obs-ffmpeg: Fix potential seek issues with media source

(This commit also modifies deps/media-playback)

Before, the media-playback library would detect whether something was
seekable by checking the filename for "://", which is unideal because
there are other cases where targets may not be seekable.  So instead, an
explicit "seekable" property (off by default) is now in place in the
media source when not in "local file" mode.  Seeking will only be
enabled if local file mode is on, or if "seekable" is explicitly checked
by the user.

Closes jp9000/obs-studio#1022

deps/media-playback/media-playback/media.c

@@ -357,7 +357,7 @@ static void mp_media_next_video(mp_media_t *m, bool preload)
 	frame->height = f->height;
 	frame->flip = flip;
 
-	if (m->is_network && !d->got_first_keyframe) {
+	if (!m->is_local_file && !d->got_first_keyframe) {
 		if (!f->key_frame)
 			return;
 
@@ -407,18 +407,17 @@ static bool mp_media_reset(mp_media_t *m)
 		? av_rescale_q(seek_pos, AV_TIME_BASE_Q, stream->time_base)
 		: seek_pos;
 
-	if (!m->is_network && !m->is_concat) {
+	if (m->is_local_file) {
 		int ret = av_seek_frame(m->fmt, 0, seek_target, seek_flags);
 		if (ret < 0) {
 			blog(LOG_WARNING, "MP: Failed to seek: %s",
 					av_err2str(ret));
-			return false;
 		}
 	}
 
-	if (m->has_video && !m->is_network)
+	if (m->has_video && m->is_local_file)
 		mp_decode_flush(&m->v);
-	if (m->has_audio && !m->is_network)
+	if (m->has_audio && m->is_local_file)
 		mp_decode_flush(&m->a);
 
 	int64_t next_ts = mp_media_get_base_pts(m);
@@ -448,7 +447,7 @@ static bool mp_media_reset(mp_media_t *m)
 		m->next_ns = 0;
 	}
 
-	if (!active && !m->is_network && m->v_preload_cb)
+	if (!active && m->is_local_file && m->v_preload_cb)
 		mp_media_next_video(m, true);
 	if (stopping && m->stop_cb)
 		m->stop_cb(m->opaque);
@@ -528,7 +527,7 @@ static bool init_avformat(mp_media_t *m)
 	}
 
 	AVDictionary *opts = NULL;
-	if (m->buffering && m->is_network)
+	if (m->buffering && !m->is_local_file)
 		av_dict_set_int(&opts, "buffer_size", m->buffering, 0);
 
 	m->fmt = avformat_alloc_context();
@@ -674,6 +673,7 @@ bool mp_media_init(mp_media_t *media,
 		mp_stop_cb stop_cb,
 		mp_video_cb v_preload_cb,
 		bool hw_decoding,
+		bool is_local_file,
 		enum video_range_type force_range)
 {
 	memset(media, 0, sizeof(*media));
@@ -685,12 +685,7 @@ bool mp_media_init(mp_media_t *media,
 	media->v_preload_cb = v_preload_cb;
 	media->force_range = force_range;
 	media->buffering = buffering;
-
-	if (path && *path)
-		media->is_network = !!strstr(path, "://");
-
-	if (format && *format)
-		media->is_concat = strcmp(format, "concat") == 0;
+	media->is_local_file = is_local_file;
 
 	static bool initialized = false;
 	if (!initialized) {

deps/media-playback/media-playback/media.h

@@ -62,8 +62,7 @@ struct mp_media {
 
 	struct mp_decode v;
 	struct mp_decode a;
-	bool is_network;
-	bool is_concat;
+	bool is_local_file;
 	bool has_video;
 	bool has_audio;
 	bool is_file;
@@ -107,6 +106,7 @@ extern bool mp_media_init(mp_media_t *media,
 		mp_stop_cb stop_cb,
 		mp_video_cb v_preload_cb,
 		bool hardware_decoding,
+		bool is_local_file,
 		enum video_range_type force_range);
 extern void mp_media_free(mp_media_t *media);
 

plugins/obs-ffmpeg/data/locale/en-US.ini

@@ -36,6 +36,7 @@ ColorRange.Auto="Auto"
 ColorRange.Partial="Partial"
 ColorRange.Full="Full"
 RestartMedia="Restart Media"
+Seekable="Seekable"
 
 MediaFileFilter.AllMediaFiles="All Media Files"
 MediaFileFilter.VideoFiles="Video Files"

plugins/obs-ffmpeg/obs-ffmpeg-source.c

@@ -58,6 +58,7 @@ struct ffmpeg_source {
 	bool is_clear_on_media_end;
 	bool restart_on_activate;
 	bool close_when_inactive;
+	bool seekable;
 };
 
 static bool is_local_file_modified(obs_properties_t *props,
@@ -73,12 +74,14 @@ static bool is_local_file_modified(obs_properties_t *props,
 	obs_property_t *looping = obs_properties_get(props, "looping");
 	obs_property_t *buffering = obs_properties_get(props, "buffering_mb");
 	obs_property_t *close = obs_properties_get(props, "close_when_inactive");
+	obs_property_t *seekable = obs_properties_get(props, "seekable");
 	obs_property_set_visible(input, !enabled);
 	obs_property_set_visible(input_format, !enabled);
 	obs_property_set_visible(buffering, !enabled);
 	obs_property_set_visible(close, enabled);
 	obs_property_set_visible(local_file, enabled);
 	obs_property_set_visible(looping, enabled);
+	obs_property_set_visible(seekable, !enabled);
 
 	return true;
 }
@@ -181,6 +184,8 @@ static obs_properties_t *ffmpeg_source_getproperties(void *data)
 	obs_property_list_add_int(prop, obs_module_text("ColorRange.Full"),
 			VIDEO_RANGE_FULL);
 
+	obs_properties_add_bool(props, "seekable", obs_module_text("Seekable"));
+
 	return props;
 }
 
@@ -244,7 +249,10 @@ static void ffmpeg_source_open(struct ffmpeg_source *s)
 				s->input, s->input_format,
 				s->buffering_mb * 1024 * 1024,
 				s, get_frame, get_audio, media_stopped,
-				preload_frame, s->is_hw_decoding, s->range);
+				preload_frame,
+				s->is_hw_decoding,
+				s->is_local_file || s->seekable,
+				s->range);
 }
 
 static void ffmpeg_source_tick(void *data, float seconds)
@@ -316,6 +324,7 @@ static void ffmpeg_source_update(void *data, obs_data_t *settings)
 			"color_range");
 	s->buffering_mb = (int)obs_data_get_int(settings, "buffering_mb");
 	s->is_local_file = is_local_file;
+	s->seekable = obs_data_get_bool(settings, "seekable");
 
 	if (s->media_valid) {
 		mp_media_free(&s->media);