mlp: Split common code from parser and decoder to be used by encoder.
Originally committed as revision 14733 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ramiro Polla
parent
e7327dbba7
commit
ce15710f55
@ -109,7 +109,7 @@ OBJS-$(CONFIG_MIMIC_DECODER) += mimic.o
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OBJS-$(CONFIG_MJPEG_DECODER) += mjpegdec.o mjpeg.o
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OBJS-$(CONFIG_MJPEG_ENCODER) += mjpegenc.o mjpeg.o mpegvideo_enc.o motion_est.o ratecontrol.o mpeg12data.o mpegvideo.o
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OBJS-$(CONFIG_MJPEGB_DECODER) += mjpegbdec.o mjpegdec.o mjpeg.o
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OBJS-$(CONFIG_MLP_DECODER) += mlpdec.o
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OBJS-$(CONFIG_MLP_DECODER) += mlp.o mlpdec.o
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OBJS-$(CONFIG_MMVIDEO_DECODER) += mmvideo.o
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OBJS-$(CONFIG_MOTIONPIXELS_DECODER) += motionpixels.o
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OBJS-$(CONFIG_MP2_DECODER) += mpegaudiodec.o mpegaudiodecheader.o mpegaudio.o mpegaudiodata.o
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@ -348,7 +348,7 @@ OBJS-$(CONFIG_H261_PARSER) += h261_parser.o
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OBJS-$(CONFIG_H263_PARSER) += h263_parser.o
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OBJS-$(CONFIG_H264_PARSER) += h264_parser.o
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OBJS-$(CONFIG_MJPEG_PARSER) += mjpeg_parser.o
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OBJS-$(CONFIG_MLP_PARSER) += mlp_parser.o
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OBJS-$(CONFIG_MLP_PARSER) += mlp.o mlp_parser.o
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OBJS-$(CONFIG_MPEG4VIDEO_PARSER) += mpeg4video_parser.o h263.o mpeg12data.o mpegvideo.o error_resilience.o
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OBJS-$(CONFIG_MPEGAUDIO_PARSER) += mpegaudio_parser.o mpegaudiodecheader.o mpegaudiodata.o
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OBJS-$(CONFIG_MPEGVIDEO_PARSER) += mpegvideo_parser.o mpeg12.o mpeg12data.o mpegvideo.o error_resilience.o
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120
libavcodec/mlp.c
Normal file
120
libavcodec/mlp.c
Normal file
@ -0,0 +1,120 @@
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/*
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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 "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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static int crc_init = 0;
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static AVCRC crc_63[1024];
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static AVCRC crc_1D[1024];
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static int crc_init_2D = 0;
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static AVCRC crc_2D[1024];
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int av_cold ff_mlp_init_crc2D(AVCodecParserContext *s)
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{
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if (!crc_init_2D) {
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av_crc_init(crc_2D, 0, 16, 0x002D, sizeof(crc_2D));
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crc_init_2D = 1;
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}
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return 0;
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}
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void av_cold ff_mlp_init_crc()
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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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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 (; buf < buf_end - 3; buf += 4)
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scratch ^= *((const uint32_t*)buf);
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scratch ^= scratch >> 16;
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scratch ^= scratch >> 8;
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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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109
libavcodec/mlp.h
Normal file
109
libavcodec/mlp.h
Normal file
@ -0,0 +1,109 @@
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/*
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* MLP codec common header file
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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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#ifndef FFMPEG_MLP_H
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#define FFMPEG_MLP_H
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#include <stdint.h>
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#include "avcodec.h"
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/** Maximum number of channels that can be decoded. */
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#define MAX_CHANNELS 16
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/** Maximum number of matrices used in decoding; most streams have one matrix
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* per output channel, but some rematrix a channel (usually 0) more than once.
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*/
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#define MAX_MATRICES 15
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/** Maximum number of substreams that can be decoded. This could also be set
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* higher, but I haven't seen any examples with more than two. */
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#define MAX_SUBSTREAMS 2
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/** maximum sample frequency seen in files */
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#define MAX_SAMPLERATE 192000
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/** maximum number of audio samples within one access unit */
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#define MAX_BLOCKSIZE (40 * (MAX_SAMPLERATE / 48000))
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/** next power of two greater than MAX_BLOCKSIZE */
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#define MAX_BLOCKSIZE_POW2 (64 * (MAX_SAMPLERATE / 48000))
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/** number of allowed filters */
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#define NUM_FILTERS 2
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/** The maximum number of taps in either the IIR or FIR filter;
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* I believe MLP actually specifies the maximum order for IIR filters as four,
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* and that the sum of the orders of both filters must be <= 8. */
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#define MAX_FILTER_ORDER 8
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#define FIR 0
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#define IIR 1
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/** filter data */
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typedef struct {
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uint8_t order; ///< number of taps in filter
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uint8_t shift; ///< Right shift to apply to output of filter.
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int32_t coeff[MAX_FILTER_ORDER];
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int32_t state[MAX_FILTER_ORDER];
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} FilterParams;
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/** sample data coding information */
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typedef struct {
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FilterParams filter_params[NUM_FILTERS];
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int16_t huff_offset; ///< Offset to apply to residual values.
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int32_t sign_huff_offset; ///< sign/rounding-corrected version of huff_offset
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uint8_t codebook; ///< Which VLC codebook to use to read residuals.
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uint8_t huff_lsbs; ///< Size of residual suffix not encoded using VLC.
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} ChannelParams;
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/** Tables defining the Huffman codes.
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* There are three entropy coding methods used in MLP (four if you count
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* "none" as a method). These use the same sequences for codes starting with
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* 00 or 01, but have different codes starting with 1. */
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extern const uint8_t ff_mlp_huffman_tables[3][18][2];
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/** MLP uses checksums that seem to be based on the standard CRC algorithm, but
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* are not (in implementation terms, the table lookup and XOR are reversed).
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* We can implement this behavior using a standard av_crc on all but the
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* last element, then XOR that with the last element. */
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uint8_t ff_mlp_checksum8 (const uint8_t *buf, unsigned int buf_size);
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uint16_t ff_mlp_checksum16(const uint8_t *buf, unsigned int buf_size);
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/** Calculate an 8-bit checksum over a restart header -- a non-multiple-of-8
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* number of bits, starting two bits into the first byte of buf. */
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uint8_t ff_mlp_restart_checksum(const uint8_t *buf, unsigned int bit_size);
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/** XOR together all the bytes of a buffer.
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* Does this belong in dspcontext? */
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uint8_t ff_mlp_calculate_parity(const uint8_t *buf, unsigned int buf_size);
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int ff_mlp_init_crc2D(AVCodecParserContext *s);
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void ff_mlp_init_crc();
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#endif /* FFMPEG_MLP_H */
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@ -30,6 +30,7 @@
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#include "bitstream.h"
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#include "parser.h"
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#include "mlp_parser.h"
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#include "mlp.h"
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static const uint8_t mlp_quants[16] = {
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16, 20, 24, 0, 0, 0, 0, 0,
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@ -64,34 +65,6 @@ static int truehd_channels(int chanmap)
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return channels;
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}
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static int crc_init = 0;
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static AVCRC crc_2D[1024];
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/** MLP uses checksums that seem to be based on the standard CRC algorithm, but
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* are not (in implementation terms, the table lookup and XOR are reversed).
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* We can implement this behavior using a standard av_crc on all but the
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* last element, then XOR that with the last element.
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*/
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static uint16_t 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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static int av_cold mlp_parse_init(AVCodecParserContext *s)
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{
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if (!crc_init) {
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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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return 0;
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}
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/** Read a major sync info header - contains high level information about
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* the stream - sample rate, channel arrangement etc. Most of this
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* information is not actually necessary for decoding, only for playback.
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@ -110,7 +83,7 @@ int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb)
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return -1;
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}
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checksum = mlp_checksum16(gb->buffer, 26);
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checksum = ff_mlp_checksum16(gb->buffer, 26);
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if (checksum != AV_RL16(gb->buffer+26)) {
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av_log(log, AV_LOG_ERROR, "major sync info header checksum error\n");
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return -1;
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@ -310,7 +283,7 @@ lost_sync:
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AVCodecParser mlp_parser = {
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{ CODEC_ID_MLP },
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sizeof(MLPParseContext),
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mlp_parse_init,
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ff_mlp_init_crc2D,
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mlp_parse,
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NULL,
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};
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@ -32,35 +32,7 @@
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#include "libavutil/crc.h"
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#include "parser.h"
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#include "mlp_parser.h"
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/** Maximum number of channels that can be decoded. */
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#define MAX_CHANNELS 16
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/** Maximum number of matrices used in decoding; most streams have one matrix
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* per output channel, but some rematrix a channel (usually 0) more than once.
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*/
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#define MAX_MATRICES 15
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/** Maximum number of substreams that can be decoded. This could also be set
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* higher, but I haven't seen any examples with more than two. */
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#define MAX_SUBSTREAMS 2
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/** maximum sample frequency seen in files */
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#define MAX_SAMPLERATE 192000
|
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|
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/** maximum number of audio samples within one access unit */
|
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#define MAX_BLOCKSIZE (40 * (MAX_SAMPLERATE / 48000))
|
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/** next power of two greater than MAX_BLOCKSIZE */
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#define MAX_BLOCKSIZE_POW2 (64 * (MAX_SAMPLERATE / 48000))
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/** number of allowed filters */
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#define NUM_FILTERS 2
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/** The maximum number of taps in either the IIR or FIR filter;
|
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* I believe MLP actually specifies the maximum order for IIR filters as four,
|
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* and that the sum of the orders of both filters must be <= 8. */
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#define MAX_FILTER_ORDER 8
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#include "mlp.h"
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/** number of bits used for VLC lookup - longest Huffman code is 9 */
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#define VLC_BITS 9
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@ -139,28 +111,6 @@ typedef struct SubStream {
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} SubStream;
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#define FIR 0
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#define IIR 1
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/** filter data */
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typedef struct {
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uint8_t order; ///< number of taps in filter
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uint8_t shift; ///< Right shift to apply to output of filter.
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int32_t coeff[MAX_FILTER_ORDER];
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int32_t state[MAX_FILTER_ORDER];
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} FilterParams;
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/** sample data coding information */
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typedef struct {
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FilterParams filter_params[NUM_FILTERS];
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int16_t huff_offset; ///< Offset to apply to residual values.
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int32_t sign_huff_offset; ///< sign/rounding-corrected version of huff_offset
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uint8_t codebook; ///< Which VLC codebook to use to read residuals.
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uint8_t huff_lsbs; ///< Size of residual suffix not encoded using VLC.
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} ChannelParams;
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typedef struct MLPDecodeContext {
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AVCodecContext *avctx;
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@ -187,88 +137,23 @@ typedef struct MLPDecodeContext {
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int32_t sample_buffer[MAX_BLOCKSIZE][MAX_CHANNELS+2];
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} MLPDecodeContext;
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/** Tables defining the Huffman codes.
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* There are three entropy coding methods used in MLP (four if you count
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* "none" as a method). These use the same sequences for codes starting with
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* 00 or 01, but have different codes starting with 1. */
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static const uint8_t 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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static VLC huff_vlc[3];
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static int crc_init = 0;
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static AVCRC crc_63[1024];
|
||||
static AVCRC crc_1D[1024];
|
||||
|
||||
|
||||
/** Initialize static data, constant between all invocations of the codec. */
|
||||
|
||||
static av_cold void init_static()
|
||||
{
|
||||
INIT_VLC_STATIC(&huff_vlc[0], VLC_BITS, 18,
|
||||
&huffman_tables[0][0][1], 2, 1,
|
||||
&huffman_tables[0][0][0], 2, 1, 512);
|
||||
&ff_mlp_huffman_tables[0][0][1], 2, 1,
|
||||
&ff_mlp_huffman_tables[0][0][0], 2, 1, 512);
|
||||
INIT_VLC_STATIC(&huff_vlc[1], VLC_BITS, 16,
|
||||
&huffman_tables[1][0][1], 2, 1,
|
||||
&huffman_tables[1][0][0], 2, 1, 512);
|
||||
&ff_mlp_huffman_tables[1][0][1], 2, 1,
|
||||
&ff_mlp_huffman_tables[1][0][0], 2, 1, 512);
|
||||
INIT_VLC_STATIC(&huff_vlc[2], VLC_BITS, 15,
|
||||
&huffman_tables[2][0][1], 2, 1,
|
||||
&huffman_tables[2][0][0], 2, 1, 512);
|
||||
&ff_mlp_huffman_tables[2][0][1], 2, 1,
|
||||
&ff_mlp_huffman_tables[2][0][0], 2, 1, 512);
|
||||
|
||||
if (!crc_init) {
|
||||
av_crc_init(crc_63, 0, 8, 0x63, sizeof(crc_63));
|
||||
av_crc_init(crc_1D, 0, 8, 0x1D, sizeof(crc_1D));
|
||||
crc_init = 1;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/** MLP uses checksums that seem to be based on the standard CRC algorithm, but
|
||||
* are not (in implementation terms, the table lookup and XOR are reversed).
|
||||
* We can implement this behavior using a standard av_crc on all but the
|
||||
* last element, then XOR that with the last element. */
|
||||
|
||||
static uint8_t mlp_checksum8(const uint8_t *buf, unsigned int buf_size)
|
||||
{
|
||||
uint8_t checksum = av_crc(crc_63, 0x3c, buf, buf_size - 1); // crc_63[0xa2] == 0x3c
|
||||
checksum ^= buf[buf_size-1];
|
||||
return checksum;
|
||||
}
|
||||
|
||||
/** Calculate an 8-bit checksum over a restart header -- a non-multiple-of-8
|
||||
* number of bits, starting two bits into the first byte of buf. */
|
||||
|
||||
static uint8_t mlp_restart_checksum(const uint8_t *buf, unsigned int bit_size)
|
||||
{
|
||||
int i;
|
||||
int num_bytes = (bit_size + 2) / 8;
|
||||
|
||||
int crc = crc_1D[buf[0] & 0x3f];
|
||||
crc = av_crc(crc_1D, crc, buf + 1, num_bytes - 2);
|
||||
crc ^= buf[num_bytes - 1];
|
||||
|
||||
for (i = 0; i < ((bit_size + 2) & 7); i++) {
|
||||
crc <<= 1;
|
||||
if (crc & 0x100)
|
||||
crc ^= 0x11D;
|
||||
crc ^= (buf[num_bytes] >> (7 - i)) & 1;
|
||||
}
|
||||
|
||||
return crc;
|
||||
ff_mlp_init_crc();
|
||||
}
|
||||
|
||||
static inline int32_t calculate_sign_huff(MLPDecodeContext *m,
|
||||
@ -506,7 +391,7 @@ static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp,
|
||||
}
|
||||
}
|
||||
|
||||
checksum = mlp_restart_checksum(buf, get_bits_count(gbp) - start_count);
|
||||
checksum = ff_mlp_restart_checksum(buf, get_bits_count(gbp) - start_count);
|
||||
|
||||
if (checksum != get_bits(gbp, 8))
|
||||
av_log(m->avctx, AV_LOG_ERROR, "restart header checksum error\n");
|
||||
@ -975,26 +860,6 @@ static int output_data(MLPDecodeContext *m, unsigned int substr,
|
||||
}
|
||||
|
||||
|
||||
/** XOR together all the bytes of a buffer.
|
||||
* Does this belong in dspcontext? */
|
||||
|
||||
static uint8_t calculate_parity(const uint8_t *buf, unsigned int buf_size)
|
||||
{
|
||||
uint32_t scratch = 0;
|
||||
const uint8_t *buf_end = buf + buf_size;
|
||||
|
||||
for (; buf < buf_end - 3; buf += 4)
|
||||
scratch ^= *((const uint32_t*)buf);
|
||||
|
||||
scratch ^= scratch >> 16;
|
||||
scratch ^= scratch >> 8;
|
||||
|
||||
for (; buf < buf_end; buf++)
|
||||
scratch ^= *buf;
|
||||
|
||||
return scratch;
|
||||
}
|
||||
|
||||
/** Read an access unit from the stream.
|
||||
* Returns < 0 on error, 0 if not enough data is present in the input stream
|
||||
* otherwise returns the number of bytes consumed. */
|
||||
@ -1078,8 +943,8 @@ static int read_access_unit(AVCodecContext *avctx, void* data, int *data_size,
|
||||
substream_start = end;
|
||||
}
|
||||
|
||||
parity_bits = calculate_parity(buf, 4);
|
||||
parity_bits ^= calculate_parity(buf + header_size, substr_header_size);
|
||||
parity_bits = ff_mlp_calculate_parity(buf, 4);
|
||||
parity_bits ^= ff_mlp_calculate_parity(buf + header_size, substr_header_size);
|
||||
|
||||
if ((((parity_bits >> 4) ^ parity_bits) & 0xF) != 0xF) {
|
||||
av_log(avctx, AV_LOG_ERROR, "Parity check failed.\n");
|
||||
@ -1145,12 +1010,12 @@ static int read_access_unit(AVCodecContext *avctx, void* data, int *data_size,
|
||||
substream_parity_present[substr]) {
|
||||
uint8_t parity, checksum;
|
||||
|
||||
parity = calculate_parity(buf, substream_data_len[substr] - 2);
|
||||
parity = ff_mlp_calculate_parity(buf, substream_data_len[substr] - 2);
|
||||
if ((parity ^ get_bits(&gb, 8)) != 0xa9)
|
||||
av_log(m->avctx, AV_LOG_ERROR,
|
||||
"Substream %d parity check failed.\n", substr);
|
||||
|
||||
checksum = mlp_checksum8(buf, substream_data_len[substr] - 2);
|
||||
checksum = ff_mlp_checksum8(buf, substream_data_len[substr] - 2);
|
||||
if (checksum != get_bits(&gb, 8))
|
||||
av_log(m->avctx, AV_LOG_ERROR, "Substream %d checksum failed.\n",
|
||||
substr);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user