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x264enc: Don't assume the order of nal unit

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Just for extra safety, let's check the index of the nal unit
through the enum value of the nal type provided by x264.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3014>
This commit is contained in:
Yeongjin Jeong 2018-10-17 23:38:22 +09:00 committed by Tim-Philipp Müller
parent a9ae28d10b
commit 8ebd854454
1 changed files with 29 additions and 15 deletions
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42
subprojects/gst-plugins-ugly/ext/x264/gstx264enc.c
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@ -1930,7 +1930,7 @@ gst_x264_enc_set_profile_and_level (GstX264Enc * encoder, GstCaps * caps)
x264_nal_t *nal;
int i_nal;
int header_return;
gint sps_ni = 0;
gint i;
guint8 *sps;
GstStructure *s;
const gchar *profile;
@ -1946,13 +1946,20 @@ gst_x264_enc_set_profile_and_level (GstX264Enc * encoder, GstCaps * caps)
return FALSE;
}
/* old x264 returns SEI, SPS and PPS, newer one has SEI last */
if (i_nal == 3 && nal[sps_ni].i_type != 7)
sps_ni = 1;
sps = nal[sps_ni].p_payload + 4;
sps = NULL;
for (i = 0; i < i_nal; i++) {
if (nal[i].i_type == NAL_SPS) {
sps = nal[i].p_payload + 4;
/* skip NAL unit type */
sps++;
}
}
if (!sps) {
GST_ELEMENT_ERROR (encoder, STREAM, ENCODE, ("Encode x264 header failed."),
("x264_encoder_headers did not return SPS"));
return FALSE;
}
gst_codec_utils_h264_caps_set_level_and_profile (caps, sps, 3);
@ -2016,9 +2023,10 @@ gst_x264_enc_header_buf (GstX264Enc * encoder)
int header_return;
int i_size;
int nal_size;
gint i;
guint8 *buffer, *sps;
gulong buffer_size;
gint sei_ni = 2, sps_ni = 0, pps_ni = 1;
gint sei_ni, sps_ni, pps_ni;
if (G_UNLIKELY (encoder->x264enc == NULL))
return NULL;
@ -2033,25 +2041,31 @@ gst_x264_enc_header_buf (GstX264Enc * encoder)
return NULL;
}
/* old x264 returns SEI, SPS and PPS, newer one has SEI last */
if (i_nal == 3 && nal[sps_ni].i_type != 7) {
sei_ni = 0;
sps_ni = 1;
pps_ni = 2;
sei_ni = sps_ni = pps_ni = -1;
for (i = 0; i < i_nal; i++) {
if (nal[i].i_type == NAL_SEI) {
sei_ni = i;
} else if (nal[i].i_type == NAL_SPS) {
sps_ni = i;
} else if (nal[i].i_type == NAL_PPS) {
pps_ni = i;
}
}
/* x264 is expected to return an SEI (some identification info),
* and SPS and PPS */
if (i_nal != 3 || nal[sps_ni].i_type != 7 || nal[pps_ni].i_type != 8 ||
if (sps_ni == -1 || pps_ni == -1 ||
nal[sps_ni].i_payload < 4 || nal[pps_ni].i_payload < 1) {
GST_ELEMENT_ERROR (encoder, STREAM, ENCODE, (NULL),
("Unexpected x264 header."));
return NULL;
}
GST_MEMDUMP ("SEI", nal[sei_ni].p_payload, nal[sei_ni].i_payload);
GST_MEMDUMP ("SPS", nal[sps_ni].p_payload, nal[sps_ni].i_payload);
GST_MEMDUMP ("PPS", nal[pps_ni].p_payload, nal[pps_ni].i_payload);
if (sei_ni != -1) {
GST_MEMDUMP ("SEI", nal[sei_ni].p_payload, nal[sei_ni].i_payload);
}
/* nal payloads with emulation_prevention_three_byte, and some header data */
buffer_size = (nal[sps_ni].i_payload + nal[pps_ni].i_payload) * 4 + 100;