2 * Copyright (C) 2005-2010 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file oggdec_filter.c Paraslash's ogg vorbis decoder. */
10 #include <vorbis/vorbisfile.h>
17 #include "buffer_tree.h"
22 /** Determine byte sex. */
23 #ifdef WORDS_BIGENDIAN
29 /** Data specific to the oggdec filter. */
30 struct private_oggdec_data
{
31 /** Describes an ogg vorbis file. */
33 /** The number of bytes consumed from the input buffer. */
35 /** The number of channels of the current stream. */
36 unsigned int channels
;
37 /** Current sample rate in Hz. */
38 unsigned int samplerate
;
41 static size_t cb_read(void *buf
, size_t size
, size_t nmemb
, void *datasource
)
43 struct filter_node
*fn
= datasource
;
44 struct private_oggdec_data
*pod
= fn
->private_data
;
45 struct btr_node
*btrn
= fn
->btrn
;
47 size_t nbytes
= btr_next_buffer(btrn
, &btr_buf
), tmp
;
50 * oggvorbis always uses size == 1. Other sizes would complicate the code
51 * for no real gain. So we simply don't support size != 1.
54 assert(pod
->converted
<= nbytes
);
55 tmp
= nbytes
- pod
->converted
;
56 PARA_DEBUG_LOG("vorbis requests %zu bytes have %zu\n", nmemb
, tmp
);
57 tmp
= PARA_MIN(tmp
, nmemb
);
60 memcpy(buf
, btr_buf
+ pod
->converted
, tmp
);
61 pod
->converted
+= tmp
;
66 * Custom data seeking function.
68 * Since we want the data source to be treated as unseekable at all
69 * times, the provided seek callback always returns -1 (failure).
71 static int cb_seek(__a_unused
void *datasource
, __a_unused ogg_int64_t offset
,
72 __a_unused
int whence
)
77 static int cb_close(__a_unused
void *datasource
)
82 static const ov_callbacks ovc
= {
85 .close_func
= cb_close
,
87 * The tell function need not be provided if the data IO abstraction is
93 static void ogg_open(struct filter_node
*fn
)
95 struct private_oggdec_data
*pod
= para_calloc(
96 sizeof(struct private_oggdec_data
));
98 fn
->private_data
= pod
;
102 static void ogg_close(struct filter_node
*fn
)
104 struct private_oggdec_data
*pod
= fn
->private_data
;
106 PARA_DEBUG_LOG("ov_clearing %p, pod = %p\n", pod
->vf
, pod
);
111 PARA_DEBUG_LOG("nothing to close\n");
112 free(fn
->private_data
);
113 fn
->private_data
= NULL
;
116 #define OGGDEC_OUTPUT_CHUNK_SIZE (64 * 1024)
118 static int oggdec_execute(struct btr_node
*btrn
, const char *cmd
, char **result
)
120 struct filter_node
*fn
= btr_context(btrn
);
121 struct private_oggdec_data
*pod
= fn
->private_data
;
123 if (!strcmp(cmd
, "samplerate")) {
124 if (pod
->samplerate
== 0)
125 return -E_BTR_NAVAIL
;
126 *result
= make_message("%u", pod
->samplerate
);
129 if (!strcmp(cmd
, "channels")) {
130 if (pod
->channels
== 0)
131 return -E_BTR_NAVAIL
;
132 *result
= make_message("%u", pod
->channels
);
135 return -ERRNO_TO_PARA_ERROR(ENOTSUP
);
138 static int ogg_init(struct filter_node
*fn
)
140 struct private_oggdec_data
*pod
= fn
->private_data
;
141 struct btr_node
*btrn
= fn
->btrn
;
145 pod
->vf
= para_malloc(sizeof(struct OggVorbis_File
));
146 PARA_NOTICE_LOG("iqs: %zu, min_iqs: %zu, opening ov callbacks\n",
147 btr_get_input_queue_size(btrn
), fn
->min_iqs
);
149 oret
= ov_open_callbacks(fn
, pod
->vf
,
150 NULL
, /* no initial buffer */
151 0, /* no initial bytes */
152 ovc
); /* the ov_open_callbacks */
153 if (oret
== OV_ENOTVORBIS
|| oret
== OV_EBADHEADER
) {
154 /* this might be due to the input buffer being too small */
155 if (!btr_no_parent(btrn
)) {
157 iqs
= btr_get_input_queue_size(btrn
);
159 if (iqs
< fn
->min_iqs
)
161 PARA_CRIT_LOG("iqs: %zu\n", iqs
);
162 btr_merge(btrn
, fn
->min_iqs
);
166 ret
= (oret
== OV_ENOTVORBIS
)?
167 -E_OGGDEC_NOTVORBIS
: -E_OGGDEC_BADHEADER
;
170 ret
= -E_OGGDEC_READ
;
171 if (oret
== OV_EREAD
)
173 ret
= -E_OGGDEC_VERSION
;
174 if (oret
== OV_EVERSION
)
176 ret
= -E_OGGDEC_FAULT
;
179 pod
->channels
= ov_info(pod
->vf
, 0)->channels
;
180 pod
->samplerate
= ov_info(pod
->vf
, 0)->rate
;
181 PARA_NOTICE_LOG("%d channels, %d Hz\n", pod
->channels
,
189 btr_consume(btrn
, pod
->converted
);
196 static void ogg_post_select(__a_unused
struct sched
*s
, struct task
*t
)
198 struct filter_node
*fn
= container_of(t
, struct filter_node
, task
);
199 struct private_oggdec_data
*pod
= fn
->private_data
;
200 struct btr_node
*btrn
= fn
->btrn
;
205 ret
= ns
= btr_node_status(btrn
, fn
->min_iqs
, BTR_NT_INTERNAL
);
209 btr_merge(btrn
, fn
->min_iqs
);
215 char *out
= para_malloc(OGGDEC_OUTPUT_CHUNK_SIZE
);
216 ssize_t read_ret
= ov_read(pod
->vf
, out
, OGGDEC_OUTPUT_CHUNK_SIZE
,
217 ENDIAN
, 2 /* 16 bit */, 1 /* signed */, NULL
);
218 btr_consume(btrn
, pod
->converted
);
223 if (read_ret
== 0 || read_ret
== OV_HOLE
)
225 ret
= -E_OGGDEC_BADLINK
;
228 btr_add_output(out
, read_ret
, btrn
);
229 if (btr_get_output_queue_size(btrn
) > 640 * 1024)
230 return; /* enough data for the moment */
235 btr_remove_node(btrn
);
240 * The init function of the ogg vorbis decoder.
242 * \param f Its fields are filled in by the function.
244 void oggdec_filter_init(struct filter
*f
)
247 f
->close
= ogg_close
;
248 f
->pre_select
= generic_filter_pre_select
;
249 f
->post_select
= ogg_post_select
;
250 f
->execute
= oggdec_execute
;