headers_pbutils = \
pbutils.h \
+ codec-utils.h \
descriptions.h \
install-plugins.h \
missing-plugins.h \
libgstpbutils_@GST_MAJORMINOR@_la_SOURCES = \
gstpluginsbaseversion.c \
pbutils.c \
+ codec-utils.c \
descriptions.c \
install-plugins.c \
missing-plugins.c \
--- /dev/null
+/* GStreamer base utils library codec-specific utility functions
+ * Copyright (C) 2010 Arun Raghavan <arun.raghavan@collabora.co.uk>
+ * 2010 Collabora Multimedia
+ * 2010 Nokia Corporation
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/**
+ * SECTION:gstpbutilscodecutils
+ * @short_description: Miscellaneous codec-specific utility functions
+ *
+ * <refsect2>
+ * <para>
+ * Provides numerous codec-specific ulility functions such as functions to
+ * provide the codec profile and level in human-readable string form from
+ * header data.
+ * </para>
+ * </refsect2>
+ */
+
+#include "pbutils.h"
+
+/**
+ * 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)
+{
+ static const guint aac_sample_rates[] = { 96000, 88200, 64000, 48000, 44100,
+ 32000, 24000, 22050, 16000, 12000, 11025, 8000
+ };
+
+ 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_level:
+ * @audio_config: a pointer to the AudioSpecificConfig as specified in the
+ * Elementary Stream Descriptor (esds) in ISO/IEC 14496-1 (see
+ * below for a more detailed description).
+ * @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
+ *
+ * <note>
+ * HE-AAC support has not yet been implemented.
+ * </note>
+ *
+ * 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;
+
+ 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:
+ /* 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;
+ 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 {
+ /* 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 {
+ /* For fast and convenient int -> string conversion */
+ static const char itoa[][2] = {
+ "0", "1", "2", "3", "4", "5", "6", "7", "8", "9"
+ };
+
+ g_assert (ret < G_N_ELEMENTS (itoa));
+ return itoa[ret];
+ }
+}
+
+/**
+ * gst_codec_utils_aac_caps_set_level:
+ * @caps: the #GstCaps to which the level is to be added
+ * @audio_config: a pointer to the AudioSpecificConfig as specified in the
+ * Elementary Stream Descriptor (esds) in ISO/IEC 14496-1 (see
+ * below for a more details).
+ * @len: Length of @audio_config in bytes
+ *
+ * Sets the level in @caps if it can be determined from @audio_config. See
+ * #gst_codec_utils_aac_get_level() for more details on the parameters.
+ *
+ * Returns: TRUE if the level could be set, FALSE otherwise.
+ */
+gboolean
+gst_codec_utils_aac_caps_set_level (GstCaps * caps,
+ const guint8 * audio_config, guint len)
+{
+ const gchar *level;
+
+ g_return_val_if_fail (GST_IS_CAPS (caps), FALSE);
+ g_return_val_if_fail (audio_config != NULL, FALSE);
+
+ level = gst_codec_utils_aac_get_level (audio_config, len);
+
+ if (!level)
+ return FALSE;
+
+ gst_caps_set_simple (caps, "level", G_TYPE_STRING, level, NULL);
+
+ return TRUE;
+}
-/* GStreamer
- * Copyright (C) 2010 Nokia Corporation
- * Copyright (C) 2010 Collabora Multimedia
+/* GStreamer base utils library codec-specific utility functions
* Copyright (C) 2010 Arun Raghavan <arun.raghavan@collabora.co.uk>
- *
- * gstaacutil.h: collection of AAC helper utilities
+ * 2010 Collabora Multimedia
+ * 2010 Nokia Corporation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* Boston, MA 02111-1307, USA.
*/
-#ifndef __GST_AAC_UTIL_H__
-#define __GST_AAC_UTIL_H__
-
-#include <glib.h>
+#ifndef __GST_PB_UTILS_CODEC_UTILS_H__
+#define __GST_PB_UTILS_CODEC_UTILS_H__
-/* FIXME: This file is duplicated in gst-plugins-* wherever needed, so if you
- * update this file, please find all other instances and update them as well.
- * This less-than-optimal setup is being used till there is a standard location
- * for such common functionality.
- */
+#include <gst/gst.h>
G_BEGIN_DECLS
-gint gst_aac_level_from_header (guint profile,
- guint sample_freq_idx,
- guint channel_config);
+/* AAC */
+
+guint gst_codec_utils_aac_get_sample_rate_from_index (guint sr_idx);
+
+const gchar * gst_codec_utils_aac_get_level (const guint8 * audio_config,
+ guint len);
+
+gboolean gst_codec_utils_aac_caps_set_level (GstCaps * caps,
+ const guint8 * audio_config,
+ guint len);
G_END_DECLS
-#endif /* __GST_AAC_UTIL_H__*/
+#endif /* __GST_PB_UTILS_CODEC_UTILS_H__ */
#include <gst/pbutils/descriptions.h>
#include <gst/pbutils/missing-plugins.h>
#include <gst/pbutils/install-plugins.h>
+#include <gst/pbutils/codec-utils.h>
#include <gst/pbutils/pbutils-enumtypes.h>
#include <gst/pbutils/pbutils-marshal.h>
#include <gst/pbutils/gstdiscoverer.h>
plugin_LTLIBRARIES = libgsttypefindfunctions.la
-libgsttypefindfunctions_la_SOURCES = gsttypefindfunctions.c gstaacutil.c
-libgsttypefindfunctions_la_CFLAGS = $(GST_CFLAGS) $(GIO_CFLAGS)
+libgsttypefindfunctions_la_SOURCES = gsttypefindfunctions.c
+libgsttypefindfunctions_la_CFLAGS = \
+ $(GST_PLUGINS_BASE_CFLAGS) \
+ $(GST_CFLAGS) $(GIO_CFLAGS)
libgsttypefindfunctions_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
-libgsttypefindfunctions_la_LIBADD = $(GST_LIBS) $(GIO_LIBS)
-libgsttypefindfunctions_la_LIBTOOLFLAGS = --tag=disable-static
+libgsttypefindfunctions_la_LIBADD = \
+ $(top_builddir)/gst-libs/gst/pbutils/libgstpbutils-@GST_MAJORMINOR@.la \
+ $(GST_LIBS) $(GIO_LIBS)
-noinst_HEADERS = gstaacutil.h
+libgsttypefindfunctions_la_LIBTOOLFLAGS = --tag=disable-static
+++ /dev/null
-/* GStreamer
- * Copyright (C) 2010 Nokia Corporation
- * Copyright (C) 2010 Collabora Multimedia
- * Copyright (C) 2010 Arun Raghavan <arun.raghavan@collabora.co.uk>
- *
- * gstaacutil.c: collection of AAC helper utilities
- *
- * 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., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
- */
-
-#include <gst/gst.h>
-
-#include "gstaacutil.h"
-
-/* FIXME: This file is duplicated in gst-plugins-* wherever needed, so if you
- * update this file, please find all other instances and update them as well.
- * This less-than-optimal setup is being used till there is a standard location
- * for such common functionality.
- */
-
-/* Determines the level of a stream as defined in ISO/IEC 14496-3. The
- * sample_frequency_index and channel_configuration must be got from the ESDS
- * for MP4 files and the ADTS header for ADTS streams.
- *
- * For AAC LC streams, we assume that apply the constraints from the AAC audio
- * profile. For AAC Main/LTP/SSR/..., we use the Main profile.
- *
- * FIXME: HE-AAC support is TBD.
- *
- * Returns -1 if the level could not be determined.
- */
-gint
-gst_aac_level_from_header (guint profile, guint rate, guint channel_config)
-{
- /* 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;
-
- 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 -1;
- 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:
- /* 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;
- default:
- GST_WARNING ("Unknown channel config in header: %d", channel_config);
- return -1;
- }
-
- switch (profile) {
- case 0: /* NULL */
- GST_WARNING ("profile 0 is not a valid profile");
- return -1;
- 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)
- return 1;
- if (num_channels <= 2 && rate <= 48000 && pcu <= 6 && rcu <= 5)
- return 2;
- /* There is no level 3 for the AAC Profile */
- if (num_channels <= 5 && rate <= 48000 && pcu <= 19 && rcu <= 15)
- return 4;
- if (num_channels <= 5 && rate <= 96000 && pcu <= 38 && rcu <= 15)
- return 5;
- } else {
- /* Return the level as per the 'Main Profile' */
- if (pcu < 40 && rcu < 20)
- return 1;
- if (pcu < 80 && rcu < 64)
- return 2;
- if (pcu < 160 && rcu < 128)
- return 3;
- if (pcu < 320 && rcu < 256)
- return 4;
- }
-
- GST_WARNING ("couldn't determine level: profile=%u,rate=%u,channel_config=%u,"
- "pcu=%d,rcu=%d", profile, rate, channel_config, pcu, rcu);
- return -1;
-}
#include <string.h>
#include <ctype.h>
-#include "gstaacutil.h"
+#include <gst/pbutils/pbutils.h>
GST_DEBUG_CATEGORY_STATIC (type_find_debug);
#define GST_CAT_DEFAULT type_find_debug
{
/* LUT to convert the AudioObjectType from the ADTS header to a string */
static const gchar profile_to_string[][5] = { "main", "lc", "ssr", "ltp" };
- static const guint sample_freq[] = { 96000, 88200, 64000, 48000, 44100,
- 32000, 24000, 22050, 16000, 12000, 11025, 8000, 7350
- };
DataScanCtx c = { 0, NULL, 0 };
while (c.offset < AAC_AMOUNT) {
if ((snc & 0xfff6) == 0xfff0) {
GstCaps *caps;
guint mpegversion, sample_freq_idx, channel_config, profile, rate;
- gint level;
+ guint8 audio_config[2];
mpegversion = (c.data[1] & 0x08) ? 2 : 4;
profile = c.data[2] >> 6;
goto next;
}
- rate = sample_freq[sample_freq_idx];
+ rate = gst_codec_utils_aac_get_sample_rate_from_index (sample_freq_idx);
GST_LOG ("ADTS: profile=%u, rate=%u", profile, rate);
+ /* The ADTS frame header is slightly different from the
+ * AudioSpecificConfig defined for the MPEG-4 container, so we just
+ * construct enough of it for getting the level here. */
/* ADTS counts profiles from 0 instead of 1 to save bits */
- level = gst_aac_level_from_header (profile + 1, rate, channel_config);
+ audio_config[0] = (profile + 1) << 3;
+ audio_config[0] |= (sample_freq_idx >> 1) & 0x7;
+ audio_config[1] = (sample_freq_idx & 0x1) << 7;
+ audio_config[1] |= (channel_config & 0xf) << 3;
caps = gst_caps_new_simple ("audio/mpeg",
"framed", G_TYPE_BOOLEAN, FALSE,
"base-profile", G_TYPE_STRING, profile_to_string[profile],
"profile", G_TYPE_STRING, profile_to_string[profile], NULL);
- if (level != -1) {
- gchar level_str[16];
-
- /* we use a string here because h.264 levels are also strings and
- * there aren't a lot of levels, so it's not too awkward to not use
- * and integer here and keep the field type consistent with h.264 */
- g_snprintf (level_str, sizeof (level_str), "%d", level);
- gst_caps_set_simple (caps, "level", G_TYPE_STRING, level_str, NULL);
- }
+ gst_codec_utils_aac_caps_set_level (caps, audio_config, 2);
/* add rate and number of channels if we can */
if (channel_config != 0 && channel_config <= 7) {
EXPORTS
+ gst_codec_utils_aac_caps_set_level
+ gst_codec_utils_aac_get_level
+ gst_codec_utils_aac_get_sample_rate_from_index
gst_discoverer_audio_info_get_bitrate
gst_discoverer_audio_info_get_channels
gst_discoverer_audio_info_get_depth
projects / platform / upstream / gst-plugins-base.git / commitdiff