mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
107 lines
3.6 KiB
107 lines
3.6 KiB
/* |
|
* This file is part of FFmpeg. |
|
* |
|
* FFmpeg is free software; you can redistribute it and/or |
|
* modify it under the terms of the GNU Lesser General Public License |
|
* as published by the Free Software Foundation; either |
|
* version 2.1 of the License, or (at your option) any later version. |
|
* |
|
* FFmpeg is distributed in the hope that it will be useful, |
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
|
* GNU Lesser General Public License for more details. |
|
* |
|
* You should have received a copy of the GNU Lesser General Public License |
|
* along with FFmpeg; if not, write to the Free Software Foundation, Inc., |
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
*/ |
|
|
|
#ifndef AVUTIL_THREADMESSAGE_H |
|
#define AVUTIL_THREADMESSAGE_H |
|
|
|
typedef struct AVThreadMessageQueue AVThreadMessageQueue; |
|
|
|
typedef enum AVThreadMessageFlags { |
|
|
|
/** |
|
* Perform non-blocking operation. |
|
* If this flag is set, send and recv operations are non-blocking and |
|
* return AVERROR(EAGAIN) immediately if they can not proceed. |
|
*/ |
|
AV_THREAD_MESSAGE_NONBLOCK = 1, |
|
|
|
} AVThreadMessageFlags; |
|
|
|
/** |
|
* Allocate a new message queue. |
|
* |
|
* @param mq pointer to the message queue |
|
* @param nelem maximum number of elements in the queue |
|
* @param elsize size of each element in the queue |
|
* @return >=0 for success; <0 for error, in particular AVERROR(ENOSYS) if |
|
* lavu was built without thread support |
|
*/ |
|
int av_thread_message_queue_alloc(AVThreadMessageQueue **mq, |
|
unsigned nelem, |
|
unsigned elsize); |
|
|
|
/** |
|
* Free a message queue. |
|
* |
|
* The message queue must no longer be in use by another thread. |
|
*/ |
|
void av_thread_message_queue_free(AVThreadMessageQueue **mq); |
|
|
|
/** |
|
* Send a message on the queue. |
|
*/ |
|
int av_thread_message_queue_send(AVThreadMessageQueue *mq, |
|
void *msg, |
|
unsigned flags); |
|
|
|
/** |
|
* Receive a message from the queue. |
|
*/ |
|
int av_thread_message_queue_recv(AVThreadMessageQueue *mq, |
|
void *msg, |
|
unsigned flags); |
|
|
|
/** |
|
* Set the sending error code. |
|
* |
|
* If the error code is set to non-zero, av_thread_message_queue_send() will |
|
* return it immediately. Conventional values, such as AVERROR_EOF or |
|
* AVERROR(EAGAIN), can be used to cause the sending thread to stop or |
|
* suspend its operation. |
|
*/ |
|
void av_thread_message_queue_set_err_send(AVThreadMessageQueue *mq, |
|
int err); |
|
|
|
/** |
|
* Set the receiving error code. |
|
* |
|
* If the error code is set to non-zero, av_thread_message_queue_recv() will |
|
* return it immediately when there are no longer available messages. |
|
* Conventional values, such as AVERROR_EOF or AVERROR(EAGAIN), can be used |
|
* to cause the receiving thread to stop or suspend its operation. |
|
*/ |
|
void av_thread_message_queue_set_err_recv(AVThreadMessageQueue *mq, |
|
int err); |
|
|
|
/** |
|
* Set the optional free message callback function which will be called if an |
|
* operation is removing messages from the queue. |
|
*/ |
|
void av_thread_message_queue_set_free_func(AVThreadMessageQueue *mq, |
|
void (*free_func)(void *msg)); |
|
|
|
/** |
|
* Flush the message queue |
|
* |
|
* This function is mostly equivalent to reading and free-ing every message |
|
* except that it will be done in a single operation (no lock/unlock between |
|
* reads). |
|
*/ |
|
void av_thread_message_flush(AVThreadMessageQueue *mq); |
|
|
|
#endif /* AVUTIL_THREADMESSAGE_H */
|
|
|