On 08/25/2017 05:35 PM, wm4 wrote:
+int avpriv_v4l2m2m_reinit(V4L2Context* ctx)
+{
+ V4L2m2mContext *s = container_of(ctx, V4L2m2mContext, capture);
+ int ret;
+
+ av_log(ctx->log_ctx, AV_LOG_DEBUG, "%s reinit context\n", ctx->name);
+
+ /* 1. streamoff */
+ ret = avpriv_v4l2_context_set_status(ctx, VIDIOC_STREAMOFF);
+ if (ret)
+ av_log(ctx->log_ctx, AV_LOG_ERROR, "VIDIOC_STREAMOFF %s\n", ctx->name);
+
+ /* 2. unmap the buffers (v4l2 and ffmpeg) */
+ avpriv_v4l2_context_release(ctx);
What happens to AVFrames or AVPackets that are still referenced?
yes in response to your previous comment on the subject, I am trying to
address that in v7 not releasing the context while there are buffers on
the fly....
This is what I came up with (if you can suggest something better - ie, a
way to block until the AVBufferRefs are unref- please let me know)
void avpriv_v4l2_context_release(V4L2Context* ctx)
{
int i, ret;
if (!ctx->buffers)
return;
/* wait until all buffers are no longer in use */
for (i = 0; i < ctx->num_buffers; i++) {
if (ctx->buffers[i].status & (V4L2BUF_IN_DRIVER |
V4L2BUF_AVAILABLE))
continue;
while (ctx->buffers[i].status & V4L2BUF_RET_USER)
usleep(100);
}
ret = ctx->ops.release_buffers(ctx);
if (ret)
av_log(ctx->log_ctx, AV_LOG_WARNING, "V4L2 failed to unmap the
%s buffers\n", ctx->name);
else
av_log(ctx->log_ctx, AV_LOG_DEBUG, "%s buffers unmapped\n",
ctx->name);
av_free(ctx->buffers);
ctx->buffers = NULL;
ctx->num_queued = 0;
}
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