整理代码

2026-09-28 21:33:04 +08:00 · 2026-09-28 21:33:04 +08:00 · c7b4e178ec
commit c7b4e178ec
364 changed files with 59691 additions and 0 deletions
--- a/video/alsa/PCM.cpp
+++ b/video/alsa/PCM.cpp
@ -0,0 +1,144 @@
+/*
+ *******************************************************************************
+ *                                   INCLUDE
+ *******************************************************************************
+ */
+#include "PCM.h"
+#include <alsa/asoundlib.h>
+#include <iostream>
+
+namespace Video
+{
+namespace ALSA
+{
+/*
+ *******************************************************************************
+ *                                CLASS DEFINE
+ *******************************************************************************
+ */
+PCM::PCM()
+{
+}
+
+PCM::~PCM()
+{
+}
+
+int PCM::open(SoundCard::Ptr pSoundCard, snd_pcm_stream_t stream)
+{
+    _stream = stream;
+    return snd_pcm_open((snd_pcm_t**)&_pPCM, pSoundCard->info().device.c_str(), stream, 0);
+}
+
+int PCM::close()
+{
+    snd_pcm_drain((snd_pcm_t*)_pPCM);
+    snd_pcm_close((snd_pcm_t*)_pPCM);
+    return 0;
+}
+
+int PCM::config(snd_pcm_access_t access, snd_pcm_format_t format, int channels, int rate, int framesz, int samplesz)
+{
+#define __check_error(x) \
+    rc = x; \
+    if (rc < 0) \
+    { \
+        std::cout << "Error: " << snd_strerror(rc) << "@" << #x << std::endl; \
+        goto out; \
+    }
+
+    snd_pcm_hw_params_t* hwParams = nullptr;
+    snd_pcm_sw_params_t* swParams = nullptr;
+    int                  rc;
+
+    __check_error(snd_pcm_hw_params_malloc(&hwParams));
+
+    __check_error(snd_pcm_hw_params_any((snd_pcm_t*)_pPCM, hwParams));
+
+    __check_error(snd_pcm_hw_params_set_access((snd_pcm_t*)_pPCM, hwParams, access));
+
+    __check_error(snd_pcm_hw_params_set_format((snd_pcm_t*)_pPCM, hwParams, format));
+
+    __check_error(snd_pcm_hw_params_set_channels((snd_pcm_t*)_pPCM, hwParams, channels));
+
+    __check_error(snd_pcm_hw_params_set_rate((snd_pcm_t*)_pPCM, hwParams, rate, 0));
+
+    __check_error(snd_pcm_hw_params_set_period_size((snd_pcm_t*)_pPCM, hwParams, framesz, 0));
+
+    __check_error(snd_pcm_hw_params_set_periods((snd_pcm_t*)_pPCM, hwParams, samplesz, 0));
+
+    __check_error(snd_pcm_hw_params_set_buffer_size((snd_pcm_t*)_pPCM, hwParams, samplesz * framesz));
+
+    __check_error(snd_pcm_hw_params((snd_pcm_t*)_pPCM, hwParams));
+
+    if (_stream == SND_PCM_STREAM_PLAYBACK)
+    {
+        __check_error(snd_pcm_sw_params_malloc(&swParams));
+        __check_error(snd_pcm_sw_params_current((snd_pcm_t*)_pPCM, swParams));
+        __check_error(snd_pcm_sw_params_set_avail_min((snd_pcm_t*)_pPCM, swParams, framesz));
+
+        __check_error(snd_pcm_sw_params_set_start_threshold((snd_pcm_t*)_pPCM, swParams, framesz * samplesz));
+        __check_error(snd_pcm_sw_params((snd_pcm_t*)_pPCM, swParams));
+    }
+
+out:
+    if (hwParams)
+        snd_pcm_hw_params_free(hwParams);
+
+    if (swParams)
+        snd_pcm_sw_params_free(swParams);
+
+    return rc;
+}
+
+int PCM::write(const void* data, uint32_t framesz)
+{
+    int rc = snd_pcm_writei((snd_pcm_t*)_pPCM, data, framesz);
+    if (rc < 0)
+    {
+        if (rc == -EPIPE)
+            rc = snd_pcm_prepare((snd_pcm_t*)_pPCM);
+    }
+
+    return rc;
+}
+
+int PCM::write(void** datas, uint32_t framesz)
+{
+    int rc = snd_pcm_writen((snd_pcm_t*)_pPCM, datas, framesz);
+    if (rc < 0)
+    {
+        if (rc == -EPIPE)
+            rc = snd_pcm_prepare((snd_pcm_t*)_pPCM);
+    }
+
+    return rc;
+}
+
+int PCM::read(void* buffer, uint32_t framesz)
+{
+    int rc = snd_pcm_readi((snd_pcm_t*)_pPCM, buffer, (snd_pcm_uframes_t)framesz);
+    if (rc < 0)
+    {
+        std::cout << "ALSA error: " << rc << " -> " << snd_strerror(rc) << "@" << framesz << std::endl;
+        if (rc == -EPIPE)
+            rc = snd_pcm_prepare((snd_pcm_t*)_pPCM);
+    }
+
+    return rc;
+}
+
+int PCM::read(void** buffers, uint32_t framesz)
+{
+    int rc = snd_pcm_readn((snd_pcm_t*)_pPCM, buffers, (snd_pcm_uframes_t)framesz);
+    if (rc < 0)
+    {
+        std::cout << "ALSA error: " << rc << " -> " << snd_strerror(rc) << "@" << framesz << std::endl;
+        if (rc == -EPIPE)
+            rc = snd_pcm_prepare((snd_pcm_t*)_pPCM);
+    }
+
+    return rc;
+}
+}
+}