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mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-07 11:13:41 +02:00
FFmpeg/libavcodec/dca.c
Andreas Rheinhardt 3afb41655e avcodec/dca: Unavpriv dca_sample_rates
Said table is 64 bytes long and exported so that it can be used both
in libavcodec and libavformat. This commit stops doing so and instead
duplicates it for shared builds, because the overhead of exporting the
symbol is bigger than 64 bytes. It consists of the length of the name of
the symbol (2x24 bytes), two entries in .dynsym (2x24 bytes), two
entries for symbol version (2x2 bytes), one hash value in the exporting
library (4 bytes) in addition to one entry in the importing library's
.got and .rela.dyn (8 + 24 bytes).
(The above numbers are for a Linux/GNU/Elf system; the numbers for other
platforms may be different.)

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-01-04 13:16:49 +01:00

158 lines
4.6 KiB
C

/*
* DCA compatible decoder data
* Copyright (C) 2004 Gildas Bazin
* Copyright (C) 2004 Benjamin Zores
* Copyright (C) 2006 Benjamin Larsson
* Copyright (C) 2007 Konstantin Shishkov
*
* 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 <stdint.h>
#include <string.h>
#include "libavutil/error.h"
#include "dca.h"
#include "dca_core.h"
#include "dca_syncwords.h"
#include "get_bits.h"
#include "put_bits.h"
const uint32_t ff_dca_sampling_freqs[16] = {
8000, 16000, 32000, 64000, 128000, 22050, 44100, 88200,
176400, 352800, 12000, 24000, 48000, 96000, 192000, 384000,
};
const uint8_t ff_dca_freq_ranges[16] = {
0, 1, 2, 3, 4, 1, 2, 3, 4, 4, 0, 1, 2, 3, 4, 4
};
const uint8_t ff_dca_bits_per_sample[8] = {
16, 16, 20, 20, 0, 24, 24, 0
};
int avpriv_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst,
int max_size)
{
uint32_t mrk;
int i, tmp;
PutBitContext pb;
if ((unsigned) src_size > (unsigned) max_size)
src_size = max_size;
mrk = AV_RB32(src);
switch (mrk) {
case DCA_SYNCWORD_CORE_BE:
case DCA_SYNCWORD_SUBSTREAM:
memcpy(dst, src, src_size);
return src_size;
case DCA_SYNCWORD_CORE_LE:
for (i = 0; i < (src_size + 1) >> 1; i++) {
AV_WB16(dst, AV_RL16(src));
src += 2;
dst += 2;
}
return src_size;
case DCA_SYNCWORD_CORE_14B_BE:
case DCA_SYNCWORD_CORE_14B_LE:
init_put_bits(&pb, dst, max_size);
for (i = 0; i < (src_size + 1) >> 1; i++, src += 2) {
tmp = ((mrk == DCA_SYNCWORD_CORE_14B_BE) ? AV_RB16(src) : AV_RL16(src)) & 0x3FFF;
put_bits(&pb, 14, tmp);
}
flush_put_bits(&pb);
return put_bytes_output(&pb);
default:
return AVERROR_INVALIDDATA;
}
}
int ff_dca_parse_core_frame_header(DCACoreFrameHeader *h, GetBitContext *gb)
{
if (get_bits_long(gb, 32) != DCA_SYNCWORD_CORE_BE)
return DCA_PARSE_ERROR_SYNC_WORD;
h->normal_frame = get_bits1(gb);
h->deficit_samples = get_bits(gb, 5) + 1;
if (h->deficit_samples != DCA_PCMBLOCK_SAMPLES)
return DCA_PARSE_ERROR_DEFICIT_SAMPLES;
h->crc_present = get_bits1(gb);
h->npcmblocks = get_bits(gb, 7) + 1;
if (h->npcmblocks & (DCA_SUBBAND_SAMPLES - 1))
return DCA_PARSE_ERROR_PCM_BLOCKS;
h->frame_size = get_bits(gb, 14) + 1;
if (h->frame_size < 96)
return DCA_PARSE_ERROR_FRAME_SIZE;
h->audio_mode = get_bits(gb, 6);
if (h->audio_mode >= DCA_AMODE_COUNT)
return DCA_PARSE_ERROR_AMODE;
h->sr_code = get_bits(gb, 4);
if (!ff_dca_sample_rates[h->sr_code])
return DCA_PARSE_ERROR_SAMPLE_RATE;
h->br_code = get_bits(gb, 5);
if (get_bits1(gb))
return DCA_PARSE_ERROR_RESERVED_BIT;
h->drc_present = get_bits1(gb);
h->ts_present = get_bits1(gb);
h->aux_present = get_bits1(gb);
h->hdcd_master = get_bits1(gb);
h->ext_audio_type = get_bits(gb, 3);
h->ext_audio_present = get_bits1(gb);
h->sync_ssf = get_bits1(gb);
h->lfe_present = get_bits(gb, 2);
if (h->lfe_present == DCA_LFE_FLAG_INVALID)
return DCA_PARSE_ERROR_LFE_FLAG;
h->predictor_history = get_bits1(gb);
if (h->crc_present)
skip_bits(gb, 16);
h->filter_perfect = get_bits1(gb);
h->encoder_rev = get_bits(gb, 4);
h->copy_hist = get_bits(gb, 2);
h->pcmr_code = get_bits(gb, 3);
if (!ff_dca_bits_per_sample[h->pcmr_code])
return DCA_PARSE_ERROR_PCM_RES;
h->sumdiff_front = get_bits1(gb);
h->sumdiff_surround = get_bits1(gb);
h->dn_code = get_bits(gb, 4);
return 0;
}
int avpriv_dca_parse_core_frame_header(DCACoreFrameHeader *h, const uint8_t *buf, int size)
{
GetBitContext gb;
int ret;
ret = init_get_bits8(&gb, buf, size);
if (ret < 0)
return ret;
if (ff_dca_parse_core_frame_header(h, &gb) < 0)
return AVERROR_INVALIDDATA;
return 0;
}