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https://github.com/FFmpeg/FFmpeg.git
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15b86f480a
* Multichannel support for TrueHD is experimental
There should be downmix substreams present for 2+ channel bitstreams,
but ffmpeg decoder doesn't need it. Will add support for this soon.
* There might be lossless check failures on LFE channels
* 32-bit sample support has been removed for now, will add it later
While testing, some samples gave lossless check failures when enforcing
s32. Probably this will also get solved with the LFE issues.
Signed-off-by: Jai Luthra <me@jailuthra.in>
137 lines
4.4 KiB
C
137 lines
4.4 KiB
C
/*
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* MLP codec common code
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* Copyright (c) 2007-2008 Ian Caulfield
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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 <stdint.h>
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#include "libavutil/crc.h"
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#include "libavutil/intreadwrite.h"
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#include "mlp.h"
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const uint8_t ff_mlp_huffman_tables[3][18][2] = {
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{ /* Huffman table 0, -7 - +10 */
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{0x01, 9}, {0x01, 8}, {0x01, 7}, {0x01, 6}, {0x01, 5}, {0x01, 4}, {0x01, 3},
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{0x04, 3}, {0x05, 3}, {0x06, 3}, {0x07, 3},
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{0x03, 3}, {0x05, 4}, {0x09, 5}, {0x11, 6}, {0x21, 7}, {0x41, 8}, {0x81, 9},
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}, { /* Huffman table 1, -7 - +8 */
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{0x01, 9}, {0x01, 8}, {0x01, 7}, {0x01, 6}, {0x01, 5}, {0x01, 4}, {0x01, 3},
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{0x02, 2}, {0x03, 2},
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{0x03, 3}, {0x05, 4}, {0x09, 5}, {0x11, 6}, {0x21, 7}, {0x41, 8}, {0x81, 9},
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}, { /* Huffman table 2, -7 - +7 */
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{0x01, 9}, {0x01, 8}, {0x01, 7}, {0x01, 6}, {0x01, 5}, {0x01, 4}, {0x01, 3},
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{0x01, 1},
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{0x03, 3}, {0x05, 4}, {0x09, 5}, {0x11, 6}, {0x21, 7}, {0x41, 8}, {0x81, 9},
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}
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};
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const ChannelInformation ff_mlp_ch_info[21] = {
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{ 0x01, 0x01, 0x00, 0x1f }, { 0x03, 0x02, 0x00, 0x1b },
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{ 0x07, 0x02, 0x01, 0x1f }, { 0x0F, 0x02, 0x02, 0x19 },
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{ 0x07, 0x02, 0x01, 0x03 }, { 0x0F, 0x02, 0x02, 0x1f },
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{ 0x1F, 0x02, 0x03, 0x01 }, { 0x07, 0x02, 0x01, 0x1a },
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{ 0x0F, 0x02, 0x02, 0x1f }, { 0x1F, 0x02, 0x03, 0x18 },
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{ 0x0F, 0x02, 0x02, 0x02 }, { 0x1F, 0x02, 0x03, 0x1f },
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{ 0x3F, 0x02, 0x04, 0x00 }, { 0x0F, 0x03, 0x01, 0x1f },
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{ 0x1F, 0x03, 0x02, 0x18 }, { 0x0F, 0x03, 0x01, 0x02 },
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{ 0x1F, 0x03, 0x02, 0x1f }, { 0x3F, 0x03, 0x03, 0x00 },
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{ 0x1F, 0x04, 0x01, 0x01 }, { 0x1F, 0x04, 0x01, 0x18 },
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{ 0x3F, 0x04, 0x02, 0x00 },
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};
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const uint64_t ff_mlp_channel_layouts[12] = {
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AV_CH_LAYOUT_MONO, AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_2_1,
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AV_CH_LAYOUT_QUAD, AV_CH_LAYOUT_2POINT1, AV_CH_LAYOUT_SURROUND,
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AV_CH_LAYOUT_4POINT0, AV_CH_LAYOUT_5POINT0_BACK, AV_CH_LAYOUT_3POINT1,
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AV_CH_LAYOUT_4POINT1, AV_CH_LAYOUT_5POINT1_BACK, 0,
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};
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static int crc_init = 0;
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#if CONFIG_SMALL
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#define CRC_TABLE_SIZE 257
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#else
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#define CRC_TABLE_SIZE 1024
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#endif
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static AVCRC crc_63[CRC_TABLE_SIZE];
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static AVCRC crc_1D[CRC_TABLE_SIZE];
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static AVCRC crc_2D[CRC_TABLE_SIZE];
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av_cold void ff_mlp_init_crc(void)
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{
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if (!crc_init) {
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av_crc_init(crc_63, 0, 8, 0x63, sizeof(crc_63));
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av_crc_init(crc_1D, 0, 8, 0x1D, sizeof(crc_1D));
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av_crc_init(crc_2D, 0, 16, 0x002D, sizeof(crc_2D));
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crc_init = 1;
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}
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}
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uint16_t ff_mlp_checksum16(const uint8_t *buf, unsigned int buf_size)
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{
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uint16_t crc;
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crc = av_crc(crc_2D, 0, buf, buf_size - 2);
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crc ^= AV_RL16(buf + buf_size - 2);
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return crc;
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}
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uint8_t ff_mlp_checksum8(const uint8_t *buf, unsigned int buf_size)
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{
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uint8_t checksum = av_crc(crc_63, 0x3c, buf, buf_size - 1); // crc_63[0xa2] == 0x3c
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checksum ^= buf[buf_size-1];
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return checksum;
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}
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uint8_t ff_mlp_restart_checksum(const uint8_t *buf, unsigned int bit_size)
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{
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int i;
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int num_bytes = (bit_size + 2) / 8;
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int crc = crc_1D[buf[0] & 0x3f];
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crc = av_crc(crc_1D, crc, buf + 1, num_bytes - 2);
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crc ^= buf[num_bytes - 1];
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for (i = 0; i < ((bit_size + 2) & 7); i++) {
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crc <<= 1;
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if (crc & 0x100)
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crc ^= 0x11D;
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crc ^= (buf[num_bytes] >> (7 - i)) & 1;
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}
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return crc;
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}
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uint8_t ff_mlp_calculate_parity(const uint8_t *buf, unsigned int buf_size)
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{
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uint32_t scratch = 0;
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const uint8_t *buf_end = buf + buf_size;
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for (; ((intptr_t) buf & 3) && buf < buf_end; buf++)
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scratch ^= *buf;
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for (; buf < buf_end - 3; buf += 4)
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scratch ^= *((const uint32_t*)buf);
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scratch = xor_32_to_8(scratch);
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for (; buf < buf_end; buf++)
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scratch ^= *buf;
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return scratch;
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}
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