仿做唯品会网站,服务器做内网网站,全国建设市场公共服务网站,wordpress眉顶布局我们经常会遇到这样的问题#xff0c;应用读取到的音频有问题#xff0c;需要在tinyalsa里面读取音频来确认是底层音频有问题#xff0c;还是应用处理之后存在的问题。所以#xff0c;这个patch就出现了代码的逻辑很简单#xff0c;主要是在pcm_read的时候#xff0c;同时… 我们经常会遇到这样的问题应用读取到的音频有问题需要在tinyalsa里面读取音频来确认是底层音频有问题还是应用处理之后存在的问题。所以这个patch就出现了代码的逻辑很简单主要是在pcm_read的时候同时把这个数据写入一个文件里面这个只能在调试的时候使用如果一直使用会导致这个文件会一直变大到最后系统因为没有存储出现问题的。现在写android代码已经不使用android.mk了代替它的是android.bp如果需要包含头文件也需要在这里面修改。相关的文章网上一箩筐我就不说了。有个指针的处理我觉得是比较巧妙的大家如果喜欢研究代码的话欢迎去github看看源码。如果对代码还是不理解可以去看看tinycap.c里面的解析录音操作虽然简单但是对我们帮助挺大的。代码修改的diff如下diff --git a/external/tinyalsa/Android.bp b/external/tinyalsa/Android.bp
old mode 100644
new mode 100755
index 090d91c0f8..79a6ceaee2
--- a/external/tinyalsa/Android.bpb/external/tinyalsa/Android.bp-9,6 9,7 cc_library {mixer.c,pcm.c,],shared_libs: [liblog],cflags: [-Werror, -Wno-macro-redefined],export_include_dirs: [include],local_include_dirs: [include],
diff --git a/external/tinyalsa/pcm.c b/external/tinyalsa/pcm.c
old mode 100644
new mode 100755
index 4ae321bf93..de0deab9d0
--- a/external/tinyalsa/pcm.cb/external/tinyalsa/pcm.c-35,11 35,17 #include unistd.h#include poll.h#include stdint.h
#include signal.h
#include time.h
#include sys/ioctl.h#include sys/mman.h#include sys/time.h#include limits.h#include android/log.h
#include linux/ioctl.h#define __force#define __bitwise-48,6 54,10 #include tinyalsa/asoundlib.h#define LOG_TAG TINYALSA_QIFA
#define ALOGD(fmt, args...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, fmt, ##args)
#define ALOGE(fmt, args...) __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, fmt, ##args)
#define PARAM_MAX SNDRV_PCM_HW_PARAM_LAST_INTERVAL/* Logs information into a string; follows snprintf() in that-242,6 252,10 static void param_init(struct snd_pcm_hw_params *p)struct pcm {int fd;//int fd_test;FILE *fd_test;unsigned int size_test;void *test_buffer;unsigned int flags;int running:1;int prepared:1;-566,6 580,7 int pcm_read(struct pcm *pcm, void *data, unsigned int count)x.frames count / (pcm-config.channels *pcm_format_to_bits(pcm-config.format) / 8); ALOGE(x.frames:%ld count:%d,x.frames,count);for (;;) {if (!pcm-running) {if (pcm_start(pcm) 0) {-583,6 598,12 int pcm_read(struct pcm *pcm, void *data, unsigned int count)}return oops(pcm, errno, cannot read stream data);}if (fwrite(x.buf, 1, count, pcm-fd_test) ! count) {fprintf(stderr,Error capturing sample\n);ALOGE(Error capturing sample);}
return 0;}}-864,6 885,8 int pcm_close(struct pcm *pcm)if (pcm-fd 0)close(pcm-fd);if (pcm-fd_test 0)fclose(pcm-fd_test);pcm-prepared 0;pcm-running 0;pcm-buffer_size 0;-872,6 895,8 int pcm_close(struct pcm *pcm)return 0;}
struct pcm *pcm_open(unsigned int card, unsigned int device,unsigned int flags, struct pcm_config *config){-900,7 925,12 struct pcm *pcm_open(unsigned int card, unsigned int device,oops(pcm, errno, cannot open device %s, fn);return pcm;}
-/*weiqifa*/pcm-fd_test fopen(/sdcard/ref_temp.pcm, wb);if (!pcm-fd_test) {fprintf(stderr, Unable to create file /sdcard/ref_temp.pcm\n);} else ALOGD(creat /sdcard/ref_temp.pcm file success);
if (fcntl(pcm-fd, F_SETFL, fcntl(pcm-fd, F_GETFL) ~O_NONBLOCK) 0) {oops(pcm, errno, failed to reset blocking mode %s, fn);
(END)int running:1;int prepared:1;-566,6 580,7 int pcm_read(struct pcm *pcm, void *data, unsigned int count )x.frames count / (pcm-config.channels *pcm_format_to_bits(pcm-config.format) / 8); ALOGE(x.frames:%ld count:%d,x.frames,count);for (;;) {if (!pcm-running) {if (pcm_start(pcm) 0) {-583,6 598,12 int pcm_read(struct pcm *pcm, void *data, unsigned int coun t)}return oops(pcm, errno, cannot read stream data);}if (fwrite(x.buf, 1, count, pcm-fd_test) ! count) {fprintf(stderr,Error capturing sample\n);ALOGE(Error capturing sample);}
return 0;
:int running:1;int prepared:1;-566,6 580,7 int pcm_read(struct pcm *pcm, void *data, unsigned int count)x.frames count / (pcm-config.channels *pcm_format_to_bits(pcm-config.format) / 8); ALOGE(x.frames:%ld count:%d,x.frames,count);for (;;) {if (!pcm-running) {if (pcm_start(pcm) 0) {-583,6 598,12 int pcm_read(struct pcm *pcm, void *data, unsigned int count)}return oops(pcm, errno, cannot read stream data);}if (fwrite(x.buf, 1, count, pcm-fd_test) ! count) {fprintf(stderr,Error capturing sample\n);ALOGE(Error capturing sample);}
return 0;}}-864,6 885,8 int pcm_close(struct pcm *pcm)if (pcm-fd 0)close(pcm-fd);if (pcm-fd_test 0)fclose(pcm-fd_test);pcm-prepared 0;pcm-running 0;pcm-buffer_size 0;-872,6 895,8 int pcm_close(struct pcm *pcm)return 0;}
struct pcm *pcm_open(unsigned int card, unsigned int device,unsigned int flags, struct pcm_config *config){-900,7 925,12 struct pcm *pcm_open(unsigned int card, unsigned int device,oops(pcm, errno, cannot open device %s, fn);return pcm;}
-/*weiqifa*/pcm-fd_test fopen(/sdcard/ref_temp.pcm, wb);if (!pcm-fd_test) {fprintf(stderr, Unable to create file /sdcard/ref_temp.pcm\n);} else ALOGD(creat /sdcard/ref_temp.pcm file success);
if (fcntl(pcm-fd, F_SETFL, fcntl(pcm-fd, F_GETFL) ~O_NONBLOCK) 0) {oops(pcm, errno, failed to reset blocking mode %s, fn);
weiqifabsp-ubuntu1804:~/is13-sdk$核心代码在pcm.c里面int pcm_read(struct pcm *pcm, void *data, unsigned int count)
{struct snd_xferi x;if (!(pcm-flags PCM_IN))return -EINVAL;x.buf data;x.frames count / (pcm-config.channels *pcm_format_to_bits(pcm-config.format) / 8);ALOGE(x.frames:%ld count:%d,x.frames,count);for (;;) {if (!pcm-running) {if (pcm_start(pcm) 0) {fprintf(stderr, start error);return -errno;}}if (ioctl(pcm-fd, SNDRV_PCM_IOCTL_READI_FRAMES, x)) {pcm-prepared 0;pcm-running 0;if (errno EPIPE) {/* we failed to make our window -- try to restart */pcm-underruns;continue;}return oops(pcm, errno, cannot read stream data);}if (fwrite(x.buf, 1, count, pcm-fd_test) ! count) {fprintf(stderr,Error capturing sample\n);ALOGE(Error capturing sample);}return 0;}
}x.buf 是一个指针但是这个指针用的是从应用程序传下来的地址所以在这里面也不需要给 x.buf分配空间具体可以参考tinycap的做法。在tinycap还会给音频文件写入一个header我们这里没有写入没有太大的关系打开音频的时候直接导入原始音频就可以了。xxx:/ # ls -al /sdcard/ref_temp.pcm
-rw-rw---- 1 root sdcard_rw 79298560 2021-01-08 15:24 /sdcard/ref_temp.pcm
xxx:/ #
完整代码如下https://github.com/weiqifa0/tinyalsa
