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
22 #include "libavutil/attributes.h"
27 #include "libavutil/avassert.h"
30 static av_cold int encode_init(AVCodecContext *avctx)
32 WMACodecContext *s = avctx->priv_data;
33 int i, flags1, flags2, block_align;
38 if (avctx->channels > MAX_CHANNELS) {
39 av_log(avctx, AV_LOG_ERROR,
40 "too many channels: got %i, need %i or fewer\n",
41 avctx->channels, MAX_CHANNELS);
42 return AVERROR(EINVAL);
45 if (avctx->sample_rate > 48000) {
46 av_log(avctx, AV_LOG_ERROR, "sample rate is too high: %d > 48kHz\n",
48 return AVERROR(EINVAL);
51 if (avctx->bit_rate < 24 * 1000) {
52 av_log(avctx, AV_LOG_ERROR,
53 "bitrate too low: got %i, need 24000 or higher\n",
55 return AVERROR(EINVAL);
58 /* extract flag infos */
61 if (avctx->codec->id == AV_CODEC_ID_WMAV1) {
62 extradata = av_malloc(4);
64 return AVERROR(ENOMEM);
65 avctx->extradata_size = 4;
66 AV_WL16(extradata, flags1);
67 AV_WL16(extradata + 2, flags2);
68 } else if (avctx->codec->id == AV_CODEC_ID_WMAV2) {
69 extradata = av_mallocz(10);
71 return AVERROR(ENOMEM);
72 avctx->extradata_size = 10;
73 AV_WL32(extradata, flags1);
74 AV_WL16(extradata + 4, flags2);
78 avctx->extradata = extradata;
79 s->use_exp_vlc = flags2 & 0x0001;
80 s->use_bit_reservoir = flags2 & 0x0002;
81 s->use_variable_block_len = flags2 & 0x0004;
82 if (avctx->channels == 2)
85 ff_wma_init(avctx, flags2);
88 for (i = 0; i < s->nb_block_sizes; i++)
89 ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 0, 1.0);
91 block_align = avctx->bit_rate * (int64_t) s->frame_len /
92 (avctx->sample_rate * 8);
93 block_align = FFMIN(block_align, MAX_CODED_SUPERFRAME_SIZE);
94 avctx->block_align = block_align;
95 avctx->frame_size = avctx->initial_padding = s->frame_len;
100 static void apply_window_and_mdct(AVCodecContext *avctx, const AVFrame *frame)
102 WMACodecContext *s = avctx->priv_data;
103 float **audio = (float **) frame->extended_data;
104 int len = frame->nb_samples;
105 int window_index = s->frame_len_bits - s->block_len_bits;
106 FFTContext *mdct = &s->mdct_ctx[window_index];
108 const float *win = s->windows[window_index];
109 int window_len = 1 << s->block_len_bits;
110 float n = 2.0 * 32768.0 / window_len;
112 for (ch = 0; ch < avctx->channels; ch++) {
113 memcpy(s->output, s->frame_out[ch], window_len * sizeof(*s->output));
114 s->fdsp->vector_fmul_scalar(s->frame_out[ch], audio[ch], n, len);
115 s->fdsp->vector_fmul_reverse(&s->output[window_len], s->frame_out[ch],
117 s->fdsp->vector_fmul(s->frame_out[ch], s->frame_out[ch], win, len);
118 mdct->mdct_calc(mdct, s->coefs[ch], s->output);
122 // FIXME use for decoding too
123 static void init_exp(WMACodecContext *s, int ch, const int *exp_param)
127 float v, *q, max_scale, *q_end;
129 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
130 q = s->exponents[ch];
131 q_end = q + s->block_len;
134 /* XXX: use a table */
135 v = pow(10, *exp_param++ *(1.0 / 16.0));
136 max_scale = FFMAX(max_scale, v);
142 s->max_exponent[ch] = max_scale;
145 static void encode_exp_vlc(WMACodecContext *s, int ch, const int *exp_param)
151 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
152 q = s->exponents[ch];
153 q_end = q + s->block_len;
154 if (s->version == 1) {
155 last_exp = *exp_param++;
156 av_assert0(last_exp - 10 >= 0 && last_exp - 10 < 32);
157 put_bits(&s->pb, 5, last_exp - 10);
162 int exp = *exp_param++;
163 int code = exp - last_exp + 60;
164 av_assert1(code >= 0 && code < 120);
165 put_bits(&s->pb, ff_aac_scalefactor_bits[code],
166 ff_aac_scalefactor_code[code]);
167 /* XXX: use a table */
173 static int encode_block(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE],
176 int v, bsize, ch, coef_nb_bits, parse_exponents;
178 int nb_coefs[MAX_CHANNELS];
179 static const int fixed_exp[25] = {
187 // FIXME remove duplication relative to decoder
188 if (s->use_variable_block_len) {
189 av_assert0(0); // FIXME not implemented
191 /* fixed block len */
192 s->next_block_len_bits = s->frame_len_bits;
193 s->prev_block_len_bits = s->frame_len_bits;
194 s->block_len_bits = s->frame_len_bits;
197 s->block_len = 1 << s->block_len_bits;
198 // av_assert0((s->block_pos + s->block_len) <= s->frame_len);
199 bsize = s->frame_len_bits - s->block_len_bits;
202 v = s->coefs_end[bsize] - s->coefs_start;
203 for (ch = 0; ch < s->avctx->channels; ch++)
206 int n4 = s->block_len / 2;
207 mdct_norm = 1.0 / (float) n4;
209 mdct_norm *= sqrt(n4);
212 if (s->avctx->channels == 2)
213 put_bits(&s->pb, 1, !!s->ms_stereo);
215 for (ch = 0; ch < s->avctx->channels; ch++) {
216 // FIXME only set channel_coded when needed, instead of always
217 s->channel_coded[ch] = 1;
218 if (s->channel_coded[ch])
219 init_exp(s, ch, fixed_exp);
222 for (ch = 0; ch < s->avctx->channels; ch++) {
223 if (s->channel_coded[ch]) {
225 float *coefs, *exponents, mult;
228 coefs1 = s->coefs1[ch];
229 exponents = s->exponents[ch];
230 mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
232 coefs = src_coefs[ch];
233 if (s->use_noise_coding && 0) {
234 av_assert0(0); // FIXME not implemented
236 coefs += s->coefs_start;
238 for (i = 0; i < n; i++) {
239 double t = *coefs++ / (exponents[i] * mult);
240 if (t < -32768 || t > 32767)
243 coefs1[i] = lrint(t);
250 for (ch = 0; ch < s->avctx->channels; ch++) {
251 int a = s->channel_coded[ch];
252 put_bits(&s->pb, 1, a);
259 for (v = total_gain - 1; v >= 127; v -= 127)
260 put_bits(&s->pb, 7, 127);
261 put_bits(&s->pb, 7, v);
263 coef_nb_bits = ff_wma_total_gain_to_bits(total_gain);
265 if (s->use_noise_coding) {
266 for (ch = 0; ch < s->avctx->channels; ch++) {
267 if (s->channel_coded[ch]) {
269 n = s->exponent_high_sizes[bsize];
270 for (i = 0; i < n; i++) {
271 put_bits(&s->pb, 1, s->high_band_coded[ch][i] = 0);
273 nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
280 if (s->block_len_bits != s->frame_len_bits)
281 put_bits(&s->pb, 1, parse_exponents);
283 if (parse_exponents) {
284 for (ch = 0; ch < s->avctx->channels; ch++) {
285 if (s->channel_coded[ch]) {
286 if (s->use_exp_vlc) {
287 encode_exp_vlc(s, ch, fixed_exp);
289 av_assert0(0); // FIXME not implemented
290 // encode_exp_lsp(s, ch);
295 av_assert0(0); // FIXME not implemented
297 for (ch = 0; ch < s->avctx->channels; ch++) {
298 if (s->channel_coded[ch]) {
301 tindex = (ch == 1 && s->ms_stereo);
302 ptr = &s->coefs1[ch][0];
303 eptr = ptr + nb_coefs[ch];
306 for (; ptr < eptr; ptr++) {
309 int abs_level = FFABS(level);
311 if (abs_level <= s->coef_vlcs[tindex]->max_level)
312 if (run < s->coef_vlcs[tindex]->levels[abs_level - 1])
313 code = run + s->int_table[tindex][abs_level - 1];
315 av_assert2(code < s->coef_vlcs[tindex]->n);
316 put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[code],
317 s->coef_vlcs[tindex]->huffcodes[code]);
320 if (1 << coef_nb_bits <= abs_level)
323 put_bits(&s->pb, coef_nb_bits, abs_level);
324 put_bits(&s->pb, s->frame_len_bits, run);
326 // FIXME the sign is flipped somewhere
327 put_bits(&s->pb, 1, level < 0);
333 put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[1],
334 s->coef_vlcs[tindex]->huffcodes[1]);
336 if (s->version == 1 && s->avctx->channels >= 2)
337 avpriv_align_put_bits(&s->pb);
342 static int encode_frame(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE],
343 uint8_t *buf, int buf_size, int total_gain)
345 init_put_bits(&s->pb, buf, buf_size);
347 if (s->use_bit_reservoir)
348 av_assert0(0); // FIXME not implemented
349 else if (encode_block(s, src_coefs, total_gain) < 0)
352 avpriv_align_put_bits(&s->pb);
354 return put_bits_count(&s->pb) / 8 - s->avctx->block_align;
357 static int encode_superframe(AVCodecContext *avctx, AVPacket *avpkt,
358 const AVFrame *frame, int *got_packet_ptr)
360 WMACodecContext *s = avctx->priv_data;
361 int i, total_gain, ret, error;
363 s->block_len_bits = s->frame_len_bits; // required by non variable block len
364 s->block_len = 1 << s->block_len_bits;
366 apply_window_and_mdct(avctx, frame);
372 for (i = 0; i < s->block_len; i++) {
373 a = s->coefs[0][i] * 0.5;
374 b = s->coefs[1][i] * 0.5;
375 s->coefs[0][i] = a + b;
376 s->coefs[1][i] = a - b;
380 if ((ret = ff_alloc_packet2(avctx, avpkt, 2 * MAX_CODED_SUPERFRAME_SIZE)) < 0)
384 for (i = 64; i; i >>= 1) {
385 error = encode_frame(s, s->coefs, avpkt->data, avpkt->size,
391 while(total_gain <= 128 && error > 0)
392 error = encode_frame(s, s->coefs, avpkt->data, avpkt->size, total_gain++);
394 av_log(avctx, AV_LOG_ERROR, "Invalid input data or requested bitrate too low, cannot encode\n");
396 return AVERROR(EINVAL);
398 av_assert0((put_bits_count(&s->pb) & 7) == 0);
399 i= avctx->block_align - (put_bits_count(&s->pb)+7)/8;
402 put_bits(&s->pb, 8, 'N');
404 flush_put_bits(&s->pb);
405 av_assert0(put_bits_ptr(&s->pb) - s->pb.buf == avctx->block_align);
407 if (frame->pts != AV_NOPTS_VALUE)
408 avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding);
410 avpkt->size = avctx->block_align;
415 #if CONFIG_WMAV1_ENCODER
416 AVCodec ff_wmav1_encoder = {
418 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
419 .type = AVMEDIA_TYPE_AUDIO,
420 .id = AV_CODEC_ID_WMAV1,
421 .priv_data_size = sizeof(WMACodecContext),
423 .encode2 = encode_superframe,
425 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
426 AV_SAMPLE_FMT_NONE },
429 #if CONFIG_WMAV2_ENCODER
430 AVCodec ff_wmav2_encoder = {
432 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
433 .type = AVMEDIA_TYPE_AUDIO,
434 .id = AV_CODEC_ID_WMAV2,
435 .priv_data_size = sizeof(WMACodecContext),
437 .encode2 = encode_superframe,
439 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
440 AV_SAMPLE_FMT_NONE },