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ogg: extract number of channels from FLAC, speex and vorbis headers

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Because we can.
This commit is contained in:
Tim-Philipp Müller 2009-12-03 23:43:08 +00:00
parent e6e9e3c589
commit 295b6c0326
1 changed files with 20 additions and 8 deletions
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28
ext/ogg/gstoggstream.c
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@ -441,8 +441,11 @@ static gboolean
setup_vorbis_mapper (GstOggStream * pad, ogg_packet * packet) setup_vorbis_mapper (GstOggStream * pad, ogg_packet * packet)
{ {
guint8 *data = packet->packet; guint8 *data = packet->packet;
guint chans;
data += 1 + 6 + 4 + 1; data += 1 + 6 + 4;
chans = GST_READ_UINT8 (data);
data += 1;
pad->granulerate_n = GST_READ_UINT32_LE (data); pad->granulerate_n = GST_READ_UINT32_LE (data);
pad->granulerate_d = 1; pad->granulerate_d = 1;
pad->granuleshift = 0; pad->granuleshift = 0;
@ -457,7 +460,8 @@ setup_vorbis_mapper (GstOggStream * pad, ogg_packet * packet)
parse_vorbis_header_packet (pad, packet); parse_vorbis_header_packet (pad, packet);
pad->caps = gst_caps_new_simple ("audio/x-vorbis", pad->caps = gst_caps_new_simple ("audio/x-vorbis",
"rate", G_TYPE_INT, pad->granulerate_n, NULL); "rate", G_TYPE_INT, pad->granulerate_n, "channels", G_TYPE_INT, chans,
NULL);
return TRUE; return TRUE;
} }
@ -507,12 +511,17 @@ static gboolean
setup_speex_mapper (GstOggStream * pad, ogg_packet * packet) setup_speex_mapper (GstOggStream * pad, ogg_packet * packet)
{ {
guint8 *data = packet->packet; guint8 *data = packet->packet;
guint chans;
data += 8 + 20 + 4 + 4; data += 8 + 20 + 4 + 4;
pad->granulerate_n = GST_READ_UINT32_LE (data); pad->granulerate_n = GST_READ_UINT32_LE (data);
pad->granulerate_d = 1; pad->granulerate_d = 1;
pad->granuleshift = 0; pad->granuleshift = 0;
GST_LOG ("sample rate: %d", pad->granulerate_n);
data += 4 + 4 + 4;
chans = GST_READ_UINT32_LE (data);
GST_LOG ("sample rate: %d, channels: %u", pad->granulerate_n, chans);
pad->n_header_packets = GST_READ_UINT32_LE (packet->packet + 68) + 2; pad->n_header_packets = GST_READ_UINT32_LE (packet->packet + 68) + 2;
pad->frame_size = GST_READ_UINT32_LE (packet->packet + 64) * pad->frame_size = GST_READ_UINT32_LE (packet->packet + 64) *
@ -521,8 +530,8 @@ setup_speex_mapper (GstOggStream * pad, ogg_packet * packet)
if (pad->granulerate_n == 0) if (pad->granulerate_n == 0)
return FALSE; return FALSE;
pad->caps = gst_caps_new_simple ("audio/x-speex", pad->caps = gst_caps_new_simple ("audio/x-speex", "rate", G_TYPE_INT,
"rate", G_TYPE_INT, pad->granulerate_n, NULL); pad->granulerate_n, "channels", G_TYPE_INT, chans, NULL);
return TRUE; return TRUE;
} }
@ -541,21 +550,24 @@ static gboolean
setup_flac_mapper (GstOggStream * pad, ogg_packet * packet) setup_flac_mapper (GstOggStream * pad, ogg_packet * packet)
{ {
guint8 *data = packet->packet; guint8 *data = packet->packet;
guint chans;
/* see http://flac.sourceforge.net/ogg_mapping.html */ /* see http://flac.sourceforge.net/ogg_mapping.html */
pad->granulerate_n = (GST_READ_UINT32_BE (data + 27) & 0xFFFFF000) >> 12; pad->granulerate_n = (GST_READ_UINT32_BE (data + 27) & 0xFFFFF000) >> 12;
pad->granulerate_d = 1; pad->granulerate_d = 1;
pad->granuleshift = 0; pad->granuleshift = 0;
GST_DEBUG ("sample rate: %d", pad->granulerate_n); chans = ((GST_READ_UINT32_BE (data + 27) & 0x00000E00) >> 9) + 1;
GST_DEBUG ("sample rate: %d, channels: %u", pad->granulerate_n, chans);
pad->n_header_packets = GST_READ_UINT16_BE (packet->packet + 7); pad->n_header_packets = GST_READ_UINT16_BE (packet->packet + 7);
if (pad->granulerate_n == 0) if (pad->granulerate_n == 0)
return FALSE; return FALSE;
pad->caps = gst_caps_new_simple ("audio/x-flac", pad->caps = gst_caps_new_simple ("audio/x-flac", "rate", G_TYPE_INT,
"rate", G_TYPE_INT, pad->granulerate_n, NULL); pad->granulerate_n, "channels", G_TYPE_INT, chans, NULL);
return TRUE; return TRUE;
} }