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FFmpeg4/libavcodec/vorbisenc.c

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/*
* copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
*
* 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
* Native Vorbis encoder.
* @author Oded Shimon <ods15@ods15.dyndns.org>
*/
#include <float.h>
#include "libavutil/float_dsp.h"
#include "avcodec.h"
#include "internal.h"
#include "fft.h"
#include "mathops.h"
#include "vorbis.h"
#include "vorbis_enc_data.h"
#include "audio_frame_queue.h"
#include "libavfilter/bufferqueue.h"
#define BITSTREAM_WRITER_LE
#include "put_bits.h"
#undef NDEBUG
#include <assert.h>
typedef struct vorbis_enc_codebook {
int nentries;
uint8_t *lens;
uint32_t *codewords;
int ndimensions;
float min;
float delta;
int seq_p;
int lookup;
int *quantlist;
float *dimensions;
float *pow2;
} vorbis_enc_codebook;
typedef struct vorbis_enc_floor_class {
int dim;
int subclass;
int masterbook;
int *books;
} vorbis_enc_floor_class;
typedef struct vorbis_enc_floor {
int partitions;
int *partition_to_class;
int nclasses;
vorbis_enc_floor_class *classes;
int multiplier;
int rangebits;
int values;
vorbis_floor1_entry *list;
} vorbis_enc_floor;
typedef struct vorbis_enc_residue {
int type;
int begin;
int end;
int partition_size;
int classifications;
int classbook;
int8_t (*books)[8];
float (*maxes)[2];
} vorbis_enc_residue;
typedef struct vorbis_enc_mapping {
int submaps;
int *mux;
int *floor;
int *residue;
int coupling_steps;
int *magnitude;
int *angle;
} vorbis_enc_mapping;
typedef struct vorbis_enc_mode {
int blockflag;
int mapping;
} vorbis_enc_mode;
typedef struct vorbis_enc_context {
int channels;
int sample_rate;
int log2_blocksize[2];
FFTContext mdct[2];
const float *win[2];
int have_saved;
float *saved;
float *samples;
float *floor; // also used for tmp values for mdct
float *coeffs; // also used for residue after floor
float *scratch; // used for tmp values for psy model
float quality;
AudioFrameQueue afq;
struct FFBufQueue bufqueue;
int ncodebooks;
vorbis_enc_codebook *codebooks;
int nfloors;
vorbis_enc_floor *floors;
int nresidues;
vorbis_enc_residue *residues;
int nmappings;
vorbis_enc_mapping *mappings;
int nmodes;
vorbis_enc_mode *modes;
int64_t next_pts;
AVFloatDSPContext *fdsp;
} vorbis_enc_context;
#define MAX_CHANNELS 2
#define MAX_CODEBOOK_DIM 8
#define MAX_FLOOR_CLASS_DIM 4
#define NUM_FLOOR_PARTITIONS 8
#define MAX_FLOOR_VALUES (MAX_FLOOR_CLASS_DIM*NUM_FLOOR_PARTITIONS+2)
#define RESIDUE_SIZE 1600
#define RESIDUE_PART_SIZE 32
#define NUM_RESIDUE_PARTITIONS (RESIDUE_SIZE/RESIDUE_PART_SIZE)
static inline int put_codeword(PutBitContext *pb, vorbis_enc_codebook *cb,
int entry)
{
av_assert2(entry >= 0);
av_assert2(entry < cb->nentries);
av_assert2(cb->lens[entry]);
if (pb->size_in_bits - put_bits_count(pb) < cb->lens[entry])
return AVERROR(EINVAL);
put_bits(pb, cb->lens[entry], cb->codewords[entry]);
return 0;
}
static int cb_lookup_vals(int lookup, int dimensions, int entries)
{
if (lookup == 1)
return ff_vorbis_nth_root(entries, dimensions);
else if (lookup == 2)
return dimensions *entries;
return 0;
}
static int ready_codebook(vorbis_enc_codebook *cb)
{
int i;
ff_vorbis_len2vlc(cb->lens, cb->codewords, cb->nentries);
if (!cb->lookup) {
cb->pow2 = cb->dimensions = NULL;
} else {
int vals = cb_lookup_vals(cb->lookup, cb->ndimensions, cb->nentries);
cb->dimensions = av_malloc_array(cb->nentries, sizeof(float) * cb->ndimensions);
cb->pow2 = av_mallocz_array(cb->nentries, sizeof(float));
if (!cb->dimensions || !cb->pow2)
return AVERROR(ENOMEM);
for (i = 0; i < cb->nentries; i++) {
float last = 0;
int j;
int div = 1;
for (j = 0; j < cb->ndimensions; j++) {
int off;
if (cb->lookup == 1)
off = (i / div) % vals; // lookup type 1
else
off = i * cb->ndimensions + j; // lookup type 2
cb->dimensions[i * cb->ndimensions + j] = last + cb->min + cb->quantlist[off] * cb->delta;
if (cb->seq_p)
last = cb->dimensions[i * cb->ndimensions + j];
cb->pow2[i] += cb->dimensions[i * cb->ndimensions + j] * cb->dimensions[i * cb->ndimensions + j];
div *= vals;
}
cb->pow2[i] /= 2.0;
}
}
return 0;
}
static int ready_residue(vorbis_enc_residue *rc, vorbis_enc_context *venc)
{
int i;
av_assert0(rc->type == 2);
rc->maxes = av_mallocz_array(rc->classifications, sizeof(float[2]));
if (!rc->maxes)
return AVERROR(ENOMEM);
for (i = 0; i < rc->classifications; i++) {
int j;
vorbis_enc_codebook * cb;
for (j = 0; j < 8; j++)
if (rc->books[i][j] != -1)
break;
if (j == 8) // zero
continue;
cb = &venc->codebooks[rc->books[i][j]];
assert(cb->ndimensions >= 2);
assert(cb->lookup);
for (j = 0; j < cb->nentries; j++) {
float a;
if (!cb->lens[j])
continue;
a = fabs(cb->dimensions[j * cb->ndimensions]);
if (a > rc->maxes[i][0])
rc->maxes[i][0] = a;
a = fabs(cb->dimensions[j * cb->ndimensions + 1]);
if (a > rc->maxes[i][1])
rc->maxes[i][1] = a;
}
}
// small bias
for (i = 0; i < rc->classifications; i++) {
rc->maxes[i][0] += 0.8;
rc->maxes[i][1] += 0.8;
}
return 0;
}
static av_cold int dsp_init(AVCodecContext *avctx, vorbis_enc_context *venc)
{
int ret = 0;
venc->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
if (!venc->fdsp)
return AVERROR(ENOMEM);
// init windows
venc->win[0] = ff_vorbis_vwin[venc->log2_blocksize[0] - 6];
venc->win[1] = ff_vorbis_vwin[venc->log2_blocksize[1] - 6];
if ((ret = ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0, 1.0)) < 0)
return ret;
if ((ret = ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0, 1.0)) < 0)
return ret;
return 0;
}
static int create_vorbis_context(vorbis_enc_context *venc,
AVCodecContext *avctx)
{
vorbis_enc_floor *fc;
vorbis_enc_residue *rc;
vorbis_enc_mapping *mc;
int i, book, ret;
venc->channels = avctx->channels;
venc->sample_rate = avctx->sample_rate;
venc->log2_blocksize[0] = venc->log2_blocksize[1] = 11;
venc->ncodebooks = FF_ARRAY_ELEMS(cvectors);
venc->codebooks = av_malloc(sizeof(vorbis_enc_codebook) * venc->ncodebooks);
if (!venc->codebooks)
return AVERROR(ENOMEM);
// codebook 0..14 - floor1 book, values 0..255
// codebook 15 residue masterbook
// codebook 16..29 residue
for (book = 0; book < venc->ncodebooks; book++) {
vorbis_enc_codebook *cb = &venc->codebooks[book];
int vals;
cb->ndimensions = cvectors[book].dim;
cb->nentries = cvectors[book].real_len;
cb->min = cvectors[book].min;
cb->delta = cvectors[book].delta;
cb->lookup = cvectors[book].lookup;
cb->seq_p = 0;
cb->lens = av_malloc_array(cb->nentries, sizeof(uint8_t));
cb->codewords = av_malloc_array(cb->nentries, sizeof(uint32_t));
if (!cb->lens || !cb->codewords)
return AVERROR(ENOMEM);
memcpy(cb->lens, cvectors[book].clens, cvectors[book].len);
memset(cb->lens + cvectors[book].len, 0, cb->nentries - cvectors[book].len);
if (cb->lookup) {
vals = cb_lookup_vals(cb->lookup, cb->ndimensions, cb->nentries);
cb->quantlist = av_malloc_array(vals, sizeof(int));
if (!cb->quantlist)
return AVERROR(ENOMEM);
for (i = 0; i < vals; i++)
cb->quantlist[i] = cvectors[book].quant[i];
} else {
cb->quantlist = NULL;
}
if ((ret = ready_codebook(cb)) < 0)
return ret;
}
venc->nfloors = 1;
venc->floors = av_malloc(sizeof(vorbis_enc_floor) * venc->nfloors);
if (!venc->floors)
return AVERROR(ENOMEM);
// just 1 floor
fc = &venc->floors[0];
fc->partitions = NUM_FLOOR_PARTITIONS;
fc->partition_to_class = av_malloc(sizeof(int) * fc->partitions);
if (!fc->partition_to_class)
return AVERROR(ENOMEM);
fc->nclasses = 0;
for (i = 0; i < fc->partitions; i++) {
static const int a[] = {0, 1, 2, 2, 3, 3, 4, 4};
fc->partition_to_class[i] = a[i];
fc->nclasses = FFMAX(fc->nclasses, fc->partition_to_class[i]);
}
fc->nclasses++;
fc->classes = av_malloc_array(fc->nclasses, sizeof(vorbis_enc_floor_class));
if (!fc->classes)
return AVERROR(ENOMEM);
for (i = 0; i < fc->nclasses; i++) {
vorbis_enc_floor_class * c = &fc->classes[i];
int j, books;
c->dim = floor_classes[i].dim;
c->subclass = floor_classes[i].subclass;
c->masterbook = floor_classes[i].masterbook;
books = (1 << c->subclass);
c->books = av_malloc_array(books, sizeof(int));
if (!c->books)
return AVERROR(ENOMEM);
for (j = 0; j < books; j++)
c->books[j] = floor_classes[i].nbooks[j];
}
fc->multiplier = 2;
fc->rangebits = venc->log2_blocksize[1] - 1;
fc->values = 2;
for (i = 0; i < fc->partitions; i++)
fc->values += fc->classes[fc->partition_to_class[i]].dim;
fc->list = av_malloc_array(fc->values, sizeof(vorbis_floor1_entry));
if (!fc->list)
return AVERROR(ENOMEM);
fc->list[0].x = 0;
fc->list[1].x = 1 << fc->rangebits;
for (i = 2; i < fc->values; i++) {
static const int a[] = {
93, 23,372, 6, 46,186,750, 14, 33, 65,
130,260,556, 3, 10, 18, 28, 39, 55, 79,
111,158,220,312,464,650,850
};
fc->list[i].x = a[i - 2];
}
if (ff_vorbis_ready_floor1_list(avctx, fc->list, fc->values))
return AVERROR_BUG;
venc->nresidues = 1;
venc->residues = av_malloc(sizeof(vorbis_enc_residue) * venc->nresidues);
if (!venc->residues)
return AVERROR(ENOMEM);
// single residue
rc = &venc->residues[0];
rc->type = 2;
rc->begin = 0;
rc->end = 1600;
rc->partition_size = 32;
rc->classifications = 10;
rc->classbook = 15;
rc->books = av_malloc(sizeof(*rc->books) * rc->classifications);
if (!rc->books)
return AVERROR(ENOMEM);
{
static const int8_t a[10][8] = {
{ -1, -1, -1, -1, -1, -1, -1, -1, },
{ -1, -1, 16, -1, -1, -1, -1, -1, },
{ -1, -1, 17, -1, -1, -1, -1, -1, },
{ -1, -1, 18, -1, -1, -1, -1, -1, },
{ -1, -1, 19, -1, -1, -1, -1, -1, },
{ -1, -1, 20, -1, -1, -1, -1, -1, },
{ -1, -1, 21, -1, -1, -1, -1, -1, },
{ 22, 23, -1, -1, -1, -1, -1, -1, },
{ 24, 25, -1, -1, -1, -1, -1, -1, },
{ 26, 27, 28, -1, -1, -1, -1, -1, },
};
memcpy(rc->books, a, sizeof a);
}
if ((ret = ready_residue(rc, venc)) < 0)
return ret;
venc->nmappings = 1;
venc->mappings = av_malloc(sizeof(vorbis_enc_mapping) * venc->nmappings);
if (!venc->mappings)
return AVERROR(ENOMEM);
// single mapping
mc = &venc->mappings[0];
mc->submaps = 1;
mc->mux = av_malloc(sizeof(int) * venc->channels);
if (!mc->mux)
return AVERROR(ENOMEM);
for (i = 0; i < venc->channels; i++)
mc->mux[i] = 0;
mc->floor = av_malloc(sizeof(int) * mc->submaps);
mc->residue = av_malloc(sizeof(int) * mc->submaps);
if (!mc->floor || !mc->residue)
return AVERROR(ENOMEM);
for (i = 0; i < mc->submaps; i++) {
mc->floor[i] = 0;
mc->residue[i] = 0;
}
mc->coupling_steps = venc->channels == 2 ? 1 : 0;
mc->magnitude = av_malloc(sizeof(int) * mc->coupling_steps);
mc->angle = av_malloc(sizeof(int) * mc->coupling_steps);
if (!mc->magnitude || !mc->angle)
return AVERROR(ENOMEM);
if (mc->coupling_steps) {
mc->magnitude[0] = 0;
mc->angle[0] = 1;
}
venc->nmodes = 2;
venc->modes = av_malloc(sizeof(vorbis_enc_mode) * venc->nmodes);
if (!venc->modes)
return AVERROR(ENOMEM);
// Short block
venc->modes[0].blockflag = 0;
venc->modes[0].mapping = 0;
// Long block
venc->modes[1].blockflag = 1;
venc->modes[1].mapping = 0;
venc->have_saved = 0;
venc->saved = av_malloc_array(sizeof(float) * venc->channels, (1 << venc->log2_blocksize[1]) / 2);
venc->samples = av_malloc_array(sizeof(float) * venc->channels, (1 << venc->log2_blocksize[1]));
venc->floor = av_malloc_array(sizeof(float) * venc->channels, (1 << venc->log2_blocksize[1]) / 2);
venc->coeffs = av_malloc_array(sizeof(float) * venc->channels, (1 << venc->log2_blocksize[1]) / 2);
venc->scratch = av_malloc_array(sizeof(float) * venc->channels, (1 << venc->log2_blocksize[1]));
if (!venc->saved || !venc->samples || !venc->floor || !venc->coeffs || !venc->scratch)
return AVERROR(ENOMEM);
if ((ret = dsp_init(avctx, venc)) < 0)
return ret;
return 0;
}
static void put_float(PutBitContext *pb, float f)
{
int exp, mant;
uint32_t res = 0;
mant = (int)ldexp(frexp(f, &exp), 20);
exp += 788 - 20;
if (mant < 0) {
res |= (1U << 31);
mant = -mant;
}
res |= mant | (exp << 21);
put_bits32(pb, res);
}
static void put_codebook_header(PutBitContext *pb, vorbis_enc_codebook *cb)
{
int i;
int ordered = 0;
put_bits(pb, 24, 0x564342); //magic
put_bits(pb, 16, cb->ndimensions);
put_bits(pb, 24, cb->nentries);
for (i = 1; i < cb->nentries; i++)
if (cb->lens[i] < cb->lens[i-1])
break;
if (i == cb->nentries)
ordered = 1;
put_bits(pb, 1, ordered);
if (ordered) {
int len = cb->lens[0];
put_bits(pb, 5, len - 1);
i = 0;
while (i < cb->nentries) {
int j;
for (j = 0; j+i < cb->nentries; j++)
if (cb->lens[j+i] != len)
break;
put_bits(pb, ilog(cb->nentries - i), j);
i += j;
len++;
}
} else {
int sparse = 0;
for (i = 0; i < cb->nentries; i++)
if (!cb->lens[i])
break;
if (i != cb->nentries)
sparse = 1;
put_bits(pb, 1, sparse);
for (i = 0; i < cb->nentries; i++) {
if (sparse)
put_bits(pb, 1, !!cb->lens[i]);
if (cb->lens[i])
put_bits(pb, 5, cb->lens[i] - 1);
}
}
put_bits(pb, 4, cb->lookup);
if (cb->lookup) {
int tmp = cb_lookup_vals(cb->lookup, cb->ndimensions, cb->nentries);
int bits = ilog(cb->quantlist[0]);
for (i = 1; i < tmp; i++)
bits = FFMAX(bits, ilog(cb->quantlist[i]));
put_float(pb, cb->min);
put_float(pb, cb->delta);
put_bits(pb, 4, bits - 1);
put_bits(pb, 1, cb->seq_p);
for (i = 0; i < tmp; i++)
put_bits(pb, bits, cb->quantlist[i]);
}
}
static void put_floor_header(PutBitContext *pb, vorbis_enc_floor *fc)
{
int i;
put_bits(pb, 16, 1); // type, only floor1 is supported
put_bits(pb, 5, fc->partitions);
for (i = 0; i < fc->partitions; i++)
put_bits(pb, 4, fc->partition_to_class[i]);
for (i = 0; i < fc->nclasses; i++) {
int j, books;
put_bits(pb, 3, fc->classes[i].dim - 1);
put_bits(pb, 2, fc->classes[i].subclass);
if (fc->classes[i].subclass)
put_bits(pb, 8, fc->classes[i].masterbook);
books = (1 << fc->classes[i].subclass);
for (j = 0; j < books; j++)
put_bits(pb, 8, fc->classes[i].books[j] + 1);
}
put_bits(pb, 2, fc->multiplier - 1);
put_bits(pb, 4, fc->rangebits);
for (i = 2; i < fc->values; i++)
put_bits(pb, fc->rangebits, fc->list[i].x);
}
static void put_residue_header(PutBitContext *pb, vorbis_enc_residue *rc)
{
int i;
put_bits(pb, 16, rc->type);
put_bits(pb, 24, rc->begin);
put_bits(pb, 24, rc->end);
put_bits(pb, 24, rc->partition_size - 1);
put_bits(pb, 6, rc->classifications - 1);
put_bits(pb, 8, rc->classbook);
for (i = 0; i < rc->classifications; i++) {
int j, tmp = 0;
for (j = 0; j < 8; j++)
tmp |= (rc->books[i][j] != -1) << j;
put_bits(pb, 3, tmp & 7);
put_bits(pb, 1, tmp > 7);
if (tmp > 7)
put_bits(pb, 5, tmp >> 3);
}
for (i = 0; i < rc->classifications; i++) {
int j;
for (j = 0; j < 8; j++)
if (rc->books[i][j] != -1)
put_bits(pb, 8, rc->books[i][j]);
}
}
static int put_main_header(vorbis_enc_context *venc, uint8_t **out)
{
int i;
PutBitContext pb;
int len, hlens[3];
int buffer_len = 50000;
uint8_t *buffer = av_mallocz(buffer_len), *p = buffer;
if (!buffer)
return AVERROR(ENOMEM);
// identification header
init_put_bits(&pb, p, buffer_len);
put_bits(&pb, 8, 1); //magic
for (i = 0; "vorbis"[i]; i++)
put_bits(&pb, 8, "vorbis"[i]);
put_bits32(&pb, 0); // version
put_bits(&pb, 8, venc->channels);
put_bits32(&pb, venc->sample_rate);
put_bits32(&pb, 0); // bitrate
put_bits32(&pb, 0); // bitrate
put_bits32(&pb, 0); // bitrate
put_bits(&pb, 4, venc->log2_blocksize[0]);
put_bits(&pb, 4, venc->log2_blocksize[1]);
put_bits(&pb, 1, 1); // framing
flush_put_bits(&pb);
hlens[0] = put_bits_count(&pb) >> 3;
buffer_len -= hlens[0];
p += hlens[0];
// comment header
init_put_bits(&pb, p, buffer_len);
put_bits(&pb, 8, 3); //magic
for (i = 0; "vorbis"[i]; i++)
put_bits(&pb, 8, "vorbis"[i]);
put_bits32(&pb, 0); // vendor length TODO
put_bits32(&pb, 0); // amount of comments
put_bits(&pb, 1, 1); // framing
flush_put_bits(&pb);
hlens[1] = put_bits_count(&pb) >> 3;
buffer_len -= hlens[1];
p += hlens[1];
// setup header
init_put_bits(&pb, p, buffer_len);
put_bits(&pb, 8, 5); //magic
for (i = 0; "vorbis"[i]; i++)
put_bits(&pb, 8, "vorbis"[i]);
// codebooks
put_bits(&pb, 8, venc->ncodebooks - 1);
for (i = 0; i < venc->ncodebooks; i++)
put_codebook_header(&pb, &venc->codebooks[i]);
// time domain, reserved, zero
put_bits(&pb, 6, 0);
put_bits(&pb, 16, 0);
// floors
put_bits(&pb, 6, venc->nfloors - 1);
for (i = 0; i < venc->nfloors; i++)
put_floor_header(&pb, &venc->floors[i]);
// residues
put_bits(&pb, 6, venc->nresidues - 1);
for (i = 0; i < venc->nresidues; i++)
put_residue_header(&pb, &venc->residues[i]);
// mappings
put_bits(&pb, 6, venc->nmappings - 1);
for (i = 0; i < venc->nmappings; i++) {
vorbis_enc_mapping *mc = &venc->mappings[i];
int j;
put_bits(&pb, 16, 0); // mapping type
put_bits(&pb, 1, mc->submaps > 1);
if (mc->submaps > 1)
put_bits(&pb, 4, mc->submaps - 1);
put_bits(&pb, 1, !!mc->coupling_steps);
if (mc->coupling_steps) {
put_bits(&pb, 8, mc->coupling_steps - 1);
for (j = 0; j < mc->coupling_steps; j++) {
put_bits(&pb, ilog(venc->channels - 1), mc->magnitude[j]);
put_bits(&pb, ilog(venc->channels - 1), mc->angle[j]);
}
}
put_bits(&pb, 2, 0); // reserved
if (mc->submaps > 1)
for (j = 0; j < venc->channels; j++)
put_bits(&pb, 4, mc->mux[j]);
for (j = 0; j < mc->submaps; j++) {
put_bits(&pb, 8, 0); // reserved time configuration
put_bits(&pb, 8, mc->floor[j]);
put_bits(&pb, 8, mc->residue[j]);
}
}
// modes
put_bits(&pb, 6, venc->nmodes - 1);
for (i = 0; i < venc->nmodes; i++) {
put_bits(&pb, 1, venc->modes[i].blockflag);
put_bits(&pb, 16, 0); // reserved window type
put_bits(&pb, 16, 0); // reserved transform type
put_bits(&pb, 8, venc->modes[i].mapping);
}
put_bits(&pb, 1, 1); // framing
flush_put_bits(&pb);
hlens[2] = put_bits_count(&pb) >> 3;
len = hlens[0] + hlens[1] + hlens[2];
p = *out = av_mallocz(64 + len + len/255);
if (!p)
return AVERROR(ENOMEM);
*p++ = 2;
p += av_xiphlacing(p, hlens[0]);
p += av_xiphlacing(p, hlens[1]);
buffer_len = 0;
for (i = 0; i < 3; i++) {
memcpy(p, buffer + buffer_len, hlens[i]);
p += hlens[i];
buffer_len += hlens[i];
}
av_freep(&buffer);
return p - *out;
}
static float get_floor_average(vorbis_enc_floor * fc, float *coeffs, int i)
{
int begin = fc->list[fc->list[FFMAX(i-1, 0)].sort].x;
int end = fc->list[fc->list[FFMIN(i+1, fc->values - 1)].sort].x;
int j;
float average = 0;
for (j = begin; j < end; j++)
average += fabs(coeffs[j]);
return average / (end - begin);
}
static void floor_fit(vorbis_enc_context *venc, vorbis_enc_floor *fc,
float *coeffs, uint16_t *posts, int samples)
{
int range = 255 / fc->multiplier + 1;
int i;
float tot_average = 0.0;
float averages[MAX_FLOOR_VALUES];
for (i = 0; i < fc->values; i++) {
averages[i] = get_floor_average(fc, coeffs, i);
tot_average += averages[i];
}
tot_average /= fc->values;
tot_average /= venc->quality;
for (i = 0; i < fc->values; i++) {
int position = fc->list[fc->list[i].sort].x;
float average = averages[i];
int j;
average = sqrt(tot_average * average) * pow(1.25f, position*0.005f); // MAGIC!
for (j = 0; j < range - 1; j++)
if (ff_vorbis_floor1_inverse_db_table[j * fc->multiplier] > average)
break;
posts[fc->list[i].sort] = j;
}
}
static int render_point(int x0, int y0, int x1, int y1, int x)
{
return y0 + (x - x0) * (y1 - y0) / (x1 - x0);
}
static int floor_encode(vorbis_enc_context *venc, vorbis_enc_floor *fc,
PutBitContext *pb, uint16_t *posts,
float *floor, int samples)
{
int range = 255 / fc->multiplier + 1;
int coded[MAX_FLOOR_VALUES]; // first 2 values are unused
int i, counter;
if (pb->size_in_bits - put_bits_count(pb) < 1 + 2 * ilog(range - 1))
return AVERROR(EINVAL);
put_bits(pb, 1, 1); // non zero
put_bits(pb, ilog(range - 1), posts[0]);
put_bits(pb, ilog(range - 1), posts[1]);
coded[0] = coded[1] = 1;
for (i = 2; i < fc->values; i++) {
int predicted = render_point(fc->list[fc->list[i].low].x,
posts[fc->list[i].low],
fc->list[fc->list[i].high].x,
posts[fc->list[i].high],
fc->list[i].x);
int highroom = range - predicted;
int lowroom = predicted;
int room = FFMIN(highroom, lowroom);
if (predicted == posts[i]) {
coded[i] = 0; // must be used later as flag!
continue;
} else {
if (!coded[fc->list[i].low ])
coded[fc->list[i].low ] = -1;
if (!coded[fc->list[i].high])
coded[fc->list[i].high] = -1;
}
if (posts[i] > predicted) {
if (posts[i] - predicted > room)
coded[i] = posts[i] - predicted + lowroom;
else
coded[i] = (posts[i] - predicted) << 1;
} else {
if (predicted - posts[i] > room)
coded[i] = predicted - posts[i] + highroom - 1;
else
coded[i] = ((predicted - posts[i]) << 1) - 1;
}
}
counter = 2;
for (i = 0; i < fc->partitions; i++) {
vorbis_enc_floor_class * c = &fc->classes[fc->partition_to_class[i]];
int k, cval = 0, csub = 1<<c->subclass;
if (c->subclass) {
vorbis_enc_codebook * book = &venc->codebooks[c->masterbook];
int cshift = 0;
for (k = 0; k < c->dim; k++) {
int l;
for (l = 0; l < csub; l++) {
int maxval = 1;
if (c->books[l] != -1)
maxval = venc->codebooks[c->books[l]].nentries;
// coded could be -1, but this still works, cause that is 0
if (coded[counter + k] < maxval)
break;
}
assert(l != csub);
cval |= l << cshift;
cshift += c->subclass;
}
if (put_codeword(pb, book, cval))
return AVERROR(EINVAL);
}
for (k = 0; k < c->dim; k++) {
int book = c->books[cval & (csub-1)];
int entry = coded[counter++];
cval >>= c->subclass;
if (book == -1)
continue;
if (entry == -1)
entry = 0;
if (put_codeword(pb, &venc->codebooks[book], entry))
return AVERROR(EINVAL);
}
}
ff_vorbis_floor1_render_list(fc->list, fc->values, posts, coded,
fc->multiplier, floor, samples);
return 0;
}
static float *put_vector(vorbis_enc_codebook *book, PutBitContext *pb,
float *num)
{
int i, entry = -1;
float distance = FLT_MAX;
assert(book->dimensions);
for (i = 0; i < book->nentries; i++) {
float * vec = book->dimensions + i * book->ndimensions, d = book->pow2[i];
int j;
if (!book->lens[i])
continue;
for (j = 0; j < book->ndimensions; j++)
d -= vec[j] * num[j];
if (distance > d) {
entry = i;
distance = d;
}
}
if (put_codeword(pb, book, entry))
return NULL;
return &book->dimensions[entry * book->ndimensions];
}
static int residue_encode(vorbis_enc_context *venc, vorbis_enc_residue *rc,
PutBitContext *pb, float *coeffs, int samples,
int real_ch)
{
int pass, i, j, p, k;
int psize = rc->partition_size;
int partitions = (rc->end - rc->begin) / psize;
int channels = (rc->type == 2) ? 1 : real_ch;
int classes[MAX_CHANNELS][NUM_RESIDUE_PARTITIONS];
int classwords = venc->codebooks[rc->classbook].ndimensions;
av_assert0(rc->type == 2);
av_assert0(real_ch == 2);
for (p = 0; p < partitions; p++) {
float max1 = 0.0, max2 = 0.0;
int s = rc->begin + p * psize;
for (k = s; k < s + psize; k += 2) {
max1 = FFMAX(max1, fabs(coeffs[ k / real_ch]));
max2 = FFMAX(max2, fabs(coeffs[samples + k / real_ch]));
}
for (i = 0; i < rc->classifications - 1; i++)
if (max1 < rc->maxes[i][0] && max2 < rc->maxes[i][1])
break;
classes[0][p] = i;
}
for (pass = 0; pass < 8; pass++) {
p = 0;
while (p < partitions) {
if (pass == 0)
for (j = 0; j < channels; j++) {
vorbis_enc_codebook * book = &venc->codebooks[rc->classbook];
int entry = 0;
for (i = 0; i < classwords; i++) {
entry *= rc->classifications;
entry += classes[j][p + i];
}
if (put_codeword(pb, book, entry))
return AVERROR(EINVAL);
}
for (i = 0; i < classwords && p < partitions; i++, p++) {
for (j = 0; j < channels; j++) {
int nbook = rc->books[classes[j][p]][pass];
vorbis_enc_codebook * book = &venc->codebooks[nbook];
float *buf = coeffs + samples*j + rc->begin + p*psize;
if (nbook == -1)
continue;
assert(rc->type == 0 || rc->type == 2);
assert(!(psize % book->ndimensions));
if (rc->type == 0) {
for (k = 0; k < psize; k += book->ndimensions) {
int l;
float *a = put_vector(book, pb, &buf[k]);
if (!a)
return AVERROR(EINVAL);
for (l = 0; l < book->ndimensions; l++)
buf[k + l] -= a[l];
}
} else {
int s = rc->begin + p * psize, a1, b1;
a1 = (s % real_ch) * samples;
b1 = s / real_ch;
s = real_ch * samples;
for (k = 0; k < psize; k += book->ndimensions) {
int dim, a2 = a1, b2 = b1;
float vec[MAX_CODEBOOK_DIM], *pv = vec;
for (dim = book->ndimensions; dim--; ) {
*pv++ = coeffs[a2 + b2];
if ((a2 += samples) == s) {
a2 = 0;
b2++;
}
}
pv = put_vector(book, pb, vec);
if (!pv)
return AVERROR(EINVAL);
for (dim = book->ndimensions; dim--; ) {
coeffs[a1 + b1] -= *pv++;
if ((a1 += samples) == s) {
a1 = 0;
b1++;
}
}
}
}
}
}
}
}
return 0;
}
static int apply_window_and_mdct(vorbis_enc_context *venc)
{
int channel;
const float * win = venc->win[1];
int window_len = 1 << (venc->log2_blocksize[1] - 1);
float n = (float)(1 << venc->log2_blocksize[1]) / 4.0;
AVFloatDSPContext *fdsp = venc->fdsp;
for (channel = 0; channel < venc->channels; channel++) {
float *offset = venc->samples + channel * window_len * 2;
fdsp->vector_fmul(offset, offset, win, window_len);
fdsp->vector_fmul_scalar(offset, offset, 1/n, window_len);
offset += window_len;
fdsp->vector_fmul_reverse(offset, offset, win, window_len);
fdsp->vector_fmul_scalar(offset, offset, 1/n, window_len);
venc->mdct[1].mdct_calc(&venc->mdct[1], venc->coeffs + channel * window_len,
venc->samples + channel * window_len * 2);
}
return 1;
}
/* Used for padding the last encoded packet */
static AVFrame *spawn_empty_frame(AVCodecContext *avctx, int channels)
{
AVFrame *f = av_frame_alloc();
int ch;
if (!f)
return NULL;
f->format = avctx->sample_fmt;
f->nb_samples = avctx->frame_size;
f->channel_layout = avctx->channel_layout;
if (av_frame_get_buffer(f, 4)) {
av_frame_free(&f);
return NULL;
}
for (ch = 0; ch < channels; ch++) {
size_t bps = av_get_bytes_per_sample(f->format);
memset(f->extended_data[ch], 0, bps * f->nb_samples);
}
return f;
}
/* Set up audio samples for psy analysis and window/mdct */
static void move_audio(vorbis_enc_context *venc, int sf_size)
{
AVFrame *cur = NULL;
int frame_size = 1 << (venc->log2_blocksize[1] - 1);
int subframes = frame_size / sf_size;
int sf, ch;
/* Copy samples from last frame into current frame */
if (venc->have_saved)
for (ch = 0; ch < venc->channels; ch++)
memcpy(venc->samples + 2 * ch * frame_size,
venc->saved + ch * frame_size, sizeof(float) * frame_size);
else
for (ch = 0; ch < venc->channels; ch++)
memset(venc->samples + 2 * ch * frame_size, 0, sizeof(float) * frame_size);
for (sf = 0; sf < subframes; sf++) {
cur = ff_bufqueue_get(&venc->bufqueue);
for (ch = 0; ch < venc->channels; ch++) {
float *offset = venc->samples + 2 * ch * frame_size + frame_size;
float *save = venc->saved + ch * frame_size;
const float *input = (float *) cur->extended_data[ch];
const size_t len = cur->nb_samples * sizeof(float);
memcpy(offset + sf*sf_size, input, len);
memcpy(save + sf*sf_size, input, len); // Move samples for next frame
}
av_frame_free(&cur);
}
venc->have_saved = 1;
memcpy(venc->scratch, venc->samples, 2 * venc->channels * frame_size);
}
static int vorbis_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
const AVFrame *frame, int *got_packet_ptr)
{
vorbis_enc_context *venc = avctx->priv_data;
int i, ret, need_more;
int frame_size = 1 << (venc->log2_blocksize[1] - 1);
vorbis_enc_mode *mode;
vorbis_enc_mapping *mapping;
PutBitContext pb;
if (frame) {
AVFrame *clone;
if ((ret = ff_af_queue_add(&venc->afq, frame)) < 0)
return ret;
clone = av_frame_clone(frame);
if (!clone)
return AVERROR(ENOMEM);
ff_bufqueue_add(avctx, &venc->bufqueue, clone);
} else
if (!venc->afq.remaining_samples)
return 0;
need_more = venc->bufqueue.available * avctx->frame_size < frame_size;
need_more = frame && need_more;
if (need_more)
return 0;
/* Pad the bufqueue with empty frames for encoding the last packet. */
if (!frame) {
if (venc->bufqueue.available * avctx->frame_size < frame_size) {
int frames_needed = (frame_size/avctx->frame_size) - venc->bufqueue.available;
int i;
for (i = 0; i < frames_needed; i++) {
AVFrame *empty = spawn_empty_frame(avctx, venc->channels);
if (!empty)
return AVERROR(ENOMEM);
ff_bufqueue_add(avctx, &venc->bufqueue, empty);
}
}
}
move_audio(venc, avctx->frame_size);
if (!apply_window_and_mdct(venc))
return 0;
if ((ret = ff_alloc_packet2(avctx, avpkt, 8192, 0)) < 0)
return ret;
init_put_bits(&pb, avpkt->data, avpkt->size);
if (pb.size_in_bits - put_bits_count(&pb) < 1 + ilog(venc->nmodes - 1)) {
av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
return AVERROR(EINVAL);
}
put_bits(&pb, 1, 0); // magic bit
put_bits(&pb, ilog(venc->nmodes - 1), 1); // Mode for current frame
mode = &venc->modes[1];
mapping = &venc->mappings[mode->mapping];
if (mode->blockflag) {
put_bits(&pb, 1, 1); // Previous windowflag
put_bits(&pb, 1, 1); // Next windowflag
}
for (i = 0; i < venc->channels; i++) {
vorbis_enc_floor *fc = &venc->floors[mapping->floor[mapping->mux[i]]];
uint16_t posts[MAX_FLOOR_VALUES];
floor_fit(venc, fc, &venc->coeffs[i * frame_size], posts, frame_size);
if (floor_encode(venc, fc, &pb, posts, &venc->floor[i * frame_size], frame_size)) {
av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
return AVERROR(EINVAL);
}
}
for (i = 0; i < venc->channels * frame_size; i++)
venc->coeffs[i] /= venc->floor[i];
for (i = 0; i < mapping->coupling_steps; i++) {
float *mag = venc->coeffs + mapping->magnitude[i] * frame_size;
float *ang = venc->coeffs + mapping->angle[i] * frame_size;
int j;
for (j = 0; j < frame_size; j++) {
float a = ang[j];
ang[j] -= mag[j];
if (mag[j] > 0)
ang[j] = -ang[j];
if (ang[j] < 0)
mag[j] = a;
}
}
if (residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]],
&pb, venc->coeffs, frame_size, venc->channels)) {
av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
return AVERROR(EINVAL);
}
flush_put_bits(&pb);
avpkt->size = put_bits_count(&pb) >> 3;
ff_af_queue_remove(&venc->afq, frame_size, &avpkt->pts, &avpkt->duration);
if (frame_size > avpkt->duration) {
uint8_t *side = av_packet_new_side_data(avpkt, AV_PKT_DATA_SKIP_SAMPLES, 10);
if (!side)
return AVERROR(ENOMEM);
AV_WL32(&side[4], frame_size - avpkt->duration);
}
*got_packet_ptr = 1;
return 0;
}
static av_cold int vorbis_encode_close(AVCodecContext *avctx)
{
vorbis_enc_context *venc = avctx->priv_data;
int i;
if (venc->codebooks)
for (i = 0; i < venc->ncodebooks; i++) {
av_freep(&venc->codebooks[i].lens);
av_freep(&venc->codebooks[i].codewords);
av_freep(&venc->codebooks[i].quantlist);
av_freep(&venc->codebooks[i].dimensions);
av_freep(&venc->codebooks[i].pow2);
}
av_freep(&venc->codebooks);
if (venc->floors)
for (i = 0; i < venc->nfloors; i++) {
int j;
if (venc->floors[i].classes)
for (j = 0; j < venc->floors[i].nclasses; j++)
av_freep(&venc->floors[i].classes[j].books);
av_freep(&venc->floors[i].classes);
av_freep(&venc->floors[i].partition_to_class);
av_freep(&venc->floors[i].list);
}
av_freep(&venc->floors);
if (venc->residues)
for (i = 0; i < venc->nresidues; i++) {
av_freep(&venc->residues[i].books);
av_freep(&venc->residues[i].maxes);
}
av_freep(&venc->residues);
if (venc->mappings)
for (i = 0; i < venc->nmappings; i++) {
av_freep(&venc->mappings[i].mux);
av_freep(&venc->mappings[i].floor);
av_freep(&venc->mappings[i].residue);
av_freep(&venc->mappings[i].magnitude);
av_freep(&venc->mappings[i].angle);
}
av_freep(&venc->mappings);
av_freep(&venc->modes);
av_freep(&venc->saved);
av_freep(&venc->samples);
av_freep(&venc->floor);
av_freep(&venc->coeffs);
av_freep(&venc->scratch);
av_freep(&venc->fdsp);
ff_mdct_end(&venc->mdct[0]);
ff_mdct_end(&venc->mdct[1]);
ff_af_queue_close(&venc->afq);
ff_bufqueue_discard_all(&venc->bufqueue);
av_freep(&avctx->extradata);
return 0 ;
}
static av_cold int vorbis_encode_init(AVCodecContext *avctx)
{
vorbis_enc_context *venc = avctx->priv_data;
int ret;
if (avctx->channels != 2) {
av_log(avctx, AV_LOG_ERROR, "Current FFmpeg Vorbis encoder only supports 2 channels.\n");
return -1;
}
if ((ret = create_vorbis_context(venc, avctx)) < 0)
goto error;
avctx->bit_rate = 0;
if (avctx->flags & AV_CODEC_FLAG_QSCALE)
venc->quality = avctx->global_quality / (float)FF_QP2LAMBDA;
else
venc->quality = 8;
venc->quality *= venc->quality;
if ((ret = put_main_header(venc, (uint8_t**)&avctx->extradata)) < 0)
goto error;
avctx->extradata_size = ret;
avctx->frame_size = 64;
ff_af_queue_init(avctx, &venc->afq);
return 0;
error:
vorbis_encode_close(avctx);
return ret;
}
AVCodec ff_vorbis_encoder = {
.name = "vorbis",
.long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_VORBIS,
.priv_data_size = sizeof(vorbis_enc_context),
.init = vorbis_encode_init,
.encode2 = vorbis_encode_frame,
.close = vorbis_encode_close,
.capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_EXPERIMENTAL,
.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
AV_SAMPLE_FMT_NONE },
};
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