标签：android framework 移植 调试 audio
disable tstamp for wm8904.
Change-Id: Ia22aa6ed39ede6214657487344d0488be93e5544
diff --git a/pcm.c b/pcm.c
index 4501777..94cf6ee 100644
--- a/pcm.c
+++ b/pcm.c
@@ -691,7 +691,7 @@ struct pcm *pcm_open(unsigned int card, unsigned int device,
memset(&sparams, 0, sizeof(sparams));
- sparams.tstamp_mode = SNDRV_PCM_TSTAMP_ENABLE;
+ sparams.tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
sparams.period_step = 1;
if (!config->start_threshold) {static inline int audio_hw_device_open(const struct hw_module_t* module,
struct audio_hw_device** device)
{
return module->methods->open(module, AUDIO_HARDWARE_INTERFACE,
(struct hw_device_t**)device);
}
static inline int audio_hw_device_close(struct audio_hw_device* device)
{
return device->common.close(&device->common);
}/* Open and close a stream */
struct pcm *pcm_open(unsigned int card, unsigned int device,
unsigned int flags, struct pcm_config *config);
int pcm_close(struct pcm *pcm);
int pcm_is_ready(struct pcm *pcm);
/* Obtain the parameters for a PCM */
struct pcm_params *pcm_params_get(unsigned int card, unsigned int device,
unsigned int flags);
void pcm_params_free(struct pcm_params *pcm_params);
unsigned int pcm_params_get_min(struct pcm_params *pcm_params,
enum pcm_param param);
unsigned int pcm_params_get_max(struct pcm_params *pcm_params,
enum pcm_param param);
/* Set and get config */
int pcm_get_config(struct pcm *pcm, struct pcm_config *config);
int pcm_set_config(struct pcm *pcm, struct pcm_config *config);
/* Returns a human readable reason for the last error */
const char *pcm_get_error(struct pcm *pcm);
/* Returns the sample size in bits for a PCM format.
* As with ALSA formats, this is the storage size for the format, whereas the
* format represents the number of significant bits. For example,
* PCM_FORMAT_S24_LE uses 32 bits of storage.
*/
unsigned int pcm_format_to_bits(enum pcm_format format);
/* Returns the buffer size (int frames) that should be used for pcm_write. */
unsigned int pcm_get_buffer_size(struct pcm *pcm);
unsigned int pcm_frames_to_bytes(struct pcm *pcm, unsigned int frames);
unsigned int pcm_bytes_to_frames(struct pcm *pcm, unsigned int bytes);
/* Returns the pcm latency in ms */
unsigned int pcm_get_latency(struct pcm *pcm);
/* Returns available frames in pcm buffer and corresponding time stamp.
* The clock is CLOCK_MONOTONIC if flag PCM_MONOTONIC was specified in pcm_open,
* otherwise the clock is CLOCK_REALTIME.
* For an input stream, frames available are frames ready for the
* application to read.
* For an output stream, frames available are the number of empty frames available
* for the application to write.
*/
int pcm_get_htimestamp(struct pcm *pcm, unsigned int *avail,
struct timespec *tstamp);
/* Write data to the fifo.
* Will start playback on the first write or on a write that
* occurs after a fifo underrun.
*/
int pcm_write(struct pcm *pcm, const void *data, unsigned int count);
int pcm_read(struct pcm *pcm, void *data, unsigned int count);
/*
* mmap() support.
*/
int pcm_mmap_write(struct pcm *pcm, const void *data, unsigned int count);
int pcm_mmap_read(struct pcm *pcm, void *data, unsigned int count);
int pcm_mmap_begin(struct pcm *pcm, void **areas, unsigned int *offset,
unsigned int *frames);
int pcm_mmap_commit(struct pcm *pcm, unsigned int offset, unsigned int frames);
/* Start and stop a PCM channel that doesn't transfer data */
int pcm_start(struct pcm *pcm);
int pcm_stop(struct pcm *pcm);
/* Interrupt driven API */
int pcm_wait(struct pcm *pcm, int timeout);
/* Change avail_min after the stream has been opened with no need to stop the stream.
* Only accepted if opened with PCM_MMAP and PCM_NOIRQ flags
*/
int pcm_set_avail_min(struct pcm *pcm, int avail_min);root@sama5d3:/ # tinymix Mixer name: 'wm8904 @ SAMA5D3EK' Number of controls: 41 ctl type num name value 0 INT 1 EQ1 Volume 12 1 INT 1 EQ2 Volume 12 2 INT 1 EQ3 Volume 12 3 INT 1 EQ4 Volume 12 4 INT 1 EQ5 Volume 12 5 INT 2 Digital Capture Volume 96 96 6 ENUM 1 Left Caputure Mode Single-Ended 7 ENUM 1 Right Capture Mode Single-Ended 8 INT 2 Capture Volume 5 5 9 BOOL 2 Capture Switch Off Off 10 BOOL 1 High Pass Filter Switch On 11 ENUM 1 High Pass Filter Mode Hi-fi 12 BOOL 1 ADC 128x OSR Switch On 13 INT 1 Digital Playback Boost Volume 0 14 INT 2 Digital Playback Volume 96 96 15 INT 2 Headphone Volume 45 45 16 BOOL 2 Headphone Switch On On 17 BOOL 2 Headphone ZC Switch On On 18 INT 2 Line Output Volume 57 57 19 BOOL 2 Line Output Switch On On 20 BOOL 2 Line Output ZC Switch On On 21 BOOL 1 EQ Switch Off 22 BOOL 1 DRC Switch Off 23 ENUM 1 DRC Path ADC 24 BOOL 1 DAC OSRx2 Switch Off 25 BOOL 1 DAC Deemphasis Switch Off 26 INT 2 Digital Sidetone Volume 0 0 27 ENUM 1 LINER Mux DAC 28 ENUM 1 LINEL Mux DAC 29 ENUM 1 HPR Mux DAC 30 ENUM 1 HPL Mux DAC 31 ENUM 1 Right Sidetone None 32 ENUM 1 Left Sidetone None 33 ENUM 1 DACR Mux Right 34 ENUM 1 DACL Mux Left 35 ENUM 1 AIFOUTR Mux Right 36 ENUM 1 AIFOUTL Mux Left 37 ENUM 1 Right Capture Inverting Mux IN1R 38 ENUM 1 Right Capture Mux IN2R 39 ENUM 1 Left Capture Inverting Mux IN1L 40 ENUM 1 Left Capture Mux IN2L
Android 4.4 Kitkat 音频实现及简要分析,布布扣,bubuko.com
标签：android framework 移植 调试 audio
原文地址：http://blog.csdn.net/jingxia2008/article/details/26701899
