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h264parse: expose compatible profiles to downstream
Some video bitstreams report a too restrictive set of profiles. If a video decoder was to strictly follow the indicated profile, it wouldn't support that stream, whereas it could in theory and in practice. So we should relax the profile restriction for allowing the decoder to get connected with parser. https://bugzilla.gnome.org/show_bug.cgi?id=739992
This commit is contained in:
Sreerenj Balachandran
Sebastian Dröge
parent
788297fec3
commit
3910cbe7ce
1 changed files with 172 additions and 0 deletions
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@ -1197,6 +1197,176 @@ gst_h264_parse_get_par (GstH264Parse * h264parse, gint * num, gint * den)
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}
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}
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static GstCaps *
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get_compatible_profile_caps (GstH264SPS * sps)
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{
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GstCaps *caps = NULL;
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const gchar **profiles = NULL;
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gint i;
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GValue compat_profiles = G_VALUE_INIT;
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g_value_init (&compat_profiles, GST_TYPE_LIST);
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switch (sps->profile_idc) {
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case GST_H264_PROFILE_EXTENDED:
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if (sps->constraint_set0_flag) { /* A.2.1 */
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if (sps->constraint_set1_flag) {
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static const gchar *profile_array[] =
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{ "constrained-baseline", "baseline", "main", "high",
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"high-10", "high-4:2:2", "high-4:4:4", NULL
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};
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profiles = profile_array;
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} else {
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static const gchar *profile_array[] = { "baseline", NULL };
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profiles = profile_array;
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}
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} else if (sps->constraint_set1_flag) { /* A.2.2 */
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static const gchar *profile_array[] =
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{ "main", "high", "high-10", "high-4:2:2", "high-4:4:4", NULL };
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profiles = profile_array;
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}
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break;
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case GST_H264_PROFILE_BASELINE:
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if (sps->constraint_set1_flag) { /* A.2.1 */
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static const gchar *profile_array[] =
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{ "constrained-baseline", "main", "high", "high-10", "high-4:2:2",
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"high-4:4:4", NULL
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};
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profiles = profile_array;
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} else {
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static const gchar *profile_array[] = { "extended", NULL };
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profiles = profile_array;
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}
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break;
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case GST_H264_PROFILE_MAIN:
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{
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static const gchar *profile_array[] =
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{ "high", "high-10", "high-4:2:2", "high-4:4:4", NULL };
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profiles = profile_array;
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}
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break;
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case GST_H264_PROFILE_HIGH:
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if (sps->constraint_set1_flag) {
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static const gchar *profile_array[] =
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{ "main", "high-10", "high-4:2:2", "high-4:4:4", NULL };
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profiles = profile_array;
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} else {
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static const gchar *profile_array[] =
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{ "high-10", "high-4:2:2", "high-4:4:4", NULL };
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profiles = profile_array;
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}
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break;
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case GST_H264_PROFILE_HIGH10:
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if (sps->constraint_set1_flag) {
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static const gchar *profile_array[] =
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{ "main", "high", "high-4:2:2", "high-4:4:4", NULL };
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profiles = profile_array;
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} else {
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if (sps->constraint_set3_flag) { /* A.2.8 */
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static const gchar *profile_array[] =
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{ "high-10", "high-4:2:2", "high-4:4:4", "high-4:2:2-intra",
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"high-4:4:4-intra", NULL
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};
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profiles = profile_array;
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} else {
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static const gchar *profile_array[] =
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{ "high-4:2:2", "high-4:4:4", NULL };
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profiles = profile_array;
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}
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}
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break;
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case GST_H264_PROFILE_HIGH_422:
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if (sps->constraint_set1_flag) {
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static const gchar *profile_array[] =
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{ "main", "high", "high-10", "high-4:4:4", NULL };
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profiles = profile_array;
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} else {
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if (sps->constraint_set3_flag) { /* A.2.9 */
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static const gchar *profile_array[] =
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{ "high-4:2:2", "high-4:4:4", "high-4:4:4-intra", NULL };
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profiles = profile_array;
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} else {
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static const gchar *profile_array[] = { "high-4:4:4", NULL };
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profiles = profile_array;
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}
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}
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break;
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case GST_H264_PROFILE_HIGH_444:
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if (sps->constraint_set1_flag) {
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static const gchar *profile_array[] =
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{ "main", "high", "high-10", "high-4:2:2", NULL };
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profiles = profile_array;
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} else if (sps->constraint_set3_flag) { /* A.2.10 */
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static const gchar *profile_array[] = { "high-4:4:4", NULL };
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profiles = profile_array;
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}
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break;
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case GST_H264_PROFILE_MULTIVIEW_HIGH:
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/* Fix: should add GST_H264_PROFILE_STEREO_HIGH as compatible
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* profile if number of views == 2. */
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break;
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default:
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break;
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}
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if (profiles) {
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GValue value = G_VALUE_INIT;
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caps = gst_caps_new_empty_simple ("video/x-h264");
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for (i = 0; profiles[i]; i++) {
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g_value_init (&value, G_TYPE_STRING);
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g_value_set_string (&value, profiles[i]);
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gst_value_list_append_value (&compat_profiles, &value);
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g_value_unset (&value);
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}
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gst_caps_set_value (caps, "profile", &compat_profiles);
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g_value_unset (&compat_profiles);
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}
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return caps;
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}
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/* if downstream didn't support the exact profile indicated in sps header,
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* check for the compatible profiles also */
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static void
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ensure_caps_profile (GstH264Parse * h264parse, GstCaps * caps, GstH264SPS * sps)
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{
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GstCaps *filter_caps, *peer_caps, *compat_caps;
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filter_caps = gst_caps_new_empty_simple ("video/x-h264");
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peer_caps =
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gst_pad_peer_query_caps (GST_BASE_PARSE_SRC_PAD (h264parse), filter_caps);
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if (peer_caps && !gst_caps_can_intersect (caps, peer_caps)) {
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GstStructure *structure;
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compat_caps = get_compatible_profile_caps (sps);
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if (compat_caps != NULL) {
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GstCaps *res_caps = NULL;
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res_caps = gst_caps_intersect (peer_caps, compat_caps);
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if (res_caps && !gst_caps_is_empty (res_caps)) {
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const gchar *profile_str = NULL;
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res_caps = gst_caps_fixate (res_caps);
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structure = gst_caps_get_structure (res_caps, 0);
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profile_str = gst_structure_get_string (structure, "profile");
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if (profile_str) {
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gst_caps_set_simple (caps, "profile", G_TYPE_STRING, profile_str,
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NULL);
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GST_DEBUG_OBJECT (h264parse,
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"Setting compatible profile %s to the caps", profile_str);
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}
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}
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if (res_caps)
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gst_caps_unref (res_caps);
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gst_caps_unref (compat_caps);
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}
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}
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if (peer_caps)
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gst_caps_unref (peer_caps);
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gst_caps_unref (filter_caps);
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}
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static void
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gst_h264_parse_update_src_caps (GstH264Parse * h264parse, GstCaps * caps)
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{
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@ -1364,6 +1534,8 @@ gst_h264_parse_update_src_caps (GstH264Parse * h264parse, GstCaps * caps)
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gst_codec_utils_h264_caps_set_level_and_profile (caps,
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map.data + 1, map.size - 1);
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gst_buffer_unmap (sps_buf, &map);
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/* relax the profile constraint to find a suitable decoder */
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ensure_caps_profile (h264parse, caps, sps);
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}
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}
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