2 * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
19 * based in parts on libfaad, Copyright (C) 2003-2005 M. Bakker,
23 /** \file aacdec.c paraslash's aac (m4a) decoder */
34 /** the output buffer size */
35 #define AAC_OUTBUF_SIZE (32 * 1024)
40 * data specific to the aacdec filter
42 * \sa filter, filter_node
44 struct private_aacdec_data
{
45 NeAACDecHandle handle
;
46 NeAACDecFrameInfo frame_info
;
51 size_t consumed_total
;
55 static ssize_t
aacdec(char *input_buffer
, size_t len
, struct filter_node
*fn
)
57 struct private_aacdec_data
*padd
= fn
->private_data
;
58 struct filter_chain
*fc
= fn
->fc
;
60 unsigned char *p
, *outbuffer
;
61 unsigned char *inbuf
= (unsigned char*)input_buffer
;
62 size_t skip
, consumed
= 0;
64 if (fn
->loaded
> fn
->bufsize
* 3 / 5)
66 if (len
< 2048 && !*fc
->input_eof
)
69 if (!padd
->initialized
) {
70 unsigned long rate
= 0;
71 unsigned char channels
= 0;
72 padd
->decoder_length
= aac_find_esds(inbuf
, len
, &skip
);
73 PARA_INFO_LOG("decoder len: %d\n", padd
->decoder_length
);
74 if (padd
->decoder_length
< 0) {
75 ret
= NeAACDecInit(padd
->handle
, inbuf
,
76 len
, &rate
, &channels
);
77 PARA_INFO_LOG("decoder init: %d\n", ret
);
87 if (NeAACDecInit2(padd
->handle
, p
,
88 padd
->decoder_length
, &rate
,
92 fc
->samplerate
= rate
;
93 fc
->channels
= channels
;
94 PARA_INFO_LOG("rate: %u, channels: %d\n",
95 fc
->samplerate
, fc
->channels
);
96 padd
->initialized
= 1;
98 if (padd
->decoder_length
> 0) {
101 ret
= aac_find_entry_point(inbuf
+ consumed
,
102 len
- consumed
, &skip
);
109 PARA_INFO_LOG("entry: %zu\n", padd
->entry
);
112 if (padd
->consumed_total
+ len
< padd
->entry
)
114 if (padd
->consumed_total
< padd
->entry
)
115 consumed
= padd
->entry
- padd
->consumed_total
;
117 for (; consumed
< len
; consumed
++)
118 if ((inbuf
[consumed
] & 0xfe) == 0x20)
122 p
= inbuf
+ consumed
;
123 outbuffer
= NeAACDecDecode(padd
->handle
, &padd
->frame_info
, p
,
125 if (padd
->frame_info
.error
) {
127 if (padd
->error_count
++ > MAX_ERRORS
)
129 PARA_ERROR_LOG("frame_error: %d, consumed: %zu + %zd + %lu\n",
130 padd
->frame_info
.error
, padd
->consumed_total
,
131 consumed
, padd
->frame_info
.bytesconsumed
);
132 PARA_ERROR_LOG("%s\n", NeAACDecGetErrorMessage(
133 padd
->frame_info
.error
));
134 consumed
++; /* catch 21 */
137 padd
->error_count
= 0;
138 consumed
+= padd
->frame_info
.bytesconsumed
;
140 if (!padd
->frame_info
.samples
)
142 ret
= -E_AAC_OVERRUN
;
143 if (padd
->frame_info
.samples
* 2 + fn
->loaded
> fn
->bufsize
)
145 for (i
= 0; i
< padd
->frame_info
.samples
; i
++) {
146 short *s
= (short *)outbuffer
;
147 fn
->buf
[fn
->loaded
++] = s
[i
] & 0xff;
148 fn
->buf
[fn
->loaded
++] = (s
[i
] >> 8) & 0xff;
154 padd
->consumed_total
+= ret
;
158 static void aacdec_open(struct filter_node
*fn
)
160 fn
->private_data
= para_calloc(sizeof(struct private_aacdec_data
));
161 struct private_aacdec_data
*padd
= fn
->private_data
;
163 fn
->bufsize
= AAC_OUTBUF_SIZE
;
164 fn
->buf
= para_calloc(fn
->bufsize
);
165 padd
->handle
= aac_open();
168 static void aacdec_close(struct filter_node
*fn
)
170 struct private_aacdec_data
*padd
= fn
->private_data
;
172 NeAACDecClose(padd
->handle
);
176 fn
->private_data
= NULL
;
180 * the init function of the aacdec filter
184 void aacdec_init(struct filter
*f
)
186 f
->open
= aacdec_open
;
188 f
->close
= aacdec_close
;