2 * Copyright (C) 2006 Andre Noll <maan@tuebingen.mpg.de>
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 int aacdec_post_select(__a_unused struct sched *s, void *context)
85 struct filter_node *fn = context;
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;
94 ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
99 btr_merge(btrn, fn->min_iqs);
100 len = btr_next_buffer(btrn, (char **)&inbuf);
101 len = PARA_MIN(len, (size_t)8192);
103 if (!padd->initialized) {
104 unsigned long rate = 0;
105 unsigned char channels = 0;
106 ret = aac_find_esds(inbuf, len, &skip, &padd->decoder_length);
108 PARA_INFO_LOG("%s\n", para_strerror(-ret));
109 ret = NeAACDecInit(padd->handle, inbuf,
110 len, &rate, &channels);
111 PARA_INFO_LOG("decoder init: %d\n", ret);
113 ret = -E_AACDEC_INIT;
118 PARA_INFO_LOG("decoder len: %lu\n",
119 padd->decoder_length);
121 p = inbuf + consumed;
122 ret = -E_AACDEC_INIT;
123 if (NeAACDecInit2(padd->handle, p,
124 padd->decoder_length, &rate,
128 padd->sample_rate = rate;
129 padd->channels = channels;
130 PARA_INFO_LOG("rate: %u, channels: %d\n",
131 padd->sample_rate, padd->channels);
132 padd->initialized = 1;
134 if (padd->decoder_length > 0) {
137 ret = aac_find_entry_point(inbuf + consumed,
138 len - consumed, &skip);
145 PARA_INFO_LOG("entry: %zu\n", padd->entry);
148 if (padd->consumed_total + len < padd->entry)
150 if (padd->consumed_total < padd->entry)
151 consumed = padd->entry - padd->consumed_total;
153 for (; consumed < len; consumed++)
154 if ((inbuf[consumed] & 0xfe) == 0x20)
158 p = inbuf + consumed;
159 //PARA_CRIT_LOG("consumed: %zu (%zu + %zu), have: %zu\n", padd->consumed_total + consumed,
160 // padd->consumed_total, consumed, len - consumed);
161 outbuffer = NeAACDecDecode(padd->handle, &padd->frame_info, p,
163 if (padd->frame_info.error) {
164 int err = padd->frame_info.error;
166 if (padd->error_count++ > MAX_ERRORS)
168 /* Suppress non-fatal bitstream error message at BOF/EOF */
169 if (len < fn->min_iqs || padd->consumed_total == 0) {
173 PARA_ERROR_LOG("%s\n", NeAACDecGetErrorMessage(err));
174 PARA_ERROR_LOG("consumed: %zu + %zd + %lu\n",
175 padd->consumed_total, consumed,
176 padd->frame_info.bytesconsumed);
178 consumed++; /* catch 21 */
181 padd->error_count = 0;
182 //PARA_CRIT_LOG("decoder ate %lu\n", padd->frame_info.bytesconsumed);
183 consumed += padd->frame_info.bytesconsumed;
185 if (!padd->frame_info.samples)
187 btr_buf = para_malloc(2 * padd->frame_info.samples);
189 for (i = 0; i < padd->frame_info.samples; i++) {
190 short sh = ((short *)outbuffer)[i];
191 write_int16_host_endian(btr_buf + loaded, sh);
194 btr_add_output(btr_buf, loaded, btrn);
199 padd->consumed_total += ret;
200 btr_consume(btrn, ret);
205 btr_remove_node(&fn->btrn);
210 * The init function of the aacdec filter.
212 * \param f Pointer to the filter struct to initialize.
216 void aacdec_filter_init(struct filter *f)
218 f->open = aacdec_open;
219 f->close = aacdec_close;
220 f->pre_select = generic_filter_pre_select;
221 f->post_select = aacdec_post_select;
222 f->execute = aacdec_execute;