From 3910cbe7ce1a67ed5506f87e4c5a005c168d0e6c Mon Sep 17 00:00:00 2001 From: Sreerenj Balachandran Date: Tue, 2 Dec 2014 10:10:39 +0200 Subject: [PATCH] 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 --- gst/videoparsers/gsth264parse.c | 172 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 172 insertions(+) diff --git a/gst/videoparsers/gsth264parse.c b/gst/videoparsers/gsth264parse.c index db8e909..5517866 100644 --- a/gst/videoparsers/gsth264parse.c +++ b/gst/videoparsers/gsth264parse.c @@ -1197,6 +1197,176 @@ gst_h264_parse_get_par (GstH264Parse * h264parse, gint * num, gint * den) } } +static GstCaps * +get_compatible_profile_caps (GstH264SPS * sps) +{ + GstCaps *caps = NULL; + const gchar **profiles = NULL; + gint i; + GValue compat_profiles = G_VALUE_INIT; + g_value_init (&compat_profiles, GST_TYPE_LIST); + + switch (sps->profile_idc) { + case GST_H264_PROFILE_EXTENDED: + if (sps->constraint_set0_flag) { /* A.2.1 */ + if (sps->constraint_set1_flag) { + static const gchar *profile_array[] = + { "constrained-baseline", "baseline", "main", "high", + "high-10", "high-4:2:2", "high-4:4:4", NULL + }; + profiles = profile_array; + } else { + static const gchar *profile_array[] = { "baseline", NULL }; + profiles = profile_array; + } + } else if (sps->constraint_set1_flag) { /* A.2.2 */ + static const gchar *profile_array[] = + { "main", "high", "high-10", "high-4:2:2", "high-4:4:4", NULL }; + profiles = profile_array; + } + break; + case GST_H264_PROFILE_BASELINE: + if (sps->constraint_set1_flag) { /* A.2.1 */ + static const gchar *profile_array[] = + { "constrained-baseline", "main", "high", "high-10", "high-4:2:2", + "high-4:4:4", NULL + }; + profiles = profile_array; + } else { + static const gchar *profile_array[] = { "extended", NULL }; + profiles = profile_array; + } + break; + case GST_H264_PROFILE_MAIN: + { + static const gchar *profile_array[] = + { "high", "high-10", "high-4:2:2", "high-4:4:4", NULL }; + profiles = profile_array; + } + break; + case GST_H264_PROFILE_HIGH: + if (sps->constraint_set1_flag) { + static const gchar *profile_array[] = + { "main", "high-10", "high-4:2:2", "high-4:4:4", NULL }; + profiles = profile_array; + } else { + static const gchar *profile_array[] = + { "high-10", "high-4:2:2", "high-4:4:4", NULL }; + profiles = profile_array; + } + break; + case GST_H264_PROFILE_HIGH10: + if (sps->constraint_set1_flag) { + static const gchar *profile_array[] = + { "main", "high", "high-4:2:2", "high-4:4:4", NULL }; + profiles = profile_array; + } else { + if (sps->constraint_set3_flag) { /* A.2.8 */ + static const gchar *profile_array[] = + { "high-10", "high-4:2:2", "high-4:4:4", "high-4:2:2-intra", + "high-4:4:4-intra", NULL + }; + profiles = profile_array; + } else { + static const gchar *profile_array[] = + { "high-4:2:2", "high-4:4:4", NULL }; + profiles = profile_array; + } + } + break; + case GST_H264_PROFILE_HIGH_422: + if (sps->constraint_set1_flag) { + static const gchar *profile_array[] = + { "main", "high", "high-10", "high-4:4:4", NULL }; + profiles = profile_array; + } else { + if (sps->constraint_set3_flag) { /* A.2.9 */ + static const gchar *profile_array[] = + { "high-4:2:2", "high-4:4:4", "high-4:4:4-intra", NULL }; + profiles = profile_array; + } else { + static const gchar *profile_array[] = { "high-4:4:4", NULL }; + profiles = profile_array; + } + } + break; + case GST_H264_PROFILE_HIGH_444: + if (sps->constraint_set1_flag) { + static const gchar *profile_array[] = + { "main", "high", "high-10", "high-4:2:2", NULL }; + profiles = profile_array; + } else if (sps->constraint_set3_flag) { /* A.2.10 */ + static const gchar *profile_array[] = { "high-4:4:4", NULL }; + profiles = profile_array; + } + break; + case GST_H264_PROFILE_MULTIVIEW_HIGH: + /* Fix: should add GST_H264_PROFILE_STEREO_HIGH as compatible + * profile if number of views == 2. */ + break; + default: + break; + } + + if (profiles) { + GValue value = G_VALUE_INIT; + caps = gst_caps_new_empty_simple ("video/x-h264"); + for (i = 0; profiles[i]; i++) { + g_value_init (&value, G_TYPE_STRING); + g_value_set_string (&value, profiles[i]); + gst_value_list_append_value (&compat_profiles, &value); + g_value_unset (&value); + } + gst_caps_set_value (caps, "profile", &compat_profiles); + g_value_unset (&compat_profiles); + } + + return caps; +} + +/* if downstream didn't support the exact profile indicated in sps header, + * check for the compatible profiles also */ +static void +ensure_caps_profile (GstH264Parse * h264parse, GstCaps * caps, GstH264SPS * sps) +{ + GstCaps *filter_caps, *peer_caps, *compat_caps; + + filter_caps = gst_caps_new_empty_simple ("video/x-h264"); + peer_caps = + gst_pad_peer_query_caps (GST_BASE_PARSE_SRC_PAD (h264parse), filter_caps); + + if (peer_caps && !gst_caps_can_intersect (caps, peer_caps)) { + GstStructure *structure; + + compat_caps = get_compatible_profile_caps (sps); + if (compat_caps != NULL) { + GstCaps *res_caps = NULL; + + res_caps = gst_caps_intersect (peer_caps, compat_caps); + + if (res_caps && !gst_caps_is_empty (res_caps)) { + const gchar *profile_str = NULL; + + res_caps = gst_caps_fixate (res_caps); + structure = gst_caps_get_structure (res_caps, 0); + profile_str = gst_structure_get_string (structure, "profile"); + if (profile_str) { + gst_caps_set_simple (caps, "profile", G_TYPE_STRING, profile_str, + NULL); + GST_DEBUG_OBJECT (h264parse, + "Setting compatible profile %s to the caps", profile_str); + } + } + if (res_caps) + gst_caps_unref (res_caps); + gst_caps_unref (compat_caps); + } + } + if (peer_caps) + gst_caps_unref (peer_caps); + gst_caps_unref (filter_caps); +} + static void gst_h264_parse_update_src_caps (GstH264Parse * h264parse, GstCaps * caps) { @@ -1364,6 +1534,8 @@ gst_h264_parse_update_src_caps (GstH264Parse * h264parse, GstCaps * caps) gst_codec_utils_h264_caps_set_level_and_profile (caps, map.data + 1, map.size - 1); gst_buffer_unmap (sps_buf, &map); + /* relax the profile constraint to find a suitable decoder */ + ensure_caps_profile (h264parse, caps, sps); } } -- 2.7.4