RepoMirrors/ffmpeg
1
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2024-12-15 19:55:08 +00:00
Code Issues Projects Releases Wiki Activity

Original Commit: r12 | ods15 | 2006-09-22 09:28:30 +0300 (Fri, 22 Sep 2006) | 5 lines

Browse Source 
entry_t -> cb_entry_t
add float * dimentions, it will be needed for deciding the correct codebook entry
document blocksize
first steps to creating the context to be used

Originally committed as revision 6423 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Oded Shimon 2006-10-02 05:55:33 +00:00
parent 8016c73f4c
commit 73acc51cd2
1 changed files with 110 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

126
libavcodec/vorbis_enc.c
View File

@ -37,18 +37,18 @@
typedef struct {
int len;
uint32_t codeword;
} entry_t;
} cb_entry_t;
typedef struct {
int nentries;
entry_t * entries;
cb_entry_t * entries;
int ndimentions;
float min;
float delta;
int seq_p;
int lookup;
//float * dimentions;
int * quantlist;
float * dimentions;
} codebook_t;
typedef struct {
@ -94,7 +94,7 @@ typedef struct {
typedef struct {
int channels;
int sample_rate;
int blocksize[2];
int blocksize[2]; // in (1<<n) format
int ncodebooks;
codebook_t * codebooks;
@ -112,6 +112,109 @@ typedef struct {
vorbis_mode_t * modes;
} venc_context_t;
static int cb_lookup_vals(int lookup, int dimentions, int entries) {
if (lookup == 1) {
int tmp, i;
for (tmp = 0; ; tmp++) {
int n = 1;
for (i = 0; i < dimentions; i++) n *= tmp;
if (n > entries) break;
}
return tmp - 1;
} else if (lookup == 2) return dimentions * entries;
return 0;
}
static void ready_codebook(codebook_t * cb) {
int h[33] = { 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 };
int i;
for (i = 0; i < cb->nentries; i++) {
cb_entry_t * e = &cb->entries[i];
int j = 0;
if (h[0]) h[0] = 0;
else for (j = e->len; !h[j]; j--) assert(j);
e->codeword = h[j];
h[j] = 0;
for (j++; j <= e->len; j++) h[j] = e->codeword | (1 << (j - 1));
}
for (i = 0; i < 33; i++) assert(!h[i]);
if (!cb->lookup) cb->dimentions = NULL;
else {
int vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
cb->dimentions = av_malloc(sizeof(float) * cb->nentries * cb->ndimentions);
for (i = 0; i < cb->nentries; i++) {
float last = 0;
int j;
int div = 1;
for (j = 0; j < cb->ndimentions; j++) {
int off;
if (cb->lookup == 1) off = (i / div) % vals; // lookup type 1
else off = i * cb->ndimentions + j; // lookup type 2
cb->dimentions[i * cb->ndimentions + j] = last + cb->min + cb->quantlist[off] * cb->delta;
if (cb->seq_p) last = cb->dimentions[i * cb->ndimentions + j];
div *= vals;
}
}
}
}
static void create_vorbis_context(venc_context_t * venc, AVCodecContext * avccontext) {
codebook_t * cb;
int i;
venc->channels = avccontext->channels;
venc->sample_rate = avccontext->sample_rate;
venc->blocksize[0] = venc->blocksize[1] = 8;
venc->ncodebooks = 3;
venc->codebooks = av_malloc(sizeof(codebook_t) * venc->ncodebooks);
// codebook 1 - floor1 book, values 0..255
cb = &venc->codebooks[0];
cb->nentries = 256;
cb->entries = av_malloc(sizeof(cb_entry_t) * cb->nentries);
for (i = 0; i < cb->nentries; i++) cb->entries[i].len = 8;
cb->ndimentions = 0;
cb->min = 0.;
cb->delta = 0.;
cb->seq_p = 0;
cb->lookup = 0;
cb->quantlist = NULL;
ready_codebook(cb);
// codebook 2 - classbook, values 0..0, dimentions 200
cb = &venc->codebooks[1];
cb->nentries = 1;
cb->entries = av_malloc(sizeof(cb_entry_t) * cb->nentries);
for (i = 0; i < cb->nentries; i++) cb->entries[i].len = 1;
cb->ndimentions = 200;
cb->min = 0.;
cb->delta = 0.;
cb->seq_p = 0;
cb->lookup = 0;
cb->quantlist = NULL;
ready_codebook(cb);
// codebook 3 - vector, for the residue, dimentions 1. values -32768..32767
cb = &venc->codebooks[2];
cb->nentries = 32767 - (-32768);
cb->entries = av_malloc(sizeof(cb_entry_t) * cb->nentries);
for (i = 0; i < cb->nentries; i++) cb->entries[i].len = 16;
cb->ndimentions = 1;
cb->min = -32768.;
cb->delta = 1.;
cb->seq_p = 0;
cb->lookup = 2;
cb->quantlist = av_malloc(sizeof(int) * cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries));
for (i = 0; i < cb->nentries; i++) cb->quantlist[i] = i;
ready_codebook(cb);
}
static inline int ilog(unsigned int a) {
int i;
for (i = 0; a >> i; i++);
@ -165,16 +268,8 @@ static void put_codebook_header(PutBitContext * pb, codebook_t * cb) {
put_bits(pb, 4, cb->lookup);
if (cb->lookup) {
int tmp, bits = ilog(cb->quantlist[0]);
if (cb->lookup == 1) {
for (tmp = 0; ; tmp++) {
int n = 1;
for (i = 0; i < cb->ndimentions; i++) n *= tmp;
if (n > cb->nentries) break;
}
tmp--;
} else tmp = cb->ndimentions * cb->nentries;
int tmp = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
int bits = ilog(cb->quantlist[0]);
for (i = 1; i < tmp; i++) bits = FFMIN(bits, ilog(cb->quantlist[i]));
@ -360,8 +455,7 @@ static int vorbis_encode_init(AVCodecContext * avccontext)
{
venc_context_t * venc = avccontext->priv_data;
venc->channels = avccontext->channels;
venc->sample_rate = avccontext->sample_rate;
create_vorbis_context(venc, avccontext);
//if (avccontext->flags & CODEC_FLAG_QSCALE) avccontext->global_quality / (float)FF_QP2LAMBDA); else avccontext->bit_rate;
//if(avccontext->cutoff > 0) cfreq = avccontext->cutoff / 1000.0;