2 * Copyright (C) 2005-2011 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 sample_rate;
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 fn->private_data = para_calloc(sizeof(struct private_oggdec_data));
99 static void ogg_close(struct filter_node *fn)
101 struct private_oggdec_data *pod = fn->private_data;
103 if (pod && pod->vf) {
104 PARA_DEBUG_LOG("ov_clearing %p, pod = %p\n", pod->vf, pod);
109 PARA_DEBUG_LOG("nothing to close\n");
111 fn->private_data = NULL;
114 static int oggdec_execute(struct btr_node *btrn, const char *cmd, char **result)
116 struct filter_node *fn = btr_context(btrn);
117 struct private_oggdec_data *pod = fn->private_data;
119 return decoder_execute(cmd, pod->sample_rate, pod->channels, result);
122 static int ogg_init(struct filter_node *fn)
124 struct private_oggdec_data *pod = fn->private_data;
125 struct btr_node *btrn = fn->btrn;
128 struct OggVorbis_File *vf = para_malloc(sizeof(*vf));
130 PARA_NOTICE_LOG("iqs: %zu, min_iqs: %zu, opening ov callbacks\n",
131 btr_get_input_queue_size(btrn), fn->min_iqs);
133 oret = ov_open_callbacks(fn, vf,
134 NULL, /* no initial buffer */
135 0, /* no initial bytes */
136 ovc); /* the ov_open_callbacks */
137 if (oret == OV_ENOTVORBIS || oret == OV_EBADHEADER) {
138 /* this might be due to the input buffer being too small */
139 if (!btr_no_parent(btrn)) {
141 iqs = btr_get_input_queue_size(btrn);
143 if (iqs < fn->min_iqs)
145 PARA_CRIT_LOG("iqs: %zu\n", iqs);
146 btr_merge(btrn, fn->min_iqs);
150 ret = (oret == OV_ENOTVORBIS)?
151 -E_OGGDEC_NOTVORBIS : -E_OGGDEC_BADHEADER;
154 ret = -E_OGGDEC_READ;
155 if (oret == OV_EREAD)
157 ret = -E_OGGDEC_VERSION;
158 if (oret == OV_EVERSION)
160 ret = -E_OGGDEC_FAULT;
163 pod->channels = ov_info(vf, 0)->channels;
164 pod->sample_rate = ov_info(vf, 0)->rate;
165 PARA_NOTICE_LOG("%d channels, %d Hz\n", pod->channels,
172 btr_consume(btrn, pod->converted);
180 static void ogg_pre_select(__a_unused struct sched *s, struct task *t)
182 struct filter_node *fn = container_of(t, struct filter_node, task);
186 ret = btr_node_status(fn->btrn, fn->min_iqs, BTR_NT_INTERNAL);
190 sched_request_timeout_ms(100, s);
193 #define OGGDEC_MAX_OUTPUT_SIZE (128 * 1024)
194 #define OGGDEC_OUTPUT_CHUNK_SIZE (32 * 1024)
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;
204 ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
210 btr_merge(btrn, fn->min_iqs);
215 buf = para_malloc(OGGDEC_OUTPUT_CHUNK_SIZE);
217 ret = ov_read(pod->vf, buf + have, OGGDEC_OUTPUT_CHUNK_SIZE - have,
218 ENDIAN, 2 /* 16 bit */, 1 /* signed */, NULL);
219 btr_consume(btrn, pod->converted);
225 if (have < OGGDEC_OUTPUT_CHUNK_SIZE)
227 if (btr_get_output_queue_size(btrn) > OGGDEC_MAX_OUTPUT_SIZE)
229 btr_add_output(buf, have, btrn);
230 buf = para_malloc(OGGDEC_OUTPUT_CHUNK_SIZE);
234 btr_add_output(buf, have, btrn);
237 if (ret == OV_HOLE) /* avoid buffer underruns */
239 if (ret >= 0 || ret == OV_HOLE)
241 ret = -E_OGGDEC_BADLINK;
245 btr_remove_node(btrn);
249 * The init function of the ogg vorbis decoder.
251 * \param f Its fields are filled in by the function.
253 void oggdec_filter_init(struct filter *f)
256 f->close = ogg_close;
257 f->pre_select = ogg_pre_select;
258 f->post_select = ogg_post_select;
259 f->execute = oggdec_execute;