adts_parser.c

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/*
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
 
#include "config.h"
 
#include <stddef.h>
#include <stdint.h>
 
#include "adts_header.h"
#include "adts_parser.h"
 
int av_adts_header_parse(const uint8_t *buf, uint32_t *samples, uint8_t *frames)
{
#if CONFIG_ADTS_HEADER
    uint8_t tmpbuf[AV_AAC_ADTS_HEADER_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
    GetBitContext gb;
    AACADTSHeaderInfo hdr;
    int err;
    if (!buf)
        return AVERROR(EINVAL);
    memcpy(tmpbuf, buf, AV_AAC_ADTS_HEADER_SIZE);
    err = init_get_bits8(&gb, tmpbuf, AV_AAC_ADTS_HEADER_SIZE);
    if (err < 0)
        return err;
    err = ff_adts_header_parse(&gb, &hdr);
    if (err < 0)
        return err;
    *samples = hdr.samples;
    *frames  = hdr.num_aac_frames;
    return 0;
#else
    return AVERROR(ENOSYS);
#endif
}
 
int avpriv_adts_header_parse(AACADTSHeaderInfo **phdr, const uint8_t *buf, size_t size)
{
#if CONFIG_ADTS_HEADER
    int ret = 0;
    int allocated = 0;
    GetBitContext gb;
 
    if (!phdr || !buf || size < AV_AAC_ADTS_HEADER_SIZE)
        return AVERROR_INVALIDDATA;
 
    if (!*phdr) {
        allocated = 1;
        *phdr = av_mallocz(sizeof(AACADTSHeaderInfo));
    }
    if (!*phdr)
        return AVERROR(ENOMEM);
 
    ret = init_get_bits8(&gb, buf, AV_AAC_ADTS_HEADER_SIZE);
    if (ret < 0) {
        if (allocated)
            av_freep(phdr);
        return ret;
    }
 
    ret = ff_adts_header_parse(&gb, *phdr);
    if (ret < 0) {
        if (allocated)
            av_freep(phdr);
        return ret;
    }
 
    return 0;
#else
    return AVERROR(ENOSYS);
#endif
}