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remove decoder's stop channel, frames channel is enough

--- a/decoder.c

+++ b/decoder.c

@@ -28,7 +28,6 @@

 	d->s = s;

 	d->frames = chancreate(sizeof(Frame*), 4);

 	d->finished = chancreate(sizeof(void*), 0);

-	d->stop = chancreate(sizeof(void*), 0);

 	for(i = 0; i < nelem(ops); i++){

 		if(ops[i].fmt == s->fmt){

@@ -53,7 +52,6 @@

 {

 	d->ops->close(d);

 	chanclose(d->frames);

-	sendp(d->stop, nil);

 	recvp(d->finished);

 	free(d);

 }

--- a/decoder.h

+++ b/decoder.h

@@ -5,7 +5,6 @@

 	Stream *s;

 	Channel *frames;

 	Channel *finished;

-	Channel *stop;

 	Decoderops *ops;

 	double timebase;

--- a/decoder_av1.c

+++ b/decoder_av1.c

@@ -55,7 +55,7 @@

 	lasttimestamp = 0;

 	memset(&pic, 0, sizeof(pic));

 	for(res = 0, data.sz = 0; data.sz > 0 || (res = readframe(d->s, &data)) == 0;){

-		if(nbrecvp(d->stop) != 0 || data.sz == 0)

+		if(data.sz == 0)

 			break;

 		res = dav1d_get_picture(a->c, &pic);

@@ -110,7 +110,6 @@

 	dav1d_close(&a->c);

 	free(a);

-	chanclose(d->stop);

 	c = d->finished;

 	sendp(c, nil);

 	chanclose(c);