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codec-utils: add a gst_codec_utils_aac_get_index_from_sample_rate

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It maps a sample rate to a well known AAC sample rate index.
This commit is contained in:
Vincent Penquerc'h 2013-07-25 20:03:50 +01:00
parent 047abdc944
commit ee088c6b3f
4 changed files with 29 additions and 4 deletions
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1
docs/libs/gst-plugins-base-libs-sections.txt
View file

@ -1994,6 +1994,7 @@ gst_pb_utils_get_codec_description
<INCLUDE>gst/pbutils/codec-utils.h</INCLUDE>
<SUBSECTION>
gst_codec_utils_aac_get_sample_rate_from_index
gst_codec_utils_aac_get_index_from_sample_rate
gst_codec_utils_aac_get_profile
gst_codec_utils_aac_get_level
gst_codec_utils_aac_caps_set_level_and_profile

30
gst-libs/gst/pbutils/codec-utils.c
View file

@ -45,6 +45,10 @@
#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)
{
@ -71,10 +75,6 @@ digit_to_string (guint digit)
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, 7350
};
if (G_LIKELY (sr_idx < G_N_ELEMENTS (aac_sample_rates)))
return aac_sample_rates[sr_idx];
@ -82,6 +82,28 @@ gst_codec_utils_aac_get_sample_rate_from_index (guint 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_profile:
* @audio_config: a pointer to the AudioSpecificConfig as specified in the

1
gst-libs/gst/pbutils/codec-utils.h
View file

@ -29,6 +29,7 @@ G_BEGIN_DECLS
/* AAC */
guint gst_codec_utils_aac_get_sample_rate_from_index (guint sr_idx);
gint gst_codec_utils_aac_get_index_from_sample_rate (guint rate);
const gchar * gst_codec_utils_aac_get_profile (const guint8 * audio_config, guint len);

1
win32/common/libgstpbutils.def
View file

@ -3,6 +3,7 @@ EXPORTS
gst_codec_utils_aac_get_level
gst_codec_utils_aac_get_profile
gst_codec_utils_aac_get_sample_rate_from_index
gst_codec_utils_aac_get_index_from_sample_rate
gst_codec_utils_h264_caps_set_level_and_profile
gst_codec_utils_h264_get_level
gst_codec_utils_h264_get_level_idc