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avcodec: add ff_lock/unlock_avcodec functions.

Browse Source 
Will be used in future patches, together with the
variable that allows checking whether the lock is held.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
This commit is contained in:
Reimar Döffinger 2012-11-27 21:56:35 +01:00
parent 5381960501
commit 25fec8595d
2 changed files with 44 additions and 56 deletions
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4
libavcodec/internal.h
View File

@ -129,6 +129,10 @@ void ff_init_buffer_info(AVCodecContext *s, AVFrame *frame);
*/
void ff_packet_free_side_data(AVPacket *pkt);
extern volatile int ff_avcodec_locked;
int ff_lock_avcodec(AVCodecContext *log_ctx);
int ff_unlock_avcodec(void);
int avpriv_lock_avformat(void);
int avpriv_unlock_avformat(void);

96
libavcodec/utils.c
View File

@ -47,6 +47,7 @@
#include <limits.h>
#include <float.h>
volatile int ff_avcodec_locked;
static int volatile entangled_thread_counter = 0;
static int (*ff_lockmgr_cb)(void **mutex, enum AVLockOp op);
static void *codec_mutex;
@ -766,20 +767,11 @@ int attribute_align_arg ff_codec_open2_recursive(AVCodecContext *avctx, const AV
{
int ret = 0;
entangled_thread_counter--;
/* Release any user-supplied mutex. */
if (ff_lockmgr_cb) {
(*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
}
ff_unlock_avcodec();
ret = avcodec_open2(avctx, codec, options);
/* If there is a user-supplied mutex locking routine, call it. */
if (ff_lockmgr_cb) {
if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
return -1;
}
entangled_thread_counter++;
ff_lock_avcodec(avctx);
return ret;
}
@ -809,18 +801,9 @@ int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *code
if (options)
av_dict_copy(&tmp, *options, 0);
/* If there is a user-supplied mutex locking routine, call it. */
if (ff_lockmgr_cb) {
if ((ret = (*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN)) < 0)
return ret;
}
entangled_thread_counter++;
if (entangled_thread_counter != 1) {
av_log(avctx, AV_LOG_ERROR, "Insufficient thread locking around avcodec_open/close()\n");
ret = AVERROR(EINVAL);
ret = ff_lock_avcodec(avctx);
if (ret < 0)
goto end;
}
avctx->internal = av_mallocz(sizeof(AVCodecInternal));
if (!avctx->internal) {
@ -1059,12 +1042,7 @@ int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *code
}
}
end:
entangled_thread_counter--;
/* Release any user-supplied mutex. */
if (ff_lockmgr_cb) {
(*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
}
ff_unlock_avcodec();
if (options) {
av_dict_free(options);
*options = tmp;
@ -1880,37 +1858,19 @@ av_cold int ff_codec_close_recursive(AVCodecContext *avctx)
{
int ret = 0;
entangled_thread_counter--;
/* Release any user-supplied mutex. */
if (ff_lockmgr_cb) {
(*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
}
ff_unlock_avcodec();
ret = avcodec_close(avctx);
/* If there is a user-supplied mutex locking routine, call it. */
if (ff_lockmgr_cb) {
if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
return -1;
}
entangled_thread_counter++;
ff_lock_avcodec(NULL);
return ret;
}
av_cold int avcodec_close(AVCodecContext *avctx)
{
/* If there is a user-supplied mutex locking routine, call it. */
if (ff_lockmgr_cb) {
if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
return -1;
}
entangled_thread_counter++;
if (entangled_thread_counter != 1) {
av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
entangled_thread_counter--;
return -1;
}
int ret = ff_lock_avcodec(avctx);
if (ret < 0)
return ret;
if (avcodec_is_open(avctx)) {
if (HAVE_THREADS && avctx->internal->frame_thread_encoder && avctx->thread_count > 1) {
@ -1938,12 +1898,8 @@ av_cold int avcodec_close(AVCodecContext *avctx)
av_freep(&avctx->extradata);
avctx->codec = NULL;
avctx->active_thread_type = 0;
entangled_thread_counter--;
/* Release any user-supplied mutex. */
if (ff_lockmgr_cb) {
(*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
}
ff_unlock_avcodec();
return 0;
}
@ -2590,6 +2546,34 @@ int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op))
return 0;
}
int ff_lock_avcodec(AVCodecContext *log_ctx)
{
if (ff_lockmgr_cb) {
if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
return -1;
}
entangled_thread_counter++;
if (entangled_thread_counter != 1) {
av_log(log_ctx, AV_LOG_ERROR, "Insufficient thread locking around avcodec_open/close()\n");
return AVERROR(EINVAL);
}
av_assert0(!ff_avcodec_locked);
ff_avcodec_locked = 1;
return 0;
}
int ff_unlock_avcodec(void)
{
av_assert0(ff_avcodec_locked);
ff_avcodec_locked = 0;
entangled_thread_counter--;
if (ff_lockmgr_cb) {
if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE))
return -1;
}
return 0;
}
int avpriv_lock_avformat(void)
{
if (ff_lockmgr_cb) {