[FFmpeg-devel] [PATCH 04/18] pthread_frame: do not share priv_data between multiple codec contexts

Anton Khirnov anton at khirnov.net
Fri Mar 13 12:28:36 EET 2020


Specifically, between the user-facing one and the first frame thread
one.

This is fragile and dangerous, allocate separate private data for each
per-thread context.
---
 libavcodec/pthread_frame.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/libavcodec/pthread_frame.c b/libavcodec/pthread_frame.c
index 2f68df384f..143fee238f 100644
--- a/libavcodec/pthread_frame.c
+++ b/libavcodec/pthread_frame.c
@@ -695,7 +695,7 @@ void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
         av_packet_unref(&p->avpkt);
         av_freep(&p->released_buffers);
 
-        if (i && p->avctx) {
+        if (p->avctx) {
             if (codec->priv_class)
                 av_opt_free(p->avctx->priv_data);
             av_freep(&p->avctx->priv_data);
@@ -805,7 +805,7 @@ int ff_frame_thread_init(AVCodecContext *avctx)
         copy->internal->thread_ctx = p;
         copy->internal->last_pkt_props = &p->avpkt;
 
-        if (i) {
+        if (codec->priv_data_size) {
             copy->priv_data = av_mallocz(codec->priv_data_size);
             if (!copy->priv_data) {
                 err = AVERROR(ENOMEM);
@@ -818,9 +818,11 @@ int ff_frame_thread_init(AVCodecContext *avctx)
                 if (err < 0)
                     goto error;
             }
-            copy->internal->is_copy = 1;
         }
 
+        if (i)
+            copy->internal->is_copy = 1;
+
         if (codec->init)
             err = codec->init(copy);
 
-- 
2.24.1



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