V4L/DVB (5916): ivtv: fix pause/continue/play handling

Pausing a decoder followed by a Play command would do nothing. Fixed.
Pausing a decoder running at non-standard speed following by a Continue
would reset the speed to 100%. Fixed.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/ivtv/ivtv-driver.h

@@ -417,6 +417,7 @@ struct ivtv_mailbox_data {
 #define IVTV_F_I_WORK_HANDLER_YUV  17	/* there is work to be done for YUV */
 #define IVTV_F_I_WORK_HANDLER_PIO  18	/* there is work to be done for PIO */
 #define IVTV_F_I_PIO		   19	/* PIO in progress */
+#define IVTV_F_I_DEC_PAUSED	   20 	/* the decoder is paused */
 
 /* Event notifications */
 #define IVTV_F_I_EV_DEC_STOPPED	   28	/* decoder stopped event */

drivers/media/video/ivtv/ivtv-fileops.c

@@ -757,6 +757,7 @@ static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
 	    itv->output_mode = OUT_NONE;
 
 	itv->speed = 0;
+	clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
 	ivtv_release_stream(s);
 }
 

drivers/media/video/ivtv/ivtv-ioctl.c

@@ -285,6 +285,10 @@ static int ivtv_video_command(struct ivtv *itv, struct ivtv_open_id *id,
 
 		if (ivtv_set_output_mode(itv, OUT_MPG) != OUT_MPG)
 			return -EBUSY;
+		if (test_and_clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags)) {
+			/* forces ivtv_set_speed to be called */
+			itv->speed = 0;
+		}
 		return ivtv_start_decoding(id, vc->play.speed);
 	}
 
@@ -309,6 +313,7 @@ static int ivtv_video_command(struct ivtv *itv, struct ivtv_open_id *id,
 		if (atomic_read(&itv->decoding) > 0) {
 			ivtv_vapi(itv, CX2341X_DEC_PAUSE_PLAYBACK, 1,
 				(vc->flags & VIDEO_CMD_FREEZE_TO_BLACK) ? 1 : 0);
+			set_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
 		}
 		break;
 
@@ -317,8 +322,10 @@ static int ivtv_video_command(struct ivtv *itv, struct ivtv_open_id *id,
 		if (try) break;
 		if (itv->output_mode != OUT_MPG)
 			return -EBUSY;
-		if (atomic_read(&itv->decoding) > 0) {
-			ivtv_vapi(itv, CX2341X_DEC_START_PLAYBACK, 2, 0, 0);
+		if (test_and_clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags)) {
+			int speed = itv->speed;
+			itv->speed = 0;
+			return ivtv_start_decoding(id, speed);
 		}
 		break;