315f338ced283c063d9012e20040fb0b3f0b82a1
[paraslash.git] / aacdec.c
1 /*
2 * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
17 */
18
19 /*
20 * based in parts on libfaad, Copyright (C) 2003-2005 M. Bakker,
21 * Ahead Software AG
22 */
23
24 /** \file aacdec.c paraslash's mp3 decoder */
25
26 #include "para.h"
27
28 #include "list.h"
29 #include "filter.h"
30 #include "error.h"
31 #include "string.h"
32 #include "aac.h"
33
34 /** the output buffer size */
35 #define MAX_CHANNELS 6
36 #define AAC_OUTBUF_SIZE (FAAD_MIN_STREAMSIZE * MAX_CHANNELS)
37
38 /**
39 * data specific to the aacdec filter
40 *
41 * \sa filter, filter_node
42 */
43 struct private_mp4dec_data {
44 NeAACDecHandle decoder;
45 NeAACDecFrameInfo frame_info;
46
47 int initialized;
48 int decoder_length;
49 int consumed;
50 long unsigned consumed_total;
51
52 long unsigned entry;
53 };
54
55 static ssize_t mp4dec(char *input_buffer, size_t len, struct filter_node *fn)
56 {
57 struct private_mp4dec_data *padd = fn->private_data;
58 struct filter_chain_info *fci = fn->fci;
59 unsigned long rate = 0;
60 unsigned char channels = 0;
61 int i, ret, skip;
62 unsigned char *p, *outbuffer;
63 unsigned char *inbuf = (unsigned char*)input_buffer;
64
65 if (fn->loaded > fn->bufsize * 4 / 5)
66 return 0;
67 if (len < 1000 && !*fci->eof)
68 return 0;
69 padd->consumed = 0;
70
71 if (!padd->initialized) {
72 padd->decoder_length = aac_find_esds(inbuf, len, &skip);
73 PARA_INFO_LOG("decoder len: %d\n", padd->decoder_length);
74 if (padd->decoder_length < 0) {
75 ret = NeAACDecInit(padd->decoder, inbuf,
76 len, &rate, &channels);
77 PARA_INFO_LOG("decoder init: %d\n", ret);
78 if (ret < 0) {
79 ret = -E_AACDEC_INIT;
80 goto out;
81 }
82 padd->consumed = ret;
83 } else {
84 padd->consumed += skip;
85 p = inbuf + padd->consumed;
86 ret = -E_AACDEC_INIT;
87 if (NeAACDecInit2(padd->decoder, p,
88 padd->decoder_length, &rate,
89 &channels) < 0)
90 goto out;
91 }
92 fci->samplerate = rate;
93 fci->channels = channels;
94 PARA_INFO_LOG("rate: %u, channels: %d\n",
95 fci->samplerate, fci->channels);
96 padd->initialized = 1;
97 }
98 if (padd->decoder_length > 0) {
99 padd->consumed = 0;
100 if (!padd->entry) {
101 ret = aac_find_stco(inbuf + padd->consumed,
102 len - padd->consumed, &skip);
103 if (ret < 0) {
104 ret = len;
105 goto out;
106 }
107 padd->consumed += skip;
108 padd->entry = aac_read_int32(inbuf + padd->consumed);
109 PARA_INFO_LOG("entry: %lu\n", padd->entry);
110 }
111 ret = len;
112 if (padd->consumed_total + len < padd->entry)
113 goto out;
114 if (padd->consumed_total < padd->entry)
115 padd->consumed = padd->entry - padd->consumed_total;
116 }
117 for (; padd->consumed < len; padd->consumed++)
118 if ((inbuf[padd->consumed] & 0xfe) == 0x20)
119 break;
120 if (padd->consumed >= len)
121 goto success;
122 p = inbuf + padd->consumed;
123 outbuffer = NeAACDecDecode(padd->decoder, &padd->frame_info, p,
124 len - padd->consumed);
125 ret = -E_AAC_DECODE;
126 if (padd->frame_info.error != 0) {
127 PARA_ERROR_LOG("frame_error: %d, consumed: %lu + %d + %lu\n",
128 padd->frame_info.error, padd->consumed_total,
129 padd->consumed, padd->frame_info.bytesconsumed);
130 PARA_ERROR_LOG("%s\n", NeAACDecGetErrorMessage(
131 padd->frame_info.error));
132 padd->consumed++; /* catch 21 */
133 goto success;
134 }
135 padd->consumed += padd->frame_info.bytesconsumed;
136 ret = padd->consumed;
137 if (!padd->frame_info.samples)
138 goto out;
139 for (i = 0; i < padd->frame_info.samples; i++) {
140 short *s = (short *)outbuffer;
141 fn->buf[fn->loaded++] = s[i] & 0xff;
142 fn->buf[fn->loaded++] = (s[i] >> 8) & 0xff;
143 }
144 success:
145 ret = padd->consumed;
146 out:
147 if (ret > 0)
148 padd->consumed_total += ret;
149 return ret;
150 }
151
152 static void mp4dec_open(struct filter_node *fn)
153 {
154 fn->private_data = para_calloc(sizeof(struct private_mp4dec_data));
155 struct private_mp4dec_data *padd = fn->private_data;
156
157 fn->bufsize = AAC_OUTBUF_SIZE;
158 fn->buf = para_calloc(fn->bufsize);
159 padd->decoder = aac_open();
160 }
161
162 static void mp4dec_close(struct filter_node *fn)
163 {
164 struct private_mp4dec_data *padd = fn->private_data;
165
166 NeAACDecClose(padd->decoder);
167 free(fn->buf);
168 fn->buf = NULL;
169 free(padd);
170 fn->private_data = NULL;
171 }
172
173 /**
174 * the init function of the mp3dec filter
175 *
176 * \sa filter::init
177 */
178 void aacdec_init(struct filter *f)
179 {
180 f->open = mp4dec_open;
181 f->convert = mp4dec;
182 f->close = mp4dec_close;
183 }