gstreamer/subprojects/gst-plugins-bad/gst/videoparsers/gstvideoparseutils.c

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/* GStreamer
* Copyright (2019) Collabora Ltd.
* Contact: Aaron Boxer <aaron.boxer@collabora.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/base/base.h>
#include <gst/pbutils/pbutils.h>
#include <gst/video/video.h>
#include <gst/video/video-sei.h>
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#include <gst/base/gstbitreader.h>
#include <gstvideoparseutils.h>
GST_DEBUG_CATEGORY_EXTERN (videoparseutils_debug);
#define GST_CAT_DEFAULT videoparseutils_debug
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static gboolean gst_video_parse_utils_parse_bar (const guint8 * data,
gsize size, GstVideoParseUtilsField field, GstVideoBarData * bar);
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static gboolean gst_video_parse_utils_parse_afd (const guint8 data,
GstVideoAFDSpec spec, GstVideoParseUtilsField field, GstVideoAFD * afd);
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static void gst_video_clear_unregistered_message
(GstVideoUnregisteredMessage * msg);
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/*
* gst_video_parse_user_data:
* @elt: #GstElement that is parsing user data
* @user_data: #GstVideoParseUserData struct to hold parsed closed caption, bar and AFD data
* @br: #GstByteReader attached to buffer of user data
* @field: 0 for progressive or field 1 and 1 for field 2
* @provider_code: Currently, only (US) ATSC and DirecTV provider codes are supported
*
* Parse user data and store in @user_data
*/
void
gst_video_parse_user_data (GstElement * elt, GstVideoParseUserData * user_data,
GstByteReader * br, guint8 field, guint16 provider_code)
{
guint32 user_data_id = 0;
guint8 user_data_type_code = 0;
gboolean a53_process_708_cc_data = FALSE;
gboolean process_708_em_data = FALSE;
guint8 temp = 0;
guint8 cc_count;
guint cc_size;
guint bar_size = 0;
const guint8 *data = NULL;
guint8 directv_size = 0;
/* https://en.wikipedia.org/wiki/CEA-708#Picture_User_Data */
switch (provider_code) {
case ITU_T_T35_MANUFACTURER_US_ATSC:
if (!gst_byte_reader_peek_uint32_be (br, &user_data_id)) {
GST_WARNING_OBJECT (elt, "Missing user data id, ignoring");
return;
}
switch (user_data_id) {
case A53_USER_DATA_ID_DTG1:
case A53_USER_DATA_ID_GA94:
/* ANSI/SCTE 128-2010a section 8.1.2 */
if (!gst_byte_reader_get_uint32_be (br, &user_data_id)) {
GST_WARNING_OBJECT (elt, "Missing user data id, ignoring");
return;
}
break;
default:
/* check for SCTE 20 */
if (user_data_id >> 24 == A53_USER_DATA_TYPE_CODE_CC_DATA) {
user_data_id = USER_DATA_ID_SCTE_20_CC;
gst_byte_reader_skip (br, 1);
}
break;
}
break;
case ITU_T_T35_MANUFACTURER_US_DIRECTV:
user_data_id = USER_DATA_ID_DIRECTV_CC;
break;
default:
GST_LOG_OBJECT (elt, "Unsupported provider code %d", provider_code);
return;
}
switch (user_data_id) {
case USER_DATA_ID_SCTE_20_CC:
GST_DEBUG_OBJECT (elt, "Unsupported SCTE 20 closed captions");
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break;
case A53_USER_DATA_ID_DTG1:
if (!gst_byte_reader_get_uint8 (br, &temp)) {
GST_WARNING_OBJECT (elt, "Missing active format flag, ignoring");
break;
}
/* check active format flag for presence of AFD */
if (temp & 0x40) {
if (!gst_byte_reader_get_uint8 (br, &temp)) {
GST_WARNING_OBJECT (elt,
"Missing active format description, ignoring");
break;
}
GST_LOG_OBJECT (elt, "parsed active format description (AFD): %d",
temp);
user_data->afd_spec = GST_VIDEO_AFD_SPEC_ATSC_A53;
user_data->afd = temp;
user_data->active_format_flag = TRUE;
}
user_data->field = field;
break;
case USER_DATA_ID_DIRECTV_CC:
case A53_USER_DATA_ID_GA94:
if (!gst_byte_reader_get_uint8 (br, &user_data_type_code)) {
GST_WARNING_OBJECT (elt, "Missing user data type code, ignoring");
break;
}
if (provider_code == ITU_T_T35_MANUFACTURER_US_DIRECTV) {
if (!gst_byte_reader_get_uint8 (br, &directv_size)) {
GST_WARNING_OBJECT (elt, "Missing DirecTV size, ignoring");
break;
}
}
switch (user_data_type_code) {
case A53_USER_DATA_TYPE_CODE_CC_DATA:
/* 1 (cc count byte) +
* 1 (reserved byte, 0xff) +
* 1 (marker_bits, 0xff)
*/
if (gst_byte_reader_get_remaining (br) < 3) {
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GST_WARNING_OBJECT (elt,
"Closed caption data packet too short, ignoring");
break;
}
if (!gst_byte_reader_get_uint8 (br, &cc_count)) {
GST_WARNING_OBJECT (elt, "Missing closed caption count, ignoring");
break;
}
/* A53 part 4 closed captions */
a53_process_708_cc_data =
(cc_count & CEA_708_PROCESS_CC_DATA_FLAG) != 0;
if (!a53_process_708_cc_data) {
GST_DEBUG_OBJECT (elt,
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"ignoring closed captions as CEA_708_PROCESS_CC_DATA_FLAG is not set");
}
process_708_em_data = (cc_count & CEA_708_PROCESS_EM_DATA_FLAG) != 0;
if (!process_708_em_data) {
GST_DEBUG_OBJECT (elt,
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"CEA_708_PROCESS_EM_DATA_FLAG flag is not set");
}
if (!gst_byte_reader_get_uint8 (br, &temp)) {
GST_WARNING_OBJECT (elt, "Missing em bits, ignoring");
break;
}
if (temp != 0xff) {
GST_DEBUG_OBJECT (elt, "em data does not equal 0xFF");
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}
process_708_em_data = process_708_em_data && (temp == 0xff);
/* ignore process_708_em_data as there is content that doesn't follow spec for this field */
if (a53_process_708_cc_data) {
cc_count = cc_count & 0x1f;
cc_size = cc_count * 3;
if (cc_size == 0 || cc_size > gst_byte_reader_get_remaining (br)) {
GST_DEBUG_OBJECT (elt,
"ignoring closed captions, not enough data");
break;
}
/* Shouldn't really happen so let's not go out of our way to handle it */
if (user_data->closedcaptions_size > 0)
GST_WARNING_OBJECT (elt, "unused pending closed captions!");
g_assert (cc_size <= sizeof (user_data->closedcaptions));
if (!gst_byte_reader_get_data (br, cc_size, &data))
break;
memcpy (user_data->closedcaptions, data, cc_size);
user_data->closedcaptions_size = cc_size;
user_data->closedcaptions_type = GST_VIDEO_CAPTION_TYPE_CEA708_RAW;
user_data->field = field;
GST_DEBUG_OBJECT (elt, "CEA-708 closed captions, %u bytes",
cc_size);
}
break;
case A53_USER_DATA_TYPE_CODE_SCTE_21_EIA_608_CC_DATA:
GST_DEBUG_OBJECT (elt, "Unsupported SCTE 21 closed captions");
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break;
case A53_USER_DATA_TYPE_CODE_BAR_DATA:
bar_size = gst_byte_reader_get_remaining (br);
if (bar_size == 0) {
GST_WARNING_OBJECT (elt, "Bar data packet too short, ignoring");
break;
}
if (bar_size > GST_VIDEO_BAR_MAX_BYTES) {
GST_WARNING_OBJECT (elt,
"Bar data packet of size %d is too long, ignoring", bar_size);
break;
}
if (!gst_byte_reader_get_data (br, bar_size, &data))
break;
memcpy (user_data->bar_data, data, bar_size);
user_data->bar_data_size = bar_size;
user_data->field = field;
GST_DEBUG_OBJECT (elt, "Bar data, %u bytes", bar_size);
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break;
default:
GST_DEBUG_OBJECT (elt,
"Unrecognized user data type code %d of size %d",
user_data_type_code, gst_byte_reader_get_remaining (br));
break;
}
break;
default:
GST_DEBUG_OBJECT (elt,
"Unrecognized user data id %d of size %d", user_data_id,
gst_byte_reader_get_remaining (br));
break;
}
}
/*
* gst_video_push_user_data:
* @elt: #GstElement that is pushing user data
* @user_data: #GstVideoParseUserData holding parsed closed caption, bar and AFD data
* @buf: #GstBuffer that receives the parsed data
*
* After user data has been parsed, add the data to @buf
*/
void
gst_video_push_user_data (GstElement * elt, GstVideoParseUserData * user_data,
GstBuffer * buf)
{
GstVideoAFD afd;
GstVideoBarData bar;
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if (user_data->closedcaptions_size == 0) {
GST_TRACE_OBJECT (elt, "No closed caption data to attach");
} else if (gst_buffer_get_meta (buf, GST_VIDEO_CAPTION_META_API_TYPE)) {
GST_DEBUG_OBJECT (elt, "Buffer already has closed caption meta");
} else {
gst_buffer_add_video_caption_meta (buf,
user_data->closedcaptions_type, user_data->closedcaptions,
user_data->closedcaptions_size);
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}
if (!user_data->active_format_flag) {
GST_TRACE_OBJECT (elt, "No AFD to attach");
} else if (gst_buffer_get_meta (buf, GST_VIDEO_AFD_META_API_TYPE)) {
GST_DEBUG_OBJECT (elt, "Buffer already has AFD meta");
} else if (!gst_video_parse_utils_parse_afd (user_data->afd,
user_data->afd_spec, user_data->field, &afd)) {
GST_WARNING_OBJECT (elt, "Invalid AFD value %d", user_data->afd);
} else {
gst_buffer_add_video_afd_meta (buf, afd.field, afd.spec, afd.afd);
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}
if (!user_data->bar_data_size) {
GST_TRACE_OBJECT (elt, "No Bar data to attach");
} else if (gst_buffer_get_meta (buf, GST_VIDEO_BAR_META_API_TYPE)) {
GST_DEBUG_OBJECT (elt, "Buffer already has Bar meta");
} else if (!gst_video_parse_utils_parse_bar (user_data->bar_data,
user_data->bar_data_size, user_data->field, &bar)) {
GST_WARNING_OBJECT (elt, "Invalid Bar data");
} else {
gst_buffer_add_video_bar_meta (buf, bar.field, bar.is_letterbox,
bar.bar_data[0], bar.bar_data[1]);
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}
}
/*
* gst_video_parse_utils_parse_bar:
* @data: bar data array
* @size: size of bar data array
* @field: #GstVideoParseUtilsField we're parsing for
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* @bar: #GstVideoBarData structure
*
* Parse bar data bytes into #GstVideoBarData structure
*
* See Table in https://www.atsc.org/wp-content/uploads/2015/03/a_53-Part-4-2009.pdf
*
* Returns: TRUE if parsing was successful, otherwise FALSE
*/
static gboolean
gst_video_parse_utils_parse_bar (const guint8 * data, gsize size,
GstVideoParseUtilsField field, GstVideoBarData * bar)
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{
guint8 temp;
int i = 0;
guint8 bar_flags[4];
guint16 bar_vals[4] = { 0, 0, 0, 0 };
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GstBitReader bar_tender;
g_return_val_if_fail (bar != NULL, FALSE);
if (size == 0 || size > GST_VIDEO_BAR_MAX_BYTES)
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return FALSE;
gst_bit_reader_init (&bar_tender, data, size);
/* parse bar flags */
for (i = 0; i < 4; ++i) {
if (!gst_bit_reader_get_bits_uint8 (&bar_tender, bar_flags + i, 1))
return FALSE;
}
/* the next four bits must equal 1111 */
if (!gst_bit_reader_get_bits_uint8 (&bar_tender, &temp, 4) || temp != 0xF)
return FALSE;
/* parse bar values */
for (i = 0; i < 4; ++i) {
if (bar_flags[i]) {
/* the next two bits must equal 11 */
if (!gst_bit_reader_get_bits_uint8 (&bar_tender, &temp, 2) || temp != 0x3)
return FALSE;
if (!gst_bit_reader_get_bits_uint16 (&bar_tender, bar_vals + i, 14))
return FALSE;
}
}
/* bars are signaled in pairs: either top/bottom or left/right, but not both */
if ((bar_flags[0] != bar_flags[1]) || (bar_flags[2] != bar_flags[3]))
return FALSE;
if (bar_flags[0] && bar_flags[2])
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return FALSE;
bar->field = field;
bar->is_letterbox = bar_flags[0];
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if (bar->is_letterbox) {
bar->bar_data[0] = bar_vals[0];
bar->bar_data[1] = bar_vals[1];
} else {
bar->bar_data[0] = bar_vals[2];
bar->bar_data[1] = bar_vals[3];
}
return TRUE;
}
/*
* gst_video_parse_utils_parse_afd:
* @data: bar byte
* @spec: #GstVideoAFDSpec indicating specification that applies to AFD byte
* @field: #GstVideoParseUtilsField
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* @afd: pointer to #GstVideoAFD struct
*
* Parse afd byte into #GstVideoAFD struct
*
* See:
*
* https://www.atsc.org/wp-content/uploads/2015/03/a_53-Part-4-2009.pdf
*
* https://en.wikipedia.org/wiki/Active_Format_Description#Complete_list_of_AFD_codes
*
* and
*
* SMPTE ST2016-1
*
* Returns: TRUE if parsing was successful, otherwise FALSE
*/
static gboolean
gst_video_parse_utils_parse_afd (const guint8 data, GstVideoAFDSpec spec,
GstVideoParseUtilsField field, GstVideoAFD * afd)
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{
GstVideoAFDAspectRatio aspect_ratio = GST_VIDEO_AFD_ASPECT_RATIO_UNDEFINED;
GstVideoAFDValue afd_data;
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g_return_val_if_fail (afd != NULL, FALSE);
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switch (spec) {
case GST_VIDEO_AFD_SPEC_DVB_ETSI:
case GST_VIDEO_AFD_SPEC_ATSC_A53:
if ((data & 0x40) == 0)
return FALSE;
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afd_data = data & 0xF;
break;
case GST_VIDEO_AFD_SPEC_SMPTE_ST2016_1:
if ((data & 0x80) || (data & 0x3))
return FALSE;
afd_data = (data >> 3) & 0xF;
aspect_ratio = (GstVideoAFDAspectRatio) (((data >> 2) & 1) + 1);
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break;
default:
g_return_val_if_reached (FALSE);
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}
switch (afd_data) {
case GST_VIDEO_AFD_UNAVAILABLE:
if (spec == GST_VIDEO_AFD_SPEC_DVB_ETSI) {
/* reserved for DVB/ETSI */
return FALSE;
}
break;
case GST_VIDEO_AFD_16_9_TOP_ALIGNED:
case GST_VIDEO_AFD_14_9_TOP_ALIGNED:
case GST_VIDEO_AFD_GREATER_THAN_16_9:
case GST_VIDEO_AFD_4_3_FULL_16_9_FULL:
case GST_VIDEO_AFD_4_3_FULL_4_3_PILLAR:
case GST_VIDEO_AFD_16_9_LETTER_16_9_FULL:
case GST_VIDEO_AFD_14_9_LETTER_14_9_PILLAR:
case GST_VIDEO_AFD_4_3_FULL_14_9_CENTER:
case GST_VIDEO_AFD_16_9_LETTER_14_9_CENTER:
case GST_VIDEO_AFD_16_9_LETTER_4_3_CENTER:
break;
default:
return FALSE;
}
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afd->field = field;
afd->aspect_ratio = aspect_ratio;
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afd->spec = spec;
afd->afd = afd_data;
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return TRUE;
}
/*
* gst_video_clear_user_data:
* @user_data: #GstVideoParseUserData struct to hold parsed closed caption, bar and AFD data
*
* Clears the user data, resetting it for the next frame
*/
void
gst_video_clear_user_data (GstVideoParseUserData * user_data)
{
user_data->closedcaptions_size = 0;
user_data->bar_data_size = 0;
user_data->active_format_flag = 0;
}
/*
* gst_video_parse_user_data_unregistered:
* @elt: #GstElement that is parsing user data
* @user_data: #GstVideoParseUserDataUnregistered to hold SEI User Data Unregistered
* @br: #GstByteReader attached to buffer of user data
* @uuid: User Data Unregistered UUID
*
* Copy remaining bytes in @br and store in @user_data
*/
void
gst_video_parse_user_data_unregistered (GstElement * elt,
GstVideoParseUserDataUnregistered * user_data,
GstByteReader * br, guint8 uuid[16])
{
GstVideoUnregisteredMessage msg;
memcpy (&msg.uuid, uuid, 16);
msg.size = gst_byte_reader_get_size (br);
if (!gst_byte_reader_dup_data (br, msg.size, &msg.data)) {
g_return_if_reached ();
}
if (user_data->messages == NULL) {
user_data->messages = g_array_sized_new (FALSE, TRUE,
sizeof (GstVideoUnregisteredMessage), 3);
g_array_set_clear_func (user_data->messages,
(GDestroyNotify) gst_video_clear_unregistered_message);
}
g_array_append_val (user_data->messages, msg);
}
/*
* gst_video_push_user_data_unregistered:
* @elt: #GstElement that is pushing user data
* @user_data: #GstVideoParseUserDataUnregistered holding SEI User Data Unregistered
* @buf: (transfer none): #GstBuffer that receives the unregistered data
*
* Attach unregistered messages from @user_data to @buf as
* GstVideoSEIUserDataUnregisteredMeta
*/
void
gst_video_push_user_data_unregistered (GstElement * elt,
GstVideoParseUserDataUnregistered * user_data, GstBuffer * buf)
{
GArray *messages = user_data->messages;
guint i;
if (messages == NULL || messages->len == 0) {
GST_TRACE_OBJECT (elt, "No unregistered user data to attach");
return;
}
if (gst_buffer_get_meta (buf,
GST_VIDEO_SEI_USER_DATA_UNREGISTERED_META_API_TYPE)) {
GST_DEBUG_OBJECT (elt, "Buffer already has unregistered meta");
return;
}
for (i = 0; i < messages->len; i++) {
GstVideoUnregisteredMessage *msg =
&g_array_index (messages, GstVideoUnregisteredMessage, i);
gst_buffer_add_video_sei_user_data_unregistered_meta (buf, msg->uuid,
msg->data, msg->size);
}
}
/*
* gst_video_clear_user_data_unregistered:
* @user_data: #GstVideoParseUserDataUnregistered holding SEI User Data Unregistered
* @free: Whether to deallocate memory resources
*
* Clears the user data unregistered, resetting it for the next frame
*/
void gst_video_clear_user_data_unregistered
(GstVideoParseUserDataUnregistered * user_data, gboolean free)
{
if (free)
g_clear_pointer (&user_data->messages, g_array_unref);
else if (user_data->messages != NULL)
g_array_set_size (user_data->messages, 0);
}
/*
* gst_video_clear_unregistered_message:
* @msg: #GstVideoUnregisteredMessage holding a single SEI User Data Unregistered
*
* Clears the message, freeing the data
*/
static void
gst_video_clear_unregistered_message (GstVideoUnregisteredMessage * msg)
{
memset (&msg->uuid, 0, sizeof msg->uuid);
g_clear_pointer (&msg->data, g_free);
msg->size = 0;
}