android端JNI的打印信息:
#include <android/log.h>#ifndef LOG_TAG#define LOG_TAG "h264AndroidJNI"#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)#endif
转自：http://www.netmite.com/android/mydroid/system/core/liblog/logd_write.c
/* * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */#include <time.h>#include <stdio.h>#ifdef HAVE_PTHREADS#include <pthread.h>#endif#include <unistd.h>#include <errno.h>#include <fcntl.h>#include <string.h>#include <stdlib.h>#include <stdarg.h>#include <utils/logger.h>#include <cutils/logd.h>#define LOG_BUF_SIZE1024#if FAKE_LOG_DEVICE// This will be defined when building for the host.#define log_open(pathname, flags) fakeLogOpen(pathname, flags)#define log_writev(filedes, vector, count) fakeLogWritev(filedes, vector, count)#define log_close(filedes) fakeLogClose(filedes)#else#define log_open(pathname, flags) open(pathname, flags)#define log_writev(filedes, vector, count) writev(filedes, vector, count)#define log_close(filedes) close(filedes)#endiftypedef enum { LOG_ID_MAIN = 0, LOG_ID_RADIO, LOG_ID_EVENTS, LOG_ID_MAX} log_id_t;static int __write_to_log_init(log_id_t, struct iovec *vec, size_t nr);static int (*write_to_log)(log_id_t, struct iovec *vec, size_t nr) = __write_to_log_init;#ifdef HAVE_PTHREADSstatic pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER;#endifstatic int log_fds[(int)LOG_ID_MAX] = { -1, -1, -1 };/* * This is used by the C++ code to decide if it should write logs through * the C code. Basically, if /dev/log/... is available, we're running in * the simulator rather than a desktop tool and want to use the device. */static enum { kLogUninitialized, kLogNotAvailable, kLogAvailable } g_log_status = kLogUninitialized;int __android_log_dev_available(void){ if (g_log_status == kLogUninitialized) { if (access("/dev/"LOGGER_LOG_MAIN, W_OK) == 0) g_log_status = kLogAvailable; else g_log_status = kLogNotAvailable; } return (g_log_status == kLogAvailable);}static int __write_to_log_null(log_id_t log_fd, struct iovec *vec, size_t nr){ return -1;}static int __write_to_log_kernel(log_id_t log_id, struct iovec *vec, size_t nr){ ssize_t ret; int log_fd; if (/*(int)log_id >= 0 &&*/ (int)log_id < (int)LOG_ID_MAX) { log_fd = log_fds[(int)log_id]; } else { return EBADF; } do { ret = log_writev(log_fd, vec, nr); } while (ret < 0 && errno == EINTR); return ret;}static int __write_to_log_init(log_id_t log_id, struct iovec *vec, size_t nr){#ifdef HAVE_PTHREADS pthread_mutex_lock(&log_init_lock);#endif if (write_to_log == __write_to_log_init) { log_fds[LOG_ID_MAIN] = log_open("/dev/"LOGGER_LOG_MAIN, O_WRONLY); log_fds[LOG_ID_RADIO] = log_open("/dev/"LOGGER_LOG_RADIO, O_WRONLY); log_fds[LOG_ID_EVENTS] = log_open("/dev/"LOGGER_LOG_EVENTS, O_WRONLY); write_to_log = __write_to_log_kernel; if (log_fds[LOG_ID_MAIN] < 0 || log_fds[LOG_ID_RADIO] < 0 || log_fds[LOG_ID_EVENTS] < 0) { log_close(log_fds[LOG_ID_MAIN]); log_close(log_fds[LOG_ID_RADIO]); log_close(log_fds[LOG_ID_EVENTS]); log_fds[LOG_ID_MAIN] = -1; log_fds[LOG_ID_RADIO] = -1; log_fds[LOG_ID_EVENTS] = -1; write_to_log = __write_to_log_null; } }#ifdef HAVE_PTHREADS pthread_mutex_unlock(&log_init_lock);#endif return write_to_log(log_id, vec, nr);}int __android_log_write(int prio, const char *tag, const char *msg){ struct iovec vec[3]; log_id_t log_id = LOG_ID_MAIN; if (!tag) tag = ""; /* XXX: This needs to go! */ if (!strcmp(tag, "HTC_RIL") || !strcmp(tag, "RILJ") || !strcmp(tag, "RILC") || !strcmp(tag, "RIL") || !strcmp(tag, "AT") || !strcmp(tag, "GSM") || !strcmp(tag, "STK")) log_id = LOG_ID_RADIO; vec[0].iov_base = (unsigned char *) &prio; vec[0].iov_len = 1; vec[1].iov_base = (void *) tag; vec[1].iov_len = strlen(tag) + 1; vec[2].iov_base = (void *) msg; vec[2].iov_len = strlen(msg) + 1; return write_to_log(log_id, vec, 3);}int __android_log_vprint(int prio, const char *tag, const char *fmt, va_list ap){ char buf[LOG_BUF_SIZE]; vsnprintf(buf, LOG_BUF_SIZE, fmt, ap); return __android_log_write(prio, tag, buf);}int __android_log_print(int prio, const char *tag, const char *fmt, ...){ va_list ap; char buf[LOG_BUF_SIZE]; va_start(ap, fmt); vsnprintf(buf, LOG_BUF_SIZE, fmt, ap); va_end(ap); return __android_log_write(prio, tag, buf);}void __android_log_assert(const char *cond, const char *tag, const char *fmt, ...){ va_list ap; char buf[LOG_BUF_SIZE]; va_start(ap, fmt); vsnprintf(buf, LOG_BUF_SIZE, fmt, ap); va_end(ap); __android_log_write(ANDROID_LOG_FATAL, tag, buf); __builtin_trap(); /* trap so we have a chance to debug the situation */}int __android_log_bwrite(int32_t tag, const void *payload, size_t len){ struct iovec vec[2]; vec[0].iov_base = &tag; vec[0].iov_len = sizeof(tag); vec[1].iov_base = (void*)payload; vec[1].iov_len = len; return write_to_log(LOG_ID_EVENTS, vec, 2);}/* * Like __android_log_bwrite, but takes the type as well. Doesn't work * for the general case where we're generating lists of stuff, but very * handy if we just want to dump an integer into the log. */int __android_log_btwrite(int32_t tag, char type, const void *payload, size_t len){ struct iovec vec[3]; vec[0].iov_base = &tag; vec[0].iov_len = sizeof(tag); vec[1].iov_base = &type; vec[1].iov_len = sizeof(type); vec[2].iov_base = (void*)payload; vec[2].iov_len = len; return write_to_log(LOG_ID_EVENTS, vec, 3);}syntax highlighted by Code2HTML, v. 0.9.1
