157 lines
5 KiB
C
157 lines
5 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Codec for aac files without container
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*
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* Written by Igor B. Poretsky
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "codeclib.h"
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#include "libfaad/common.h"
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#include "libfaad/structs.h"
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#include "libfaad/decoder.h"
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CODEC_HEADER
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/* The maximum buffer size handled by faad. 12 bytes are required by libfaad
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* as headroom (see libfaad/bits.c). FAAD_BYTE_BUFFER_SIZE bytes are buffered
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* for each frame. */
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#define FAAD_BYTE_BUFFER_SIZE (2048-12)
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static void update_playing_time(void)
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{
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ci->set_elapsed((unsigned long)((ci->id3->offset - ci->id3->first_frame_offset) * 8LL / ci->id3->bitrate));
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}
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/* this is the codec entry point */
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enum codec_status codec_main(enum codec_entry_call_reason reason)
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{
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if (reason == CODEC_LOAD) {
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/* Generic codec initialisation */
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ci->configure(DSP_SET_STEREO_MODE, STEREO_NONINTERLEAVED);
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ci->configure(DSP_SET_SAMPLE_DEPTH, 29);
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}
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return CODEC_OK;
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}
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/* this is called for each file to process */
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enum codec_status codec_run(void)
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{
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size_t n;
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int32_t bread;
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unsigned int frame_samples;
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uint32_t s = 0;
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unsigned char c = 0;
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long action = CODEC_ACTION_NULL;
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intptr_t param;
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unsigned char* buffer;
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NeAACDecFrameInfo frame_info;
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NeAACDecHandle decoder;
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NeAACDecConfigurationPtr conf;
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/* Clean and initialize decoder structures */
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if (codec_init()) {
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LOGF("FAAD: Codec init error\n");
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return CODEC_ERROR;
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}
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ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
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codec_set_replaygain(ci->id3);
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ci->seek_buffer(ci->id3->first_frame_offset);
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/* initialise the sound converter */
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decoder = NeAACDecOpen();
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if (!decoder) {
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LOGF("FAAD: Decode open error\n");
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return CODEC_ERROR;
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}
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conf = NeAACDecGetCurrentConfiguration(decoder);
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conf->outputFormat = FAAD_FMT_24BIT; /* irrelevant, we don't convert */
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NeAACDecSetConfiguration(decoder, conf);
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buffer=ci->request_buffer(&n, FAAD_BYTE_BUFFER_SIZE);
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bread = NeAACDecInit(decoder, buffer, n, &s, &c);
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if (bread < 0) {
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LOGF("FAAD: DecInit: %ld, %d\n", (long int)bread, decoder->object_type);
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return CODEC_ERROR;
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}
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ci->advance_buffer(bread);
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if (ci->id3->offset > ci->id3->first_frame_offset) {
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/* Resume the desired (byte) position. */
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ci->seek_buffer(ci->id3->offset);
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NeAACDecPostSeekReset(decoder, 0);
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update_playing_time();
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} else if (ci->id3->elapsed) {
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action = CODEC_ACTION_SEEK_TIME;
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param = ci->id3->elapsed;
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} else {
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ci->set_elapsed(0);
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ci->set_offset(ci->id3->first_frame_offset);
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}
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/* The main decoding loop */
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while (1) {
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if (action == CODEC_ACTION_NULL)
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action = ci->get_command(¶m);
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if (action == CODEC_ACTION_HALT)
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break;
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/* Deal with any pending seek requests */
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if (action == CODEC_ACTION_SEEK_TIME) {
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/* Seek to the desired time position. */
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ci->seek_buffer(ci->id3->first_frame_offset + (uint32_t)((uint64_t)param * ci->id3->bitrate / 8));
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ci->set_elapsed((unsigned long)param);
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NeAACDecPostSeekReset(decoder, 0);
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ci->seek_complete();
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}
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action = CODEC_ACTION_NULL;
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/* Request the required number of bytes from the input buffer */
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buffer=ci->request_buffer(&n, FAAD_BYTE_BUFFER_SIZE);
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if (n == 0) /* End of Stream */
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break;
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/* Decode one block - returned samples will be host-endian */
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if (NeAACDecDecode(decoder, &frame_info, buffer, n) == NULL || frame_info.error > 0) {
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LOGF("FAAD: decode error '%s'\n", NeAACDecGetErrorMessage(frame_info.error));
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return CODEC_ERROR;
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}
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/* Advance codec buffer (no need to call set_offset because of this) */
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ci->advance_buffer(frame_info.bytesconsumed);
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/* Output the audio */
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ci->yield();
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frame_samples = frame_info.samples >> 1;
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ci->pcmbuf_insert(&decoder->time_out[0][0], &decoder->time_out[1][0], frame_samples);
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/* Update the elapsed-time indicator */
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update_playing_time();
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}
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LOGF("AAC: Decoding complete\n");
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return CODEC_OK;
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}
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