2 * WMA compatible encoder
3 * Copyright (c) 2007 Michael Niedermayer
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 static int encode_init(AVCodecContext * avctx){
30 WMACodecContext *s = avctx->priv_data;
31 int i, flags1, flags2;
36 if(avctx->channels > MAX_CHANNELS)
39 /* extract flag infos */
42 if (avctx->codec->id == CODEC_ID_WMAV1) {
43 extradata= av_malloc(4);
44 avctx->extradata_size= 4;
45 extradata[0] = flags1;
46 extradata[1] = flags1>>8;
47 extradata[2] = flags2;
48 extradata[3] = flags2>>8;
49 } else if (avctx->codec->id == CODEC_ID_WMAV2) {
50 extradata= av_mallocz(10);
51 avctx->extradata_size= 10;
52 extradata[0] = flags1;
53 extradata[1] = flags1>>8;
54 extradata[2] = flags1>>16;
55 extradata[3] = flags1>>24;
56 extradata[4] = flags2;
57 extradata[5] = flags2>>8;
60 avctx->extradata= extradata;
61 s->use_exp_vlc = flags2 & 0x0001;
62 s->use_bit_reservoir = flags2 & 0x0002;
63 s->use_variable_block_len = flags2 & 0x0004;
65 ff_wma_init(avctx, flags2);
68 for(i = 0; i < s->nb_block_sizes; i++)
69 ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 0);
72 s->block_align= avctx->bit_rate*(int64_t)s->frame_len / (avctx->sample_rate*8);
73 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d\n", s->block_align, avctx->bit_rate, s->frame_len, avctx->sample_rate);
74 avctx->frame_size= s->frame_len;
80 static void apply_window_and_mdct(AVCodecContext * avctx, signed short * audio, int len) {
81 WMACodecContext *s = avctx->priv_data;
82 int window_index= s->frame_len_bits - s->block_len_bits;
84 const float * win = s->windows[window_index];
85 int window_len = 1 << s->block_len_bits;
86 float n = window_len/2;
88 for (channel = 0; channel < avctx->channels; channel++) {
89 memcpy(s->output, s->frame_out[channel], sizeof(float)*window_len);
91 for (i = 0; i < len; i++, j += avctx->channels){
92 s->output[i+window_len] = audio[j] / n * win[i];
93 s->frame_out[channel][i] = audio[j] / n * win[window_len - i - 1];
95 ff_mdct_calc(&s->mdct_ctx[window_index], s->coefs[channel], s->output, s->mdct_tmp);
99 //FIXME use for decoding too
100 static void init_exp(WMACodecContext *s, int ch, int *exp_param){
103 float v, *q, max_scale, *q_end;
105 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
106 q = s->exponents[ch];
107 q_end = q + s->block_len;
110 /* XXX: use a table */
111 v = pow(10, *exp_param++ * (1.0 / 16.0));
112 max_scale= FFMAX(max_scale, v);
118 s->max_exponent[ch] = max_scale;
121 static void encode_exp_vlc(WMACodecContext *s, int ch, const int *exp_param){
126 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
127 q = s->exponents[ch];
128 q_end = q + s->block_len;
129 if (s->version == 1) {
130 last_exp= *exp_param++;
131 assert(last_exp-10 >= 0 && last_exp-10 < 32);
132 put_bits(&s->pb, 5, last_exp - 10);
137 int exp = *exp_param++;
138 int code = exp - last_exp + 60;
139 assert(code >= 0 && code < 120);
140 put_bits(&s->pb, ff_wma_scale_huffbits[code], ff_wma_scale_huffcodes[code]);
141 /* XXX: use a table */
147 static int encode_block(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], int total_gain){
148 int v, bsize, ch, coef_nb_bits, parse_exponents;
150 int nb_coefs[MAX_CHANNELS];
151 static const int fixed_exp[25]={20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20};
153 //FIXME remove duplication relative to decoder
154 if (s->use_variable_block_len) {
155 assert(0); //FIXME not implemented
157 /* fixed block len */
158 s->next_block_len_bits = s->frame_len_bits;
159 s->prev_block_len_bits = s->frame_len_bits;
160 s->block_len_bits = s->frame_len_bits;
163 s->block_len = 1 << s->block_len_bits;
164 // assert((s->block_pos + s->block_len) <= s->frame_len);
165 bsize = s->frame_len_bits - s->block_len_bits;
168 v = s->coefs_end[bsize] - s->coefs_start;
169 for(ch = 0; ch < s->nb_channels; ch++)
172 int n4 = s->block_len / 2;
173 mdct_norm = 1.0 / (float)n4;
174 if (s->version == 1) {
175 mdct_norm *= sqrt(n4);
179 if (s->nb_channels == 2) {
180 put_bits(&s->pb, 1, s->ms_stereo= 1);
183 for(ch = 0; ch < s->nb_channels; ch++) {
184 if (s->channel_coded[ch]= 1) { //FIXME
185 init_exp(s, ch, fixed_exp);
189 for(ch = 0; ch < s->nb_channels; ch++) {
190 if (s->channel_coded[ch]) {
192 float *coefs, *exponents, mult;
195 coefs1 = s->coefs1[ch];
196 exponents = s->exponents[ch];
197 mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
199 coefs = src_coefs[ch];
200 if (s->use_noise_coding && 0) {
201 assert(0); //FIXME not implemented
203 coefs += s->coefs_start;
205 for(i = 0;i < n; i++){
206 double t= *coefs++ / (exponents[i] * mult);
207 if(t<-32768 || t>32767)
210 coefs1[i] = lrint(t);
217 for(ch = 0; ch < s->nb_channels; ch++) {
218 int a = s->channel_coded[ch];
219 put_bits(&s->pb, 1, a);
226 for(v= total_gain-1; v>=127; v-= 127)
227 put_bits(&s->pb, 7, 127);
228 put_bits(&s->pb, 7, v);
230 coef_nb_bits= ff_wma_total_gain_to_bits(total_gain);
232 if (s->use_noise_coding) {
233 for(ch = 0; ch < s->nb_channels; ch++) {
234 if (s->channel_coded[ch]) {
236 n = s->exponent_high_sizes[bsize];
238 put_bits(&s->pb, 1, s->high_band_coded[ch][i]= 0);
240 nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
247 if (s->block_len_bits != s->frame_len_bits) {
248 put_bits(&s->pb, 1, parse_exponents);
251 if (parse_exponents) {
252 for(ch = 0; ch < s->nb_channels; ch++) {
253 if (s->channel_coded[ch]) {
254 if (s->use_exp_vlc) {
255 encode_exp_vlc(s, ch, fixed_exp);
257 assert(0); //FIXME not implemented
258 // encode_exp_lsp(s, ch);
263 assert(0); //FIXME not implemented
266 for(ch = 0; ch < s->nb_channels; ch++) {
267 if (s->channel_coded[ch]) {
270 tindex = (ch == 1 && s->ms_stereo);
271 ptr = &s->coefs1[ch][0];
272 eptr = ptr + nb_coefs[ch];
275 for(;ptr < eptr; ptr++){
278 int abs_level= FFABS(level);
280 if(abs_level <= s->coef_vlcs[tindex]->max_level){
281 if(run < s->coef_vlcs[tindex]->levels[abs_level-1])
282 code= run + s->int_table[tindex][abs_level-1];
285 assert(code < s->coef_vlcs[tindex]->n);
286 put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[code], s->coef_vlcs[tindex]->huffcodes[code]);
289 if(1<<coef_nb_bits <= abs_level)
292 put_bits(&s->pb, coef_nb_bits, abs_level);
293 put_bits(&s->pb, s->frame_len_bits, run);
295 put_bits(&s->pb, 1, level < 0); //FIXME the sign is fliped somewhere
302 put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[1], s->coef_vlcs[tindex]->huffcodes[1]);
304 if (s->version == 1 && s->nb_channels >= 2) {
305 align_put_bits(&s->pb);
311 static int encode_frame(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], uint8_t *buf, int buf_size, int total_gain){
312 init_put_bits(&s->pb, buf, buf_size);
314 if (s->use_bit_reservoir) {
315 assert(0);//FIXME not implemented
317 if(encode_block(s, src_coefs, total_gain) < 0)
321 align_put_bits(&s->pb);
323 return put_bits_count(&s->pb)/8 - s->block_align;
326 static int encode_superframe(AVCodecContext *avctx,
327 unsigned char *buf, int buf_size, void *data){
328 WMACodecContext *s = avctx->priv_data;
329 short *samples = data;
330 int i, total_gain, best;
332 s->block_len_bits= s->frame_len_bits; //required by non variable block len
333 s->block_len = 1 << s->block_len_bits;
335 apply_window_and_mdct(avctx, samples, avctx->frame_size);
341 for(i = 0; i < s->block_len; i++) {
342 a = s->coefs[0][i]*0.5;
343 b = s->coefs[1][i]*0.5;
344 s->coefs[0][i] = a + b;
345 s->coefs[1][i] = a - b;
352 int error= encode_frame(s, s->coefs, buf, buf_size, total_gain-i);
358 best= encode_frame(s, s->coefs, buf, buf_size, total_gain);
360 int scoreL= encode_frame(s, s->coefs, buf, buf_size, total_gain-i);
361 int scoreR= encode_frame(s, s->coefs, buf, buf_size, total_gain+i);
362 av_log(NULL, AV_LOG_ERROR, "%d %d %d (%d)\n", scoreL, best, scoreR, total_gain);
363 if(scoreL < FFMIN(best, scoreR)){
366 }else if(scoreR < best){
373 encode_frame(s, s->coefs, buf, buf_size, total_gain);
374 assert((put_bits_count(&s->pb) & 7) == 0);
375 i= s->block_align - (put_bits_count(&s->pb)+7)/8;
378 put_bits(&s->pb, 8, 'N');
380 flush_put_bits(&s->pb);
381 return pbBufPtr(&s->pb) - s->pb.buf;
384 AVCodec wmav1_encoder =
389 sizeof(WMACodecContext),
395 AVCodec wmav2_encoder =
400 sizeof(WMACodecContext),