2 * Copyright (C) 2006-2010 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 * based in parts on libfaad, Copyright (C) 2003-2005 M. Bakker,
11 /** \file aacdec_filter.c paraslash's aac (m4a) decoder. */
20 #include "buffer_tree.h"
26 /** Give up decoding after that many errors. */
30 * data specific to the aacdec filter
32 * \sa filter, filter_node
34 struct private_aacdec_data
{
35 /** the return value of aac_open */
36 NeAACDecHandle handle
;
37 /** info about the currently decoded frame */
38 NeAACDecFrameInfo frame_info
;
39 /** whether this instance of the aac decoder is already initialized */
42 * return value of aac_find_esds(). Used to call the right aacdec
45 unsigned long decoder_length
;
46 /** number of times the decoder returned an error */
48 /** number of bytes already consumed from the imput stream */
49 size_t consumed_total
;
50 /** return value of aac_find_entry_point */
52 /** The number of channels of the current stream. */
53 unsigned int channels
;
54 /** Current sample rate in Hz. */
55 unsigned int samplerate
;
58 static int aacdec_execute(struct btr_node
*btrn
, const char *cmd
, char **result
)
60 struct filter_node
*fn
= btr_context(btrn
);
61 struct private_aacdec_data
*padd
= fn
->private_data
;
63 if (!strcmp(cmd
, "samplerate")) {
64 if (padd
->samplerate
== 0)
66 *result
= make_message("%u", padd
->samplerate
);
69 if (!strcmp(cmd
, "channels")) {
70 if (padd
->channels
== 0)
72 *result
= make_message("%u", padd
->channels
);
75 return -ERRNO_TO_PARA_ERROR(ENOTSUP
);
78 static void aacdec_open(struct filter_node
*fn
)
80 struct private_aacdec_data
*padd
= para_calloc(sizeof(*padd
));
82 fn
->private_data
= padd
;
84 padd
->handle
= aac_open();
87 static void aacdec_close(struct filter_node
*fn
)
89 struct private_aacdec_data
*padd
= fn
->private_data
;
91 NeAACDecClose(padd
->handle
);
93 fn
->private_data
= NULL
;
96 static void aacdec_post_select(__a_unused
struct sched
*s
, struct task
*t
)
98 struct filter_node
*fn
= container_of(t
, struct filter_node
, task
);
99 struct btr_node
*btrn
= fn
->btrn
;
100 struct private_aacdec_data
*padd
= fn
->private_data
;
102 unsigned char *p
, *inbuf
, *outbuffer
;
104 size_t len
, skip
, consumed
, loaded
, iqs
;
108 ret
= btr_node_status(btrn
, fn
->min_iqs
, BTR_NT_INTERNAL
);
113 btr_merge(btrn
, fn
->min_iqs
);
114 len
= btr_next_buffer(btrn
, (char **)&inbuf
);
116 iqs
= btr_get_input_queue_size(btrn
);
117 if (!padd
->initialized
) {
118 unsigned long rate
= 0;
119 unsigned char channels
= 0;
120 ret
= aac_find_esds(inbuf
, len
, &skip
, &padd
->decoder_length
);
122 PARA_INFO_LOG("%s\n", para_strerror(-ret
));
123 ret
= NeAACDecInit(padd
->handle
, inbuf
,
124 len
, &rate
, &channels
);
125 PARA_INFO_LOG("decoder init: %d\n", ret
);
127 ret
= -E_AACDEC_INIT
;
132 PARA_INFO_LOG("decoder len: %lu\n",
133 padd
->decoder_length
);
135 p
= inbuf
+ consumed
;
136 ret
= -E_AACDEC_INIT
;
137 if (NeAACDecInit2(padd
->handle
, p
,
138 padd
->decoder_length
, &rate
,
142 padd
->samplerate
= rate
;
143 padd
->channels
= channels
;
144 PARA_INFO_LOG("rate: %u, channels: %d\n",
145 padd
->samplerate
, padd
->channels
);
146 padd
->initialized
= 1;
148 if (padd
->decoder_length
> 0) {
151 ret
= aac_find_entry_point(inbuf
+ consumed
,
152 len
- consumed
, &skip
);
159 PARA_INFO_LOG("entry: %zu\n", padd
->entry
);
162 if (padd
->consumed_total
+ len
< padd
->entry
)
164 if (padd
->consumed_total
< padd
->entry
)
165 consumed
= padd
->entry
- padd
->consumed_total
;
167 for (; consumed
< len
; consumed
++)
168 if ((inbuf
[consumed
] & 0xfe) == 0x20)
172 p
= inbuf
+ consumed
;
173 //PARA_CRIT_LOG("consumed: %zu (%zu + %zu), have: %zu\n", padd->consumed_total + consumed,
174 // padd->consumed_total, consumed, len - consumed);
175 outbuffer
= NeAACDecDecode(padd
->handle
, &padd
->frame_info
, p
,
177 if (padd
->frame_info
.error
) {
178 int err
= padd
->frame_info
.error
;
180 if (padd
->error_count
++ > MAX_ERRORS
)
182 PARA_ERROR_LOG("frame_error: %d (%s), consumed: %zu + %zd + %lu\n",
183 err
, NeAACDecGetErrorMessage(padd
->frame_info
.error
),
184 padd
->consumed_total
, consumed
,
185 padd
->frame_info
.bytesconsumed
);
186 PARA_ERROR_LOG("%s\n", NeAACDecGetErrorMessage(
187 padd
->frame_info
.error
));
188 consumed
++; /* catch 21 */
191 padd
->error_count
= 0;
192 //PARA_CRIT_LOG("decoder ate %lu\n", padd->frame_info.bytesconsumed);
193 consumed
+= padd
->frame_info
.bytesconsumed
;
195 if (!padd
->frame_info
.samples
)
197 btr_buf
= para_malloc(2 * padd
->frame_info
.samples
);
199 for (i
= 0; i
< padd
->frame_info
.samples
; i
++) {
200 short sh
= ((short *)outbuffer
)[i
];
201 write_int16_host_endian(btr_buf
+ loaded
, sh
);
204 btr_add_output(btr_buf
, loaded
, btrn
);
209 padd
->consumed_total
+= ret
;
210 btr_consume(btrn
, ret
);
216 btr_remove_node(btrn
);
220 * The init function of the aacdec filter.
222 * \param f Pointer to the filter struct to initialize.
226 void aacdec_filter_init(struct filter
*f
)
228 f
->open
= aacdec_open
;
229 f
->close
= aacdec_close
;
230 f
->pre_select
= generic_filter_pre_select
;
231 f
->post_select
= aacdec_post_select
;
232 f
->execute
= aacdec_execute
;