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lavc: Introduce AVCodec internal capabilities

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This field is designed for marking codec properties useful to lavc internals.
Two internal capabilities are added:
 - FF_CODEC_CAP_INIT_THREADSAFE: codec can be opened without locks;
 - FF_CODEC_CAP_INIT_CLEANUP: codec frees memory if initialization fails.
This commit is contained in:
Vittorio Giovara 2015-03-11 20:43:58 +00:00
parent 9993a067f6
commit 117b432748
3 changed files with 21 additions and 1 deletions
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5
libavcodec/avcodec.h
View File

@ -2924,6 +2924,11 @@ typedef struct AVCodec {
* Will be called when seeking
*/
void (*flush)(AVCodecContext *);
/**
* Internal codec capabilities.
* See FF_CODEC_CAP_* in internal.h
*/
int caps_internal;
} AVCodec;
/**

10
libavcodec/internal.h
View File

@ -33,6 +33,16 @@
#include "avcodec.h"
#include "config.h"
/**
* Codec is thread safe.
*/
#define FF_CODEC_CAP_INIT_THREADSAFE (1 << 0)
/**
* Codec cleans up memory on init failure.
*/
#define FF_CODEC_CAP_INIT_CLEANUP (1 << 1)
#define FF_SANE_NB_CHANNELS 63U
#define FF_SIGNBIT(x) (x >> CHAR_BIT * sizeof(x) - 1)

7
libavcodec/utils.c
View File

@ -1049,7 +1049,8 @@ int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *code
}
entangled_thread_counter++;
if (entangled_thread_counter != 1) {
if (entangled_thread_counter != 1 &&
!(codec->caps_internal & FF_CODEC_CAP_INIT_THREADSAFE)) {
av_log(avctx, AV_LOG_ERROR,
"Insufficient thread locking. At least %d threads are "
"calling avcodec_open2() at the same time right now.\n",
@ -1286,6 +1287,10 @@ end:
return ret;
free_and_end:
if (avctx->codec &&
(avctx->codec->caps_internal & FF_CODEC_CAP_INIT_CLEANUP))
avctx->codec->close(avctx);
av_dict_free(&tmp);
av_freep(&avctx->priv_data);
if (avctx->internal) {