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mmaldec: fix problems with flush logic 

Don't try to do a blocking wait for MMAL output if we haven't even sent
a single real packet, but only flush packets. Obviously we can't expect
to get anything back.

Additionally, don't send a flush packet to MMAL in the same case. It
appears the MMAL decoder will sometimes hang in mmal_vc_port_disable()
(called from ffmmal_close_decoder()), waiting for a reply from the GPU
which never arrives. Either MMAL disallows sending flush packets without
preceding real data, or it's a MMAL bug.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
wm4 2015-09-08 19:42:23 +02:00 committed by Luca Barbato
parent b84675d63a
commit 6b652c0273
1 changed files with 10 additions and 3 deletions
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13
libavcodec/mmaldec.c
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@ -447,8 +447,6 @@ static int ffmmal_add_packet(AVCodecContext *avctx, AVPacket *avpkt)
uint8_t *start;
int ret = 0;
ctx->packets_sent++;
if (avpkt->size) {
if (ctx->bsfc) {
uint8_t *tmp_data;
@ -474,6 +472,14 @@ static int ffmmal_add_packet(AVCodecContext *avctx, AVPacket *avpkt)
}
size = buf->size;
data = buf->data;
ctx->packets_sent++;
} else {
if (!ctx->packets_sent) {
// Short-cut the flush logic to avoid upsetting MMAL.
ctx->eos_sent = 1;
ctx->eos_received = 1;
goto done;
}
}
start = data;
@ -643,7 +649,8 @@ static int ffmmal_read_frame(AVCodecContext *avctx, AVFrame *frame, int *got_fra
// excessive buffering.
// We also wait if we sent eos, but didn't receive it yet (think of decoding
// stream with a very low number of frames).
if (ctx->frames_output || ctx->packets_sent > MAX_DELAYED_FRAMES || ctx->eos_sent) {
if (ctx->frames_output || ctx->packets_sent > MAX_DELAYED_FRAMES ||
(ctx->packets_sent && ctx->eos_sent)) {
// MMAL will ignore broken input packets, which means the frame we
// expect here may never arrive. Dealing with this correctly is
// complicated, so here's a hack to avoid that it freezes forever