FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/wmaenc.c
Date: 2025-07-16 17:38:15
Exec Total Coverage
Lines: 208 238 87.4%
Functions: 7 7 100.0%
Branches: 99 144 68.8%
Line Branch Exec Source
1 /*
2 * WMA compatible encoder
3 * Copyright (c) 2007 Michael Niedermayer
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 #include "config_components.h"
23
24 #include "libavutil/attributes.h"
25 #include "libavutil/ffmath.h"
26 #include "libavutil/mem.h"
27
28 #include "avcodec.h"
29 #include "codec_internal.h"
30 #include "encode.h"
31 #include "wma.h"
32 #include "libavutil/avassert.h"
33
34
35 2 static av_cold int encode_init(AVCodecContext *avctx)
36 {
37 2 WMACodecContext *s = avctx->priv_data;
38 int i, flags1, flags2, block_align;
39 uint8_t *extradata;
40 int ret;
41
42 2 s->avctx = avctx;
43
44
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 2 if (avctx->ch_layout.nb_channels > MAX_CHANNELS) {
45 ✗ av_log(avctx, AV_LOG_ERROR,
46 "too many channels: got %i, need %i or fewer\n",
47 avctx->ch_layout.nb_channels, MAX_CHANNELS);
48 ✗ return AVERROR(EINVAL);
49 }
50
51
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 2 if (avctx->sample_rate > 48000) {
52 ✗ av_log(avctx, AV_LOG_ERROR, "sample rate is too high: %d > 48kHz\n",
53 avctx->sample_rate);
54 ✗ return AVERROR(EINVAL);
55 }
56
57
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 2 if (avctx->bit_rate < 24 * 1000) {
58 ✗ av_log(avctx, AV_LOG_ERROR,
59 "bitrate too low: got %"PRId64", need 24000 or higher\n",
60 avctx->bit_rate);
61 ✗ return AVERROR(EINVAL);
62 }
63
64 /* extract flag info */
65 2 flags1 = 0;
66 2 flags2 = 1;
67
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 2 if (avctx->codec->id == AV_CODEC_ID_WMAV1) {
68 1 extradata = av_malloc(4);
69
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 1 if (!extradata)
70 ✗ return AVERROR(ENOMEM);
71 1 avctx->extradata_size = 4;
72 1 AV_WL16(extradata, flags1);
73 1 AV_WL16(extradata + 2, flags2);
74
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 1 } else if (avctx->codec->id == AV_CODEC_ID_WMAV2) {
75 1 extradata = av_mallocz(10);
76
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 1 if (!extradata)
77 ✗ return AVERROR(ENOMEM);
78 1 avctx->extradata_size = 10;
79 1 AV_WL32(extradata, flags1);
80 1 AV_WL16(extradata + 4, flags2);
81 } else {
82 ✗ av_unreachable("This function is only used with WMAV1/2 encoders");
83 }
84 2 avctx->extradata = extradata;
85 2 s->use_exp_vlc = flags2 & 0x0001;
86 2 s->use_bit_reservoir = flags2 & 0x0002;
87 2 s->use_variable_block_len = flags2 & 0x0004;
88
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 2 if (avctx->ch_layout.nb_channels == 2)
89 2 s->ms_stereo = 1;
90
91
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 2 if ((ret = ff_wma_init(avctx, flags2)) < 0)
92 ✗ return ret;
93
94 /* init MDCT */
95
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 4 for (i = 0; i < s->nb_block_sizes; i++) {
96 2 float scale = 1.0f;
97 2 ret = av_tx_init(&s->mdct_ctx[i], &s->mdct_fn[i], AV_TX_FLOAT_MDCT,
98 2 0, 1 << (s->frame_len_bits - i), &scale, 0);
99
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 2 if (ret < 0)
100 ✗ return ret;
101 }
102
103 2 block_align = avctx->bit_rate * (int64_t) s->frame_len /
104 2 (avctx->sample_rate * 8);
105 2 block_align = FFMIN(block_align, MAX_CODED_SUPERFRAME_SIZE);
106 2 avctx->block_align = block_align;
107 2 avctx->frame_size = avctx->initial_padding = s->frame_len;
108
109 2 return 0;
110 }
111
112 410 static int apply_window_and_mdct(AVCodecContext *avctx, const AVFrame *frame)
113 {
114 410 WMACodecContext *s = avctx->priv_data;
115 410 const float *const *audio = (const float *const *) frame->extended_data;
116 410 int len = frame->nb_samples;
117 410 int window_index = s->frame_len_bits - s->block_len_bits;
118 410 AVTXContext *mdct = s->mdct_ctx[window_index];
119 410 av_tx_fn mdct_fn = s->mdct_fn[window_index];
120 int ch;
121 410 const float *win = s->windows[window_index];
122 410 int window_len = 1 << s->block_len_bits;
123 410 float n = 2.0 * 32768.0 / window_len;
124
125
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 1230 for (ch = 0; ch < avctx->ch_layout.nb_channels; ch++) {
126 820 memcpy(s->output, s->frame_out[ch], window_len * sizeof(*s->output));
127 820 s->fdsp->vector_fmul_scalar(s->frame_out[ch], audio[ch], n, len);
128 820 s->fdsp->vector_fmul_reverse(&s->output[window_len], s->frame_out[ch],
129 win, len);
130 820 s->fdsp->vector_fmul(s->frame_out[ch], s->frame_out[ch], win, len);
131 820 mdct_fn(mdct, s->coefs[ch], s->output, sizeof(float));
132
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 820 if (!isfinite(s->coefs[ch][0])) {
133 ✗ av_log(avctx, AV_LOG_ERROR, "Input contains NaN/+-Inf\n");
134 ✗ return AVERROR(EINVAL);
135 }
136 }
137
138 410 return 0;
139 }
140
141 // FIXME use for decoding too
142 6128 static void init_exp(WMACodecContext *s, int ch, const int *exp_param)
143 {
144 int n;
145 const uint16_t *ptr;
146 float v, *q, max_scale, *q_end;
147
148 6128 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
149 6128 q = s->exponents[ch];
150 6128 q_end = q + s->block_len;
151 6128 max_scale = 0;
152
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 159328 while (q < q_end) {
153 /* XXX: use a table */
154 153200 v = ff_exp10(*exp_param++ *(1.0 / 16.0));
155
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 153200 max_scale = FFMAX(max_scale, v);
156 153200 n = *ptr++;
157 do {
158 12550144 *q++ = v;
159
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 12550144 } while (--n);
160 }
161 6128 s->max_exponent[ch] = max_scale;
162 6128 }
163
164 6128 static void encode_exp_vlc(WMACodecContext *s, int ch, const int *exp_param)
165 {
166 int last_exp;
167 const uint16_t *ptr;
168 float *q, *q_end;
169
170 6128 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
171 6128 q = s->exponents[ch];
172 6128 q_end = q + s->block_len;
173
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 6128 if (s->version == 1) {
174 3064 last_exp = *exp_param++;
175
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 3064 av_assert0(last_exp - 10 >= 0 && last_exp - 10 < 32);
176 3064 put_bits(&s->pb, 5, last_exp - 10);
177 3064 q += *ptr++;
178 } else
179 3064 last_exp = 36;
180
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 156264 while (q < q_end) {
181 150136 int exp = *exp_param++;
182 150136 int code = exp - last_exp + 60;
183 av_assert1(code >= 0 && code < 120);
184 150136 put_bits(&s->pb, ff_aac_scalefactor_bits[code],
185 150136 ff_aac_scalefactor_code[code]);
186 /* XXX: use a table */
187 150136 q += *ptr++;
188 150136 last_exp = exp;
189 }
190 6128 }
191
192 3064 static int encode_block(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE],
193 int total_gain)
194 {
195 3064 int channels = s->avctx->ch_layout.nb_channels;
196 int v, bsize, ch, coef_nb_bits, parse_exponents;
197 float mdct_norm;
198 int nb_coefs[MAX_CHANNELS];
199 static const int fixed_exp[25] = {
200 20, 20, 20, 20, 20,
201 20, 20, 20, 20, 20,
202 20, 20, 20, 20, 20,
203 20, 20, 20, 20, 20,
204 20, 20, 20, 20, 20
205 };
206
207 // FIXME remove duplication relative to decoder
208
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 3064 if (s->use_variable_block_len) {
209 ✗ av_unreachable("use_variable_block_len unimplemented, set to 0 during init");
210 } else {
211 /* fixed block len */
212 3064 s->next_block_len_bits = s->frame_len_bits;
213 3064 s->prev_block_len_bits = s->frame_len_bits;
214 3064 s->block_len_bits = s->frame_len_bits;
215 }
216
217 3064 s->block_len = 1 << s->block_len_bits;
218 // av_assert0((s->block_pos + s->block_len) <= s->frame_len);
219 3064 bsize = s->frame_len_bits - s->block_len_bits;
220
221 // FIXME factor
222 3064 v = s->coefs_end[bsize] - s->coefs_start;
223
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 9192 for (ch = 0; ch < channels; ch++)
224 6128 nb_coefs[ch] = v;
225 {
226 3064 int n4 = s->block_len / 2;
227 3064 mdct_norm = 1.0 / (float) n4;
228
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 3064 if (s->version == 1)
229 1532 mdct_norm *= sqrt(n4);
230 }
231
232
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 3064 if (channels == 2)
233 3064 put_bits(&s->pb, 1, !!s->ms_stereo);
234
235
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 9192 for (ch = 0; ch < channels; ch++) {
236 // FIXME only set channel_coded when needed, instead of always
237 6128 s->channel_coded[ch] = 1;
238
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 6128 if (s->channel_coded[ch])
239 6128 init_exp(s, ch, fixed_exp);
240 }
241
242
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 9192 for (ch = 0; ch < channels; ch++) {
243
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 6128 if (s->channel_coded[ch]) {
244 WMACoef *coefs1;
245 float *coefs, *exponents, mult;
246 int i, n;
247
248 6128 coefs1 = s->coefs1[ch];
249 6128 exponents = s->exponents[ch];
250 6128 mult = ff_exp10(total_gain * 0.05) / s->max_exponent[ch];
251 6128 mult *= mdct_norm;
252 6128 coefs = src_coefs[ch];
253 if (s->use_noise_coding && 0) {
254 av_assert0(0); // FIXME not implemented
255 } else {
256 6128 coefs += s->coefs_start;
257 6128 n = nb_coefs[ch];
258
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 11419528 for (i = 0; i < n; i++) {
259 11413400 double t = *coefs++ / (exponents[i] * mult);
260
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 11413400 if (t < -32768 || t > 32767)
261 ✗ return -1;
262
263 11413400 coefs1[i] = lrint(t);
264 }
265 }
266 }
267 }
268
269 3064 v = 0;
270
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 9192 for (ch = 0; ch < channels; ch++) {
271 6128 int a = s->channel_coded[ch];
272 6128 put_bits(&s->pb, 1, a);
273 6128 v |= a;
274 }
275
276
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 3064 if (!v)
277 ✗ return 1;
278
279
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 3064 for (v = total_gain - 1; v >= 127; v -= 127)
280 ✗ put_bits(&s->pb, 7, 127);
281 3064 put_bits(&s->pb, 7, v);
282
283 3064 coef_nb_bits = ff_wma_total_gain_to_bits(total_gain);
284
285
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 3064 if (s->use_noise_coding) {
286 ✗ for (ch = 0; ch < channels; ch++) {
287 ✗ if (s->channel_coded[ch]) {
288 int i, n;
289 ✗ n = s->exponent_high_sizes[bsize];
290 ✗ for (i = 0; i < n; i++) {
291 ✗ put_bits(&s->pb, 1, s->high_band_coded[ch][i] = 0);
292 if (0)
293 nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
294 }
295 }
296 }
297 }
298
299 3064 parse_exponents = 1;
300
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 3064 if (s->block_len_bits != s->frame_len_bits)
301 ✗ put_bits(&s->pb, 1, parse_exponents);
302
303
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 3064 if (parse_exponents) {
304
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 9192 for (ch = 0; ch < channels; ch++) {
305
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 6128 if (s->channel_coded[ch]) {
306
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 6128 if (s->use_exp_vlc) {
307 6128 encode_exp_vlc(s, ch, fixed_exp);
308 } else {
309 ✗ av_unreachable("use_exp_vlc always set to 1 during init");
310 // FIXME not implemented
311 // encode_exp_lsp(s, ch);
312 }
313 }
314 }
315 } else
316 ✗ av_assert0(0); // FIXME not implemented
317
318
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 8435 for (ch = 0; ch < channels; ch++) {
319
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 5755 if (s->channel_coded[ch]) {
320 int run, tindex;
321 WMACoef *ptr, *eptr;
322
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 5755 tindex = (ch == 1 && s->ms_stereo);
323 5755 ptr = &s->coefs1[ch][0];
324 5755 eptr = ptr + nb_coefs[ch];
325
326 5755 run = 0;
327
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328
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 10007446 if (*ptr) {
329 2918406 int level = *ptr;
330 2918406 int abs_level = FFABS(level);
331 2918406 int code = 0;
332
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 2918406 if (abs_level <= s->coef_vlcs[tindex]->max_level)
333
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 2889049 if (run < s->coef_vlcs[tindex]->levels[abs_level - 1])
334 2884295 code = run + s->int_table[tindex][abs_level - 1];
335
336 av_assert2(code < s->coef_vlcs[tindex]->n);
337 2918406 put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[code],
338 2918406 s->coef_vlcs[tindex]->huffcodes[code]);
339
340
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 2918406 if (code == 0) {
341
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 34111 if (1 << coef_nb_bits <= abs_level)
342 384 return -1;
343
344 33727 put_bits(&s->pb, coef_nb_bits, abs_level);
345 33727 put_bits(&s->pb, s->frame_len_bits, run);
346 }
347 // FIXME the sign is flipped somewhere
348 2918022 put_bits(&s->pb, 1, level < 0);
349 2918022 run = 0;
350 } else
351 7089040 run++;
352 }
353
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 5371 if (run)
354 5152 put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[1],
355 5152 s->coef_vlcs[tindex]->huffcodes[1]);
356 }
357
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 5371 if (s->version == 1 && channels >= 2)
358 2803 align_put_bits(&s->pb);
359 }
360 2680 return 0;
361 }
362
363 3064 static int encode_frame(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE],
364 uint8_t *buf, int buf_size, int total_gain)
365 {
366 3064 init_put_bits(&s->pb, buf, buf_size);
367
368
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 3064 if (s->use_bit_reservoir)
369 ✗ av_unreachable("use_bit_reseroir unimplemented, set to 0 during init");
370
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 3064 else if (encode_block(s, src_coefs, total_gain) < 0)
371 384 return INT_MAX;
372
373 2680 align_put_bits(&s->pb);
374
375 2680 return put_bits_count(&s->pb) / 8 - s->avctx->block_align;
376 }
377
378 410 static int encode_superframe(AVCodecContext *avctx, AVPacket *avpkt,
379 const AVFrame *frame, int *got_packet_ptr)
380 {
381 410 WMACodecContext *s = avctx->priv_data;
382 int i, total_gain, ret, error;
383
384 410 s->block_len_bits = s->frame_len_bits; // required by non variable block len
385 410 s->block_len = 1 << s->block_len_bits;
386
387 410 ret = apply_window_and_mdct(avctx, frame);
388
389
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 410 if (ret < 0)
390 ✗ return ret;
391
392
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 410 if (s->ms_stereo) {
393 float a, b;
394 int i;
395
396
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 840090 for (i = 0; i < s->block_len; i++) {
397 839680 a = s->coefs[0][i] * 0.5;
398 839680 b = s->coefs[1][i] * 0.5;
399 839680 s->coefs[0][i] = a + b;
400 839680 s->coefs[1][i] = a - b;
401 }
402 }
403
404
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 410 if ((ret = ff_alloc_packet(avctx, avpkt, 2 * MAX_CODED_SUPERFRAME_SIZE)) < 0)
405 ✗ return ret;
406
407 410 total_gain = 128;
408
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 3280 for (i = 64; i; i >>= 1) {
409 2870 error = encode_frame(s, s->coefs, avpkt->data, avpkt->size,
410 total_gain - i);
411
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 2870 if (error <= 0)
412 1331 total_gain -= i;
413 }
414
415
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 604 while(total_gain <= 128 && error > 0)
416 194 error = encode_frame(s, s->coefs, avpkt->data, avpkt->size, total_gain++);
417
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 410 if (error > 0) {
418 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid input data or requested bitrate too low, cannot encode\n");
419 ✗ return AVERROR(EINVAL);
420 }
421
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 410 av_assert0((put_bits_count(&s->pb) & 7) == 0);
422 410 i = avctx->block_align - put_bytes_count(&s->pb, 0);
423
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 410 av_assert0(i>=0);
424
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 22160 while(i--)
425 21750 put_bits(&s->pb, 8, 'N');
426
427 410 flush_put_bits(&s->pb);
428
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 410 av_assert0(put_bytes_output(&s->pb) == avctx->block_align);
429
430
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 410 if (frame->pts != AV_NOPTS_VALUE)
431 410 avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding);
432
433 410 avpkt->size = avctx->block_align;
434 410 *got_packet_ptr = 1;
435 410 return 0;
436 }
437
438 #if CONFIG_WMAV1_ENCODER
439 const FFCodec ff_wmav1_encoder = {
440 .p.name = "wmav1",
441 CODEC_LONG_NAME("Windows Media Audio 1"),
442 .p.type = AVMEDIA_TYPE_AUDIO,
443 .p.id = AV_CODEC_ID_WMAV1,
444 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
445 .priv_data_size = sizeof(WMACodecContext),
446 .init = encode_init,
447 FF_CODEC_ENCODE_CB(encode_superframe),
448 .close = ff_wma_end,
449 CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_FLTP),
450 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
451 };
452 #endif
453 #if CONFIG_WMAV2_ENCODER
454 const FFCodec ff_wmav2_encoder = {
455 .p.name = "wmav2",
456 CODEC_LONG_NAME("Windows Media Audio 2"),
457 .p.type = AVMEDIA_TYPE_AUDIO,
458 .p.id = AV_CODEC_ID_WMAV2,
459 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
460 .priv_data_size = sizeof(WMACodecContext),
461 .init = encode_init,
462 FF_CODEC_ENCODE_CB(encode_superframe),
463 .close = ff_wma_end,
464 CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_FLTP),
465 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
466 };
467 #endif
468