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"
23 #include "libavutil/ffmath.h"
28 #include "libavutil/avassert.h"
31 static av_cold int encode_init(AVCodecContext *avctx)
33 WMACodecContext *s = avctx->priv_data;
34 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\n",
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\n",
50 return AVERROR(EINVAL);
53 if (avctx->bit_rate < 24 * 1000) {
54 av_log(avctx, AV_LOG_ERROR,
55 "bitrate too low: got %"PRId64", need 24000 or higher\n",
56 (int64_t)avctx->bit_rate);
57 return AVERROR(EINVAL);
60 /* extract flag infos */
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 if ((ret = ff_wma_init(avctx, flags2)) < 0)
91 for (i = 0; i < s->nb_block_sizes; i++)
92 ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 0, 1.0);
94 block_align = avctx->bit_rate * (int64_t) s->frame_len /
95 (avctx->sample_rate * 8);
96 block_align = FFMIN(block_align, MAX_CODED_SUPERFRAME_SIZE);
97 avctx->block_align = block_align;
98 avctx->frame_size = avctx->initial_padding = s->frame_len;
103 static int apply_window_and_mdct(AVCodecContext *avctx, const AVFrame *frame)
105 WMACodecContext *s = avctx->priv_data;
106 float **audio = (float **) frame->extended_data;
107 int len = frame->nb_samples;
108 int window_index = s->frame_len_bits - s->block_len_bits;
109 FFTContext *mdct = &s->mdct_ctx[window_index];
111 const float *win = s->windows[window_index];
112 int window_len = 1 << s->block_len_bits;
113 float n = 2.0 * 32768.0 / window_len;
115 for (ch = 0; ch < avctx->channels; ch++) {
116 memcpy(s->output, s->frame_out[ch], window_len * sizeof(*s->output));
117 s->fdsp->vector_fmul_scalar(s->frame_out[ch], audio[ch], n, len);
118 s->fdsp->vector_fmul_reverse(&s->output[window_len], s->frame_out[ch],
120 s->fdsp->vector_fmul(s->frame_out[ch], s->frame_out[ch], win, len);
121 mdct->mdct_calc(mdct, s->coefs[ch], s->output);
122 if (!isfinite(s->coefs[ch][0])) {
123 av_log(avctx, AV_LOG_ERROR, "Input contains NaN/+-Inf\n");
124 return AVERROR(EINVAL);
131 // FIXME use for decoding too
132 static void init_exp(WMACodecContext *s, int ch, const int *exp_param)
136 float v, *q, max_scale, *q_end;
138 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
139 q = s->exponents[ch];
140 q_end = q + s->block_len;
143 /* XXX: use a table */
144 v = ff_exp10(*exp_param++ *(1.0 / 16.0));
145 max_scale = FFMAX(max_scale, v);
151 s->max_exponent[ch] = max_scale;
154 static void encode_exp_vlc(WMACodecContext *s, int ch, const int *exp_param)
160 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
161 q = s->exponents[ch];
162 q_end = q + s->block_len;
163 if (s->version == 1) {
164 last_exp = *exp_param++;
165 av_assert0(last_exp - 10 >= 0 && last_exp - 10 < 32);
166 put_bits(&s->pb, 5, last_exp - 10);
171 int exp = *exp_param++;
172 int code = exp - last_exp + 60;
173 av_assert1(code >= 0 && code < 120);
174 put_bits(&s->pb, ff_aac_scalefactor_bits[code],
175 ff_aac_scalefactor_code[code]);
176 /* XXX: use a table */
182 static int encode_block(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE],
185 int v, bsize, ch, coef_nb_bits, parse_exponents;
187 int nb_coefs[MAX_CHANNELS];
188 static const int fixed_exp[25] = {
196 // FIXME remove duplication relative to decoder
197 if (s->use_variable_block_len) {
198 av_assert0(0); // FIXME not implemented
200 /* fixed block len */
201 s->next_block_len_bits = s->frame_len_bits;
202 s->prev_block_len_bits = s->frame_len_bits;
203 s->block_len_bits = s->frame_len_bits;
206 s->block_len = 1 << s->block_len_bits;
207 // av_assert0((s->block_pos + s->block_len) <= s->frame_len);
208 bsize = s->frame_len_bits - s->block_len_bits;
211 v = s->coefs_end[bsize] - s->coefs_start;
212 for (ch = 0; ch < s->avctx->channels; ch++)
215 int n4 = s->block_len / 2;
216 mdct_norm = 1.0 / (float) n4;
218 mdct_norm *= sqrt(n4);
221 if (s->avctx->channels == 2)
222 put_bits(&s->pb, 1, !!s->ms_stereo);
224 for (ch = 0; ch < s->avctx->channels; ch++) {
225 // FIXME only set channel_coded when needed, instead of always
226 s->channel_coded[ch] = 1;
227 if (s->channel_coded[ch])
228 init_exp(s, ch, fixed_exp);
231 for (ch = 0; ch < s->avctx->channels; ch++) {
232 if (s->channel_coded[ch]) {
234 float *coefs, *exponents, mult;
237 coefs1 = s->coefs1[ch];
238 exponents = s->exponents[ch];
239 mult = ff_exp10(total_gain * 0.05) / s->max_exponent[ch];
241 coefs = src_coefs[ch];
242 if (s->use_noise_coding && 0) {
243 av_assert0(0); // FIXME not implemented
245 coefs += s->coefs_start;
247 for (i = 0; i < n; i++) {
248 double t = *coefs++ / (exponents[i] * mult);
249 if (t < -32768 || t > 32767)
252 coefs1[i] = lrint(t);
259 for (ch = 0; ch < s->avctx->channels; ch++) {
260 int a = s->channel_coded[ch];
261 put_bits(&s->pb, 1, a);
268 for (v = total_gain - 1; v >= 127; v -= 127)
269 put_bits(&s->pb, 7, 127);
270 put_bits(&s->pb, 7, v);
272 coef_nb_bits = ff_wma_total_gain_to_bits(total_gain);
274 if (s->use_noise_coding) {
275 for (ch = 0; ch < s->avctx->channels; ch++) {
276 if (s->channel_coded[ch]) {
278 n = s->exponent_high_sizes[bsize];
279 for (i = 0; i < n; i++) {
280 put_bits(&s->pb, 1, s->high_band_coded[ch][i] = 0);
282 nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
289 if (s->block_len_bits != s->frame_len_bits)
290 put_bits(&s->pb, 1, parse_exponents);
292 if (parse_exponents) {
293 for (ch = 0; ch < s->avctx->channels; ch++) {
294 if (s->channel_coded[ch]) {
295 if (s->use_exp_vlc) {
296 encode_exp_vlc(s, ch, fixed_exp);
298 av_assert0(0); // FIXME not implemented
299 // encode_exp_lsp(s, ch);
304 av_assert0(0); // FIXME not implemented
306 for (ch = 0; ch < s->avctx->channels; ch++) {
307 if (s->channel_coded[ch]) {
310 tindex = (ch == 1 && s->ms_stereo);
311 ptr = &s->coefs1[ch][0];
312 eptr = ptr + nb_coefs[ch];
315 for (; ptr < eptr; ptr++) {
318 int abs_level = FFABS(level);
320 if (abs_level <= s->coef_vlcs[tindex]->max_level)
321 if (run < s->coef_vlcs[tindex]->levels[abs_level - 1])
322 code = run + s->int_table[tindex][abs_level - 1];
324 av_assert2(code < s->coef_vlcs[tindex]->n);
325 put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[code],
326 s->coef_vlcs[tindex]->huffcodes[code]);
329 if (1 << coef_nb_bits <= abs_level)
332 put_bits(&s->pb, coef_nb_bits, abs_level);
333 put_bits(&s->pb, s->frame_len_bits, run);
335 // FIXME the sign is flipped somewhere
336 put_bits(&s->pb, 1, level < 0);
342 put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[1],
343 s->coef_vlcs[tindex]->huffcodes[1]);
345 if (s->version == 1 && s->avctx->channels >= 2)
346 avpriv_align_put_bits(&s->pb);
351 static int encode_frame(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE],
352 uint8_t *buf, int buf_size, int total_gain)
354 init_put_bits(&s->pb, buf, buf_size);
356 if (s->use_bit_reservoir)
357 av_assert0(0); // FIXME not implemented
358 else if (encode_block(s, src_coefs, total_gain) < 0)
361 avpriv_align_put_bits(&s->pb);
363 return put_bits_count(&s->pb) / 8 - s->avctx->block_align;
366 static int encode_superframe(AVCodecContext *avctx, AVPacket *avpkt,
367 const AVFrame *frame, int *got_packet_ptr)
369 WMACodecContext *s = avctx->priv_data;
370 int i, total_gain, ret, error;
372 s->block_len_bits = s->frame_len_bits; // required by non variable block len
373 s->block_len = 1 << s->block_len_bits;
375 ret = apply_window_and_mdct(avctx, frame);
384 for (i = 0; i < s->block_len; i++) {
385 a = s->coefs[0][i] * 0.5;
386 b = s->coefs[1][i] * 0.5;
387 s->coefs[0][i] = a + b;
388 s->coefs[1][i] = a - b;
392 if ((ret = ff_alloc_packet2(avctx, avpkt, 2 * MAX_CODED_SUPERFRAME_SIZE, 0)) < 0)
396 for (i = 64; i; i >>= 1) {
397 error = encode_frame(s, s->coefs, avpkt->data, avpkt->size,
403 while(total_gain <= 128 && error > 0)
404 error = encode_frame(s, s->coefs, avpkt->data, avpkt->size, total_gain++);
406 av_log(avctx, AV_LOG_ERROR, "Invalid input data or requested bitrate too low, cannot encode\n");
408 return AVERROR(EINVAL);
410 av_assert0((put_bits_count(&s->pb) & 7) == 0);
411 i= avctx->block_align - (put_bits_count(&s->pb)+7)/8;
414 put_bits(&s->pb, 8, 'N');
416 flush_put_bits(&s->pb);
417 av_assert0(put_bits_ptr(&s->pb) - s->pb.buf == avctx->block_align);
419 if (frame->pts != AV_NOPTS_VALUE)
420 avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding);
422 avpkt->size = avctx->block_align;
427 #if CONFIG_WMAV1_ENCODER
428 AVCodec ff_wmav1_encoder = {
430 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
431 .type = AVMEDIA_TYPE_AUDIO,
432 .id = AV_CODEC_ID_WMAV1,
433 .priv_data_size = sizeof(WMACodecContext),
435 .encode2 = encode_superframe,
437 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
438 AV_SAMPLE_FMT_NONE },
441 #if CONFIG_WMAV2_ENCODER
442 AVCodec ff_wmav2_encoder = {
444 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
445 .type = AVMEDIA_TYPE_AUDIO,
446 .id = AV_CODEC_ID_WMAV2,
447 .priv_data_size = sizeof(WMACodecContext),
449 .encode2 = encode_superframe,
451 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
452 AV_SAMPLE_FMT_NONE },