2 * WMA compatible encoder
3 * Copyright (c) 2007 Michael Niedermayer
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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"
32 static av_cold int encode_init(AVCodecContext *avctx)
34 WMACodecContext *s = avctx->priv_data;
35 int i, flags1, flags2, block_align;
40 if (avctx->channels > MAX_CHANNELS) {
41 av_log(avctx, AV_LOG_ERROR,
42 "too many channels: got %i, need %i or fewer",
43 avctx->channels, MAX_CHANNELS);
44 return AVERROR(EINVAL);
47 if (avctx->sample_rate > 48000) {
48 av_log(avctx, AV_LOG_ERROR, "sample rate is too high: %d > 48kHz",
50 return AVERROR(EINVAL);
53 if (avctx->bit_rate < 24 * 1000) {
54 av_log(avctx, AV_LOG_ERROR,
55 "bitrate too low: got %i, need 24000 or higher\n",
57 return AVERROR(EINVAL);
60 /* extract flag info */
63 if (avctx->codec->id == AV_CODEC_ID_WMAV1) {
64 extradata = av_malloc(4);
66 return AVERROR(ENOMEM);
67 avctx->extradata_size = 4;
68 AV_WL16(extradata, flags1);
69 AV_WL16(extradata + 2, flags2);
70 } else if (avctx->codec->id == AV_CODEC_ID_WMAV2) {
71 extradata = av_mallocz(10);
73 return AVERROR(ENOMEM);
74 avctx->extradata_size = 10;
75 AV_WL32(extradata, flags1);
76 AV_WL16(extradata + 4, flags2);
80 avctx->extradata = extradata;
81 s->use_exp_vlc = flags2 & 0x0001;
82 s->use_bit_reservoir = flags2 & 0x0002;
83 s->use_variable_block_len = flags2 & 0x0004;
84 if (avctx->channels == 2)
87 ff_wma_init(avctx, flags2);
90 for (i = 0; i < s->nb_block_sizes; i++)
91 ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 0, 1.0);
93 block_align = avctx->bit_rate * (int64_t) s->frame_len /
94 (avctx->sample_rate * 8);
95 block_align = FFMIN(block_align, MAX_CODED_SUPERFRAME_SIZE);
96 avctx->block_align = block_align;
97 avctx->bit_rate = avctx->block_align * 8LL * avctx->sample_rate /
99 avctx->frame_size = avctx->initial_padding = s->frame_len;
104 static void apply_window_and_mdct(AVCodecContext *avctx, const AVFrame *frame)
106 WMACodecContext *s = avctx->priv_data;
107 float **audio = (float **) frame->extended_data;
108 int len = frame->nb_samples;
109 int window_index = s->frame_len_bits - s->block_len_bits;
110 FFTContext *mdct = &s->mdct_ctx[window_index];
112 const float *win = s->windows[window_index];
113 int window_len = 1 << s->block_len_bits;
114 float n = 2.0 * 32768.0 / window_len;
116 for (ch = 0; ch < avctx->channels; ch++) {
117 memcpy(s->output, s->frame_out[ch], window_len * sizeof(*s->output));
118 s->fdsp.vector_fmul_scalar(s->frame_out[ch], audio[ch], n, len);
119 s->fdsp.vector_fmul_reverse(&s->output[window_len], s->frame_out[ch],
121 s->fdsp.vector_fmul(s->frame_out[ch], s->frame_out[ch], win, len);
122 mdct->mdct_calc(mdct, s->coefs[ch], s->output);
126 // FIXME use for decoding too
127 static void init_exp(WMACodecContext *s, int ch, const int *exp_param)
131 float v, *q, max_scale, *q_end;
133 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
134 q = s->exponents[ch];
135 q_end = q + s->block_len;
138 /* XXX: use a table */
139 v = pow(10, *exp_param++ *(1.0 / 16.0));
140 max_scale = FFMAX(max_scale, v);
146 s->max_exponent[ch] = max_scale;
149 static void encode_exp_vlc(WMACodecContext *s, int ch, const int *exp_param)
155 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
156 q = s->exponents[ch];
157 q_end = q + s->block_len;
158 if (s->version == 1) {
159 last_exp = *exp_param++;
160 assert(last_exp - 10 >= 0 && last_exp - 10 < 32);
161 put_bits(&s->pb, 5, last_exp - 10);
166 int exp = *exp_param++;
167 int code = exp - last_exp + 60;
168 assert(code >= 0 && code < 120);
169 put_bits(&s->pb, ff_aac_scalefactor_bits[code],
170 ff_aac_scalefactor_code[code]);
171 /* XXX: use a table */
177 static int encode_block(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE],
180 int v, bsize, ch, coef_nb_bits, parse_exponents;
182 int nb_coefs[MAX_CHANNELS];
183 static const int fixed_exp[25] = {
191 // FIXME remove duplication relative to decoder
192 if (s->use_variable_block_len) {
193 assert(0); // FIXME not implemented
195 /* fixed block len */
196 s->next_block_len_bits = s->frame_len_bits;
197 s->prev_block_len_bits = s->frame_len_bits;
198 s->block_len_bits = s->frame_len_bits;
201 s->block_len = 1 << s->block_len_bits;
202 // assert((s->block_pos + s->block_len) <= s->frame_len);
203 bsize = s->frame_len_bits - s->block_len_bits;
206 v = s->coefs_end[bsize] - s->coefs_start;
207 for (ch = 0; ch < s->avctx->channels; ch++)
210 int n4 = s->block_len / 2;
211 mdct_norm = 1.0 / (float) n4;
213 mdct_norm *= sqrt(n4);
216 if (s->avctx->channels == 2)
217 put_bits(&s->pb, 1, !!s->ms_stereo);
219 for (ch = 0; ch < s->avctx->channels; ch++) {
220 // FIXME only set channel_coded when needed, instead of always
221 s->channel_coded[ch] = 1;
222 if (s->channel_coded[ch])
223 init_exp(s, ch, fixed_exp);
226 for (ch = 0; ch < s->avctx->channels; ch++) {
227 if (s->channel_coded[ch]) {
229 float *coefs, *exponents, mult;
232 coefs1 = s->coefs1[ch];
233 exponents = s->exponents[ch];
234 mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
236 coefs = src_coefs[ch];
237 if (s->use_noise_coding && 0) {
238 assert(0); // FIXME not implemented
240 coefs += s->coefs_start;
242 for (i = 0; i < n; i++) {
243 double t = *coefs++ / (exponents[i] * mult);
244 if (t < -32768 || t > 32767)
247 coefs1[i] = lrint(t);
254 for (ch = 0; ch < s->avctx->channels; ch++) {
255 int a = s->channel_coded[ch];
256 put_bits(&s->pb, 1, a);
263 for (v = total_gain - 1; v >= 127; v -= 127)
264 put_bits(&s->pb, 7, 127);
265 put_bits(&s->pb, 7, v);
267 coef_nb_bits = ff_wma_total_gain_to_bits(total_gain);
269 if (s->use_noise_coding) {
270 for (ch = 0; ch < s->avctx->channels; ch++) {
271 if (s->channel_coded[ch]) {
273 n = s->exponent_high_sizes[bsize];
274 for (i = 0; i < n; i++) {
275 put_bits(&s->pb, 1, s->high_band_coded[ch][i] = 0);
277 nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
284 if (s->block_len_bits != s->frame_len_bits)
285 put_bits(&s->pb, 1, parse_exponents);
287 if (parse_exponents) {
288 for (ch = 0; ch < s->avctx->channels; ch++) {
289 if (s->channel_coded[ch]) {
290 if (s->use_exp_vlc) {
291 encode_exp_vlc(s, ch, fixed_exp);
293 assert(0); // FIXME not implemented
294 // encode_exp_lsp(s, ch);
299 assert(0); // FIXME not implemented
301 for (ch = 0; ch < s->avctx->channels; ch++) {
302 if (s->channel_coded[ch]) {
305 tindex = (ch == 1 && s->ms_stereo);
306 ptr = &s->coefs1[ch][0];
307 eptr = ptr + nb_coefs[ch];
310 for (; ptr < eptr; ptr++) {
313 int abs_level = FFABS(level);
315 if (abs_level <= s->coef_vlcs[tindex]->max_level)
316 if (run < s->coef_vlcs[tindex]->levels[abs_level - 1])
317 code = run + s->int_table[tindex][abs_level - 1];
319 assert(code < s->coef_vlcs[tindex]->n);
320 put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[code],
321 s->coef_vlcs[tindex]->huffcodes[code]);
324 if (1 << coef_nb_bits <= abs_level)
327 put_bits(&s->pb, coef_nb_bits, abs_level);
328 put_bits(&s->pb, s->frame_len_bits, run);
330 // FIXME the sign is flipped somewhere
331 put_bits(&s->pb, 1, level < 0);
337 put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[1],
338 s->coef_vlcs[tindex]->huffcodes[1]);
340 if (s->version == 1 && s->avctx->channels >= 2)
341 avpriv_align_put_bits(&s->pb);
346 static int encode_frame(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE],
347 uint8_t *buf, int buf_size, int total_gain)
349 init_put_bits(&s->pb, buf, buf_size);
351 if (s->use_bit_reservoir)
352 assert(0); // FIXME not implemented
353 else if (encode_block(s, src_coefs, total_gain) < 0)
356 avpriv_align_put_bits(&s->pb);
358 return put_bits_count(&s->pb) / 8 - s->avctx->block_align;
361 static int encode_superframe(AVCodecContext *avctx, AVPacket *avpkt,
362 const AVFrame *frame, int *got_packet_ptr)
364 WMACodecContext *s = avctx->priv_data;
365 int i, total_gain, ret;
367 s->block_len_bits = s->frame_len_bits; // required by non variable block len
368 s->block_len = 1 << s->block_len_bits;
370 apply_window_and_mdct(avctx, frame);
376 for (i = 0; i < s->block_len; i++) {
377 a = s->coefs[0][i] * 0.5;
378 b = s->coefs[1][i] * 0.5;
379 s->coefs[0][i] = a + b;
380 s->coefs[1][i] = a - b;
384 if ((ret = ff_alloc_packet(avpkt, 2 * MAX_CODED_SUPERFRAME_SIZE))) {
385 av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
390 for (i = 64; i; i >>= 1) {
391 int error = encode_frame(s, s->coefs, avpkt->data, avpkt->size,
397 if ((i = encode_frame(s, s->coefs, avpkt->data, avpkt->size, total_gain)) >= 0) {
398 av_log(avctx, AV_LOG_ERROR, "required frame size too large. please "
399 "use a higher bit rate.\n");
400 return AVERROR(EINVAL);
402 assert((put_bits_count(&s->pb) & 7) == 0);
404 put_bits(&s->pb, 8, 'N');
406 flush_put_bits(&s->pb);
408 if (frame->pts != AV_NOPTS_VALUE)
409 avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding);
411 avpkt->size = avctx->block_align;
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 AVCodec ff_wmav2_encoder = {
431 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
432 .type = AVMEDIA_TYPE_AUDIO,
433 .id = AV_CODEC_ID_WMAV2,
434 .priv_data_size = sizeof(WMACodecContext),
436 .encode2 = encode_superframe,
438 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
439 AV_SAMPLE_FMT_NONE },