2 * Copyright (C) 2006-2009 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. */
24 /** the output buffer size */
25 #define AAC_OUTBUF_SIZE (32 * 1024)
27 /** give up decoding after that many errors */
31 * data specific to the aacdec filter
33 * \sa filter, filter_node
35 struct private_aacdec_data {
36 /** the return value of aac_open */
37 NeAACDecHandle handle;
38 /** info about the currently decoded frame */
39 NeAACDecFrameInfo frame_info;
40 /** whether this instance of the aac decoder is already initialized */
43 * return value of aac_find_esds(). Used to call the right aacdec
46 unsigned long decoder_length;
47 /** number of times the decoder returned an error */
49 /** number of bytes already consumed from the imput stream */
50 size_t consumed_total;
51 /** return value of aac_find_entry_point */
55 static ssize_t aacdec(char *input_buffer, size_t len, struct filter_node *fn)
57 struct private_aacdec_data *padd = fn->private_data;
58 struct filter_chain *fc = fn->fc;
60 unsigned char *p, *outbuffer;
61 unsigned char *inbuf = (unsigned char*)input_buffer;
62 size_t skip, consumed = 0;
64 if (fn->loaded > fn->bufsize * 3 / 5)
66 ret = *fc->input_error;
72 if (!padd->initialized) {
73 unsigned long rate = 0;
74 unsigned char channels = 0;
75 ret = aac_find_esds(inbuf, len, &skip, &padd->decoder_length);
77 PARA_INFO_LOG("%s\n", para_strerror(-ret));
78 ret = NeAACDecInit(padd->handle, inbuf,
79 len, &rate, &channels);
80 PARA_INFO_LOG("decoder init: %d\n", ret);
87 PARA_INFO_LOG("decoder len: %lu\n",
88 padd->decoder_length);
92 if (NeAACDecInit2(padd->handle, p,
93 padd->decoder_length, &rate,
97 fc->samplerate = rate;
98 fc->channels = channels;
99 PARA_INFO_LOG("rate: %u, channels: %d\n",
100 fc->samplerate, fc->channels);
101 padd->initialized = 1;
103 if (padd->decoder_length > 0) {
106 ret = aac_find_entry_point(inbuf + consumed,
107 len - consumed, &skip);
114 PARA_INFO_LOG("entry: %zu\n", padd->entry);
117 if (padd->consumed_total + len < padd->entry)
119 if (padd->consumed_total < padd->entry)
120 consumed = padd->entry - padd->consumed_total;
122 for (; consumed < len; consumed++)
123 if ((inbuf[consumed] & 0xfe) == 0x20)
127 p = inbuf + consumed;
128 outbuffer = NeAACDecDecode(padd->handle, &padd->frame_info, p,
130 if (padd->frame_info.error) {
132 if (padd->error_count++ > MAX_ERRORS)
134 PARA_ERROR_LOG("frame_error: %d, consumed: %zu + %zd + %lu\n",
135 padd->frame_info.error, padd->consumed_total,
136 consumed, padd->frame_info.bytesconsumed);
137 PARA_ERROR_LOG("%s\n", NeAACDecGetErrorMessage(
138 padd->frame_info.error));
139 consumed++; /* catch 21 */
142 padd->error_count = 0;
143 consumed += padd->frame_info.bytesconsumed;
145 if (!padd->frame_info.samples)
147 ret = -E_AAC_OVERRUN;
148 if (padd->frame_info.samples * 2 + fn->loaded > fn->bufsize)
150 for (i = 0; i < padd->frame_info.samples; i++) {
151 short *s = (short *)outbuffer;
152 write_int16_host_endian(fn->buf + fn->loaded, s[i]);
159 padd->consumed_total += ret;
163 static void aacdec_open(struct filter_node *fn)
165 struct private_aacdec_data *padd = para_calloc(sizeof(*padd));
167 fn->private_data = padd;
168 fn->bufsize = AAC_OUTBUF_SIZE;
169 fn->buf = para_calloc(fn->bufsize);
170 padd->handle = aac_open();
173 static void aacdec_close(struct filter_node *fn)
175 struct private_aacdec_data *padd = fn->private_data;
177 NeAACDecClose(padd->handle);
181 fn->private_data = NULL;
185 * the init function of the aacdec filter
187 * \param f pointer to the filter struct to initialize
191 void aacdec_filter_init(struct filter *f)
193 f->open = aacdec_open;
195 f->close = aacdec_close;