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. */
18 #include "buffer_tree.h"
24 /** Give up decoding after that many errors. */
28 * data specific to the aacdec filter
30 * \sa filter, filter_node
32 struct private_aacdec_data {
33 /** the return value of aac_open */
34 NeAACDecHandle handle;
35 /** info about the currently decoded frame */
36 NeAACDecFrameInfo frame_info;
37 /** whether this instance of the aac decoder is already initialized */
40 * return value of aac_find_esds(). Used to call the right aacdec
43 unsigned long decoder_length;
44 /** number of times the decoder returned an error */
46 /** number of bytes already consumed from the imput stream */
47 size_t consumed_total;
48 /** return value of aac_find_entry_point */
50 /** The number of channels of the current stream. */
51 unsigned int channels;
52 /** Current sample rate in Hz. */
53 unsigned int sample_rate;
56 static int aacdec_execute(struct btr_node *btrn, const char *cmd, char **result)
58 struct filter_node *fn = btr_context(btrn);
59 struct private_aacdec_data *padd = fn->private_data;
61 return decoder_execute(cmd, padd->sample_rate, padd->channels, result);
64 static void aacdec_open(struct filter_node *fn)
66 struct private_aacdec_data *padd = para_calloc(sizeof(*padd));
68 fn->private_data = padd;
70 padd->handle = aac_open();
73 static void aacdec_close(struct filter_node *fn)
75 struct private_aacdec_data *padd = fn->private_data;
77 NeAACDecClose(padd->handle);
79 fn->private_data = NULL;
82 static int aacdec_post_select(__a_unused struct sched *s, void *context)
84 struct filter_node *fn = context;
85 struct btr_node *btrn = fn->btrn;
86 struct private_aacdec_data *padd = fn->private_data;
88 char *p, *inbuf, *outbuffer;
90 size_t len, skip, consumed, loaded;
93 ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
98 btr_merge(btrn, fn->min_iqs);
99 len = btr_next_buffer(btrn, &inbuf);
100 len = PARA_MIN(len, (size_t)8192);
102 if (!padd->initialized) {
103 unsigned long rate = 0;
104 unsigned char channels = 0;
105 ret = aac_find_esds(inbuf, len, &skip, &padd->decoder_length);
107 PARA_INFO_LOG("%s\n", para_strerror(-ret));
108 ret = NeAACDecInit(padd->handle, (unsigned char *)inbuf,
109 len, &rate, &channels);
110 PARA_INFO_LOG("decoder init: %d\n", ret);
112 ret = -E_AACDEC_INIT;
117 PARA_INFO_LOG("decoder len: %lu\n",
118 padd->decoder_length);
120 p = inbuf + consumed;
121 ret = -E_AACDEC_INIT;
122 if (NeAACDecInit2(padd->handle, (unsigned char *)p,
123 padd->decoder_length, &rate,
127 padd->sample_rate = rate;
128 padd->channels = channels;
129 PARA_INFO_LOG("rate: %u, channels: %u\n",
130 padd->sample_rate, padd->channels);
131 padd->initialized = 1;
133 if (padd->decoder_length > 0) {
136 ret = aac_find_entry_point(inbuf + consumed,
137 len - consumed, &skip);
144 PARA_INFO_LOG("entry: %zu\n", padd->entry);
147 if (padd->consumed_total + len < padd->entry)
149 if (padd->consumed_total < padd->entry)
150 consumed = padd->entry - padd->consumed_total;
152 for (; consumed < len; consumed++)
153 if ((inbuf[consumed] & 0xfe) == 0x20)
157 p = inbuf + consumed;
158 //PARA_CRIT_LOG("consumed: %zu (%zu + %zu), have: %zu\n", padd->consumed_total + consumed,
159 // padd->consumed_total, consumed, len - consumed);
160 outbuffer = NeAACDecDecode(padd->handle, &padd->frame_info,
161 (unsigned char *)p, len - consumed);
162 if (padd->frame_info.error) {
163 int err = padd->frame_info.error;
165 if (padd->error_count++ > MAX_ERRORS)
167 /* Suppress non-fatal bitstream error message at BOF/EOF */
168 if (len < fn->min_iqs || padd->consumed_total == 0) {
172 PARA_ERROR_LOG("%s\n", NeAACDecGetErrorMessage(err));
173 PARA_ERROR_LOG("consumed: %zu + %zu + %lu\n",
174 padd->consumed_total, consumed,
175 padd->frame_info.bytesconsumed);
177 consumed++; /* catch 21 */
180 padd->error_count = 0;
181 //PARA_CRIT_LOG("decoder ate %lu\n", padd->frame_info.bytesconsumed);
182 consumed += padd->frame_info.bytesconsumed;
184 if (!padd->frame_info.samples)
186 btr_buf = para_malloc(2 * padd->frame_info.samples);
188 for (i = 0; i < padd->frame_info.samples; i++) {
189 short sh = ((short *)outbuffer)[i];
190 write_int16_host_endian(btr_buf + loaded, sh);
193 btr_add_output(btr_buf, loaded, btrn);
198 padd->consumed_total += ret;
199 btr_consume(btrn, ret);
204 btr_remove_node(&fn->btrn);
208 const struct filter lsg_filter_cmd_com_aacdec_user_data = {
210 .close = aacdec_close,
211 .pre_select = generic_filter_pre_select,
212 .post_select = aacdec_post_select,
213 .execute = aacdec_execute