_DUPLEX 0x00200000 /* playback and capture stream are somewhat correlated */ #define SNDRV_PCM_INFO_SYNC_START 0x00400000 /* pcm support some kind of sync go */ #define SNDRV_PCM_INFO_NO_PERIOD_WAKEUP 0x00800000 /* period wakeup can be disabled */ -#define SNDRV_PCM_INFO_HAS_WALL_CLOCK 0x01000000 /* has audio wall clock for audio/system time sync */ + +#define SNDRV_PCM_INFO_HAS_LINK_ATIME 0x01000000 /* report hardware link audio time, reset on startup */ +#define SNDRV_PCM_INFO_HAS_LINK_ABSOLUTE_ATIME 0x02000000 /* report absolute hardware link audio time, not reset on startup */ +#define SNDRV_PCM_INFO_HAS_LINK_ESTIMATED_ATIME 0x04000000 /* report estimated link audio time */ +#define SNDRV_PCM_INFO_HAS_LINK_SYNCHRONIZED_ATIME 0x08000000 /* report synchronized audio/system time */ +#define SNDRV_PCM_INFO_HAS_WALL_CLOCK SNDRV_PCM_INFO_HAS_LINK_ATIME /* deprecated, use LINK_ATIME */ #define SNDRV_PCM_INFO_FIFO_IN_FRAMES 0x80000000 /* internal kernel flag - FIFO size is in frames */
typedef int __bitwise snd_pcm_state_t; @@ -406,6 +411,15 @@ struct snd_pcm_channel_info { unsigned int step; /* samples distance in bits */ };
+enum { + SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT = 0, /* DMA time, reported as per hw_ptr */ + SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK = 1, /* link time reported by sample or wallclock counter, reset on startup */ + SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK_ABSOLUTE = 2, /* link time reported by sample or wallclock counter, not reset on startup */ + SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK_ESTIMATED = 3, /* link time estimated indirectly */ + SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK_SYNCHRONIZED = 4, /* link time synchronized with system time */ + SNDRV_PCM_AUDIO_TSTAMP_TYPE_LAST = SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK_SYNCHRONIZED +}; + struct snd_pcm_status { snd_pcm_state_t state; /* stream state */ struct timespec trigger_tstamp; /* time when stream was started/stopped/paused */ @@ -417,8 +431,8 @@ struct snd_pcm_status { snd_pcm_uframes_t avail_max; /* max frames available on hw since last status */ snd_pcm_uframes_t overrange; /* count of ADC (capture) overrange detections from last status */ snd_pcm_state_t suspended_state; /* suspended stream state */ - __u32 reserved_alignment; /* must be filled with zero */ - struct timespec audio_tstamp; /* from sample counter or wall clock */ + __u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */ + struct timespec audio_tstamp; /* sample counter, wall clock, PHC or on-demand sync'ed */ unsigned char reserved[56-sizeof(struct timespec)]; /* must be filled with zero */ };
Enable kernel-side functionality by letting user select what sort of timestamp it desires
Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com --- include/pcm.h | 38 ++++++++++++++++++++++++++++++++++++++ src/pcm/pcm.c | 24 ++++++++++++++++++++++++ 2 files changed, 62 insertions(+)
diff --git a/include/pcm.h b/include/pcm.h index 0655e7f..f963b92 100644 --- a/include/pcm.h +++ b/include/pcm.h @@ -330,6 +330,22 @@ typedef enum _snd_pcm_tstamp_type { SND_PCM_TSTAMP_TYPE_LAST = SND_PCM_TSTAMP_TYPE_MONOTONIC_RAW, } snd_pcm_tstamp_type_t;
+typedef struct _snd_pcm_audio_tstamp_config { + /* input from user space*/ + unsigned int type_requested:4; /* will be overridden and DEFAULT tstamp reported if not supported */ + unsigned int report_delay:1; /* add delay to A/D or D/A */ +} snd_pcm_audio_tstamp_config_t; + +typedef struct _snd_pcm_audio_tstamp_report { + /* actual type if hardware could not support requested timestamp */ + unsigned int actual_type:4; + + /* returned to userspace, accuracy represented in mantissa/exponent form */ + unsigned int accuracy_report:1; /* 0 if accuracy unknown, 1 if rest of structure is valid */ + unsigned int accuracy_m:7; /* 0..127, ~3 significant digit for mantissa */ + unsigned int accuracy_e:4; /* base10 exponent, 0 for ns, 3 for us, 6 for ms, 9 for s */ +} snd_pcm_audio_tstamp_report_t; + /** Unsigned frames quantity */ typedef unsigned long snd_pcm_uframes_t; /** Signed frames quantity */ @@ -980,6 +996,28 @@ void snd_pcm_status_get_trigger_htstamp(const snd_pcm_status_t *obj, snd_htimest void snd_pcm_status_get_tstamp(const snd_pcm_status_t *obj, snd_timestamp_t *ptr); void snd_pcm_status_get_htstamp(const snd_pcm_status_t *obj, snd_htimestamp_t *ptr); void snd_pcm_status_get_audio_htstamp(const snd_pcm_status_t *obj, snd_htimestamp_t *ptr); +void snd_pcm_status_get_audio_htstamp_report(const snd_pcm_status_t *obj, + snd_pcm_audio_tstamp_report_t *audio_tstamp_report); +void snd_pcm_status_set_audio_htstamp_config(snd_pcm_status_t *obj, + snd_pcm_audio_tstamp_config_t *audio_tstamp_config); + +static inline void snd_pcm_pack_audio_tstamp_config(unsigned int *data, + snd_pcm_audio_tstamp_config_t *config) +{ + *data = config->report_delay; + *data <<= 4; + *data |= config->type_requested; +} + +static inline void snd_pcm_unpack_audio_tstamp_report(unsigned int data, + snd_pcm_audio_tstamp_report_t *report) +{ + report->actual_type = data & 0xFF; + report->accuracy_report = (data >> 4) & 1; + report->accuracy_m = (data >> 7) & 0x7F; + report->accuracy_e = (data >> 12) & 0xF; +} + snd_pcm_sframes_t snd_pcm_status_get_delay(const snd_pcm_status_t *obj); snd_pcm_uframes_t snd_pcm_status_get_avail(const snd_pcm_status_t *obj); snd_pcm_uframes_t snd_pcm_status_get_avail_max(const snd_pcm_status_t *obj); diff --git a/src/pcm/pcm.c b/src/pcm/pcm.c index baa47c7..af7d8c9 100644 --- a/src/pcm/pcm.c +++ b/src/pcm/pcm.c @@ -6334,6 +6334,30 @@ void snd_pcm_status_get_audio_htstamp(const snd_pcm_status_t *obj, snd_htimestam }
/** + * \brief Get audio_tstamp_report from a PCM status container + * \param obj pointer to #snd_pcm_status_t + * \param ptr Pointer to returned report (valid fields are accuracy and type) + */ +void snd_pcm_status_get_audio_htstamp_report(const snd_pcm_status_t *obj, + snd_pcm_audio_tstamp_report_t *audio_tstamp_report) +{ + assert(obj && audio_tstamp_report); + snd_pcm_unpack_audio_tstamp_report(obj->audio_tstamp_data, audio_tstamp_report); +} + +/** + * \brief set audio_tstamp_config from a PCM status container + * \param obj pointer to #snd_pcm_status_t + * \param ptr Pointer to config (valid fields are type and report_analog_delay) + */ +void snd_pcm_status_set_audio_htstamp_config(snd_pcm_status_t *obj, + snd_pcm_audio_tstamp_config_t *audio_tstamp_config) +{ + assert(obj && audio_tstamp_config); + snd_pcm_pack_audio_tstamp_config(&obj->audio_tstamp_data, audio_tstamp_config); +} + +/** * \brief Get delay from a PCM status container (see #snd_pcm_delay) * \return Delay in frames *
extend support to link, link_estimated and link_synchronized timestamp. wall-clock is deprecated
Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com --- include/pcm.h | 5 ++++- src/pcm/pcm.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 61 insertions(+), 2 deletions(-)
diff --git a/include/pcm.h b/include/pcm.h index f963b92..f8c557b 100644 --- a/include/pcm.h +++ b/include/pcm.h @@ -684,7 +684,10 @@ int snd_pcm_hw_params_is_half_duplex(const snd_pcm_hw_params_t *params); int snd_pcm_hw_params_is_joint_duplex(const snd_pcm_hw_params_t *params); int snd_pcm_hw_params_can_sync_start(const snd_pcm_hw_params_t *params); int snd_pcm_hw_params_can_disable_period_wakeup(const snd_pcm_hw_params_t *params); -int snd_pcm_hw_params_supports_audio_wallclock_ts(const snd_pcm_hw_params_t *params); +int snd_pcm_hw_params_supports_audio_wallclock_ts(const snd_pcm_hw_params_t *params); /* deprecated */ +int snd_pcm_hw_params_supports_audio_link_ts(const snd_pcm_hw_params_t *params); +int snd_pcm_hw_params_supports_audio_link_estimated_ts(const snd_pcm_hw_params_t *params); +int snd_pcm_hw_params_supports_audio_link_synchronized_ts(const snd_pcm_hw_params_t *params); int snd_pcm_hw_params_get_rate_numden(const snd_pcm_hw_params_t *params, unsigned int *rate_num, unsigned int *rate_den); diff --git a/src/pcm/pcm.c b/src/pcm/pcm.c index af7d8c9..28a2a4e 100644 --- a/src/pcm/pcm.c +++ b/src/pcm/pcm.c @@ -3190,12 +3190,68 @@ int snd_pcm_hw_params_can_disable_period_wakeup(const snd_pcm_hw_params_t *param */ int snd_pcm_hw_params_supports_audio_wallclock_ts(const snd_pcm_hw_params_t *params) { + /* deprecated */ + return snd_pcm_hw_params_supports_audio_link_ts(params); +} + +/** + * \brief Check if hardware supports audio link timestamps + * \param params Configuration space + * \retval 0 Hardware doesn't support audio link timestamps + * \retval 1 Hardware supports audio link timestamps + * + * This function should only be called when the configuration space + * contains a single configuration. Call #snd_pcm_hw_params to choose + * a single configuration from the configuration space. + */ +int snd_pcm_hw_params_supports_audio_link_ts(const snd_pcm_hw_params_t *params) +{ + assert(params); + if (CHECK_SANITY(params->info == ~0U)) { + SNDMSG("invalid PCM info field"); + return 0; /* FIXME: should be a negative error? */ + } + return !!(params->info & SNDRV_PCM_INFO_HAS_LINK_ATIME); +} + +/** + * \brief Check if hardware supports audio link estimated timestamps + * \param params Configuration space + * \retval 0 Hardware doesn't support audio link estimated timestamps + * \retval 1 Hardware supports audio link estimated timestamps + * + * This function should only be called when the configuration space + * contains a single configuration. Call #snd_pcm_hw_params to choose + * a single configuration from the configuration space. + */ +int snd_pcm_hw_params_supports_audio_link_estimated_ts(const snd_pcm_hw_params_t *params) +{ + assert(params); + if (CHECK_SANITY(params->info == ~0U)) { + SNDMSG("invalid PCM info field"); + return 0; /* FIXME: should be a negative error? */ + } + return !!(params->info & SNDRV_PCM_INFO_HAS_LINK_ESTIMATED_ATIME); +} + +/** + * \brief Check if hardware supports audio link synchronized timestamps + * \param params Configuration space + * \retval 0 Hardware doesn't support audio link synchronized timestamps + * \retval 1 Hardware supports audio link synchronized timestamps + * + * This function should only be called when the configuration space + * contains a single configuration. Call #snd_pcm_hw_params to choose + * a single configuration from the configuration space. + */ +int snd_pcm_hw_params_supports_audio_link_synchronized_ts(const snd_pcm_hw_params_t *params) +{ assert(params); if (CHECK_SANITY(params->info == ~0U)) { SNDMSG("invalid PCM info field"); return 0; /* FIXME: should be a negative error? */ } - return !!(params->info & SNDRV_PCM_INFO_HAS_WALL_CLOCK); + return !!(params->info & SNDRV_PCM_INFO_HAS_LINK_SYNCHRONIZED_ATIME); }
/**
Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com --- test/audio_time.c | 473 ++++++++++++++++++++++++++++++++++-------------------- 1 file changed, 296 insertions(+), 177 deletions(-)
diff --git a/test/audio_time.c b/test/audio_time.c index 7435db6..fc65573 100644 --- a/test/audio_time.c +++ b/test/audio_time.c @@ -4,13 +4,39 @@ * helpful to verify the information reported by drivers. */
-#include "../include/asoundlib.h" +#include <stdio.h> +#include <malloc.h> +#include <unistd.h> +#include <stdlib.h> +#include <string.h> +#include <getopt.h> +#include <fcntl.h> +#include <ctype.h> +#include <errno.h> +#include <limits.h> +#include <time.h> +#include <locale.h> #include <math.h> +#include "../include/asoundlib.h"
-static char *device = "hw:0,0"; - +static char *command; +static char *pcm_name = "hw:0"; snd_output_t *output = NULL;
+static void usage(char *command) +{ + printf("Usage: %s [OPTION]... \n" + "\n" + "-h, --help help\n" + "-c, --capture capture tstamps \n" + "-d, --delay add delay \n" + "-D, --device=NAME select PCM by name \n" + "-p, --playback playback tstamps \n" + "-t, --ts_type=TYPE Default(0),link(1),link_estimated(2),synchronized(3) \n" + , command); +} + + long long timestamp2ns(snd_htimestamp_t t) { long long nsec; @@ -31,15 +57,20 @@ long long timediff(snd_htimestamp_t t1, snd_htimestamp_t t2) return nsec1 - nsec2; }
-void gettimestamp(snd_pcm_t *handle, snd_htimestamp_t *timestamp, - snd_htimestamp_t *trigger_timestamp, - snd_htimestamp_t *audio_timestamp, - snd_pcm_uframes_t *avail, snd_pcm_sframes_t *delay) +void _gettimestamp(snd_pcm_t *handle, snd_htimestamp_t *timestamp, + snd_htimestamp_t *trigger_timestamp, + snd_htimestamp_t *audio_timestamp, + snd_pcm_audio_tstamp_config_t *audio_tstamp_config, + snd_pcm_audio_tstamp_report_t *audio_tstamp_report, + snd_pcm_uframes_t *avail, snd_pcm_sframes_t *delay) { int err; snd_pcm_status_t *status;
snd_pcm_status_alloca(&status); + + snd_pcm_status_set_audio_htstamp_config(status, audio_tstamp_config); + if ((err = snd_pcm_status(handle, status)) < 0) { printf("Stream status error: %s\n", snd_strerror(err)); exit(0); @@ -47,6 +78,7 @@ void gettimestamp(snd_pcm_t *handle, snd_htimestamp_t *timestamp, snd_pcm_status_get_trigger_htstamp(status, trigger_timestamp); snd_pcm_status_get_htstamp(status, timestamp); snd_pcm_status_get_audio_htstamp(status, audio_timestamp); + snd_pcm_status_get_audio_htstamp_report(status, audio_tstamp_report); *avail = snd_pcm_status_get_avail(status); *delay = snd_pcm_status_get_delay(status); } @@ -55,18 +87,19 @@ void gettimestamp(snd_pcm_t *handle, snd_htimestamp_t *timestamp, #define PCM_LINK /* sync start for playback and capture */ #define TRACK_CAPTURE /* dump capture timing info */ #define TRACK_PLAYBACK /* dump playback timing info */ -#define TRACK_SAMPLE_COUNTS /* show difference between sample counters and audiotimestamps returned by driver */ +/*#define TRACK_SAMPLE_COUNTS */ /* show difference between sample counters and audiotimestamps returned by driver */ #define PLAYBACK_BUFFERS 4 -#define TSTAMP_TYPE SND_PCM_TSTAMP_TYPE_MONOTONIC +#define TSTAMP_TYPE SND_PCM_TSTAMP_TYPE_MONOTONIC_RAW
-int main(void) +int main(int argc, char *argv[]) { - int err; - unsigned int i; - snd_pcm_t *handle_p = NULL; - snd_pcm_t *handle_c = NULL; - snd_pcm_sframes_t frames; + int c; + int err; + unsigned int i; + snd_pcm_t *handle_p = NULL; + snd_pcm_t *handle_c = NULL; + snd_pcm_sframes_t frames; snd_htimestamp_t tstamp_c, tstamp_p; snd_htimestamp_t trigger_tstamp_c, trigger_tstamp_p; snd_htimestamp_t audio_tstamp_c, audio_tstamp_p; @@ -87,206 +120,292 @@ int main(void) snd_pcm_sframes_t delay_p, delay_c; snd_pcm_uframes_t avail_p, avail_c;
- if ((err = snd_pcm_open(&handle_p, device, SND_PCM_STREAM_PLAYBACK, 0)) < 0) { - printf("Playback open error: %s\n", snd_strerror(err)); - goto _exit; - } - if ((err = snd_pcm_set_params(handle_p, - SND_PCM_FORMAT_S16, - SND_PCM_ACCESS_RW_INTERLEAVED, - 2, - 48000, - 0, - 500000)) < 0) { /* 0.5sec */ - printf("Playback open error: %s\n", snd_strerror(err)); - goto _exit; + snd_pcm_audio_tstamp_config_t audio_tstamp_config_p; + snd_pcm_audio_tstamp_config_t audio_tstamp_config_c; + snd_pcm_audio_tstamp_report_t audio_tstamp_report_p; + snd_pcm_audio_tstamp_report_t audio_tstamp_report_c; + + int option_index; + static const char short_options[] = "hcpdD:t:"; + + static const struct option long_options[] = { + {"capture", 0, 0, 'c'}, + {"delay", 0, 0, 'd'}, + {"device", required_argument, 0, 'D'}, + {"help", no_argument, 0, 'h'}, + {"playback", 0, 0, 'p'}, + {"ts_type", required_argument, 0, 't'}, + {0, 0, 0, 0} + }; + + int do_delay = 0; + int do_playback = 0; + int do_capture = 0; + int type = 0; + + while ((c = getopt_long(argc, argv, short_options, long_options, &option_index)) != -1) { + switch (c) { + case 'h': + usage(command); + return 0; + case 'p': + do_playback = 1; + break; + case 'c': + do_capture = 1; + break; + case 'd': + do_delay = 1; + break; + case 'D': + pcm_name = optarg; + break; + case 't': + type = atoi(optarg); + break; + } }
- snd_pcm_hw_params_alloca(&hwparams_p); - /* get the current hwparams */ - err = snd_pcm_hw_params_current(handle_p, hwparams_p); - if (err < 0) { - printf("Unable to determine current hwparams_p: %s\n", snd_strerror(err)); - goto _exit; - } - if (snd_pcm_hw_params_supports_audio_wallclock_ts(hwparams_p)) - printf("Playback relies on audio wallclock timestamps\n"); - else - printf("Playback relies on audio sample counter timestamps\n"); - - snd_pcm_sw_params_alloca(&swparams_p); - /* get the current swparams */ - err = snd_pcm_sw_params_current(handle_p, swparams_p); - if (err < 0) { - printf("Unable to determine current swparams_p: %s\n", snd_strerror(err)); - goto _exit; - } + memset(&audio_tstamp_config_p, 0, sizeof(snd_pcm_audio_tstamp_config_t)); + memset(&audio_tstamp_config_c, 0, sizeof(snd_pcm_audio_tstamp_config_t)); + memset(&audio_tstamp_report_p, 0, sizeof(snd_pcm_audio_tstamp_report_t)); + memset(&audio_tstamp_report_c, 0, sizeof(snd_pcm_audio_tstamp_report_t));
- /* enable tstamp */ - err = snd_pcm_sw_params_set_tstamp_mode(handle_p, swparams_p, SND_PCM_TSTAMP_ENABLE); - if (err < 0) { - printf("Unable to set tstamp mode : %s\n", snd_strerror(err)); - goto _exit; - } + if (do_playback) { + if ((err = snd_pcm_open(&handle_p, pcm_name, SND_PCM_STREAM_PLAYBACK, 0)) < 0) { + printf("Playback open error: %s\n", snd_strerror(err)); + goto _exit; + }
- err = snd_pcm_sw_params_set_tstamp_type(handle_p, swparams_p, TSTAMP_TYPE); - if (err < 0) { - printf("Unable to set tstamp type : %s\n", snd_strerror(err)); - goto _exit; - } + if ((err = snd_pcm_set_params(handle_p, + SND_PCM_FORMAT_S16, + SND_PCM_ACCESS_RW_INTERLEAVED, + 2, + 48000, + 0, + 500000)) < 0) { /* 0.5sec */ + printf("Playback open error: %s\n", snd_strerror(err)); + goto _exit; + }
- /* write the sw parameters */ - err = snd_pcm_sw_params(handle_p, swparams_p); - if (err < 0) { - printf("Unable to set swparams_p : %s\n", snd_strerror(err)); - goto _exit; - } + snd_pcm_hw_params_alloca(&hwparams_p); +/* get the current hwparams */ + err = snd_pcm_hw_params_current(handle_p, hwparams_p); + if (err < 0) { + printf("Unable to determine current hwparams_p: %s\n", snd_strerror(err)); + goto _exit; + } + if (snd_pcm_hw_params_supports_audio_link_ts(hwparams_p)) + printf("Playback supports audio link timestamps\n"); + if (snd_pcm_hw_params_supports_audio_link_estimated_ts(hwparams_p)) + printf("Playback supports audio link estimated timestamps\n"); + if (snd_pcm_hw_params_supports_audio_link_synchronized_ts(hwparams_p)) + printf("Playback supports audio link synchronized timestamps\n"); + + snd_pcm_sw_params_alloca(&swparams_p); + /* get the current swparams */ + err = snd_pcm_sw_params_current(handle_p, swparams_p); + if (err < 0) { + printf("Unable to determine current swparams_p: %s\n", snd_strerror(err)); + goto _exit; + }
- if ((err = snd_pcm_open(&handle_c, device, SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK)) < 0) { - printf("Capture open error: %s\n", snd_strerror(err)); - goto _exit; - } - if ((err = snd_pcm_set_params(handle_c, - SND_PCM_FORMAT_S16, - SND_PCM_ACCESS_RW_INTERLEAVED, - 2, - 48000, - 0, - 500000)) < 0) { /* 0.5sec */ - printf("Capture open error: %s\n", snd_strerror(err)); - goto _exit; - } + /* enable tstamp */ + err = snd_pcm_sw_params_set_tstamp_mode(handle_p, swparams_p, SND_PCM_TSTAMP_ENABLE); + if (err < 0) { + printf("Unable to set tstamp mode : %s\n", snd_strerror(err)); + goto _exit; + }
- snd_pcm_hw_params_alloca(&hwparams_c); - /* get the current hwparams */ - err = snd_pcm_hw_params_current(handle_c, hwparams_c); - if (err < 0) { - printf("Unable to determine current hwparams_c: %s\n", snd_strerror(err)); - goto _exit; - } - if (snd_pcm_hw_params_supports_audio_wallclock_ts(hwparams_c)) - printf("Capture relies on audio wallclock timestamps\n"); - else - printf("Capture relies on audio sample counter timestamps\n"); - - snd_pcm_sw_params_alloca(&swparams_c); - /* get the current swparams */ - err = snd_pcm_sw_params_current(handle_c, swparams_c); - if (err < 0) { - printf("Unable to determine current swparams_c: %s\n", snd_strerror(err)); - goto _exit; - } + err = snd_pcm_sw_params_set_tstamp_type(handle_p, swparams_p, TSTAMP_TYPE); + if (err < 0) { + printf("Unable to set tstamp type : %s\n", snd_strerror(err)); + goto _exit; + }
- /* enable tstamp */ - err = snd_pcm_sw_params_set_tstamp_mode(handle_c, swparams_c, SND_PCM_TSTAMP_ENABLE); - if (err < 0) { - printf("Unable to set tstamp mode : %s\n", snd_strerror(err)); - goto _exit; - } + /* write the sw parameters */ + err = snd_pcm_sw_params(handle_p, swparams_p); + if (err < 0) { + printf("Unable to set swparams_p : %s\n", snd_strerror(err)); + goto _exit; + }
- err = snd_pcm_sw_params_set_tstamp_type(handle_c, swparams_c, TSTAMP_TYPE); - if (err < 0) { - printf("Unable to set tstamp type : %s\n", snd_strerror(err)); - goto _exit; }
- /* write the sw parameters */ - err = snd_pcm_sw_params(handle_c, swparams_c); - if (err < 0) { - printf("Unable to set swparams_c : %s\n", snd_strerror(err)); - goto _exit; + if (do_capture) { + + if ((err = snd_pcm_open(&handle_c, pcm_name, SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK)) < 0) { + printf("Capture open error: %s\n", snd_strerror(err)); + goto _exit; + } + if ((err = snd_pcm_set_params(handle_c, + SND_PCM_FORMAT_S16, + SND_PCM_ACCESS_RW_INTERLEAVED, + 2, + 48000, + 0, + 500000)) < 0) { /* 0.5sec */ + printf("Capture open error: %s\n", snd_strerror(err)); + goto _exit; + } + + snd_pcm_hw_params_alloca(&hwparams_c); + /* get the current hwparams */ + err = snd_pcm_hw_params_current(handle_c, hwparams_c); + if (err < 0) { + printf("Unable to determine current hwparams_c: %s\n", snd_strerror(err)); + goto _exit; + } + if (snd_pcm_hw_params_supports_audio_link_ts(hwparams_c)) + printf("Capture supports audio link timestamps\n"); + if (snd_pcm_hw_params_supports_audio_link_estimated_ts(hwparams_c)) + printf("Capture supports audio link estimated timestamps\n"); + if (snd_pcm_hw_params_supports_audio_link_synchronized_ts(hwparams_c)) + printf("Capture supports audio link synchronized timestamps\n"); + + snd_pcm_sw_params_alloca(&swparams_c); + /* get the current swparams */ + err = snd_pcm_sw_params_current(handle_c, swparams_c); + if (err < 0) { + printf("Unable to determine current swparams_c: %s\n", snd_strerror(err)); + goto _exit; + } + + /* enable tstamp */ + err = snd_pcm_sw_params_set_tstamp_mode(handle_c, swparams_c, SND_PCM_TSTAMP_ENABLE); + if (err < 0) { + printf("Unable to set tstamp mode : %s\n", snd_strerror(err)); + goto _exit; + } + + err = snd_pcm_sw_params_set_tstamp_type(handle_c, swparams_c, TSTAMP_TYPE); + if (err < 0) { + printf("Unable to set tstamp type : %s\n", snd_strerror(err)); + goto _exit; + } + + /* write the sw parameters */ + err = snd_pcm_sw_params(handle_c, swparams_c); + if (err < 0) { + printf("Unable to set swparams_c : %s\n", snd_strerror(err)); + goto _exit; + } }
+ if (do_playback && do_capture) { #ifdef PCM_LINK - if ((err = snd_pcm_link(handle_c, handle_p)) < 0) { - printf("Streams link error: %s\n", snd_strerror(err)); - exit(0); - } + if ((err = snd_pcm_link(handle_c, handle_p)) < 0) { + printf("Streams link error: %s\n", snd_strerror(err)); + exit(0); + } #endif - - i = PLAYBACK_BUFFERS; - while (i--) { - frames = snd_pcm_writei(handle_p, buffer_p, PERIOD); - if (frames < 0) { - printf("snd_pcm_writei failed: %s\n", snd_strerror(frames)); - goto _exit; - } - frame_count_p += frames; }
- if (PLAYBACK_BUFFERS != 4) - snd_pcm_start(handle_p); + if (do_playback) { + i = PLAYBACK_BUFFERS; + while (i--) { + frames = snd_pcm_writei(handle_p, buffer_p, PERIOD); + if (frames < 0) { + printf("snd_pcm_writei failed: %s\n", snd_strerror(frames)); + goto _exit; + } + frame_count_p += frames; + } + + if (PLAYBACK_BUFFERS != 4) + snd_pcm_start(handle_p); + }
+ if (do_capture) { #ifndef PCM_LINK - /* need to start capture explicitly */ - snd_pcm_start(handle_c); + /* need to start capture explicitly */ + snd_pcm_start(handle_c); +#else + if (!do_playback) + /* need to start capture explicitly */ + snd_pcm_start(handle_c); #endif + }
- while (1) { - - frames = snd_pcm_wait(handle_c, -1); - if (frames < 0) { - printf("snd_pcm_wait failed: %s\n", snd_strerror(frames)); - goto _exit; - } - - frames = snd_pcm_readi(handle_c, buffer_c, PERIOD); - if (frames < 0) { - printf("snd_pcm_readi failed: %s\n", snd_strerror(frames)); - goto _exit; - } - frame_count_c += frames; + while (1) {
- frames = snd_pcm_writei(handle_p, buffer_p, PERIOD); - if (frames < 0) { - printf("snd_pcm_writei failed: %s\n", snd_strerror(frames)); - goto _exit; - } + if (do_capture) {
- frame_count_p += frames; + frames = snd_pcm_wait(handle_c, -1); + if (frames < 0) { + printf("snd_pcm_wait failed: %s\n", snd_strerror(frames)); + goto _exit; + }
-#if defined(TRACK_PLAYBACK) - gettimestamp(handle_p, &tstamp_p, &trigger_tstamp_p, &audio_tstamp_p, &avail_p, &delay_p); + frames = snd_pcm_readi(handle_c, buffer_c, PERIOD); + if (frames < 0) { + printf("snd_pcm_readi failed: %s\n", snd_strerror(frames)); + goto _exit; + } + frame_count_c += frames;
+#if defined(TRACK_CAPTURE) + audio_tstamp_config_c.type_requested = type; + audio_tstamp_config_c.report_analog_delay = do_delay; + _gettimestamp(handle_c, &tstamp_c, &trigger_tstamp_c, + &audio_tstamp_c, &audio_tstamp_config_c, &audio_tstamp_report_c, + &avail_c, &delay_c); #if defined(TRACK_SAMPLE_COUNTS) - curr_count_p = frame_count_p - delay_p; /* written minus queued */ + curr_count_c = frame_count_c + delay_c; /* read plus queued */
- printf("playback: curr_count %lli driver count %lli, delta %lli\n", - (long long)curr_count_p * 1000000000LL / 48000 , - timestamp2ns(audio_tstamp_p), - (long long)curr_count_p * 1000000000LL / 48000 - timestamp2ns(audio_tstamp_p) - ); + + printf("capture: curr_count %lli driver count %lli, delta %lli\n", + (long long)curr_count_c * 1000000000LL / 48000 , + timestamp2ns(audio_tstamp_c), + (long long)curr_count_c * 1000000000LL / 48000 - timestamp2ns(audio_tstamp_c) + ); #endif
- printf("playback: systime: %lli nsec, audio time %lli nsec, \tsystime delta %lli\n", - timediff(tstamp_p, trigger_tstamp_p), - timestamp2ns(audio_tstamp_p), - timediff(tstamp_p, trigger_tstamp_p) - timestamp2ns(audio_tstamp_p) - ); + printf("\t capture: systime: %lli nsec, audio time %lli nsec, \tsystime delta %lli\n", + timediff(tstamp_c, trigger_tstamp_c), + timestamp2ns(audio_tstamp_c), + timediff(tstamp_c, trigger_tstamp_c) - timestamp2ns(audio_tstamp_c) + ); #endif + }
-#if defined(TRACK_CAPTURE) - gettimestamp(handle_c, &tstamp_c, &trigger_tstamp_c, &audio_tstamp_c, &avail_c, &delay_c); + if (do_playback) { + frames = snd_pcm_writei(handle_p, buffer_p, PERIOD); + if (frames < 0) { + printf("snd_pcm_writei failed: %s\n", snd_strerror(frames)); + goto _exit; + }
-#if defined(TRACK_SAMPLE_COUNTS) - curr_count_c = frame_count_c + delay_c; /* read plus queued */ + frame_count_p += frames; + +#if defined(TRACK_PLAYBACK)
+ audio_tstamp_config_p.type_requested = type; + audio_tstamp_config_p.report_analog_delay = do_delay; + _gettimestamp(handle_p, &tstamp_p, &trigger_tstamp_p, + &audio_tstamp_p, &audio_tstamp_config_p, &audio_tstamp_report_p, + &avail_p, &delay_p);
- printf("capture: curr_count %lli driver count %lli, delta %lli\n", - (long long)curr_count_c * 1000000000LL / 48000 , - timestamp2ns(audio_tstamp_c), - (long long)curr_count_c * 1000000000LL / 48000 - timestamp2ns(audio_tstamp_c) - ); +#if defined(TRACK_SAMPLE_COUNTS) + curr_count_p = frame_count_p - delay_p; /* written minus queued */ + + printf("playback: curr_count %lli driver count %lli, delta %lli\n", + (long long)curr_count_p * 1000000000LL / 48000 , + timestamp2ns(audio_tstamp_p), + (long long)curr_count_p * 1000000000LL / 48000 - timestamp2ns(audio_tstamp_p) + ); #endif
- printf("\t capture: systime: %lli nsec, audio time %lli nsec, \tsystime delta %lli\n", - timediff(tstamp_c, trigger_tstamp_c), - timestamp2ns(audio_tstamp_c), - timediff(tstamp_c, trigger_tstamp_c) - timestamp2ns(audio_tstamp_c) - ); + printf("playback: systime: %lli nsec, audio time %lli nsec, \tsystime delta %lli\n", + timediff(tstamp_p, trigger_tstamp_p), + timestamp2ns(audio_tstamp_p), + timediff(tstamp_p, trigger_tstamp_p) - timestamp2ns(audio_tstamp_p) + ); #endif + } +
- } + } /* while(1) */
_exit: if (handle_p)
participants (1)
-
Pierre-Louis Bossart