[client] streaming: Don't crash if the stream creation fails

[Francois Gouget <fgouget@xxxxxxxxxxxxxxx>]

Signed-off-by: Francois Gouget <fgouget@xxxxxxxxxxxxxxx>
---

As far as I can tell there is no way to tell the server that the stream 
creation failed. So the client will still receive the video as a stream 
and won't be able to display it. But at least it will not crash.

 src/channel-display.c | 49 +++++++++++++++++++++++++++----------------------
 1 file changed, 27 insertions(+), 22 deletions(-)

diff --git a/src/channel-display.c b/src/channel-display.c
index cf9c583..c9d2710 100644
--- a/src/channel-display.c
+++ b/src/channel-display.c
@@ -109,6 +109,7 @@ static display_surface *find_surface(SpiceDisplayChannelPrivate *c, guint32 surf
 static void spice_display_channel_reset(SpiceChannel *channel, gboolean migrating);
 static void spice_display_channel_reset_capabilities(SpiceChannel *channel);
 static void destroy_canvas(display_surface *surface);
+static void destroy_stream(SpiceChannel *channel, int id);
 static void display_session_mm_time_reset_cb(SpiceSession *session, gpointer data);
 static SpiceGlScanout* spice_gl_scanout_copy(const SpiceGlScanout *scanout);
 
@@ -1114,18 +1115,18 @@ static void display_handle_stream_create(SpiceChannel *channel, SpiceMsgIn *in)
 #ifdef HAVE_BUILTIN_MJPEG
     case SPICE_VIDEO_CODEC_TYPE_MJPEG:
         st->video_decoder = create_mjpeg_decoder(op->codec_type, st);
-        break;
+        return;
 #endif
     default:
 #ifdef HAVE_GSTVIDEO
         st->video_decoder = create_gstreamer_decoder(op->codec_type, st);
+        return;
 #else
-        st->video_decoder = NULL;
+        break;
 #endif
     }
-    if (st->video_decoder == NULL) {
-        spice_printerr("could not create a video decoder for codec %u", op->codec_type);
-    }
+    spice_printerr("could not create a video decoder for codec %u", op->codec_type);
+    destroy_stream(channel, op->id);
 }
 
 static const SpiceRect *stream_get_dest(display_stream *st, SpiceMsgIn *frame_msg)
@@ -1346,6 +1347,7 @@ static void display_handle_stream_data(SpiceChannel *channel, SpiceMsgIn *in)
     g_return_if_fail(c->nstreams > op->id);
 
     st =  c->streams[op->id];
+    g_return_if_fail(st != NULL);
     mmtime = stream_get_time(st);
 
     if (spice_msg_in_type(in) == SPICE_MSG_DISPLAY_STREAM_DATA_SIZED) {
@@ -1413,6 +1415,7 @@ static void display_handle_stream_clip(SpiceChannel *channel, SpiceMsgIn *in)
     g_return_if_fail(c->nstreams > op->id);
 
     st = c->streams[op->id];
+    g_return_if_fail(st != NULL);
 
     if (st->msg_clip) {
         spice_msg_in_unref(st->msg_clip);
@@ -1439,20 +1442,21 @@ static void destroy_stream(SpiceChannel *channel, int id)
     if (!st)
         return;
 
-    num_out_frames = st->num_input_frames - st->arrive_late_count - st->num_drops_on_playback;
-    CHANNEL_DEBUG(channel, "%s: id=%d #in-frames=%u out/in=%.2f "
-        "#drops-on-receive=%u avg-late-time(ms)=%.2f "
-        "#drops-on-playback=%u", __FUNCTION__,
-        id,
-        st->num_input_frames,
-        num_out_frames / (double)st->num_input_frames,
-        st->arrive_late_count,
-        st->arrive_late_count ? st->arrive_late_time / ((double)st->arrive_late_count): 0,
-        st->num_drops_on_playback);
-    if (st->num_drops_seqs) {
-        CHANNEL_DEBUG(channel, "%s: #drops-sequences=%u ==>", __FUNCTION__, st->num_drops_seqs);
-    }
-    for (i = 0; i < st->num_drops_seqs; i++) {
+    if (st->num_input_frames) {
+        num_out_frames = st->num_input_frames - st->arrive_late_count - st->num_drops_on_playback;
+        CHANNEL_DEBUG(channel, "%s: id=%d #in-frames=%u out/in=%.2f "
+            "#drops-on-receive=%u avg-late-time(ms)=%.2f "
+            "#drops-on-playback=%u", __FUNCTION__,
+            id,
+            st->num_input_frames,
+            num_out_frames / (double)st->num_input_frames,
+            st->arrive_late_count,
+            st->arrive_late_count ? st->arrive_late_time / ((double)st->arrive_late_count): 0,
+            st->num_drops_on_playback);
+        if (st->num_drops_seqs) {
+            CHANNEL_DEBUG(channel, "%s: #drops-sequences=%u ==>", __FUNCTION__, st->num_drops_seqs);
+        }
+        for (i = 0; i < st->num_drops_seqs; i++) {
             drops_sequence_stats *stats = &g_array_index(st->drops_seqs_stats_arr,
                                                          drops_sequence_stats,
                                                          i);
@@ -1461,9 +1465,10 @@ static void destroy_stream(SpiceChannel *channel, int id)
                                    stats->len,
                                    stats->start_mm_time - st->first_frame_mm_time,
                                    stats->duration);
-    }
-    if (st->num_drops_seqs) {
-        CHANNEL_DEBUG(channel, "%s: drops-total-duration=%"G_GUINT64_FORMAT" ==>", __FUNCTION__, drops_duration_total);
+        }
+        if (st->num_drops_seqs) {
+            CHANNEL_DEBUG(channel, "%s: drops-total-duration=%"G_GUINT64_FORMAT" ==>", __FUNCTION__, drops_duration_total);
+        }
     }
 
     g_array_free(st->drops_seqs_stats_arr, TRUE);
-- 
2.8.1
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