2 * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
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.
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.
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.
19 /** \file aacdec.c paraslash's mp3 decoder */
31 /** the output buffer size */
32 #define MAX_CHANNELS 6
33 #define AAC_OUTBUF_SIZE (FAAD_MIN_STREAMSIZE * MAX_CHANNELS)
36 * data specific to the aacdec filter
38 * \sa filter, filter_node
40 struct private_mp4dec_data {
41 NeAACDecHandle decoder;
42 NeAACDecConfigurationPtr config;
43 NeAACDecFrameInfo frame_info;
44 mp4AudioSpecificConfig mp4ASC;
50 long unsigned consumed_total;
57 static int read_mp4_descr_length(struct private_mp4dec_data *padd)
64 b = padd->inbuf[padd->consumed + numBytes];
66 length = (length << 7) | (b & 0x7F);
68 ((b & 0x80) && numBytes < 4);
69 padd->consumed += numBytes;
73 static int find_esds(struct private_mp4dec_data *padd)
75 for (; padd->consumed < padd->inbuf_len; padd->consumed++) {
76 char *p = padd->inbuf + padd->consumed;
79 if (p[0] != 'e' || p[1] != 's' || p[2] != 'd' || p[3] != 's')
82 p = padd->inbuf + padd->consumed;
83 PARA_INFO_LOG("found esds: %d, next: %x\n", padd->consumed, *p);
88 p = padd->inbuf + padd->consumed;
89 PARA_INFO_LOG("next: %x\n", *p);
93 p = padd->inbuf + padd->consumed;
94 PARA_INFO_LOG("next: %x\n", *p);
98 decoder_length = read_mp4_descr_length(padd);
99 PARA_INFO_LOG("decoder length: %d\n", decoder_length);
100 p = padd->inbuf + padd->consumed;
101 PARA_INFO_LOG("decoder data0: %x\n", *p & 0xff);
103 PARA_INFO_LOG("decoder data1: %x\n", *p & 0xff);
104 return decoder_length;
109 static int read_int32(struct private_mp4dec_data *padd, unsigned *result)
111 uint8_t *d = (uint8_t*)(padd->inbuf + padd->consumed);
112 if (padd->consumed + 4 > padd->inbuf_len)
115 *result = (d[0] << 24) | (d[1] << 16) | (d[2] << 8) | d[3];
119 static int fill_offset_table(struct private_mp4dec_data *padd)
123 for (i = padd->offset_pos; i < padd->noffsets; i++) {
124 ret = read_int32(padd, &padd->offset[i]);
127 PARA_DEBUG_LOG("offset #%d: %d\n", i, padd->offset[i]);
133 static int find_stco(struct private_mp4dec_data *padd)
137 for (; padd->consumed < padd->inbuf_len; padd->consumed++) {
138 char *p = padd->inbuf + padd->consumed;
140 if (p[0] != 's' || p[1] != 't' || p[2] != 'c' || p[3] != 'o')
142 PARA_INFO_LOG("found stco: %d\n", padd->consumed);
144 ret = read_int32(padd, &padd->noffsets);
145 padd->offset = para_malloc(padd->noffsets * sizeof(int));
146 PARA_INFO_LOG("num entries: %d\n", padd->noffsets);
152 static ssize_t mp4dec(char *inbuffer, size_t len, struct filter_node *fn)
154 struct private_mp4dec_data *padd = fn->private_data;
155 struct filter_chain_info *fci = fn->fci;
156 unsigned long rate = 0;
157 unsigned char channels = 0;
159 unsigned char *p, *outbuffer;
161 if (fn->loaded > fn->bufsize * 4 / 5)
163 if (len < 1000 && !*fci->eof)
166 padd->inbuf = inbuffer;
167 padd->inbuf_len = len;
169 if (!padd->initialized) {
170 ret = find_esds(padd);
174 p = inbuffer + padd->consumed;
176 if (NeAACDecInit2(padd->decoder, p, ret, &rate, &channels) < 0) {
177 PARA_INFO_LOG("header not found, consumed: %d\n",
181 fci->samplerate = rate;
182 fci->channels = channels;
183 PARA_INFO_LOG("rate: %u, channels: %d\n", fci->samplerate,
185 padd->initialized = 1;
188 if (!padd->offset_pos) {
190 if (find_stco(padd) < 0)
193 if (padd->offset_pos < padd->noffsets) {
194 fill_offset_table(padd);
195 ret = padd->consumed;
198 PARA_INFO_LOG("consumed total: %lu, first_chunk: %d\n",
199 padd->consumed_total, padd->offset[0]);
201 if (padd->consumed_total + len < padd->offset[0])
203 if (padd->consumed_total < padd->offset[0])
204 padd->consumed = padd->offset[0] - padd->consumed_total;
205 p = padd->inbuf + padd->consumed;
206 outbuffer = NeAACDecDecode(padd->decoder, &padd->frame_info, p,
207 len - padd->consumed);
208 PARA_INFO_LOG("frame_error: %d, consumed: %lu + %d + %lu\n",
209 padd->frame_info.error, padd->consumed_total,
210 padd->consumed, padd->frame_info.bytesconsumed);
212 if (padd->frame_info.error != 0) {
213 PARA_ERROR_LOG("%s\n", NeAACDecGetErrorMessage(
214 padd->frame_info.error));
217 padd->consumed += padd->frame_info.bytesconsumed;
218 ret = padd->consumed;
219 if (!padd->frame_info.samples)
221 nbytes = padd->frame_info.samples;
222 for (i = 0; i < padd->frame_info.samples; i++) {
223 short *s = (short *)outbuffer;
224 fn->buf[fn->loaded++] = s[i] & 0xff;
225 fn->buf[fn->loaded++] = (s[i] >> 8) & 0xff;
227 ret = padd->consumed;
230 padd->consumed_total += ret;
234 static void mp4dec_open(struct filter_node *fn)
236 fn->private_data = para_calloc(sizeof(struct private_mp4dec_data));
237 struct private_mp4dec_data *padd = fn->private_data;
239 fn->bufsize = AAC_OUTBUF_SIZE;
240 fn->buf = para_calloc(fn->bufsize);
242 padd->decoder = NeAACDecOpen();
243 padd->config = NeAACDecGetCurrentConfiguration(padd->decoder);
244 padd->config->defObjectType = LC;
245 padd->config->outputFormat = FAAD_FMT_16BIT;
246 padd->config->downMatrix = 0;
247 NeAACDecSetConfiguration(padd->decoder, padd->config);
250 static void mp4dec_close(struct filter_node *fn)
252 struct private_mp4dec_data *padd = fn->private_data;
254 NeAACDecClose(padd->decoder);
258 fn->private_data = NULL;
262 * the init function of the mp3dec filter
266 void aacdec_init(struct filter *f)
268 f->open = mp4dec_open;
270 f->close = mp4dec_close;