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gstreamer/gst-libs/gst/pbutils/codec-utils.c
Alex Ashley 5767d65321 codec-utils: support extension audio object type and sample rate 
ISO 14496-3 defines that audioObjectType 5 is a special case that
indicates SBR is present and that an additional field has to be
parsed to find the true audioObjectType.

There are two ways of signaling SBR within an AAC stream - implicit
and explicit (see [1] section 4.2). When explicit signaling is used,
the presence of SBR data is signaled by means of the SBR
audioObjectType in the AudioSpecificConfig data.

Normally the sample rate is specified by an index into a
table of common sample rates. However index 0x0f is a special case
that indicates that the next 24 bits contain the real sample rate.

[1] https://www.telosalliance.com/support/A-closer-look-into-MPEG-4-High-Efficiency-AAC

Fixes #39
2019-01-11 17:41:15 +05:30

1777 lines
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/* 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/base/gstbitreader.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;
}
static gboolean
gst_codec_utils_aac_get_audio_object_type (GstBitReader * br,
guint8 * audio_object_type)
{
guint8 aot;
if (!gst_bit_reader_get_bits_uint8 (br, &aot, 5))
return FALSE;
if (aot == 31) {
if (!gst_bit_reader_get_bits_uint8 (br, &aot, 6))
return FALSE;
aot += 32;
}
*audio_object_type = aot;
return TRUE;
}
static gboolean
gst_codec_utils_aac_get_audio_sample_rate (GstBitReader * br,
guint * sample_rate)
{
guint8 sampling_freq_index;
guint32 sampling_rate;
if (!gst_bit_reader_get_bits_uint8 (br, &sampling_freq_index, 4))
return FALSE;
if (sampling_freq_index == 0xf) {
if (!gst_bit_reader_get_bits_uint32 (br, &sampling_rate, 24))
return FALSE;
} else {
sampling_rate =
gst_codec_utils_aac_get_sample_rate_from_index (sampling_freq_index);
if (!sampling_rate)
return FALSE;
}
*sample_rate = sampling_rate;
return TRUE;
}
static gboolean
gst_codec_utils_aac_get_audio_object_type_full (GstBitReader * br,
guint8 * audio_object_type, guint8 * channel_config, guint * sample_rate)
{
guint8 aot, channels;
guint rate;
if (!gst_codec_utils_aac_get_audio_object_type (br, &aot))
return FALSE;
if (!gst_codec_utils_aac_get_audio_sample_rate (br, &rate))
return FALSE;
if (!gst_bit_reader_get_bits_uint8 (br, &channels, 4))
return FALSE;
/* 5 indicates SBR extension (i.e. HE-AAC) */
/* 29 indicates PS extension */
if (aot == 5 || aot == 29) {
if (!gst_codec_utils_aac_get_audio_sample_rate (br, &rate))
return FALSE;
if (!gst_codec_utils_aac_get_audio_object_type (br, &aot))
return FALSE;
}
*audio_object_type = aot;
*sample_rate = rate;
*channel_config = channels;
return TRUE;
}
/**
* 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 sample_rate = 0;
guint8 audio_object_type = 0, channel_config = 0;
GstBitReader br = GST_BIT_READER_INIT (audio_config, len);
if (len < 2)
return 0;
gst_codec_utils_aac_get_audio_object_type_full (&br, &audio_object_type,
&channel_config, &sample_rate);
return sample_rate;
}
/**
* 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
* normally determined using the AudioObjectType field which is in the first
* 5 bits of @audio_config
*
* 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)
{
const gchar *profile = NULL;
guint sample_rate;
guint8 audio_object_type, channel_config;
GstBitReader br = GST_BIT_READER_INIT (audio_config, len);
if (len < 1)
return NULL;
GST_MEMDUMP ("audio config", audio_config, len);
if (!gst_codec_utils_aac_get_audio_object_type_full (&br, &audio_object_type,
&channel_config, &sample_rate)) {
return NULL;
}
switch (audio_object_type) {
case 1:
profile = "main";
break;
case 2:
profile = "lc";
break;
case 3:
profile = "ssr";
break;
case 4:
profile = "ltp";
break;
default:
GST_DEBUG ("Invalid profile idx: %u", audio_object_type);
break;
}
return profile;
}
/**
* 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 (if this is 0x5, then the
* real AudioObjectType is carried after the rate and channel data)
* * 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
*
* 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)
{
guint8 audio_object_type = 0xFF, channel_config = 0xFF;
guint 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 = -1, rcu = -1, pcu_ref, rcu_ref;
int ret = -1;
GstBitReader br = GST_BIT_READER_INIT (audio_config, len);
g_return_val_if_fail (audio_config != NULL, NULL);
if (len < 2)
return NULL;
GST_MEMDUMP ("audio config", audio_config, len);
if (!gst_codec_utils_aac_get_audio_object_type_full (&br, &audio_object_type,
&channel_config, &rate)) {
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 (audio_object_type) {
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 (audio_object_type == 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", audio_object_type, 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");
gst_byte_writer_reset (&bw);
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;
}
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