/* GStreamer base utils library codec-specific utility functions
* Copyright (C) 2010 Arun Raghavan <arun.raghavan@collabora.co.uk>
* 2013 Sreerenj Balachandran <sreerenj.balachandran@intel.com>
* 2010 Collabora Multimedia
* 2010 Nokia Corporation
* 2013 Intel Corporation
* 2015 Sebastian Dröge <sebastian@centricular.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.
*/
/**
* SECTION:gstpbutilscodecutils
* @title: Codec utilities
* @short_description: Miscellaneous codec-specific utility functions
*
* Provides codec-specific ulility functions such as functions to provide the
* codec profile and level in human-readable string form from header data.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "pbutils.h"
#include <gst/base/base.h>
#include <gst/tag/tag.h>
#include <string.h>
#define GST_SIMPLE_CAPS_HAS_NAME(caps,name) \
gst_structure_has_name(gst_caps_get_structure((caps),0),(name))
#define GST_SIMPLE_CAPS_HAS_FIELD(caps,field) \
gst_structure_has_field(gst_caps_get_structure((caps),0),(field))
static const guint aac_sample_rates[] = { 96000, 88200, 64000, 48000, 44100,
32000, 24000, 22050, 16000, 12000, 11025, 8000, 7350
};
static const gchar *
digit_to_string (guint digit)
{
static const char itoa[][2] = {
"0", "1", "2", "3", "4", "5", "6", "7", "8", "9"
};
if (G_LIKELY (digit < 10))
return itoa[digit];
else
return NULL;
}
/**
* gst_codec_utils_aac_get_sample_rate_from_index:
* @sr_idx: Sample rate index as from the AudioSpecificConfig (MPEG-4
* container) or ADTS frame header
*
* Translates the sample rate index found in AAC headers to the actual sample
* rate.
*
* Returns: The sample rate if @sr_idx is valid, 0 otherwise.
*/
guint
gst_codec_utils_aac_get_sample_rate_from_index (guint sr_idx)
{
if (G_LIKELY (sr_idx < G_N_ELEMENTS (aac_sample_rates)))
return aac_sample_rates[sr_idx];
GST_WARNING ("Invalid sample rate index %u", sr_idx);
return 0;
}
/**
* gst_codec_utils_aac_get_index_from_sample_rate:
* @rate: Sample rate
*
* Translates the sample rate to the index corresponding to it in AAC spec.
*
* Returns: The AAC index for this sample rate, -1 if the rate is not a
* valid AAC sample rate.
*/
gint
gst_codec_utils_aac_get_index_from_sample_rate (guint rate)
{
guint n;
for (n = 0; n < G_N_ELEMENTS (aac_sample_rates); n++)
if (aac_sample_rates[n] == rate)
return n;
GST_WARNING ("Invalid sample rate %u", rate);
return -1;
}
/**
* gst_codec_utils_aac_get_sample_rate:
* @audio_config: (array length=len): a pointer to the AudioSpecificConfig
* as specified in the Elementary Stream Descriptor (esds)
* in ISO/IEC 14496-1.
* @len: Length of @audio_config
*
* Translates the sample rate index found in AAC headers to the actual sample
* rate.
*
* Returns: The sample rate if sr_idx is valid, 0 otherwise.
*
* Since 1.10
*/
guint
gst_codec_utils_aac_get_sample_rate (const guint8 * audio_config, guint len)
{
guint rate_index;
if (len < 2)
return 0;
rate_index = ((audio_config[0] & 0x7) << 1) | ((audio_config[1] & 0x80) >> 7);
return gst_codec_utils_aac_get_sample_rate_from_index (rate_index);
}
/**
* gst_codec_utils_aac_get_channels:
* @audio_config: (array length=len): a pointer to the AudioSpecificConfig
* as specified in the Elementary Stream Descriptor (esds)
* in ISO/IEC 14496-1.
* @len: Length of @audio_config in bytes
*
* Returns the channels of the given AAC stream.
*
* Returns: The channels or 0 if the channel could not be determined.
*
* Since 1.10
*/
guint
gst_codec_utils_aac_get_channels (const guint8 * audio_config, guint len)
{
guint channels;
if (len < 2)
return 0;
channels = (audio_config[1] & 0x7f) >> 3;
if (channels > 0 && channels < 7)
return channels;
else if (channels == 7)
return 8;
else
return 0;
}
/**
* gst_codec_utils_aac_get_profile:
* @audio_config: (array length=len): a pointer to the AudioSpecificConfig
* as specified in the Elementary Stream Descriptor (esds)
* in ISO/IEC 14496-1.
* @len: Length of @audio_config in bytes
*
* Returns the profile of the given AAC stream as a string. The profile is
* determined using the AudioObjectType field which is in the first 5 bits of
* @audio_config.
*
* > HE-AAC support has not yet been implemented.
*
* Returns: The profile as a const string and %NULL if the profile could not be
* determined.
*/
const gchar *
gst_codec_utils_aac_get_profile (const guint8 * audio_config, guint len)
{
guint profile;
if (len < 1)
return NULL;
GST_MEMDUMP ("audio config", audio_config, len);
profile = audio_config[0] >> 3;
switch (profile) {
case 1:
return "main";
case 2:
return "lc";
case 3:
return "ssr";
case 4:
return "ltp";
default:
break;
}
GST_DEBUG ("Invalid profile idx: %u", profile);
return NULL;
}
/**
* gst_codec_utils_aac_get_level:
* @audio_config: (array length=len): a pointer to the AudioSpecificConfig
* as specified in the Elementary Stream Descriptor (esds)
* in ISO/IEC 14496-1.
* @len: Length of @audio_config in bytes
*
* Determines the level of a stream as defined in ISO/IEC 14496-3. For AAC LC
* streams, the constraints from the AAC audio profile are applied. For AAC
* Main, LTP, SSR and others, the Main profile is used.
*
* The @audio_config parameter follows the following format, starting from the
* most significant bit of the first byte:
*
* * Bit 0:4 contains the AudioObjectType
* * Bit 5:8 contains the sample frequency index (if this is 0xf, then the
* next 24 bits define the actual sample frequency, and subsequent
* fields are appropriately shifted).
* * Bit 9:12 contains the channel configuration
*
* > HE-AAC support has not yet been implemented.
*
* Returns: The level as a const string and %NULL if the level could not be
* determined.
*/
const gchar *
gst_codec_utils_aac_get_level (const guint8 * audio_config, guint len)
{
int profile, sr_idx, channel_config, rate;
/* Number of single channel elements, channel pair elements, low frequency
* elements, independently switched coupling channel elements, and
* dependently switched coupling channel elements.
*
* Note: The 2 CCE types are ignored for now as they require us to actually
* parse the first frame, and they are rarely found in actual streams.
*/
int num_sce = 0, num_cpe = 0, num_lfe = 0, num_cce_indep = 0, num_cce_dep = 0;
int num_channels;
/* Processor and RAM Complexity Units (calculated and "reference" for single
* channel) */
int pcu, rcu, pcu_ref, rcu_ref;
int ret = -1;
g_return_val_if_fail (audio_config != NULL, NULL);
if (len < 2)
return NULL;
GST_MEMDUMP ("audio config", audio_config, len);
profile = audio_config[0] >> 3;
/* FIXME: add support for sr_idx = 0xf */
sr_idx = ((audio_config[0] & 0x7) << 1) | ((audio_config[1] & 0x80) >> 7);
rate = gst_codec_utils_aac_get_sample_rate_from_index (sr_idx);
channel_config = (audio_config[1] & 0x7f) >> 3;
if (rate == 0)
return NULL;
switch (channel_config) {
case 0:
/* Channel config is defined in the AudioObjectType's SpecificConfig,
* which requires some amount of digging through the headers. I only see
* this done in the MPEG conformance streams - FIXME */
GST_WARNING ("Found a stream with channel configuration in the "
"AudioSpecificConfig. Please file a bug with a link to the media if "
"possible.");
return NULL;
case 1:
/* front center */
num_sce = 1;
break;
case 2:
/* front left and right */
num_cpe = 1;
break;
case 3:
/* front left, right, and center */
num_sce = 1;
num_cpe = 1;
break;
case 4:
/* front left, right, and center; rear surround */
num_sce = 2;
num_cpe = 1;
break;
case 5:
/* front left, right, and center; rear left and right surround */
num_sce = 1;
num_cpe = 2;
break;
case 6:
/* front left, right, center and LFE; rear left and right surround */
num_sce = 1;
num_cpe = 2;
break;
case 7:
case 12:
case 14:
/* front left, right, center and LFE; outside front left and right;
* rear left and right surround */
num_sce = 1;
num_cpe = 3;
num_lfe = 1;
break;
case 11:
num_sce = 2;
num_cpe = 2;
num_lfe = 1;
break;
default:
GST_WARNING ("Unknown channel config in header: %d", channel_config);
return NULL;
}
switch (profile) {
case 0: /* NULL */
GST_WARNING ("profile 0 is not a valid profile");
return NULL;
case 2: /* LC */
pcu_ref = 3;
rcu_ref = 3;
break;
case 3: /* SSR */
pcu_ref = 4;
rcu_ref = 3;
break;
case 4: /* LTP */
pcu_ref = 4;
rcu_ref = 4;
break;
case 1: /* Main */
default:
/* Other than a couple of ER profiles, Main is the worst-case */
pcu_ref = 5;
rcu_ref = 5;
break;
}
/* "fs_ref" is 48000 Hz for AAC Main/LC/SSR/LTP. SBR's fs_ref is defined as
* 24000/48000 (in/out), for SBR streams. Actual support is a FIXME */
pcu = ((float) rate / 48000) * pcu_ref *
((2 * num_cpe) + num_sce + num_lfe + num_cce_indep + (0.3 * num_cce_dep));
rcu = ((float) rcu_ref) * (num_sce + (0.5 * num_lfe) + (0.5 * num_cce_indep) +
(0.4 * num_cce_dep));
if (num_cpe < 2)
rcu += (rcu_ref + (rcu_ref - 1)) * num_cpe;
else
rcu += (rcu_ref + (rcu_ref - 1) * ((2 * num_cpe) - 1));
num_channels = num_sce + (2 * num_cpe) + num_lfe;
if (profile == 2) {
/* AAC LC => return the level as per the 'AAC Profile' */
if (num_channels <= 2 && rate <= 24000 && pcu <= 3 && rcu <= 5)
ret = 1;
else if (num_channels <= 2 && rate <= 48000 && pcu <= 6 && rcu <= 5)
ret = 2;
/* There is no level 3 for the AAC Profile */
else if (num_channels <= 5 && rate <= 48000 && pcu <= 19 && rcu <= 15)
ret = 4;
else if (num_channels <= 5 && rate <= 96000 && pcu <= 38 && rcu <= 15)
ret = 5;
else if (num_channels <= 7 && rate <= 48000 && pcu <= 25 && rcu <= 19)
ret = 6;
else if (num_channels <= 7 && rate <= 96000 && pcu <= 50 && rcu <= 19)
ret = 7;
} else {
/* Return the level as per the 'Main Profile' */
if (pcu < 40 && rcu < 20)
ret = 1;
else if (pcu < 80 && rcu < 64)
ret = 2;
else if (pcu < 160 && rcu < 128)
ret = 3;
else if (pcu < 320 && rcu < 256)
ret = 4;
}
if (ret == -1) {
GST_WARNING ("couldn't determine level: profile=%u, rate=%u, "
"channel_config=%u, pcu=%d,rcu=%d", profile, rate, channel_config, pcu,
rcu);
return NULL;
} else {
return digit_to_string (ret);
}
}
/**
* gst_codec_utils_aac_caps_set_level_and_profile:
* @caps: the #GstCaps to which level and profile fields are to be added
* @audio_config: (array length=len): a pointer to the AudioSpecificConfig
* as specified in the Elementary Stream Descriptor (esds)
* in ISO/IEC 14496-1. (See below for more details)
* @len: Length of @audio_config in bytes
*
* Sets the level and profile on @caps if it can be determined from
* @audio_config. See gst_codec_utils_aac_get_level() and
* gst_codec_utils_aac_get_profile() for more details on the parameters.
* @caps must be audio/mpeg caps with an "mpegversion" field of either 2 or 4.
* If mpegversion is 4, the "base-profile" field is also set in @caps.
*
* Returns: %TRUE if the level and profile could be set, %FALSE otherwise.
*/
gboolean
gst_codec_utils_aac_caps_set_level_and_profile (GstCaps * caps,
const guint8 * audio_config, guint len)
{
GstStructure *s;
const gchar *level, *profile;
int mpegversion = 0;
g_return_val_if_fail (GST_IS_CAPS (caps), FALSE);
g_return_val_if_fail (GST_CAPS_IS_SIMPLE (caps), FALSE);
g_return_val_if_fail (GST_SIMPLE_CAPS_HAS_NAME (caps, "audio/mpeg"), FALSE);
g_return_val_if_fail (GST_SIMPLE_CAPS_HAS_FIELD (caps, "mpegversion"), FALSE);
g_return_val_if_fail (audio_config != NULL, FALSE);
s = gst_caps_get_structure (caps, 0);
gst_structure_get_int (s, "mpegversion", &mpegversion);
g_return_val_if_fail (mpegversion == 2 || mpegversion == 4, FALSE);
level = gst_codec_utils_aac_get_level (audio_config, len);
if (level != NULL)
gst_structure_set (s, "level", G_TYPE_STRING, level, NULL);
profile = gst_codec_utils_aac_get_profile (audio_config, len);
if (profile != NULL) {
if (mpegversion == 4) {
gst_structure_set (s, "base-profile", G_TYPE_STRING, profile,
"profile", G_TYPE_STRING, profile, NULL);
} else {
gst_structure_set (s, "profile", G_TYPE_STRING, profile, NULL);
}
}
GST_LOG ("profile : %s", (profile) ? profile : "---");
GST_LOG ("level : %s", (level) ? level : "---");
return (level != NULL && profile != NULL);
}
/**
* gst_codec_utils_h264_get_profile:
* @sps: (array length=len): Pointer to the sequence parameter set for the stream.
* @len: Length of the data available in @sps.
*
* Converts the profile indication (profile_idc) in the stream's
* sequence parameter set into a string. The SPS is expected to have the
* following format, as defined in the H.264 specification. The SPS is viewed
* as a bitstream here, with bit 0 being the most significant bit of the first
* byte.
*
* * Bit 0:7 - Profile indication
* * Bit 8 - constraint_set0_flag
* * Bit 9 - constraint_set1_flag
* * Bit 10 - constraint_set2_flag
* * Bit 11 - constraint_set3_flag
* * Bit 12 - constraint_set3_flag
* * Bit 13:15 - Reserved
* * Bit 16:24 - Level indication
*
* Returns: The profile as a const string, or %NULL if there is an error.
*/
const gchar *
gst_codec_utils_h264_get_profile (const guint8 * sps, guint len)
{
const gchar *profile = NULL;
gint csf1, csf3, csf5;
g_return_val_if_fail (sps != NULL, NULL);
if (len < 2)
return NULL;
GST_MEMDUMP ("SPS", sps, len);
csf1 = (sps[1] & 0x40) >> 6;
csf3 = (sps[1] & 0x10) >> 4;
csf5 = (sps[1] & 0x04) >> 2;
switch (sps[0]) {
case 66:
if (csf1)
profile = "constrained-baseline";
else
profile = "baseline";
break;
case 77:
profile = "main";
break;
case 88:
profile = "extended";
break;
case 100:
profile = "high";
break;
case 110:
if (csf3)
profile = "high-10-intra";
else
profile = "high-10";
break;
case 122:
if (csf3)
profile = "high-4:2:2-intra";
else
profile = "high-4:2:2";
break;
case 244:
if (csf3)
profile = "high-4:4:4-intra";
else
profile = "high-4:4:4";
break;
case 44:
profile = "cavlc-4:4:4-intra";
break;
case 118:
profile = "multiview-high";
break;
case 128:
profile = "stereo-high";
break;
case 83:
if (csf5)
profile = "scalable-constrained-baseline";
else
profile = "scalable-baseline";
break;
case 86:
if (csf3)
profile = "scalable-high-intra";
else if (csf5)
profile = "scalable-constrained-high";
else
profile = "scalable-high";
break;
default:
return NULL;
}
return profile;
}
/**
* gst_codec_utils_h264_get_level:
* @sps: (array length=len): Pointer to the sequence parameter set for the stream.
* @len: Length of the data available in @sps.
*
* Converts the level indication (level_idc) in the stream's
* sequence parameter set into a string. The SPS is expected to have the
* same format as for gst_codec_utils_h264_get_profile().
*
* Returns: The level as a const string, or %NULL if there is an error.
*/
const gchar *
gst_codec_utils_h264_get_level (const guint8 * sps, guint len)
{
gint csf3;
g_return_val_if_fail (sps != NULL, NULL);
if (len < 3)
return NULL;
GST_MEMDUMP ("SPS", sps, len);
csf3 = (sps[1] & 0x10) >> 4;
if (sps[2] == 0)
return NULL;
else if ((sps[2] == 11 && csf3) || sps[2] == 9)
return "1b";
else if (sps[2] % 10 == 0)
return digit_to_string (sps[2] / 10);
else {
switch (sps[2]) {
case 11:
return "1.1";
case 12:
return "1.2";
case 13:
return "1.3";
case 21:
return "2.1";
case 22:
return "2.2";
case 31:
return "3.1";
case 32:
return "3.2";
case 41:
return "4.1";
case 42:
return "4.2";
case 51:
return "5.1";
case 52:
return "5.2";
default:
return NULL;
}
}
}
/**
* gst_codec_utils_h264_get_level_idc:
* @level: A level string from caps
*
* Transform a level string from the caps into the level_idc
*
* Returns: the level_idc or 0 if the level is unknown
*/
guint8
gst_codec_utils_h264_get_level_idc (const gchar * level)
{
g_return_val_if_fail (level != NULL, 0);
if (!strcmp (level, "1"))
return 10;
else if (!strcmp (level, "1b"))
return 9;
else if (!strcmp (level, "1.1"))
return 11;
else if (!strcmp (level, "1.2"))
return 12;
else if (!strcmp (level, "1.3"))
return 13;
else if (!strcmp (level, "2"))
return 20;
else if (!strcmp (level, "2.1"))
return 21;
else if (!strcmp (level, "2.2"))
return 22;
else if (!strcmp (level, "3"))
return 30;
else if (!strcmp (level, "3.1"))
return 31;
else if (!strcmp (level, "3.2"))
return 32;
else if (!strcmp (level, "4"))
return 40;
else if (!strcmp (level, "4.1"))
return 41;
else if (!strcmp (level, "4.2"))
return 42;
else if (!strcmp (level, "5"))
return 50;
else if (!strcmp (level, "5.1"))
return 51;
else if (!strcmp (level, "5.2"))
return 52;
GST_WARNING ("Invalid level %s", level);
return 0;
}
/**
* gst_codec_utils_h264_caps_set_level_and_profile:
* @caps: the #GstCaps to which the level and profile are to be added
* @sps: (array length=len): Pointer to the sequence parameter set for the stream.
* @len: Length of the data available in @sps.
*
* Sets the level and profile in @caps if it can be determined from @sps. See
* gst_codec_utils_h264_get_level() and gst_codec_utils_h264_get_profile()
* for more details on the parameters.
*
* Returns: %TRUE if the level and profile could be set, %FALSE otherwise.
*/
gboolean
gst_codec_utils_h264_caps_set_level_and_profile (GstCaps * caps,
const guint8 * sps, guint len)
{
const gchar *level, *profile;
g_return_val_if_fail (GST_IS_CAPS (caps), FALSE);
g_return_val_if_fail (GST_CAPS_IS_SIMPLE (caps), FALSE);
g_return_val_if_fail (GST_SIMPLE_CAPS_HAS_NAME (caps, "video/x-h264"), FALSE);
g_return_val_if_fail (sps != NULL, FALSE);
level = gst_codec_utils_h264_get_level (sps, len);
if (level != NULL)
gst_caps_set_simple (caps, "level", G_TYPE_STRING, level, NULL);
profile = gst_codec_utils_h264_get_profile (sps, len);
if (profile != NULL)
gst_caps_set_simple (caps, "profile", G_TYPE_STRING, profile, NULL);
GST_LOG ("profile : %s", (profile) ? profile : "---");
GST_LOG ("level : %s", (level) ? level : "---");
return (level != NULL && profile != NULL);
}
/**
* gst_codec_utils_h265_get_profile:
* @profile_tier_level: (array length=len): Pointer to the profile_tier_level
* structure for the stream.
* @len: Length of the data available in @profile_tier_level
*
* Converts the profile indication (general_profile_idc) in the stream's
* profile_level_tier structure into a string. The profile_tier_level is
* expected to have the following format, as defined in the H.265
* specification. The profile_tier_level is viewed as a bitstream here,
* with bit 0 being the most significant bit of the first byte.
*
* * Bit 0:1 - general_profile_space
* * Bit 2 - general_tier_flag
* * Bit 3:7 - general_profile_idc
* * Bit 8:39 - gernal_profile_compatibility_flags
* * Bit 40 - general_progressive_source_flag
* * Bit 41 - general_interlaced_source_flag
* * Bit 42 - general_non_packed_constraint_flag
* * Bit 43 - general_frame_only_constraint_flag
* * Bit 44:87 - general_reserved_zero_44bits
* * Bit 88:95 - general_level_idc
*
* Returns: The profile as a const string, or %NULL if there is an error.
*
* Since 1.4
*/
const gchar *
gst_codec_utils_h265_get_profile (const guint8 * profile_tier_level, guint len)
{
const gchar *profile = NULL;
gint profile_idc;
g_return_val_if_fail (profile_tier_level != NULL, NULL);
if (len < 2)
return NULL;
GST_MEMDUMP ("ProfileTierLevel", profile_tier_level, len);
profile_idc = (profile_tier_level[0] & 0x1f);
if (profile_idc == 1)
profile = "main";
else if (profile_idc == 2)
profile = "main-10";
else if (profile_idc == 3)
profile = "main-still-picture";
else
profile = NULL;
return profile;
}
/**
* gst_codec_utils_h265_get_tier:
* @profile_tier_level: (array length=len): Pointer to the profile_tier_level
* for the stream.
* @len: Length of the data available in @profile_tier_level.
*
* Converts the tier indication (general_tier_flag) in the stream's
* profile_tier_level structure into a string. The profile_tier_level
* is expected to have the same format as for gst_codec_utils_h264_get_profile().
*
* Returns: The tier as a const string, or %NULL if there is an error.
*
* Since 1.4
*/
const gchar *
gst_codec_utils_h265_get_tier (const guint8 * profile_tier_level, guint len)
{
const gchar *tier = NULL;
gint tier_flag = 0;
g_return_val_if_fail (profile_tier_level != NULL, NULL);
if (len < 1)
return NULL;
GST_MEMDUMP ("ProfileTierLevel", profile_tier_level, len);
tier_flag = (profile_tier_level[0] & 0x20) >> 5;
if (tier_flag)
tier = "high";
else
tier = "main";
return tier;
}
/**
* gst_codec_utils_h265_get_level:
* @profile_tier_level: (array length=len): Pointer to the profile_tier_level
* for the stream
* @len: Length of the data available in @profile_tier_level.
*
* Converts the level indication (general_level_idc) in the stream's
* profile_tier_level structure into a string. The profiel_tier_level is
* expected to have the same format as for gst_codec_utils_h264_get_profile().
*
* Returns: The level as a const string, or %NULL if there is an error.
*
* Since 1.4
*/
const gchar *
gst_codec_utils_h265_get_level (const guint8 * profile_tier_level, guint len)
{
g_return_val_if_fail (profile_tier_level != NULL, NULL);
if (len < 12)
return NULL;
GST_MEMDUMP ("ProfileTierLevel", profile_tier_level, len);
if (profile_tier_level[11] == 0)
return NULL;
else if (profile_tier_level[11] % 30 == 0)
return digit_to_string (profile_tier_level[11] / 30);
else {
switch (profile_tier_level[11]) {
case 63:
return "2.1";
break;
case 93:
return "3.1";
break;
case 123:
return "4.1";
break;
case 153:
return "5.1";
break;
case 156:
return "5.2";
break;
case 183:
return "6.1";
break;
case 186:
return "6.2";
break;
default:
return NULL;
}
}
}
/**
* gst_codec_utils_h265_get_level_idc:
* @level: A level string from caps
*
* Transform a level string from the caps into the level_idc
*
* Returns: the level_idc or 0 if the level is unknown
*
* Since 1.4
*/
guint8
gst_codec_utils_h265_get_level_idc (const gchar * level)
{
g_return_val_if_fail (level != NULL, 0);
if (!strcmp (level, "1"))
return 30;
else if (!strcmp (level, "2"))
return 60;
else if (!strcmp (level, "2.1"))
return 63;
else if (!strcmp (level, "3"))
return 90;
else if (!strcmp (level, "3.1"))
return 93;
else if (!strcmp (level, "4"))
return 120;
else if (!strcmp (level, "4.1"))
return 123;
else if (!strcmp (level, "5"))
return 150;
else if (!strcmp (level, "5.1"))
return 153;
else if (!strcmp (level, "5.2"))
return 156;
else if (!strcmp (level, "6"))
return 180;
else if (!strcmp (level, "6.1"))
return 183;
else if (!strcmp (level, "6.2"))
return 186;
GST_WARNING ("Invalid level %s", level);
return 0;
}
/**
* gst_codec_utils_h265_caps_set_level_tier_and_profile:
* @caps: the #GstCaps to which the level, tier and profile are to be added
* @profile_tier_level: (array length=len): Pointer to the profile_tier_level
* struct
* @len: Length of the data available in @profile_tier_level.
*
* Sets the level, tier and profile in @caps if it can be determined from
* @profile_tier_level. See gst_codec_utils_h265_get_level(),
* gst_codec_utils_h265_get_tier() and gst_codec_utils_h265_get_profile()
* for more details on the parameters.
*
* Returns: %TRUE if the level, tier, profile could be set, %FALSE otherwise.
*
* Since 1.4
*/
gboolean
gst_codec_utils_h265_caps_set_level_tier_and_profile (GstCaps * caps,
const guint8 * profile_tier_level, guint len)
{
const gchar *level, *tier, *profile;
g_return_val_if_fail (GST_IS_CAPS (caps), FALSE);
g_return_val_if_fail (GST_CAPS_IS_SIMPLE (caps), FALSE);
g_return_val_if_fail (GST_SIMPLE_CAPS_HAS_NAME (caps, "video/x-h265"), FALSE);
g_return_val_if_fail (profile_tier_level != NULL, FALSE);
level = gst_codec_utils_h265_get_level (profile_tier_level, len);
if (level != NULL)
gst_caps_set_simple (caps, "level", G_TYPE_STRING, level, NULL);
tier = gst_codec_utils_h265_get_tier (profile_tier_level, len);
if (tier != NULL)
gst_caps_set_simple (caps, "tier", G_TYPE_STRING, tier, NULL);
profile = gst_codec_utils_h265_get_profile (profile_tier_level, len);
if (profile != NULL)
gst_caps_set_simple (caps, "profile", G_TYPE_STRING, profile, NULL);
GST_LOG ("profile : %s", (profile) ? profile : "---");
GST_LOG ("tier : %s", (tier) ? tier : "---");
GST_LOG ("level : %s", (level) ? level : "---");
return (level != NULL && tier != NULL && profile != NULL);
}
/**
* gst_codec_utils_mpeg4video_get_profile:
* @vis_obj_seq: (array length=len): Pointer to the visual object
* sequence for the stream.
* @len: Length of the data available in @sps.
*
* Converts the profile indication in the stream's visual object sequence into
* a string. @vis_obj_seq is expected to be the data following the visual
* object sequence start code. Only the first byte
* (profile_and_level_indication) is used.
*
* Returns: The profile as a const string, or NULL if there is an error.
*/
const gchar *
gst_codec_utils_mpeg4video_get_profile (const guint8 * vis_obj_seq, guint len)
{
/* The profile/level codes are from 14496-2, table G-1, and the Wireshark
* sources: epan/dissectors/packet-mp4ves.c */
/* These are a direct mapping from the integer profile id -> string. Profiles
* 0x6, 0xe and 0xf can correspond to more than one profile depending on the
* second 4 bits of vis_obj_seq[0], so they are handled separately. */
static const char *profiles[] = { "simple", "simple-scalable", "core",
"main", "n-bit", "scalable", NULL, "basic-animated-texture", "hybrid",
"advanced-real-time-simple", "core-scalable", "advanced-coding-efficiency",
"advanced-core", "advanced-scalable-texture",
};
int profile_id, level_id;
g_return_val_if_fail (vis_obj_seq != NULL, NULL);
if (len < 1)
return NULL;
GST_MEMDUMP ("VOS", vis_obj_seq, len);
profile_id = vis_obj_seq[0] >> 4;
level_id = vis_obj_seq[0] & 0xf;
GST_LOG ("profile_id = %d, level_id = %d", profile_id, level_id);
if (profile_id != 6 && profile_id < 0xe)
return profiles[profile_id];
if (profile_id != 0xf && level_id == 0)
return NULL;
switch (profile_id) {
case 0x6:
if (level_id < 3)
return "simple-face";
else if (level_id < 5)
return "simple-fba";
break;
case 0xe:
if (level_id < 5)
return "simple-studio";
else if (level_id < 9)
return "core-studio";
break;
case 0xf:
if (level_id < 6)
return "advanced-simple";
else if (level_id > 7 && level_id < 0xe)
return "fine-granularity-scalable";
break;
}
return NULL;
}
/**
* gst_codec_utils_mpeg4video_get_level:
* @vis_obj_seq: (array length=len): Pointer to the visual object
* sequence for the stream.
* @len: Length of the data available in @sps.
*
* Converts the level indication in the stream's visual object sequence into
* a string. @vis_obj_seq is expected to be the data following the visual
* object sequence start code. Only the first byte
* (profile_and_level_indication) is used.
*
* Returns: The level as a const string, or NULL if there is an error.
*/
const gchar *
gst_codec_utils_mpeg4video_get_level (const guint8 * vis_obj_seq, guint len)
{
/* The profile/level codes are from 14496-2, table G-1, the Wireshark
* sources: epan/dissectors/packet-mp4ves.c and the Xvid Sources:
* src/xvid.h.
* Levels 4a and 5 for SP were added in Amendment 2, level 6 in Amendment 4
* (see Xvid sources vfw/config.c)
*
* Each profile has a different maximum level it defines. Some of them still
* need special case handling, because not all levels start from 1, and the
* Simple profile defines an intermediate level as well. */
static const int level_max[] = { 6, 2, 2, 4, 2, 1, 2, 2, 2, 4, 3, 4, 2, 3, 4,
5
};
int profile_id, level_id;
g_return_val_if_fail (vis_obj_seq != NULL, NULL);
if (len < 1)
return NULL;
GST_MEMDUMP ("VOS", vis_obj_seq, len);
profile_id = vis_obj_seq[0] >> 4;
level_id = vis_obj_seq[0] & 0xf;
GST_LOG ("profile_id = %d, level_id = %d", profile_id, level_id);
if (profile_id != 0xf && level_id == 0)
return NULL;
/* Let's do some validation of the level */
switch (profile_id) {
case 0x3:
if (level_id == 1)
return NULL;
break;
case 0x4:
if (level_id != 2)
return NULL;
break;
case 0x6:
if (level_id > 5)
return NULL;
break;
case 0xe:
if (level_id > 9)
return NULL;
break;
case 0xf:
if (level_id == 6 || level_id == 7 || level_id > 0xd)
return NULL;
break;
}
if (profile_id == 0 && level_id == 8)
/* Simple Profile / Level 0 */
return "0";
else if (profile_id == 0 && level_id == 9)
/* Simple Profile / Level 0b */
return "0b";
else if (profile_id == 0 && level_id == 4)
/* Simple Profile / Level 4a */
return "4a";
else if (profile_id == 0xf && level_id > 7)
/* Fine Granularity Scalable Profile */
return digit_to_string (level_id - 8);
else if (level_id <= level_max[profile_id])
/* Levels for all other cases */
return digit_to_string (level_id);
return NULL;
}
/**
* gst_codec_utils_mpeg4video_caps_set_level_and_profile:
* @caps: the #GstCaps to which the level and profile are to be added
* @vis_obj_seq: (array length=len): Pointer to the visual object
* sequence for the stream.
* @len: Length of the data available in @sps.
*
* Sets the level and profile in @caps if it can be determined from
* @vis_obj_seq. See gst_codec_utils_mpeg4video_get_level() and
* gst_codec_utils_mpeg4video_get_profile() for more details on the
* parameters.
*
* Returns: %TRUE if the level and profile could be set, %FALSE otherwise.
*/
gboolean
gst_codec_utils_mpeg4video_caps_set_level_and_profile (GstCaps * caps,
const guint8 * vis_obj_seq, guint len)
{
const gchar *profile, *level;
g_return_val_if_fail (GST_IS_CAPS (caps), FALSE);
g_return_val_if_fail (GST_CAPS_IS_SIMPLE (caps), FALSE);
g_return_val_if_fail (vis_obj_seq != NULL, FALSE);
profile = gst_codec_utils_mpeg4video_get_profile (vis_obj_seq, len);
if (profile != NULL)
gst_caps_set_simple (caps, "profile", G_TYPE_STRING, profile, NULL);
level = gst_codec_utils_mpeg4video_get_level (vis_obj_seq, len);
if (level != NULL)
gst_caps_set_simple (caps, "level", G_TYPE_STRING, level, NULL);
GST_LOG ("profile : %s", (profile) ? profile : "---");
GST_LOG ("level : %s", (level) ? level : "---");
return (profile != NULL && level != NULL);
}
/**
* gst_codec_utils_opus_parse_caps:
* @caps: the #GstCaps to parse the data from
* @rate: (out): the sample rate
* @channels: (out): the number of channels
* @channel_mapping_family: (out): the channel mapping family
* @stream_count: (out): the number of independent streams
* @coupled_count: (out): the number of stereo streams
* @channel_mapping: (out) (array fixed-size=256): the mapping between the streams
*
* Parses Opus caps and fills the different fields with defaults if possible.
*
* Returns: %TRUE if parsing was successful, %FALSE otherwise.
*
* Since: 1.8
*/
gboolean
gst_codec_utils_opus_parse_caps (GstCaps * caps,
guint32 * rate,
guint8 * channels,
guint8 * channel_mapping_family,
guint8 * stream_count, guint8 * coupled_count, guint8 channel_mapping[256])
{
GstStructure *s;
gint c, f, sc, cc;
const GValue *va, *v;
g_return_val_if_fail (caps != NULL, FALSE);
g_return_val_if_fail (gst_caps_is_fixed (caps), FALSE);
g_return_val_if_fail (!gst_caps_is_empty (caps), FALSE);
s = gst_caps_get_structure (caps, 0);
g_return_val_if_fail (gst_structure_has_name (s, "audio/x-opus"), FALSE);
g_return_val_if_fail (gst_structure_has_field_typed (s,
"channel-mapping-family", G_TYPE_INT), FALSE);
if (rate) {
gint r;
if (gst_structure_get_int (s, "rate", &r))
*rate = r;
else
*rate = 48000;
}
gst_structure_get_int (s, "channel-mapping-family", &f);
if (channel_mapping_family)
*channel_mapping_family = f;
if (!gst_structure_get_int (s, "channels", &c)) {
if (f == 0)
c = 2;
else
return FALSE;
}
if (channels)
*channels = c;
/* RTP mapping */
if (f == 0) {
if (c > 2)
return FALSE;
if (stream_count)
*stream_count = 1;
if (coupled_count)
*coupled_count = c == 2 ? 1 : 0;
if (channel_mapping) {
channel_mapping[0] = 0;
channel_mapping[1] = 1;
}
return TRUE;
}
if (!gst_structure_get_int (s, "stream-count", &sc))
return FALSE;
if (stream_count)
*stream_count = sc;
if (!gst_structure_get_int (s, "coupled-count", &cc))
return FALSE;
if (coupled_count)
*coupled_count = cc;
va = gst_structure_get_value (s, "channel-mapping");
if (!va || !G_VALUE_HOLDS (va, GST_TYPE_ARRAY))
return FALSE;
if (gst_value_array_get_size (va) != c)
return FALSE;
if (channel_mapping) {
gint i;
for (i = 0; i < c; i++) {
gint cm;
v = gst_value_array_get_value (va, i);
if (!G_VALUE_HOLDS (v, G_TYPE_INT))
return FALSE;
cm = g_value_get_int (v);
if (cm < 0 || cm > 255)
return FALSE;
channel_mapping[i] = cm;
}
}
return TRUE;
}
/**
* gst_codec_utils_opus_create_caps:
* @rate: the sample rate
* @channels: the number of channels
* @channel_mapping_family: the channel mapping family
* @stream_count: the number of independent streams
* @coupled_count: the number of stereo streams
* @channel_mapping: (allow-none) (array): the mapping between the streams
*
* Creates Opus caps from the given parameters.
*
* Returns: The #GstCaps, or %NULL if the parameters would lead to
* invalid Opus caps.
*
* Since: 1.8
*/
GstCaps *
gst_codec_utils_opus_create_caps (guint32 rate,
guint8 channels,
guint8 channel_mapping_family,
guint8 stream_count, guint8 coupled_count, const guint8 * channel_mapping)
{
GstCaps *caps = NULL;
GValue va = G_VALUE_INIT;
GValue v = G_VALUE_INIT;
gint i;
if (rate == 0)
rate = 48000;
if (channel_mapping_family == 0) {
if (channels > 2) {
GST_ERROR ("Invalid channels count for channel_mapping_family 0: %d",
channels);
goto done;
}
if (stream_count > 1) {
GST_ERROR ("Invalid stream count for channel_mapping_family 0: %d",
stream_count);
goto done;
}
if (coupled_count > 1) {
GST_ERROR ("Invalid coupled count for channel_mapping_family 0: %d",
coupled_count);
goto done;
}
if (channels == 0)
channels = 2;
if (stream_count == 0)
stream_count = 1;
if (coupled_count == 0)
coupled_count = channels == 2 ? 1 : 0;
return gst_caps_new_simple ("audio/x-opus",
"rate", G_TYPE_INT, rate,
"channels", G_TYPE_INT, channels,
"channel-mapping-family", G_TYPE_INT, channel_mapping_family,
"stream-count", G_TYPE_INT, stream_count,
"coupled-count", G_TYPE_INT, coupled_count, NULL);
}
if (channels == 0) {
GST_ERROR ("Invalid channels count: %d", channels);
goto done;
}
if (stream_count == 0) {
GST_ERROR ("Invalid stream count: %d", stream_count);
goto done;
}
if (coupled_count > stream_count) {
GST_ERROR ("Coupled count %d > stream count: %d", coupled_count,
stream_count);
goto done;
}
if (channel_mapping == NULL) {
GST_ERROR
("A non NULL channel-mapping is needed for channel_mapping_family != 0");
goto done;
}
caps = gst_caps_new_simple ("audio/x-opus",
"rate", G_TYPE_INT, rate,
"channels", G_TYPE_INT, channels,
"channel-mapping-family", G_TYPE_INT, channel_mapping_family,
"stream-count", G_TYPE_INT, stream_count,
"coupled-count", G_TYPE_INT, coupled_count, NULL);
g_value_init (&va, GST_TYPE_ARRAY);
g_value_init (&v, G_TYPE_INT);
for (i = 0; i < channels; i++) {
g_value_set_int (&v, channel_mapping[i]);
gst_value_array_append_value (&va, &v);
}
gst_structure_set_value (gst_caps_get_structure (caps, 0), "channel-mapping",
&va);
g_value_unset (&va);
g_value_unset (&v);
done:
return caps;
}
/*
* (really really) FIXME: move into core (dixit tpm)
*/
/*
* _gst_caps_set_buffer_array:
* @caps: (transfer full): a #GstCaps
* @field: field in caps to set
* @buf: header buffers
*
* Adds given buffers to an array of buffers set as the given @field
* on the given @caps. List of buffer arguments must be NULL-terminated.
*
* Returns: (transfer full): input caps with a streamheader field added, or NULL
* if some error occurred
*/
static GstCaps *
_gst_caps_set_buffer_array (GstCaps * caps, const gchar * field,
GstBuffer * buf, ...)
{
GstStructure *structure = NULL;
va_list va;
GValue array = { 0 };
GValue value = { 0 };
g_return_val_if_fail (caps != NULL, NULL);
g_return_val_if_fail (gst_caps_is_fixed (caps), NULL);
g_return_val_if_fail (field != NULL, NULL);
caps = gst_caps_make_writable (caps);
structure = gst_caps_get_structure (caps, 0);
g_value_init (&array, GST_TYPE_ARRAY);
va_start (va, buf);
/* put buffers in a fixed list */
while (buf) {
g_assert (gst_buffer_is_writable (buf));
/* mark buffer */
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_HEADER);
g_value_init (&value, GST_TYPE_BUFFER);
buf = gst_buffer_copy (buf);
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_HEADER);
gst_value_set_buffer (&value, buf);
gst_buffer_unref (buf);
gst_value_array_append_value (&array, &value);
g_value_unset (&value);
buf = va_arg (va, GstBuffer *);
}
va_end (va);
gst_structure_set_value (structure, field, &array);
g_value_unset (&array);
return caps;
}
/**
* gst_codec_utils_opus_create_caps_from_header:
* @header: OpusHead header
* @comments: (allow-none): Comment header or NULL
*
* Creates Opus caps from the given OpusHead @header and comment header
* @comments.
*
* Returns: The #GstCaps.
*
* Since: 1.8
*/
GstCaps *
gst_codec_utils_opus_create_caps_from_header (GstBuffer * header,
GstBuffer * comments)
{
GstCaps *caps;
guint32 rate;
guint8 channels;
guint8 channel_mapping_family;
guint8 stream_count;
guint8 coupled_count;
guint8 channel_mapping[256];
GstBuffer *dummy_comments = NULL;
g_return_val_if_fail (GST_IS_BUFFER (header), NULL);
g_return_val_if_fail (comments == NULL || GST_IS_BUFFER (comments), NULL);
if (!gst_codec_utils_opus_parse_header (header, &rate, &channels,
&channel_mapping_family, &stream_count, &coupled_count,
channel_mapping, NULL, NULL))
return NULL;
if (!(caps =
gst_codec_utils_opus_create_caps (rate, channels,
channel_mapping_family, stream_count, coupled_count,
channel_mapping)))
return NULL;
if (!comments) {
GstTagList *tags = gst_tag_list_new_empty ();
dummy_comments =
gst_tag_list_to_vorbiscomment_buffer (tags, (const guint8 *) "OpusTags",
8, NULL);
gst_tag_list_unref (tags);
}
_gst_caps_set_buffer_array (caps, "streamheader", header,
comments ? comments : dummy_comments, NULL);
if (dummy_comments)
gst_buffer_unref (dummy_comments);
return caps;
}
/**
* gst_codec_utils_opus_create_header:
* @rate: the sample rate
* @channels: the number of channels
* @channel_mapping_family: the channel mapping family
* @stream_count: the number of independent streams
* @coupled_count: the number of stereo streams
* @channel_mapping: (allow-none) (array): the mapping between the streams
* @pre_skip: Pre-skip in 48kHz samples or 0
* @output_gain: Output gain or 0
*
* Creates OpusHead header from the given parameters.
*
* Returns: The #GstBuffer containing the OpusHead.
*
* Since: 1.8
*/
GstBuffer *
gst_codec_utils_opus_create_header (guint32 rate,
guint8 channels,
guint8 channel_mapping_family,
guint8 stream_count,
guint8 coupled_count,
const guint8 * channel_mapping, guint16 pre_skip, gint16 output_gain)
{
GstBuffer *buffer;
GstByteWriter bw;
gboolean hdl = TRUE;
if (rate == 0)
rate = 48000;
if (channel_mapping_family == 0) {
g_return_val_if_fail (channels <= 2, NULL);
if (channels == 0)
channels = 2;
g_return_val_if_fail (stream_count == 0 || stream_count == 1, NULL);
if (stream_count == 0)
stream_count = 1;
g_return_val_if_fail (coupled_count == 0 || coupled_count == 1, NULL);
if (coupled_count == 0)
coupled_count = channels == 2 ? 1 : 0;
channel_mapping = NULL;
} else {
g_return_val_if_fail (channels > 0, NULL);
g_return_val_if_fail (stream_count > 0, NULL);
g_return_val_if_fail (coupled_count <= stream_count, NULL);
g_return_val_if_fail (channel_mapping != NULL, NULL);
}
gst_byte_writer_init (&bw);
/* See http://wiki.xiph.org/OggOpus */
hdl &= gst_byte_writer_put_data (&bw, (const guint8 *) "OpusHead", 8);
hdl &= gst_byte_writer_put_uint8 (&bw, 0x01); /* version number */
hdl &= gst_byte_writer_put_uint8 (&bw, channels);
hdl &= gst_byte_writer_put_uint16_le (&bw, pre_skip);
hdl &= gst_byte_writer_put_uint32_le (&bw, rate);
hdl &= gst_byte_writer_put_uint16_le (&bw, output_gain);
hdl &= gst_byte_writer_put_uint8 (&bw, channel_mapping_family);
if (channel_mapping_family > 0) {
hdl &= gst_byte_writer_put_uint8 (&bw, stream_count);
hdl &= gst_byte_writer_put_uint8 (&bw, coupled_count);
hdl &= gst_byte_writer_put_data (&bw, channel_mapping, channels);
}
if (!hdl) {
GST_WARNING ("Error creating header");
return NULL;
}
buffer = gst_byte_writer_reset_and_get_buffer (&bw);
GST_BUFFER_OFFSET (buffer) = 0;
GST_BUFFER_OFFSET_END (buffer) = 0;
return buffer;
}
/**
* gst_codec_utils_opus_parse_header:
* @header: the OpusHead #GstBuffer
* @rate: (out): the sample rate
* @channels: (out): the number of channels
* @channel_mapping_family: (out): the channel mapping family
* @stream_count: (out): the number of independent streams
* @coupled_count: (out): the number of stereo streams
* @channel_mapping: (out) (array fixed-size=256): the mapping between the streams
* @pre_skip: (out): Pre-skip in 48kHz samples or 0
* @output_gain: (out): Output gain or 0
*
* Parses the OpusHead header.
*
* Returns: %TRUE if parsing was successful, %FALSE otherwise.
*
* Since: 1.8
*/
gboolean
gst_codec_utils_opus_parse_header (GstBuffer * header,
guint32 * rate,
guint8 * channels,
guint8 * channel_mapping_family,
guint8 * stream_count,
guint8 * coupled_count,
guint8 channel_mapping[256], guint16 * pre_skip, gint16 * output_gain)
{
GstByteReader br;
GstMapInfo map;
gboolean ret = TRUE;
guint8 c, f, version;
g_return_val_if_fail (GST_IS_BUFFER (header), FALSE);
g_return_val_if_fail (gst_buffer_get_size (header) >= 19, FALSE);
if (!gst_buffer_map (header, &map, GST_MAP_READ))
return FALSE;
gst_byte_reader_init (&br, map.data, map.size);
/* See http://wiki.xiph.org/OggOpus */
if (memcmp (gst_byte_reader_get_data_unchecked (&br, 8), "OpusHead", 8) != 0) {
ret = FALSE;
goto done;
}
version = gst_byte_reader_get_uint8_unchecked (&br);
if (version == 0x00)
GST_ERROR ("Opus Header version is wrong, should be 0x01 and not 0x00");
else if (version != 0x01) {
ret = FALSE;
goto done;
}
c = gst_byte_reader_get_uint8_unchecked (&br);
if (channels)
*channels = c;
if (pre_skip)
*pre_skip = gst_byte_reader_get_uint16_le_unchecked (&br);
else
gst_byte_reader_skip_unchecked (&br, 2);
if (rate)
*rate = gst_byte_reader_get_uint32_le_unchecked (&br);
else
gst_byte_reader_skip_unchecked (&br, 4);
if (output_gain)
*output_gain = gst_byte_reader_get_uint16_le_unchecked (&br);
else
gst_byte_reader_skip_unchecked (&br, 2);
f = gst_byte_reader_get_uint8_unchecked (&br);
if (channel_mapping_family)
*channel_mapping_family = f;
if (f == 0 && c <= 2) {
if (stream_count)
*stream_count = 1;
if (coupled_count)
*coupled_count = c == 2 ? 1 : 0;
if (channel_mapping) {
channel_mapping[0] = 0;
channel_mapping[1] = 1;
}
goto done;
}
if (gst_byte_reader_get_remaining (&br) < 2 + c) {
ret = FALSE;
goto done;
}
if (stream_count)
*stream_count = gst_byte_reader_get_uint8_unchecked (&br);
else
gst_byte_reader_skip_unchecked (&br, 1);
if (coupled_count)
*coupled_count = gst_byte_reader_get_uint8_unchecked (&br);
else
gst_byte_reader_skip_unchecked (&br, 1);
if (channel_mapping)
memcpy (channel_mapping, gst_byte_reader_get_data_unchecked (&br, c), c);
done:
gst_buffer_unmap (header, &map);
return ret;
}