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. */
20 #include "buffer_tree.h"
26 /** the output buffer size */
27 #define AAC_OUTBUF_SIZE (32 * 1024)
29 /** give up decoding after that many errors */
33 * data specific to the aacdec filter
35 * \sa filter, filter_node
37 struct private_aacdec_data {
38 /** the return value of aac_open */
39 NeAACDecHandle handle;
40 /** info about the currently decoded frame */
41 NeAACDecFrameInfo frame_info;
42 /** whether this instance of the aac decoder is already initialized */
45 * return value of aac_find_esds(). Used to call the right aacdec
48 unsigned long decoder_length;
49 /** number of times the decoder returned an error */
51 /** number of bytes already consumed from the imput stream */
52 size_t consumed_total;
53 /** return value of aac_find_entry_point */
55 /** The number of channels of the current stream. */
56 unsigned int channels;
57 /** Current sample rate in Hz. */
58 unsigned int samplerate;
61 static ssize_t aacdec(char *input_buffer, size_t len, struct filter_node *fn)
63 struct private_aacdec_data *padd = fn->private_data;
64 struct filter_chain *fc = fn->fc;
66 unsigned char *p, *outbuffer;
67 unsigned char *inbuf = (unsigned char*)input_buffer;
68 size_t skip, consumed = 0;
70 if (fn->loaded > fn->bufsize * 3 / 5)
72 ret = *fc->input_error;
78 if (!padd->initialized) {
79 unsigned long rate = 0;
80 unsigned char channels = 0;
81 ret = aac_find_esds(inbuf, len, &skip, &padd->decoder_length);
83 PARA_INFO_LOG("%s\n", para_strerror(-ret));
84 ret = NeAACDecInit(padd->handle, inbuf,
85 len, &rate, &channels);
86 PARA_INFO_LOG("decoder init: %d\n", ret);
93 PARA_INFO_LOG("decoder len: %lu\n",
94 padd->decoder_length);
98 if (NeAACDecInit2(padd->handle, p,
99 padd->decoder_length, &rate,
103 fc->samplerate = rate;
104 fc->channels = channels;
105 PARA_INFO_LOG("rate: %u, channels: %d\n",
106 fc->samplerate, fc->channels);
107 padd->initialized = 1;
109 if (padd->decoder_length > 0) {
112 ret = aac_find_entry_point(inbuf + consumed,
113 len - consumed, &skip);
120 PARA_INFO_LOG("entry: %zu\n", padd->entry);
123 if (padd->consumed_total + len < padd->entry)
125 if (padd->consumed_total < padd->entry)
126 consumed = padd->entry - padd->consumed_total;
128 for (; consumed < len; consumed++)
129 if ((inbuf[consumed] & 0xfe) == 0x20)
133 p = inbuf + consumed;
134 outbuffer = NeAACDecDecode(padd->handle, &padd->frame_info, p,
136 if (padd->frame_info.error) {
138 if (padd->error_count++ > MAX_ERRORS)
140 PARA_ERROR_LOG("frame_error: %d, consumed: %zu + %zd + %lu\n",
141 padd->frame_info.error, padd->consumed_total,
142 consumed, padd->frame_info.bytesconsumed);
143 PARA_ERROR_LOG("%s\n", NeAACDecGetErrorMessage(
144 padd->frame_info.error));
145 consumed++; /* catch 21 */
148 padd->error_count = 0;
149 consumed += padd->frame_info.bytesconsumed;
151 if (!padd->frame_info.samples)
153 ret = -E_AAC_OVERRUN;
154 if (padd->frame_info.samples * 2 + fn->loaded > fn->bufsize)
156 for (i = 0; i < padd->frame_info.samples; i++) {
157 short *s = (short *)outbuffer;
158 write_int16_host_endian(fn->buf + fn->loaded, s[i]);
165 padd->consumed_total += ret;
169 static int aacdec_execute(struct btr_node *btrn, const char *cmd, char **result)
171 struct filter_node *fn = btr_context(btrn);
172 struct private_aacdec_data *padd = fn->private_data;
174 if (!strcmp(cmd, "samplerate")) {
175 if (padd->samplerate == 0)
176 return -ERRNO_TO_PARA_ERROR(ENAVAIL);
177 *result = make_message("%u", padd->samplerate);
180 if (!strcmp(cmd, "channels")) {
181 if (padd->channels == 0)
182 return -ERRNO_TO_PARA_ERROR(ENAVAIL);
183 *result = make_message("%u", padd->channels);
186 return -ERRNO_TO_PARA_ERROR(ENOTSUP);
189 static void aacdec_open(struct filter_node *fn)
191 struct private_aacdec_data *padd = para_calloc(sizeof(*padd));
193 fn->private_data = padd;
194 fn->bufsize = AAC_OUTBUF_SIZE;
195 fn->buf = para_calloc(fn->bufsize);
197 padd->handle = aac_open();
200 static void aacdec_close(struct filter_node *fn)
202 struct private_aacdec_data *padd = fn->private_data;
204 NeAACDecClose(padd->handle);
208 fn->private_data = NULL;
211 static void aacdec_post_select(__a_unused struct sched *s, struct task *t)
213 struct filter_node *fn = container_of(t, struct filter_node, task);
214 struct btr_node *btrn = fn->btrn;
215 struct private_aacdec_data *padd = fn->private_data;
217 unsigned char *p, *inbuf, *outbuffer;
219 size_t len, skip, consumed, loaded, iqs;
223 ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
228 btr_merge(btrn, fn->min_iqs);
229 len = btr_next_buffer(btrn, (char **)&inbuf);
231 iqs = btr_get_input_queue_size(btrn);
232 if (!padd->initialized) {
233 unsigned long rate = 0;
234 unsigned char channels = 0;
235 ret = aac_find_esds(inbuf, len, &skip, &padd->decoder_length);
237 PARA_INFO_LOG("%s\n", para_strerror(-ret));
238 ret = NeAACDecInit(padd->handle, inbuf,
239 len, &rate, &channels);
240 PARA_INFO_LOG("decoder init: %d\n", ret);
242 ret = -E_AACDEC_INIT;
247 PARA_INFO_LOG("decoder len: %lu\n",
248 padd->decoder_length);
250 p = inbuf + consumed;
251 ret = -E_AACDEC_INIT;
252 if (NeAACDecInit2(padd->handle, p,
253 padd->decoder_length, &rate,
257 padd->samplerate = rate;
258 padd->channels = channels;
259 PARA_INFO_LOG("rate: %u, channels: %d\n",
260 padd->samplerate, padd->channels);
261 padd->initialized = 1;
263 if (padd->decoder_length > 0) {
266 ret = aac_find_entry_point(inbuf + consumed,
267 len - consumed, &skip);
274 PARA_INFO_LOG("entry: %zu\n", padd->entry);
277 if (padd->consumed_total + len < padd->entry)
279 if (padd->consumed_total < padd->entry)
280 consumed = padd->entry - padd->consumed_total;
282 for (; consumed < len; consumed++)
283 if ((inbuf[consumed] & 0xfe) == 0x20)
287 p = inbuf + consumed;
288 //PARA_CRIT_LOG("consumed: %zu (%zu + %zu), have: %zu\n", padd->consumed_total + consumed,
289 // padd->consumed_total, consumed, len - consumed);
290 outbuffer = NeAACDecDecode(padd->handle, &padd->frame_info, p,
292 if (padd->frame_info.error) {
293 int err = padd->frame_info.error;
295 if (padd->error_count++ > MAX_ERRORS)
297 PARA_ERROR_LOG("frame_error: %d (%s), consumed: %zu + %zd + %lu\n",
298 err, NeAACDecGetErrorMessage(padd->frame_info.error),
299 padd->consumed_total, consumed,
300 padd->frame_info.bytesconsumed);
301 PARA_ERROR_LOG("%s\n", NeAACDecGetErrorMessage(
302 padd->frame_info.error));
303 consumed++; /* catch 21 */
306 padd->error_count = 0;
307 //PARA_CRIT_LOG("decoder ate %lu\n", padd->frame_info.bytesconsumed);
308 consumed += padd->frame_info.bytesconsumed;
310 if (!padd->frame_info.samples)
312 btr_buf = para_malloc(2 * padd->frame_info.samples);
314 for (i = 0; i < padd->frame_info.samples; i++) {
315 short sh = ((short *)outbuffer)[i];
316 write_int16_host_endian(btr_buf + loaded, sh);
319 btr_add_output(btr_buf, loaded, btrn);
324 padd->consumed_total += ret;
325 btr_consume(btrn, ret);
331 btr_remove_node(btrn);
335 * the init function of the aacdec filter
337 * \param f pointer to the filter struct to initialize
341 void aacdec_filter_init(struct filter *f)
343 f->open = aacdec_open;
345 f->close = aacdec_close;
346 f->pre_select = generic_filter_pre_select;
347 f->post_select = aacdec_post_select;
348 f->execute = aacdec_execute;