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audio: add support for AAC pass-through

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=694443
This commit is contained in:
Akihiro Tsukada 2013-02-22 21:02:19 +09:00 committed by Tim-Philipp Müller
parent 1056304aad
commit a32877125f
2 changed files with 56 additions and 1 deletions
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42
gst-libs/gst/audio/gstaudioiec61937.c
View file

@ -40,6 +40,7 @@
#define IEC61937_HEADER_SIZE 8
#define IEC61937_PAYLOAD_SIZE_AC3 (1536 * 4)
#define IEC61937_PAYLOAD_SIZE_EAC3 (6144 * 4)
#define IEC61937_PAYLOAD_SIZE_AAC (1024 * 4)
static gint
caps_get_int_field (const GstCaps * caps, const gchar * field)
@ -123,6 +124,12 @@ gst_audio_iec61937_frame_size (const GstAudioRingBufferSpec * spec)
return frames * 4;
}
case GST_AUDIO_RING_BUFFER_FORMAT_TYPE_MPEG2_AAC:
case GST_AUDIO_RING_BUFFER_FORMAT_TYPE_MPEG4_AAC:
{
return IEC61937_PAYLOAD_SIZE_AAC;
}
default:
return 0;
}
@ -287,6 +294,41 @@ gst_audio_iec61937_payload (const guint8 * src, guint src_n, guint8 * dst,
break;
}
case GST_AUDIO_RING_BUFFER_FORMAT_TYPE_MPEG2_AAC:
/* HACK. disguising MPEG4 AAC as MPEG2 AAC seems to work. */
/* TODO: set the right Pc,Pd for MPEG4 in accordance with IEC61937-6 */
case GST_AUDIO_RING_BUFFER_FORMAT_TYPE_MPEG4_AAC:
{
int num_rd_blks;
g_return_val_if_fail (src_n >= 7, FALSE);
num_rd_blks = (src[6] & 0x03) + 1;
/* Pc: bit 13-15 - stream number (0)
* bit 11-12 - reserved (0)
* bit 8-10 - reserved? (0) */
dst[four] = 0;
/* Pc: bit 7 - error bit (0)
* bit 5-6 - reserved (0)
* bit 0-4 - data type (07 = MPEG2 AAC ADTS
* 19 = MPEG2 AAC ADTS half-rate LSF
* 51 = MPEG2 AAC ADTS quater-rate LSF */
if (num_rd_blks == 1)
dst[five] = 0x07;
else if (num_rd_blks == 2)
dst[five] = 0x13;
else if (num_rd_blks == 4)
dst[five] = 0x33;
else
g_return_val_if_reached (FALSE);
/* Pd: bit 15-0 - frame size in bits */
tmp = GST_ROUND_UP_2 (src_n) * 8;
dst[six] = (guint8) (tmp >> 8);
dst[seven] = (guint8) (tmp & 0xff);
break;
}
default:
return FALSE;
}

15
gst-libs/gst/audio/gstaudioringbuffer.c
View file

@ -124,7 +124,9 @@ static const gchar *format_type_names[] = {
"iec958",
"ac3",
"eac3",
"dts"
"dts",
"aac mpeg2",
"aac mpeg4"
};
#endif
@ -263,6 +265,17 @@ gst_audio_ring_buffer_parse_caps (GstAudioRingBufferSpec * spec, GstCaps * caps)
spec->type = GST_AUDIO_RING_BUFFER_FORMAT_TYPE_MPEG;
info.bpf = 4;
} else if (g_str_equal (mimetype, "audio/mpeg") &&
gst_structure_get_int (structure, "mpegversion", &i) &&
(i == 2 || i == 4) &&
!g_strcmp0 (gst_structure_get_string (structure, "stream-format"),
"adts")) {
/* MPEG-2 AAC or MPEG-4 AAC */
if (!(gst_structure_get_int (structure, "rate", &info.rate)))
goto parse_error;
spec->type = (i == 2) ? GST_AUDIO_RING_BUFFER_FORMAT_TYPE_MPEG2_AAC :
GST_AUDIO_RING_BUFFER_FORMAT_TYPE_MPEG4_AAC;
info.bpf = 4;
} else {
goto parse_error;
}