yading@10: /*
yading@10:  * Audio and Video frame extraction
yading@10:  * Copyright (c) 2003 Fabrice Bellard
yading@10:  * Copyright (c) 2003 Michael Niedermayer
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "parser.h"
yading@10: #include "aac_ac3_parser.h"
yading@10: #include "aacadtsdec.h"
yading@10: #include "get_bits.h"
yading@10: #include "mpeg4audio.h"
yading@10: 
yading@10: static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info,
yading@10:         int *need_next_header, int *new_frame_start)
yading@10: {
yading@10:     GetBitContext bits;
yading@10:     AACADTSHeaderInfo hdr;
yading@10:     int size;
yading@10:     union {
yading@10:         uint64_t u64;
yading@10:         uint8_t  u8[8];
yading@10:     } tmp;
yading@10: 
yading@10:     tmp.u64 = av_be2ne64(state);
yading@10:     init_get_bits(&bits, tmp.u8+8-AAC_ADTS_HEADER_SIZE, AAC_ADTS_HEADER_SIZE * 8);
yading@10: 
yading@10:     if ((size = avpriv_aac_parse_header(&bits, &hdr)) < 0)
yading@10:         return 0;
yading@10:     *need_next_header = 0;
yading@10:     *new_frame_start  = 1;
yading@10:     hdr_info->sample_rate = hdr.sample_rate;
yading@10:     hdr_info->channels    = ff_mpeg4audio_channels[hdr.chan_config];
yading@10:     hdr_info->samples     = hdr.samples;
yading@10:     hdr_info->bit_rate    = hdr.bit_rate;
yading@10:     return size;
yading@10: }
yading@10: 
yading@10: static av_cold int aac_parse_init(AVCodecParserContext *s1)
yading@10: {
yading@10:     AACAC3ParseContext *s = s1->priv_data;
yading@10:     s->header_size = AAC_ADTS_HEADER_SIZE;
yading@10:     s->sync = aac_sync;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: 
yading@10: AVCodecParser ff_aac_parser = {
yading@10:     .codec_ids      = { AV_CODEC_ID_AAC },
yading@10:     .priv_data_size = sizeof(AACAC3ParseContext),
yading@10:     .parser_init    = aac_parse_init,
yading@10:     .parser_parse   = ff_aac_ac3_parse,
yading@10:     .parser_close   = ff_parse_close,
yading@10: };