Mercurial > hg > pmhd
diff ffmpeg/libavcodec/vorbisenc.c @ 10:6840f77b83aa
commit
| author | Yading Song <yading.song@eecs.qmul.ac.uk> |
|---|---|
| date | Sun, 21 Apr 2013 10:55:35 +0200 |
| parents | |
| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/ffmpeg/libavcodec/vorbisenc.c Sun Apr 21 10:55:35 2013 +0200 @@ -0,0 +1,1205 @@ +/* + * 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 "avcodec.h" +#include "internal.h" +#include "fft.h" +#include "vorbis.h" +#include "vorbis_enc_data.h" + +#define BITSTREAM_WRITER_LE +#include "put_bits.h" + +#undef NDEBUG +#include <assert.h> + +typedef struct { + 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 { + int dim; + int subclass; + int masterbook; + int *books; +} vorbis_enc_floor_class; + +typedef struct { + 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 { + 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 { + int submaps; + int *mux; + int *floor; + int *residue; + int coupling_steps; + int *magnitude; + int *angle; +} vorbis_enc_mapping; + +typedef struct { + int blockflag; + int mapping; +} vorbis_enc_mode; + +typedef struct { + 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 quality; + + 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; +} 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) +{ + assert(entry >= 0); + assert(entry < cb->nentries); + assert(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(sizeof(float) * cb->nentries * cb->ndimensions); + cb->pow2 = av_mallocz(sizeof(float) * cb->nentries); + 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.; + } + } + return 0; +} + +static int ready_residue(vorbis_enc_residue *rc, vorbis_enc_context *venc) +{ + int i; + assert(rc->type == 2); + rc->maxes = av_mallocz(sizeof(float[2]) * rc->classifications); + 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 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(sizeof(uint8_t) * cb->nentries); + cb->codewords = av_malloc(sizeof(uint32_t) * cb->nentries); + 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(sizeof(int) * vals); + 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(sizeof(vorbis_enc_floor_class) * fc->nclasses); + 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(sizeof(int) * books); + 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[0] - 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(sizeof(vorbis_floor1_entry) * fc->values); + 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 = 1; + venc->modes = av_malloc(sizeof(vorbis_enc_mode) * venc->nmodes); + if (!venc->modes) + return AVERROR(ENOMEM); + + // single mode + venc->modes[0].blockflag = 0; + venc->modes[0].mapping = 0; + + venc->have_saved = 0; + venc->saved = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2); + venc->samples = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1])); + venc->floor = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2); + venc->coeffs = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2); + if (!venc->saved || !venc->samples || !venc->floor || !venc->coeffs) + return AVERROR(ENOMEM); + + 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 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; + uint8_t buffer[50000] = {0}, *p = buffer; + int buffer_len = sizeof buffer; + int len, hlens[3]; + + // 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]; + } + + 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.; + 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; + + assert(rc->type == 2); + assert(real_ch == 2); + for (p = 0; p < partitions; p++) { + float max1 = 0., max2 = 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, + float **audio, int samples) +{ + int i, channel; + const float * win = venc->win[0]; + int window_len = 1 << (venc->log2_blocksize[0] - 1); + float n = (float)(1 << venc->log2_blocksize[0]) / 4.; + // FIXME use dsp + + if (!venc->have_saved && !samples) + return 0; + + if (venc->have_saved) { + for (channel = 0; channel < venc->channels; channel++) + memcpy(venc->samples + channel * window_len * 2, + venc->saved + channel * window_len, sizeof(float) * window_len); + } else { + for (channel = 0; channel < venc->channels; channel++) + memset(venc->samples + channel * window_len * 2, 0, + sizeof(float) * window_len); + } + + if (samples) { + for (channel = 0; channel < venc->channels; channel++) { + float * offset = venc->samples + channel*window_len*2 + window_len; + for (i = 0; i < samples; i++) + offset[i] = audio[channel][i] / n * win[window_len - i - 1]; + } + } else { + for (channel = 0; channel < venc->channels; channel++) + memset(venc->samples + channel * window_len * 2 + window_len, + 0, sizeof(float) * window_len); + } + + for (channel = 0; channel < venc->channels; channel++) + venc->mdct[0].mdct_calc(&venc->mdct[0], venc->coeffs + channel * window_len, + venc->samples + channel * window_len * 2); + + if (samples) { + for (channel = 0; channel < venc->channels; channel++) { + float *offset = venc->saved + channel * window_len; + for (i = 0; i < samples; i++) + offset[i] = audio[channel][i] / n * win[i]; + } + venc->have_saved = 1; + } else { + venc->have_saved = 0; + } + return 1; +} + +static int vorbis_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, + const AVFrame *frame, int *got_packet_ptr) +{ + vorbis_enc_context *venc = avctx->priv_data; + float **audio = frame ? (float **)frame->extended_data : NULL; + int samples = frame ? frame->nb_samples : 0; + vorbis_enc_mode *mode; + vorbis_enc_mapping *mapping; + PutBitContext pb; + int i, ret; + + if (!apply_window_and_mdct(venc, audio, samples)) + return 0; + samples = 1 << (venc->log2_blocksize[0] - 1); + + if ((ret = ff_alloc_packet2(avctx, avpkt, 8192)) < 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), 0); // 0 bits, the mode + + mode = &venc->modes[0]; + mapping = &venc->mappings[mode->mapping]; + if (mode->blockflag) { + put_bits(&pb, 1, 0); + put_bits(&pb, 1, 0); + } + + 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 * samples], posts, samples); + if (floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples)) { + av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n"); + return AVERROR(EINVAL); + } + } + + for (i = 0; i < venc->channels * samples; i++) + venc->coeffs[i] /= venc->floor[i]; + + for (i = 0; i < mapping->coupling_steps; i++) { + float *mag = venc->coeffs + mapping->magnitude[i] * samples; + float *ang = venc->coeffs + mapping->angle[i] * samples; + int j; + for (j = 0; j < samples; 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, samples, 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; + + avpkt->duration = ff_samples_to_time_base(avctx, avctx->frame_size); + if (frame) { + if (frame->pts != AV_NOPTS_VALUE) + avpkt->pts = ff_samples_to_time_base(avctx, frame->pts); + } else + avpkt->pts = venc->next_pts; + if (avpkt->pts != AV_NOPTS_VALUE) + venc->next_pts = avpkt->pts + 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); + + ff_mdct_end(&venc->mdct[0]); + ff_mdct_end(&venc->mdct[1]); + + 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 & 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 = 1 << (venc->log2_blocksize[0] - 1); + + return 0; +error: + vorbis_encode_close(avctx); + return ret; +} + +AVCodec ff_vorbis_encoder = { + .name = "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 = CODEC_CAP_DELAY | CODEC_CAP_EXPERIMENTAL, + .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP, + AV_SAMPLE_FMT_NONE }, + .long_name = NULL_IF_CONFIG_SMALL("Vorbis"), +};