add libcallback sources

2025-12-19 19:20:10 +00:00 · 2022-04-19 19:08:54 -07:00
parent 2dae8c85f4
commit 4444fd9ad2
4 changed files with 162 additions and 0 deletions
--- a/libcallback_avonly/audio_callback.c
+++ b/libcallback_avonly/audio_callback.c
@@ -0,0 +1,77 @@
+#define _GNU_SOURCE
+#include <dlfcn.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <tinyalsa/pcm.h>
+
+struct frames_st {
+  void *buf;
+  size_t length;
+};
+typedef int (* framecb)(struct frames_st *);
+
+static uint32_t (*real_local_sdk_audio_set_pcm_frame_callback)(int ch, void *callback);
+static void *audio_pcm_cb = NULL;
+static int AudioCaptureEnable = 1;
+
+static uint32_t audio_pcm_capture(struct frames_st *frames) {
+
+  static struct pcm *pcm = NULL;
+  static int firstEntry = 0;
+  uint32_t *buf = frames->buf;
+
+  if(!firstEntry) {
+    firstEntry++;
+    unsigned int card = 0;
+    unsigned int device = 1;
+    int flags = PCM_OUT | PCM_MMAP;
+    const struct pcm_config config = {
+      .channels = 1,
+      .rate = 16000,
+      .format = PCM_FORMAT_S16_LE,
+      .period_size = 1024,
+      .period_count = 4,
+      .start_threshold = 320,
+      .silence_threshold = 0,
+      .silence_size = 0,
+      .stop_threshold = 320 * 4
+    };
+    pcm = pcm_open(card, device, flags, &config);
+    if(pcm == NULL) {
+        fprintf(stderr, "failed to allocate memory for PCM\n");
+    } else if(!pcm_is_ready(pcm)) {
+      pcm_close(pcm);
+      fprintf(stderr, "failed to open PCM\n");
+    }
+  }
+
+  if(pcm && AudioCaptureEnable) {
+    int avail = pcm_mmap_avail(pcm);
+    int delay = pcm_get_delay(pcm);
+    int ready = pcm_is_ready(pcm);
+    int err = pcm_writei(pcm, buf, pcm_bytes_to_frames(pcm, frames->length));
+    if(err < 0) fprintf(stderr, "pcm_writei err=%d\n", err);
+  }
+  return ((framecb)audio_pcm_cb)(frames);
+}
+
+uint32_t local_sdk_audio_set_pcm_frame_callback(int ch, void *callback) {
+
+  fprintf(stderr, "local_sdk_audio_set_pcm_frame_callback streamChId=%d, callback=0x%x\n", ch, callback);
+  if(ch == 0) {
+    audio_pcm_cb = callback;
+    fprintf(stderr,"enc func injection save audio_pcm_cb=0x%x\n", audio_pcm_cb);
+    callback = audio_pcm_capture;
+  }
+  return real_local_sdk_audio_set_pcm_frame_callback(ch, callback);
+}
+
+static void __attribute ((constructor)) audio_callback_init(void) {
+
+  real_local_sdk_audio_set_pcm_frame_callback = dlsym(dlopen("/system/lib/liblocalsdk.so", RTLD_LAZY), "local_sdk_audio_set_pcm_frame_callback");
+}