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avdemux: Remove typefinder implementation
Direct access to AVInputFormat::read_probe() is not possible anymore with ffmpeg 7.0, and the usefulness of this typefinder seems limited anyway. An alternative implementation around av_probe_input_format3() or similar would be possible but it would be going over all possible ffmpeg probes at once. Having a typefinder here means that basically every application will load the gst-libav plugin when typefinding is necessary, which has unnecessary performance impacts. If a typefinder from here was indeed missing from typefindfunctions in gst-plugins-base then it would be better to add it there directly. Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/3378 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6505>
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1 changed files with 1 additions and 99 deletions
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@ -1372,63 +1372,6 @@ beach:
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}
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}
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#define GST_FFMPEG_TYPE_FIND_SIZE 4096
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#define GST_FFMPEG_TYPE_FIND_MIN_SIZE 256
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static void
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gst_ffmpegdemux_type_find (GstTypeFind * tf, gpointer priv)
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{
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const guint8 *data;
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AVInputFormat *in_plugin = (AVInputFormat *) priv;
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gint res = 0;
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guint64 length;
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GstCaps *sinkcaps;
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/* We want GST_FFMPEG_TYPE_FIND_SIZE bytes, but if the file is shorter than
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* that we'll give it a try... */
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length = gst_type_find_get_length (tf);
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if (length == 0 || length > GST_FFMPEG_TYPE_FIND_SIZE)
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length = GST_FFMPEG_TYPE_FIND_SIZE;
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/* The ffmpeg typefinders assume there's a certain minimum amount of data
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* and will happily do invalid memory access if there isn't, so let's just
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* skip the ffmpeg typefinders if the data available is too short
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* (in which case it's unlikely to be a media file anyway) */
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if (length < GST_FFMPEG_TYPE_FIND_MIN_SIZE) {
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GST_LOG ("not typefinding %" G_GUINT64_FORMAT " bytes, too short", length);
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return;
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}
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GST_LOG ("typefinding %" G_GUINT64_FORMAT " bytes", length);
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if (in_plugin->read_probe &&
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(data = gst_type_find_peek (tf, 0, length)) != NULL) {
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AVProbeData probe_data;
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probe_data.filename = "";
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probe_data.buf = (guint8 *) data;
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probe_data.buf_size = length;
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res = in_plugin->read_probe (&probe_data);
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if (res > 0) {
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res = MAX (1, res * GST_TYPE_FIND_MAXIMUM / AVPROBE_SCORE_MAX);
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/* Restrict the probability for MPEG-TS streams, because there is
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* probably a better version in plugins-base, if the user has a recent
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* plugins-base (in fact we shouldn't even get here for ffmpeg mpegts or
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* mpegtsraw typefinders, since we blacklist them) */
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if (g_str_has_prefix (in_plugin->name, "mpegts"))
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res = MIN (res, GST_TYPE_FIND_POSSIBLE);
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sinkcaps = gst_ffmpeg_formatid_to_caps (in_plugin->name);
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GST_LOG ("libav typefinder '%s' suggests %" GST_PTR_FORMAT ", p=%u%%",
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in_plugin->name, sinkcaps, res);
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gst_type_find_suggest (tf, res, sinkcaps);
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gst_caps_unref (sinkcaps);
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}
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}
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}
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/* Task */
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static void
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gst_ffmpegdemux_loop (GstFFMpegDemux * demux)
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@ -2055,7 +1998,6 @@ gst_ffmpegdemux_register (GstPlugin * plugin)
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while ((in_plugin = av_demuxer_iterate (&i))) {
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gchar *type_name, *typefind_name;
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gint rank;
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gboolean register_typefind_func = TRUE;
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GST_LOG ("Attempting to handle libav demuxer plugin %s [%s]",
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in_plugin->name, in_plugin->long_name);
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@ -2102,42 +2044,6 @@ gst_ffmpegdemux_register (GstPlugin * plugin)
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!strcmp (in_plugin->name, "ffmetadata"))
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continue;
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/* Don't use the typefind functions of formats for which we already have
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* better typefind functions */
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if (!strcmp (in_plugin->name, "mov,mp4,m4a,3gp,3g2,mj2") ||
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!strcmp (in_plugin->name, "ass") ||
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!strcmp (in_plugin->name, "avi") ||
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!strcmp (in_plugin->name, "asf") ||
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!strcmp (in_plugin->name, "mpegvideo") ||
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!strcmp (in_plugin->name, "mp3") ||
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!strcmp (in_plugin->name, "matroska") ||
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!strcmp (in_plugin->name, "matroska_webm") ||
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!strcmp (in_plugin->name, "matroska,webm") ||
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!strcmp (in_plugin->name, "mpeg") ||
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!strcmp (in_plugin->name, "wav") ||
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!strcmp (in_plugin->name, "au") ||
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!strcmp (in_plugin->name, "tta") ||
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!strcmp (in_plugin->name, "rm") ||
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!strcmp (in_plugin->name, "amr") ||
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!strcmp (in_plugin->name, "ogg") ||
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!strcmp (in_plugin->name, "aiff") ||
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!strcmp (in_plugin->name, "ape") ||
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!strcmp (in_plugin->name, "dv") ||
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!strcmp (in_plugin->name, "flv") ||
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!strcmp (in_plugin->name, "mpc") ||
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!strcmp (in_plugin->name, "mpc8") ||
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!strcmp (in_plugin->name, "mpegts") ||
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!strcmp (in_plugin->name, "mpegtsraw") ||
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!strcmp (in_plugin->name, "mxf") ||
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!strcmp (in_plugin->name, "nuv") ||
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!strcmp (in_plugin->name, "swf") ||
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!strcmp (in_plugin->name, "voc") ||
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!strcmp (in_plugin->name, "pva") ||
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!strcmp (in_plugin->name, "gif") ||
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!strcmp (in_plugin->name, "vc1test") ||
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!strcmp (in_plugin->name, "ivf"))
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register_typefind_func = FALSE;
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/* Set the rank of demuxers known to work to MARGINAL.
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* Set demuxers for which we already have another implementation to NONE
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* Set All others to NONE*/
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@ -2214,11 +2120,7 @@ gst_ffmpegdemux_register (GstPlugin * plugin)
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else
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extensions = NULL;
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if (!gst_element_register (plugin, type_name, rank, type) ||
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(register_typefind_func == TRUE &&
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!gst_type_find_register (plugin, typefind_name, rank,
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gst_ffmpegdemux_type_find, extensions, NULL,
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(gpointer) in_plugin, NULL))) {
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if (!gst_element_register (plugin, type_name, rank, type)) {
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g_warning ("Registration of type %s failed", type_name);
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g_free (type_name);
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g_free (typefind_name);
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