chromium/third_party/ffmpeg/libavcodec/vorbis.c

/**
 * @file
 * Common code for Vorbis I encoder and decoder
 * @author Denes Balatoni  ( dbalatoni programozo hu )
 *
 * 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
 */

/**
 * @file
 * Common code for Vorbis I encoder and decoder
 * @author Denes Balatoni  ( dbalatoni programozo hu )
 */

#include "libavutil/common.h"
#include "libavutil/error.h"
#include "libavutil/log.h"
#include "libavutil/macros.h"

#include "vorbis.h"
#include "vorbis_data.h"


/* Helper functions */

// x^(1/n)
unsigned int ff_vorbis_nth_root(unsigned int x, unsigned int n)
{ … }

// Generate vlc codes from vorbis huffman code lengths

// the two bits[p] > 32 checks should be redundant, all calling code should
// already ensure that, but since it allows overwriting the stack it seems
// reasonable to check redundantly.
int ff_vorbis_len2vlc(uint8_t *bits, uint32_t *codes, unsigned num)
{ … }

int ff_vorbis_ready_floor1_list(void *logctx,
                                vorbis_floor1_entry *list, int values)
{ … }

static inline void render_line_unrolled(intptr_t x, int y, int x1,
                                        intptr_t sy, int ady, int adx,
                                        float *buf)
{ … }

static void render_line(int x0, int y0, int x1, int y1, float *buf)
{ … }

void ff_vorbis_floor1_render_list(vorbis_floor1_entry * list, int values,
                                  uint16_t *y_list, int *flag,
                                  int multiplier, float *out, int samples)
{ … }