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(&fn->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;