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pbutils: add AAC profile detection to codec utils
This moves AAC profile detection to pbutils, and uses this in typefindfunctions. This will also be used in qtdemux. https://bugzilla.gnome.org/show_bug.cgi?id=617314 API: gst_codec_utils_aac_get_profile() API: codec_utils_aac_caps_set_level_and_profile()
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c77f88cac6
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0cf81938a1
4 changed files with 97 additions and 26 deletions
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@ -34,6 +34,12 @@
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#include "pbutils.h"
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#define GST_SIMPLE_CAPS_HAS_NAME(caps,name) \
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gst_structure_has_name(gst_caps_get_structure((caps),0),(name))
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#define GST_SIMPLE_CAPS_HAS_FIELD(caps,field) \
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gst_structure_has_field(gst_caps_get_structure((caps),0),(field))
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/**
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* gst_codec_utils_aac_get_sample_rate_from_index:
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* @sr_idx: Sample rate index as from the AudioSpecificConfig (MPEG-4
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@ -58,6 +64,50 @@ gst_codec_utils_aac_get_sample_rate_from_index (guint sr_idx)
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return 0;
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}
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/**
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* gst_codec_utils_aac_get_profile:
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* @audio_config: a pointer to the AudioSpecificConfig as specified in the
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* Elementary Stream Descriptor (esds) in ISO/IEC 14496-1 (see
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* below for a more details).
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* @len: Length of @audio_config in bytes
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*
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* Returns the profile of the given AAC stream as a string. The profile is
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* determined using the AudioObjectType field which is in the first 5 bits of
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* @audio_config.
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*
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* <note>
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* HE-AAC support has not yet been implemented.
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* </note>
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*
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* Returns: The profile as a const string and NULL if the profile could not be
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* determined.
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*/
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const gchar *
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gst_codec_utils_aac_get_profile (const guint8 * audio_config, guint len)
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{
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guint profile;
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if (len < 1)
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return NULL;
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profile = audio_config[0] >> 3;
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switch (profile) {
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case 1:
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return "main";
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case 2:
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return "lc";
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case 3:
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return "ssr";
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case 4:
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return "ltp";
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default:
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break;
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}
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GST_DEBUG ("Invalid profile idx: %u", profile);
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return NULL;
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}
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/**
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* gst_codec_utils_aac_get_level:
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* @audio_config: a pointer to the AudioSpecificConfig as specified in the
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@ -246,33 +296,55 @@ gst_codec_utils_aac_get_level (const guint8 * audio_config, guint len)
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}
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/**
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* gst_codec_utils_aac_caps_set_level:
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* @caps: the #GstCaps to which the level is to be added
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* gst_codec_utils_aac_caps_set_level_and_profile:
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* @caps: the #GstCaps to which level and profile fields are to be added
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* @audio_config: a pointer to the AudioSpecificConfig as specified in the
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* Elementary Stream Descriptor (esds) in ISO/IEC 14496-1 (see
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* below for a more details).
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* @len: Length of @audio_config in bytes
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*
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* Sets the level in @caps if it can be determined from @audio_config. See
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* #gst_codec_utils_aac_get_level() for more details on the parameters.
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* Sets the level and profile on @caps if it can be determined from
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* @audio_config. See #gst_codec_utils_aac_get_level() and
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* gst_codec_utils_aac_get_profile() for more details on the parameters.
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* @caps must be audio/mpeg caps with an "mpegversion" field of either 2 or 4.
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* If mpegversion is 4, the <tt>base-profile</tt> field is also set in @caps.
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*
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* Returns: TRUE if the level could be set, FALSE otherwise.
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* Returns: TRUE if the level and profile could be set, FALSE otherwise.
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*/
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gboolean
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gst_codec_utils_aac_caps_set_level (GstCaps * caps,
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gst_codec_utils_aac_caps_set_level_and_profile (GstCaps * caps,
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const guint8 * audio_config, guint len)
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{
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const gchar *level;
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GstStructure *s;
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const gchar *level, *profile;
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int mpegversion = 0;
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g_return_val_if_fail (GST_IS_CAPS (caps), FALSE);
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g_return_val_if_fail (GST_CAPS_IS_SIMPLE (caps), FALSE);
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g_return_val_if_fail (GST_SIMPLE_CAPS_HAS_NAME (caps, "audio/mpeg"), FALSE);
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g_return_val_if_fail (GST_SIMPLE_CAPS_HAS_FIELD (caps, "mpegversion"), FALSE);
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g_return_val_if_fail (audio_config != NULL, FALSE);
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s = gst_caps_get_structure (caps, 0);
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gst_structure_get_int (s, "mpegversion", &mpegversion);
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g_return_val_if_fail (mpegversion == 2 || mpegversion == 4, FALSE);
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level = gst_codec_utils_aac_get_level (audio_config, len);
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if (!level)
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return FALSE;
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if (level != NULL)
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gst_structure_set (s, "level", G_TYPE_STRING, level, NULL);
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gst_caps_set_simple (caps, "level", G_TYPE_STRING, level, NULL);
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profile = gst_codec_utils_aac_get_profile (audio_config, len);
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return TRUE;
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if (profile != NULL) {
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if (mpegversion == 4) {
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gst_structure_set (s, "base-profile", G_TYPE_STRING, profile,
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"profile", G_TYPE_STRING, profile, NULL);
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} else {
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gst_structure_set (s, "profile", G_TYPE_STRING, profile, NULL);
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}
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}
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return (level != NULL && profile != NULL);
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}
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@ -30,12 +30,13 @@ G_BEGIN_DECLS
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guint gst_codec_utils_aac_get_sample_rate_from_index (guint sr_idx);
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const gchar * gst_codec_utils_aac_get_level (const guint8 * audio_config,
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guint len);
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const gchar * gst_codec_utils_aac_get_profile (const guint8 * audio_config, guint len);
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gboolean gst_codec_utils_aac_caps_set_level (GstCaps * caps,
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const guint8 * audio_config,
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guint len);
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const gchar * gst_codec_utils_aac_get_level (const guint8 * audio_config, guint len);
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gboolean gst_codec_utils_aac_caps_set_level_and_profile (GstCaps * caps,
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const guint8 * audio_config,
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guint len);
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G_END_DECLS
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@ -660,7 +660,6 @@ static void
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aac_type_find (GstTypeFind * tf, gpointer unused)
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{
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/* LUT to convert the AudioObjectType from the ADTS header to a string */
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static const gchar profile_to_string[][5] = { "main", "lc", "ssr", "ltp" };
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DataScanCtx c = { 0, NULL, 0 };
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while (c.offset < AAC_AMOUNT) {
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@ -693,11 +692,11 @@ aac_type_find (GstTypeFind * tf, gpointer unused)
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snc = GST_READ_UINT16_BE (c.data + len);
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if ((snc & 0xfff6) == 0xfff0) {
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GstCaps *caps;
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guint mpegversion, sample_freq_idx, channel_config, profile, rate;
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guint mpegversion, sample_freq_idx, channel_config, profile_idx, rate;
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guint8 audio_config[2];
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mpegversion = (c.data[1] & 0x08) ? 2 : 4;
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profile = c.data[2] >> 6;
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profile_idx = c.data[2] >> 6;
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sample_freq_idx = ((c.data[2] & 0x3c) >> 2);
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channel_config = ((c.data[2] & 0x01) << 2) + (c.data[3] >> 6);
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@ -713,13 +712,13 @@ aac_type_find (GstTypeFind * tf, gpointer unused)
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}
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rate = gst_codec_utils_aac_get_sample_rate_from_index (sample_freq_idx);
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GST_LOG ("ADTS: profile=%u, rate=%u", profile, rate);
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GST_LOG ("ADTS: profile=%u, rate=%u", profile_idx, rate);
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/* The ADTS frame header is slightly different from the
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* AudioSpecificConfig defined for the MPEG-4 container, so we just
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* construct enough of it for getting the level here. */
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/* ADTS counts profiles from 0 instead of 1 to save bits */
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audio_config[0] = (profile + 1) << 3;
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audio_config[0] = (profile_idx + 1) << 3;
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audio_config[0] |= (sample_freq_idx >> 1) & 0x7;
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audio_config[1] = (sample_freq_idx & 0x1) << 7;
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audio_config[1] |= (channel_config & 0xf) << 3;
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caps = gst_caps_new_simple ("audio/mpeg",
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"framed", G_TYPE_BOOLEAN, FALSE,
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"mpegversion", G_TYPE_INT, mpegversion,
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"stream-type", G_TYPE_STRING, "adts",
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"base-profile", G_TYPE_STRING, profile_to_string[profile],
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"profile", G_TYPE_STRING, profile_to_string[profile], NULL);
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"stream-type", G_TYPE_STRING, "adts", NULL);
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gst_codec_utils_aac_caps_set_level (caps, audio_config, 2);
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gst_codec_utils_aac_caps_set_level_and_profile (caps, audio_config, 2);
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/* add rate and number of channels if we can */
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if (channel_config != 0 && channel_config <= 7) {
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@ -1,6 +1,7 @@
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EXPORTS
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gst_codec_utils_aac_caps_set_level
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gst_codec_utils_aac_caps_set_level_and_profile
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gst_codec_utils_aac_get_level
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gst_codec_utils_aac_get_profile
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gst_codec_utils_aac_get_sample_rate_from_index
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gst_discoverer_audio_info_get_bitrate
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gst_discoverer_audio_info_get_channels
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