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x264enc: inject CEA708 closed captions

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This commit is contained in:
Mathieu Duponchelle 2019-02-28 11:03:31 +01:00
parent 19b744631b
commit c4456d574f
1 changed files with 54 additions and 0 deletions
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54
ext/x264/gstx264enc.c
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@ -2366,6 +2366,58 @@ gst_x264_enc_propose_allocation (GstVideoEncoder * encoder, GstQuery * query)
query);
}
static void
gst_x264_enc_add_cc (GstBuffer * buffer, x264_picture_t * pic_in)
{
GstVideoCaptionMeta *cc_meta;
gpointer iter = NULL;
while ((cc_meta =
(GstVideoCaptionMeta *) gst_buffer_iterate_meta_filtered (buffer,
&iter, GST_VIDEO_CAPTION_META_API_TYPE))) {
guint i = pic_in->extra_sei.num_payloads;
if (cc_meta->caption_type != GST_VIDEO_CAPTION_TYPE_CEA708_RAW)
continue;
pic_in->extra_sei.num_payloads += 1;
if (!pic_in->extra_sei.payloads)
pic_in->extra_sei.payloads = g_new0 (x264_sei_payload_t, 1);
else
pic_in->extra_sei.payloads =
g_renew (x264_sei_payload_t, pic_in->extra_sei.payloads,
pic_in->extra_sei.num_payloads);
pic_in->extra_sei.sei_free = g_free;
pic_in->extra_sei.payloads[i].payload_size = cc_meta->size + 11;
pic_in->extra_sei.payloads[i].payload =
g_malloc0 (pic_in->extra_sei.payloads[i].payload_size);
pic_in->extra_sei.payloads[i].payload_type = 4; /* Registered user data */
memcpy (pic_in->extra_sei.payloads[i].payload + 10, cc_meta->data,
cc_meta->size);
pic_in->extra_sei.payloads[i].payload[0] = 181; /* 8-bits itu_t_t35_country_code */
pic_in->extra_sei.payloads[i].payload[1] = 0; /* 16-bits itu_t_t35_provider_code */
pic_in->extra_sei.payloads[i].payload[2] = 49;
pic_in->extra_sei.payloads[i].payload[3] = 'G'; /* 32-bits ATSC_user_identifier */
pic_in->extra_sei.payloads[i].payload[4] = 'A';
pic_in->extra_sei.payloads[i].payload[5] = '9';
pic_in->extra_sei.payloads[i].payload[6] = '4';
pic_in->extra_sei.payloads[i].payload[7] = 3; /* 8-bits ATSC1_data_user_data_type_code */
/* 8-bits:
* 1 bit process_em_data_flag (0)
* 1 bit process_cc_data_flag (1)
* 1 bit additional_data_flag (0)
* 5-bits cc_count
*/
pic_in->extra_sei.payloads[i].payload[8] =
((cc_meta->size / 3) & 0x1f) | 0x40;
pic_in->extra_sei.payloads[i].payload[9] = 0; /* 8 bits em_data, unused */
pic_in->extra_sei.payloads[i].payload[cc_meta->size + 10] = 255; /* 8 marker bits */
}
}
/* chain function
* this function does the actual processing
*/
@ -2423,6 +2475,8 @@ gst_x264_enc_handle_frame (GstVideoEncoder * video_enc,
}
}
gst_x264_enc_add_cc (frame->input_buffer, &pic_in);
ret = gst_x264_enc_encode_frame (encoder, &pic_in, frame, &i_nal, TRUE);
/* input buffer is released later on */