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typefinding: add typefind functions for SBC audio

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https://bugzilla.gnome.org/show_bug.cgi?id=690582
This commit is contained in:
Tim-Philipp Müller 2013-01-15 17:27:31 +00:00
parent 4554a8fd64
commit fcd8566665
1 changed files with 62 additions and 0 deletions
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62
gst/typefind/gsttypefindfunctions.c
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@ -4341,6 +4341,66 @@ paris_type_find (GstTypeFind * tf, gpointer unused)
}
}
/*** audio/x-sbc ***/
static GstStaticCaps sbc_caps = GST_STATIC_CAPS ("audio/x-sbc");
#define SBC_CAPS (gst_static_caps_get(&sbc_caps))
static gsize
sbc_check_header (const guint8 * data, gsize len, guint * rate,
guint * channels)
{
static const guint16 sbc_rates[4] = { 16000, 32000, 44100, 48000 };
static const guint8 sbc_blocks[4] = { 4, 8, 12, 16 };
guint n_blocks, ch_mode, n_subbands, bitpool;
if (data[0] != 0x9C || len < 4)
return 0;
n_blocks = sbc_blocks[(data[1] >> 4) & 0x03];
ch_mode = (data[1] >> 2) & 0x03;
n_subbands = (data[1] & 0x01) ? 8 : 4;
bitpool = data[2];
if (bitpool < 2)
return 0;
*rate = sbc_rates[(data[1] >> 6) & 0x03];
*channels = (ch_mode == 0) ? 1 : 2;
if (ch_mode == 0)
return 4 + (n_subbands * 1) / 2 + (n_blocks * 1 * bitpool) / 8;
else if (ch_mode == 1)
return 4 + (n_subbands * 2) / 2 + (n_blocks * 2 * bitpool) / 8;
else if (ch_mode == 2)
return 4 + (n_subbands * 2) / 2 + (n_blocks * bitpool) / 8;
else if (ch_mode == 3)
return 4 + (n_subbands * 2) / 2 + (n_subbands + n_blocks * bitpool) / 8;
return 0;
}
static void
sbc_type_find (GstTypeFind * tf, gpointer unused)
{
const guint8 *data;
gsize frame_len;
guint i, rate, channels, offset = 0;
for (i = 0; i < 10; ++i) {
data = gst_type_find_peek (tf, offset, 8);
if (data == NULL)
return;
frame_len = sbc_check_header (data, 8, &rate, &channels);
if (frame_len == 0)
return;
offset += frame_len;
}
gst_type_find_suggest_simple (tf, GST_TYPE_FIND_POSSIBLE, "audio/x-sbc",
"rate", G_TYPE_INT, rate, "channels", G_TYPE_INT, channels,
"parsed", G_TYPE_BOOLEAN, FALSE, NULL);
}
/*** audio/iLBC-sh ***/
/* NOTE: do not replace this function with two TYPE_FIND_REGISTER_START_WITH */
static GstStaticCaps ilbc_caps = GST_STATIC_CAPS ("audio/iLBC-sh");
@ -5042,6 +5102,8 @@ plugin_init (GstPlugin * plugin)
"amr", "#!AMR-WB", 7, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER (plugin, "audio/iLBC-sh", GST_RANK_PRIMARY, ilbc_type_find,
"ilbc", ILBC_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "audio/x-sbc", GST_RANK_MARGINAL, sbc_type_find,
"sbc", SBC_CAPS, NULL, NULL);
TYPE_FIND_REGISTER_START_WITH (plugin, "audio/x-sid", GST_RANK_MARGINAL,
"sid", "PSID", 4, GST_TYPE_FIND_MAXIMUM);
TYPE_FIND_REGISTER_START_WITH (plugin, "image/x-xcf", GST_RANK_SECONDARY,