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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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✗✓ |
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if (get_bits_left(gb) < 112) |
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return AVERROR_INVALIDDATA; |
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✗✓ |
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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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✗✓ |
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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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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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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[8] = { |
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0, 1, 2, 3, 4, 5, 6, 8 |
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}; |
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static inline int get_object_type(GetBitContext *gb) |
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{ |
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int object_type = get_bits(gb, 5); |
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✓✓ |
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if (object_type == AOT_ESCAPE) |
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object_type = 32 + get_bits(gb, 6); |
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return object_type; |
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} |
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static inline int get_sample_rate(GetBitContext *gb, int *index) |
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{ |
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*index = get_bits(gb, 4); |
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✓✓ |
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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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int start_bit_index = get_bits_count(gb); |
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c->object_type = get_object_type(gb); |
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c->sample_rate = get_sample_rate(gb, &c->sampling_index); |
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c->chan_config = get_bits(gb, 4); |
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✓✗ |
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if (c->chan_config < FF_ARRAY_ELEMS(ff_mpeg4audio_channels)) |
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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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c->sbr = -1; |
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c->ps = -1; |
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✓✓✓✓
|
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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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✓✗✓✗
|
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!(show_bits(gb, 3) & 0x03 && !(show_bits(gb, 9) & 0x3F)))) { |
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✓✓ |
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if (c->object_type == AOT_PS) |
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c->ps = 1; |
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c->ext_object_type = AOT_SBR; |
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c->sbr = 1; |
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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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✗✓ |
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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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c->ext_object_type = AOT_NULL; |
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c->ext_sample_rate = 0; |
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} |
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specific_config_bitindex = get_bits_count(gb); |
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✓✓ |
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if (c->object_type == AOT_ALS) { |
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skip_bits(gb, 5); |
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✗✓ |
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if (show_bits_long(gb, 24) != MKBETAG('\0','A','L','S')) |
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skip_bits_long(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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✗✓ |
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if (ret < 0) |
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return ret; |
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} |
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✓✓✓✓
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if (c->ext_object_type != AOT_SBR && sync_extension) { |
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✓✓ |
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while (get_bits_left(gb) > 15) { |
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✓✓ |
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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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✓✓✓✓
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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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✓✓ |
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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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✓✓✓✓
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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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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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✓✓ |
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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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✓✓✓✓
✓✓ |
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if ((c->ps == -1 && c->object_type != AOT_AAC_LC) || c->channels & ~0x01) |
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c->ps = 0; |
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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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✓✓ |
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if (size <= 0) |
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return AVERROR_INVALIDDATA; |
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ret = init_get_bits8(&gb, buf, size); |
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✗✓ |
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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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} |