GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/mpeg4audio.c Lines: 69 86 80.2 %
Date: 2020-09-25 23:16:12 Branches: 50 64 78.1 %

Line Branch Exec Source
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/*
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 * MPEG-4 Audio common code
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 * Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@free.fr>
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 * Copyright (c) 2009 Alex Converse <alex.converse@gmail.com>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "get_bits.h"
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#include "put_bits.h"
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#include "mpeg4audio.h"
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/**
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 * Parse MPEG-4 audio configuration for ALS object type.
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 * @param[in] gb       bit reader context
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 * @param[in] c        MPEG4AudioConfig structure to fill
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 * @return on success 0 is returned, otherwise a value < 0
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 */
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static int parse_config_ALS(GetBitContext *gb, MPEG4AudioConfig *c)
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{
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21
    if (get_bits_left(gb) < 112)
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        return AVERROR_INVALIDDATA;
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21
    if (get_bits_long(gb, 32) != MKBETAG('A','L','S','\0'))
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        return AVERROR_INVALIDDATA;
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    // override AudioSpecificConfig channel configuration and sample rate
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    // which are buggy in old ALS conformance files
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    c->sample_rate = get_bits_long(gb, 32);
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    if (c->sample_rate <= 0) {
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        av_log(NULL, AV_LOG_ERROR, "Invalid sample rate %d\n", c->sample_rate);
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        return AVERROR_INVALIDDATA;
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    }
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    // skip number of samples
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21
    skip_bits_long(gb, 32);
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    // read number of channels
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    c->chan_config = 0;
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21
    c->channels    = get_bits(gb, 16) + 1;
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    return 0;
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}
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/* XXX: make sure to update the copies in the different encoders if you change
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 * this table */
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const int avpriv_mpeg4audio_sample_rates[16] = {
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    96000, 88200, 64000, 48000, 44100, 32000,
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    24000, 22050, 16000, 12000, 11025, 8000, 7350
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};
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const uint8_t ff_mpeg4audio_channels[14] = {
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    0,
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    1, // mono (1/0)
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    2, // stereo (2/0)
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    3, // 3/0
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    4, // 3/1
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    5, // 3/2
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    6, // 3/2.1
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    8, // 5/2.1
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    0,
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    0,
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    0,
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    7, // 3/3.1
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    8, // 3/2/2.1
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    24 // 3/3/3 - 5/2/3 - 3/0/0.2
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};
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827
static inline int get_object_type(GetBitContext *gb)
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{
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827
    int object_type = get_bits(gb, 5);
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827
    if (object_type == AOT_ESCAPE)
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36
        object_type = 32 + get_bits(gb, 6);
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827
    return object_type;
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}
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764
static inline int get_sample_rate(GetBitContext *gb, int *index)
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{
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764
    *index = get_bits(gb, 4);
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1507
    return *index == 0x0f ? get_bits(gb, 24) :
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        avpriv_mpeg4audio_sample_rates[*index];
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}
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int ff_mpeg4audio_get_config_gb(MPEG4AudioConfig *c, GetBitContext *gb,
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                                int sync_extension, void *logctx)
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{
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    int specific_config_bitindex, ret;
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680
    int start_bit_index = get_bits_count(gb);
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680
    c->object_type = get_object_type(gb);
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680
    c->sample_rate = get_sample_rate(gb, &c->sampling_index);
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680
    c->chan_config = get_bits(gb, 4);
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680
    if (c->chan_config < FF_ARRAY_ELEMS(ff_mpeg4audio_channels))
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680
        c->channels = ff_mpeg4audio_channels[c->chan_config];
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    else {
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        av_log(logctx, AV_LOG_ERROR, "Invalid chan_config %d\n", c->chan_config);
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        return AVERROR_INVALIDDATA;
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    }
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680
    c->sbr = -1;
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680
    c->ps  = -1;
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    if (c->object_type == AOT_SBR || (c->object_type == AOT_PS &&
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        // check for W6132 Annex YYYY draft MP3onMP4
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3
        !(show_bits(gb, 3) & 0x03 && !(show_bits(gb, 9) & 0x3F)))) {
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6
        if (c->object_type == AOT_PS)
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3
            c->ps = 1;
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        c->ext_object_type = AOT_SBR;
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6
        c->sbr = 1;
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6
        c->ext_sample_rate = get_sample_rate(gb, &c->ext_sampling_index);
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        c->object_type = get_object_type(gb);
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6
        if (c->object_type == AOT_ER_BSAC)
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            c->ext_chan_config = get_bits(gb, 4);
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    } else {
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674
        c->ext_object_type = AOT_NULL;
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        c->ext_sample_rate = 0;
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    }
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680
    specific_config_bitindex = get_bits_count(gb);
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680
    if (c->object_type == AOT_ALS) {
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        skip_bits(gb, 5);
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        if (show_bits(gb, 24) != MKBETAG('\0','A','L','S'))
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            skip_bits(gb, 24);
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        specific_config_bitindex = get_bits_count(gb);
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        ret = parse_config_ALS(gb, c);
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        if (ret < 0)
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            return ret;
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    }
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    if (c->ext_object_type != AOT_SBR && sync_extension) {
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14697
        while (get_bits_left(gb) > 15) {
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14485
            if (show_bits(gb, 11) == 0x2b7) { // sync extension
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                get_bits(gb, 11);
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                c->ext_object_type = get_object_type(gb);
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                if (c->ext_object_type == AOT_SBR && (c->sbr = get_bits1(gb)) == 1) {
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                    c->ext_sample_rate = get_sample_rate(gb, &c->ext_sampling_index);
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                    if (c->ext_sample_rate == c->sample_rate)
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                        c->sbr = -1;
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                }
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                if (get_bits_left(gb) > 11 && get_bits(gb, 11) == 0x548)
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                    c->ps = get_bits1(gb);
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                break;
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            } else
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14344
                get_bits1(gb); // skip 1 bit
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        }
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    }
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    //PS requires SBR
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680
    if (!c->sbr)
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        c->ps = 0;
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    //Limit implicit PS to the HE-AACv2 Profile
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680
    if ((c->ps == -1 && c->object_type != AOT_AAC_LC) || c->channels & ~0x01)
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510
        c->ps = 0;
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680
    return specific_config_bitindex - start_bit_index;
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}
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#if LIBAVCODEC_VERSION_MAJOR < 59
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int avpriv_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf,
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                                 int bit_size, int sync_extension)
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{
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    GetBitContext gb;
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    int ret;
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    if (bit_size <= 0)
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        return AVERROR_INVALIDDATA;
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    ret = init_get_bits(&gb, buf, bit_size);
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    if (ret < 0)
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        return ret;
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    return ff_mpeg4audio_get_config_gb(c, &gb, sync_extension, NULL);
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}
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#endif
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int avpriv_mpeg4audio_get_config2(MPEG4AudioConfig *c, const uint8_t *buf,
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                                  int size, int sync_extension, void *logctx)
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{
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    GetBitContext gb;
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    int ret;
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    if (size <= 0)
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1
        return AVERROR_INVALIDDATA;
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    ret = init_get_bits8(&gb, buf, size);
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    if (ret < 0)
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        return ret;
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    return ff_mpeg4audio_get_config_gb(c, &gb, sync_extension, logctx);
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}