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mpegvideoparse: use gstvideoparseutils to handle user data

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This commit is contained in:
Aaron Boxer 2019-05-08 11:04:49 -04:00
parent 22ec7fbbc2
commit d5946fc804
2 changed files with 24 additions and 101 deletions
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118
gst/videoparsers/gstmpegvideoparse.c
View file

@ -461,93 +461,20 @@ parse_packet_extension (GstMpegvParse * mpvparse, GstMapInfo * info, guint off)
}
}
/* A53-4 Table 6.7 */
#define A53_USER_DATA_ID_GA94 0x47413934
#define A53_USER_DATA_ID_DTG1 0x44544731
/* A53-4 Table 6.9 */
#define A53_USER_DATA_TYPE_CODE_MPEG_CC_DATA 0x03
#define A53_USER_DATA_TYPE_CODE_BAR_DATA 0x06
/* CEA-708 Table 2 */
#define CEA_708_PROCESS_CC_DATA_FLAG 0x40
#define CEA_708_PROCESS_EM_DATA_FLAG 0x80
static void
parse_user_data_packet (GstMpegvParse * mpvparse, const guint8 * data,
guint size)
{
gboolean a53_user_data_ga94 = FALSE;
gboolean a53_user_data_dtg1 = FALSE;
gboolean a53_user_data_mpeg_cc = FALSE;
gboolean a53_process_708_cc_data = FALSE;
gboolean process_708_em_data = FALSE;
GstByteReader br;
GstVideoParseUtilsField field = GST_VIDEO_PARSE_UTILS_FIELD_1;
gst_byte_reader_init (&br, data, size);
if (size < 2) {
GST_DEBUG_OBJECT (mpvparse, "user data packet too short, ignoring");
return;
}
if (mpvparse->picext.picture_structure ==
(guint8) GST_MPEG_VIDEO_PICTURE_STRUCTURE_BOTTOM_FIELD)
field = GST_VIDEO_PARSE_UTILS_FIELD_2;
gst_video_parse_user_data ((GstElement *) mpvparse, &mpvparse->user_data, &br,
field, ITU_T_T35_MANUFACTURER_US_ATSC);
/* A53 part 4 closed captions */
if (size > 6) {
guint32 user_data_id = GST_READ_UINT32_BE (data);
a53_user_data_ga94 = user_data_id == A53_USER_DATA_ID_GA94;
a53_user_data_dtg1 = user_data_id == A53_USER_DATA_ID_DTG1;
a53_user_data_mpeg_cc = data[4] == A53_USER_DATA_TYPE_CODE_MPEG_CC_DATA;
a53_process_708_cc_data = (data[5] & CEA_708_PROCESS_CC_DATA_FLAG) != 0;
process_708_em_data = (data[5] & CEA_708_PROCESS_EM_DATA_FLAG) != 0;
if (a53_user_data_dtg1) {
GST_DEBUG_OBJECT (mpvparse,
"ignoring closed captions as DTG1 is not supported");
} else if (a53_user_data_ga94) {
GST_DEBUG_OBJECT (mpvparse, "GA94 closed captions");
if (!a53_user_data_mpeg_cc) {
GST_DEBUG_OBJECT (mpvparse,
"ignoring closed captions as A53_USER_DATA_TYPE_CODE_MPEG_CC_DATA is not set");
}
if (!a53_process_708_cc_data) {
GST_DEBUG_OBJECT (mpvparse,
"ignoring closed captions as CEA_708_PROCESS_CC_DATA_FLAG is not set");
}
if (!process_708_em_data) {
GST_DEBUG_OBJECT (mpvparse,
"CEA_708_PROCESS_EM_DATA_FLAG flag is not set");
}
/* ignore em data flag for now as it breaks one of the tests */
process_708_em_data = /*process_708_em_data && */ (data[6] == 0xff);
if (!process_708_em_data) {
GST_DEBUG_OBJECT (mpvparse,
"ignoring closed captions as em data does not equal 0xFF");
}
}
}
if (size > 6 && a53_user_data_ga94 && a53_user_data_mpeg_cc
&& a53_process_708_cc_data && process_708_em_data) {
guint8 cc_count = data[5] & 0x1f;
guint cc_size = cc_count * 3;
data += 7;
size -= 7;
if (cc_size == 0 || cc_size > size) {
GST_DEBUG_OBJECT (mpvparse, "ignoring closed captions, not enough data");
return;
}
/* Shouldn't really happen so let's not go out of our way to handle it */
if (mpvparse->closedcaptions_size > 0)
GST_WARNING_OBJECT (mpvparse, "unused pending closed captions!");
g_assert (cc_size <= sizeof (mpvparse->closedcaptions));
memcpy (mpvparse->closedcaptions, data, cc_size);
mpvparse->closedcaptions_size = cc_size;
mpvparse->closedcaptions_type = GST_VIDEO_CAPTION_TYPE_CEA708_RAW;
GST_DEBUG_OBJECT (mpvparse, "CEA-708 closed captions, %u bytes", cc_size);
return;
}
GST_MEMDUMP_OBJECT (mpvparse, "unhandled user data packet", data, size);
}
/* caller guarantees at least start code in @buf at @off ( - 4)*/
@ -1040,6 +967,7 @@ gst_mpegv_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
GstMpegVideoPictureHdr *pic_hdr = NULL;
GstMpegVideoPictureExt *pic_ext = NULL;
GstMpegVideoQuantMatrixExt *quant_ext = NULL;
GstBuffer *parse_buffer = NULL;
/* tag sending done late enough in hook to ensure pending events
* have already been sent */
@ -1105,23 +1033,21 @@ gst_mpegv_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
meta->slice_offset = mpvparse->slice_offset;
}
if (mpvparse->closedcaptions_size > 0) {
GstBuffer *buf;
if (frame->out_buffer) {
buf = frame->out_buffer = gst_buffer_make_writable (frame->out_buffer);
} else {
buf = frame->buffer = gst_buffer_make_writable (frame->buffer);
}
gst_buffer_add_video_caption_meta (buf,
mpvparse->closedcaptions_type, mpvparse->closedcaptions,
mpvparse->closedcaptions_size);
mpvparse->closedcaptions_type = GST_VIDEO_CAPTION_TYPE_UNKNOWN;
mpvparse->closedcaptions_size = 0;
if (frame->out_buffer) {
parse_buffer = frame->out_buffer =
gst_buffer_make_writable (frame->out_buffer);
} else {
parse_buffer = frame->buffer = gst_buffer_make_writable (frame->buffer);
}
if (pic_ext && !pic_ext->progressive_frame) {
GST_BUFFER_FLAG_SET (parse_buffer, GST_VIDEO_BUFFER_FLAG_INTERLACED);
if (pic_ext->top_field_first)
GST_BUFFER_FLAG_SET (parse_buffer, GST_VIDEO_BUFFER_FLAG_TFF);
}
gst_video_push_user_data ((GstElement *) mpvparse, &mpvparse->user_data,
parse_buffer);
return GST_FLOW_OK;
}

7
gst/videoparsers/gstmpegvideoparse.h
View file

@ -27,7 +27,7 @@
#include <gst/gst.h>
#include <gst/base/gstbaseparse.h>
#include "gstvideoparseutils.h"
#include <gst/codecparsers/gstmpegvideoparser.h>
G_BEGIN_DECLS
@ -87,10 +87,7 @@ struct _GstMpegvParse {
gboolean picext_updated;
gboolean quantmatrext_updated;
/* pending closed captions */
guint8 closedcaptions[96];
guint closedcaptions_size;
GstVideoCaptionType closedcaptions_type;
GstVideoParseUserData user_data;
/* properties */
gboolean drop;