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
25 #include "libavutil/avassert.h"
28 static int encode_init(AVCodecContext * avctx){
29 WMACodecContext *s = avctx->priv_data;
30 int i, flags1, flags2, block_align;
35 if(avctx->channels > MAX_CHANNELS) {
36 av_log(avctx, AV_LOG_ERROR, "too many channels: got %i, need %i or fewer\n",
37 avctx->channels, MAX_CHANNELS);
38 return AVERROR(EINVAL);
41 if (avctx->sample_rate > 48000) {
42 av_log(avctx, AV_LOG_ERROR, "sample rate is too high: %d > 48kHz\n",
44 return AVERROR(EINVAL);
47 if(avctx->bit_rate < 24*1000) {
48 av_log(avctx, AV_LOG_ERROR, "bitrate too low: got %i, need 24000 or higher\n",
50 return AVERROR(EINVAL);
53 #if FF_API_OLD_ENCODE_AUDIO
54 if (!(avctx->coded_frame = avcodec_alloc_frame()))
55 return AVERROR(ENOMEM);
58 /* extract flag infos */
61 if (avctx->codec->id == AV_CODEC_ID_WMAV1) {
62 extradata= av_malloc(4);
63 avctx->extradata_size= 4;
64 AV_WL16(extradata, flags1);
65 AV_WL16(extradata+2, flags2);
66 } else if (avctx->codec->id == AV_CODEC_ID_WMAV2) {
67 extradata= av_mallocz(10);
68 avctx->extradata_size= 10;
69 AV_WL32(extradata, flags1);
70 AV_WL16(extradata+4, flags2);
73 avctx->extradata= extradata;
74 s->use_exp_vlc = flags2 & 0x0001;
75 s->use_bit_reservoir = flags2 & 0x0002;
76 s->use_variable_block_len = flags2 & 0x0004;
77 if (avctx->channels == 2)
80 ff_wma_init(avctx, flags2);
83 for(i = 0; i < s->nb_block_sizes; i++)
84 ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 0, 1.0);
86 block_align = avctx->bit_rate * (int64_t)s->frame_len /
87 (avctx->sample_rate * 8);
88 block_align = FFMIN(block_align, MAX_CODED_SUPERFRAME_SIZE);
89 avctx->block_align = block_align;
91 avctx->frame_size = avctx->delay = s->frame_len;
97 static void apply_window_and_mdct(AVCodecContext * avctx, const AVFrame *frame)
99 WMACodecContext *s = avctx->priv_data;
100 float **audio = (float **)frame->extended_data;
101 int len = frame->nb_samples;
102 int window_index= s->frame_len_bits - s->block_len_bits;
103 FFTContext *mdct = &s->mdct_ctx[window_index];
105 const float * win = s->windows[window_index];
106 int window_len = 1 << s->block_len_bits;
107 float n = 2.0 * 32768.0 / window_len;
109 for (ch = 0; ch < avctx->channels; ch++) {
110 memcpy(s->output, s->frame_out[ch], window_len * sizeof(*s->output));
111 s->fdsp.vector_fmul_scalar(s->frame_out[ch], audio[ch], n, len);
112 s->fdsp.vector_fmul_reverse(&s->output[window_len], s->frame_out[ch], win, len);
113 s->fdsp.vector_fmul(s->frame_out[ch], s->frame_out[ch], win, len);
114 mdct->mdct_calc(mdct, s->coefs[ch], s->output);
118 //FIXME use for decoding too
119 static void init_exp(WMACodecContext *s, int ch, const int *exp_param){
122 float v, *q, max_scale, *q_end;
124 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
125 q = s->exponents[ch];
126 q_end = q + s->block_len;
129 /* XXX: use a table */
130 v = pow(10, *exp_param++ * (1.0 / 16.0));
131 max_scale= FFMAX(max_scale, v);
137 s->max_exponent[ch] = max_scale;
140 static void encode_exp_vlc(WMACodecContext *s, int ch, const int *exp_param){
145 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
146 q = s->exponents[ch];
147 q_end = q + s->block_len;
148 if (s->version == 1) {
149 last_exp= *exp_param++;
150 av_assert0(last_exp-10 >= 0 && last_exp-10 < 32);
151 put_bits(&s->pb, 5, last_exp - 10);
156 int exp = *exp_param++;
157 int code = exp - last_exp + 60;
158 av_assert1(code >= 0 && code < 120);
159 put_bits(&s->pb, ff_aac_scalefactor_bits[code], ff_aac_scalefactor_code[code]);
160 /* XXX: use a table */
166 static int encode_block(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], int total_gain){
167 int v, bsize, ch, coef_nb_bits, parse_exponents;
169 int nb_coefs[MAX_CHANNELS];
170 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};
172 //FIXME remove duplication relative to decoder
173 if (s->use_variable_block_len) {
174 av_assert0(0); //FIXME not implemented
176 /* fixed block len */
177 s->next_block_len_bits = s->frame_len_bits;
178 s->prev_block_len_bits = s->frame_len_bits;
179 s->block_len_bits = s->frame_len_bits;
182 s->block_len = 1 << s->block_len_bits;
183 // assert((s->block_pos + s->block_len) <= s->frame_len);
184 bsize = s->frame_len_bits - s->block_len_bits;
187 v = s->coefs_end[bsize] - s->coefs_start;
188 for (ch = 0; ch < s->avctx->channels; ch++)
191 int n4 = s->block_len / 2;
192 mdct_norm = 1.0 / (float)n4;
193 if (s->version == 1) {
194 mdct_norm *= sqrt(n4);
198 if (s->avctx->channels == 2) {
199 put_bits(&s->pb, 1, !!s->ms_stereo);
202 for (ch = 0; ch < s->avctx->channels; ch++) {
203 s->channel_coded[ch] = 1; //FIXME only set channel_coded when needed, instead of always
204 if (s->channel_coded[ch]) {
205 init_exp(s, ch, fixed_exp);
209 for (ch = 0; ch < s->avctx->channels; ch++) {
210 if (s->channel_coded[ch]) {
212 float *coefs, *exponents, mult;
215 coefs1 = s->coefs1[ch];
216 exponents = s->exponents[ch];
217 mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
219 coefs = src_coefs[ch];
220 if (s->use_noise_coding && 0) {
221 av_assert0(0); //FIXME not implemented
223 coefs += s->coefs_start;
225 for(i = 0;i < n; i++){
226 double t= *coefs++ / (exponents[i] * mult);
227 if(t<-32768 || t>32767)
230 coefs1[i] = lrint(t);
237 for (ch = 0; ch < s->avctx->channels; ch++) {
238 int a = s->channel_coded[ch];
239 put_bits(&s->pb, 1, a);
246 for(v= total_gain-1; v>=127; v-= 127)
247 put_bits(&s->pb, 7, 127);
248 put_bits(&s->pb, 7, v);
250 coef_nb_bits= ff_wma_total_gain_to_bits(total_gain);
252 if (s->use_noise_coding) {
253 for (ch = 0; ch < s->avctx->channels; ch++) {
254 if (s->channel_coded[ch]) {
256 n = s->exponent_high_sizes[bsize];
258 put_bits(&s->pb, 1, s->high_band_coded[ch][i]= 0);
260 nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
267 if (s->block_len_bits != s->frame_len_bits) {
268 put_bits(&s->pb, 1, parse_exponents);
271 if (parse_exponents) {
272 for (ch = 0; ch < s->avctx->channels; ch++) {
273 if (s->channel_coded[ch]) {
274 if (s->use_exp_vlc) {
275 encode_exp_vlc(s, ch, fixed_exp);
277 av_assert0(0); //FIXME not implemented
278 // encode_exp_lsp(s, ch);
283 av_assert0(0); //FIXME not implemented
286 for (ch = 0; ch < s->avctx->channels; ch++) {
287 if (s->channel_coded[ch]) {
290 tindex = (ch == 1 && s->ms_stereo);
291 ptr = &s->coefs1[ch][0];
292 eptr = ptr + nb_coefs[ch];
295 for(;ptr < eptr; ptr++){
298 int abs_level= FFABS(level);
300 if(abs_level <= s->coef_vlcs[tindex]->max_level){
301 if(run < s->coef_vlcs[tindex]->levels[abs_level-1])
302 code= run + s->int_table[tindex][abs_level-1];
305 av_assert2(code < s->coef_vlcs[tindex]->n);
306 put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[code], s->coef_vlcs[tindex]->huffcodes[code]);
309 if(1<<coef_nb_bits <= abs_level)
312 put_bits(&s->pb, coef_nb_bits, abs_level);
313 put_bits(&s->pb, s->frame_len_bits, run);
315 put_bits(&s->pb, 1, level < 0); //FIXME the sign is fliped somewhere
322 put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[1], s->coef_vlcs[tindex]->huffcodes[1]);
324 if (s->version == 1 && s->avctx->channels >= 2) {
325 avpriv_align_put_bits(&s->pb);
331 static int encode_frame(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], uint8_t *buf, int buf_size, int total_gain){
332 init_put_bits(&s->pb, buf, buf_size);
334 if (s->use_bit_reservoir) {
335 av_assert0(0);//FIXME not implemented
337 if(encode_block(s, src_coefs, total_gain) < 0)
341 avpriv_align_put_bits(&s->pb);
343 return put_bits_count(&s->pb) / 8 - s->avctx->block_align;
346 static int encode_superframe(AVCodecContext *avctx, AVPacket *avpkt,
347 const AVFrame *frame, int *got_packet_ptr)
349 WMACodecContext *s = avctx->priv_data;
350 int i, total_gain, ret, error;
352 s->block_len_bits= s->frame_len_bits; //required by non variable block len
353 s->block_len = 1 << s->block_len_bits;
355 apply_window_and_mdct(avctx, frame);
361 for(i = 0; i < s->block_len; i++) {
362 a = s->coefs[0][i]*0.5;
363 b = s->coefs[1][i]*0.5;
364 s->coefs[0][i] = a + b;
365 s->coefs[1][i] = a - b;
369 if ((ret = ff_alloc_packet2(avctx, avpkt, 2 * MAX_CODED_SUPERFRAME_SIZE)))
374 error = encode_frame(s, s->coefs, avpkt->data, avpkt->size,
380 while(total_gain <= 128 && error > 0)
381 error = encode_frame(s, s->coefs, avpkt->data, avpkt->size, total_gain++);
382 av_assert0((put_bits_count(&s->pb) & 7) == 0);
383 i= avctx->block_align - (put_bits_count(&s->pb)+7)/8;
386 put_bits(&s->pb, 8, 'N');
388 flush_put_bits(&s->pb);
389 av_assert0(put_bits_ptr(&s->pb) - s->pb.buf == avctx->block_align);
391 if (frame->pts != AV_NOPTS_VALUE)
392 avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->delay);
394 avpkt->size = avctx->block_align;
399 #if CONFIG_WMAV1_ENCODER
400 AVCodec ff_wmav1_encoder = {
402 .type = AVMEDIA_TYPE_AUDIO,
403 .id = AV_CODEC_ID_WMAV1,
404 .priv_data_size = sizeof(WMACodecContext),
406 .encode2 = encode_superframe,
408 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
409 AV_SAMPLE_FMT_NONE },
410 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
413 #if CONFIG_WMAV2_ENCODER
414 AVCodec ff_wmav2_encoder = {
416 .type = AVMEDIA_TYPE_AUDIO,
417 .id = AV_CODEC_ID_WMAV2,
418 .priv_data_size = sizeof(WMACodecContext),
420 .encode2 = encode_superframe,
422 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
423 AV_SAMPLE_FMT_NONE },
424 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),