2 * Copyright (C) 2006-2012 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. */
19 #include "buffer_tree.h"
25 /** Give up decoding after that many errors. */
29 * data specific to the aacdec filter
31 * \sa filter, filter_node
33 struct private_aacdec_data
{
34 /** the return value of aac_open */
35 NeAACDecHandle handle
;
36 /** info about the currently decoded frame */
37 NeAACDecFrameInfo frame_info
;
38 /** whether this instance of the aac decoder is already initialized */
41 * return value of aac_find_esds(). Used to call the right aacdec
44 unsigned long decoder_length
;
45 /** number of times the decoder returned an error */
47 /** number of bytes already consumed from the imput stream */
48 size_t consumed_total
;
49 /** return value of aac_find_entry_point */
51 /** The number of channels of the current stream. */
52 unsigned int channels
;
53 /** Current sample rate in Hz. */
54 unsigned int sample_rate
;
57 static int aacdec_execute(struct btr_node
*btrn
, const char *cmd
, char **result
)
59 struct filter_node
*fn
= btr_context(btrn
);
60 struct private_aacdec_data
*padd
= fn
->private_data
;
62 return decoder_execute(cmd
, padd
->sample_rate
, padd
->channels
, result
);
65 static void aacdec_open(struct filter_node
*fn
)
67 struct private_aacdec_data
*padd
= para_calloc(sizeof(*padd
));
69 fn
->private_data
= padd
;
71 padd
->handle
= aac_open();
74 static void aacdec_close(struct filter_node
*fn
)
76 struct private_aacdec_data
*padd
= fn
->private_data
;
78 NeAACDecClose(padd
->handle
);
80 fn
->private_data
= NULL
;
83 static void aacdec_post_select(__a_unused
struct sched
*s
, struct task
*t
)
85 struct filter_node
*fn
= container_of(t
, struct filter_node
, task
);
86 struct btr_node
*btrn
= fn
->btrn
;
87 struct private_aacdec_data
*padd
= fn
->private_data
;
89 unsigned char *p
, *inbuf
, *outbuffer
;
91 size_t len
, skip
, consumed
, loaded
;
95 ret
= btr_node_status(btrn
, fn
->min_iqs
, BTR_NT_INTERNAL
);
100 btr_merge(btrn
, fn
->min_iqs
);
101 len
= btr_next_buffer(btrn
, (char **)&inbuf
);
102 len
= PARA_MIN(len
, (size_t)8192);
104 if (!padd
->initialized
) {
105 unsigned long rate
= 0;
106 unsigned char channels
= 0;
107 ret
= aac_find_esds(inbuf
, len
, &skip
, &padd
->decoder_length
);
109 PARA_INFO_LOG("%s\n", para_strerror(-ret
));
110 ret
= NeAACDecInit(padd
->handle
, inbuf
,
111 len
, &rate
, &channels
);
112 PARA_INFO_LOG("decoder init: %d\n", ret
);
114 ret
= -E_AACDEC_INIT
;
119 PARA_INFO_LOG("decoder len: %lu\n",
120 padd
->decoder_length
);
122 p
= inbuf
+ consumed
;
123 ret
= -E_AACDEC_INIT
;
124 if (NeAACDecInit2(padd
->handle
, p
,
125 padd
->decoder_length
, &rate
,
129 padd
->sample_rate
= rate
;
130 padd
->channels
= channels
;
131 PARA_INFO_LOG("rate: %u, channels: %d\n",
132 padd
->sample_rate
, padd
->channels
);
133 padd
->initialized
= 1;
135 if (padd
->decoder_length
> 0) {
138 ret
= aac_find_entry_point(inbuf
+ consumed
,
139 len
- consumed
, &skip
);
146 PARA_INFO_LOG("entry: %zu\n", padd
->entry
);
149 if (padd
->consumed_total
+ len
< padd
->entry
)
151 if (padd
->consumed_total
< padd
->entry
)
152 consumed
= padd
->entry
- padd
->consumed_total
;
154 for (; consumed
< len
; consumed
++)
155 if ((inbuf
[consumed
] & 0xfe) == 0x20)
159 p
= inbuf
+ consumed
;
160 //PARA_CRIT_LOG("consumed: %zu (%zu + %zu), have: %zu\n", padd->consumed_total + consumed,
161 // padd->consumed_total, consumed, len - consumed);
162 outbuffer
= NeAACDecDecode(padd
->handle
, &padd
->frame_info
, p
,
164 if (padd
->frame_info
.error
) {
165 int err
= padd
->frame_info
.error
;
167 if (padd
->error_count
++ > MAX_ERRORS
)
169 /* Suppress non-fatal bitstream error message at BOF/EOF */
170 if (len
< fn
->min_iqs
|| padd
->consumed_total
== 0) {
174 PARA_ERROR_LOG("%s\n", NeAACDecGetErrorMessage(err
));
175 PARA_ERROR_LOG("consumed: %zu + %zd + %lu\n",
176 padd
->consumed_total
, consumed
,
177 padd
->frame_info
.bytesconsumed
);
179 consumed
++; /* catch 21 */
182 padd
->error_count
= 0;
183 //PARA_CRIT_LOG("decoder ate %lu\n", padd->frame_info.bytesconsumed);
184 consumed
+= padd
->frame_info
.bytesconsumed
;
186 if (!padd
->frame_info
.samples
)
188 btr_buf
= para_malloc(2 * padd
->frame_info
.samples
);
190 for (i
= 0; i
< padd
->frame_info
.samples
; i
++) {
191 short sh
= ((short *)outbuffer
)[i
];
192 write_int16_host_endian(btr_buf
+ loaded
, sh
);
195 btr_add_output(btr_buf
, loaded
, btrn
);
200 padd
->consumed_total
+= ret
;
201 btr_consume(btrn
, ret
);
207 btr_remove_node(btrn
);
211 * The init function of the aacdec filter.
213 * \param f Pointer to the filter struct to initialize.
217 void aacdec_filter_init(struct filter
*f
)
219 f
->open
= aacdec_open
;
220 f
->close
= aacdec_close
;
221 f
->pre_select
= generic_filter_pre_select
;
222 f
->post_select
= aacdec_post_select
;
223 f
->execute
= aacdec_execute
;