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1 | /* | ||
2 | * Bink Audio decoder | ||
3 | * Copyright (c) 2007-2011 Peter Ross (pross@xvid.org) | ||
4 | * Copyright (c) 2009 Daniel Verkamp (daniel@drv.nu) | ||
5 | * | ||
6 | * This file is part of FFmpeg. | ||
7 | * | ||
8 | * FFmpeg is free software; you can redistribute it and/or | ||
9 | * modify it under the terms of the GNU Lesser General Public | ||
10 | * License as published by the Free Software Foundation; either | ||
11 | * version 2.1 of the License, or (at your option) any later version. | ||
12 | * | ||
13 | * FFmpeg is distributed in the hope that it will be useful, | ||
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
16 | * Lesser General Public License for more details. | ||
17 | * | ||
18 | * You should have received a copy of the GNU Lesser General Public | ||
19 | * License along with FFmpeg; if not, write to the Free Software | ||
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
21 | */ | ||
22 | |||
23 | /** | ||
24 | * @file | ||
25 | * Bink Audio decoder | ||
26 | * | ||
27 | * Technical details here: | ||
28 | * http://wiki.multimedia.cx/index.php?title=Bink_Audio | ||
29 | */ | ||
30 | |||
31 | #include "config_components.h" | ||
32 | |||
33 | #include "libavutil/attributes.h" | ||
34 | #include "libavutil/channel_layout.h" | ||
35 | #include "libavutil/intfloat.h" | ||
36 | #include "libavutil/mem_internal.h" | ||
37 | #include "libavutil/tx.h" | ||
38 | |||
39 | #define BITSTREAM_READER_LE | ||
40 | #include "avcodec.h" | ||
41 | #include "decode.h" | ||
42 | #include "get_bits.h" | ||
43 | #include "codec_internal.h" | ||
44 | #include "internal.h" | ||
45 | #include "wma_freqs.h" | ||
46 | |||
47 | #define MAX_DCT_CHANNELS 6 | ||
48 | #define MAX_CHANNELS 2 | ||
49 | #define BINK_BLOCK_MAX_SIZE (MAX_CHANNELS << 11) | ||
50 | |||
51 | typedef struct BinkAudioContext { | ||
52 | GetBitContext gb; | ||
53 | int version_b; ///< Bink version 'b' | ||
54 | int first; | ||
55 | int channels; | ||
56 | int ch_offset; | ||
57 | int frame_len; ///< transform size (samples) | ||
58 | int overlap_len; ///< overlap size (samples) | ||
59 | int block_size; | ||
60 | int num_bands; | ||
61 | float root; | ||
62 | unsigned int bands[26]; | ||
63 | float previous[MAX_DCT_CHANNELS][BINK_BLOCK_MAX_SIZE / 16]; ///< coeffs from previous audio block | ||
64 | float quant_table[96]; | ||
65 | AVPacket *pkt; | ||
66 | AVTXContext *tx; | ||
67 | av_tx_fn tx_fn; | ||
68 | } BinkAudioContext; | ||
69 | |||
70 | |||
71 | 6 | static av_cold int decode_init(AVCodecContext *avctx) | |
72 | { | ||
73 | 6 | BinkAudioContext *s = avctx->priv_data; | |
74 | 6 | int sample_rate = avctx->sample_rate; | |
75 | int sample_rate_half; | ||
76 | int i, ret; | ||
77 | int frame_len_bits; | ||
78 |
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6 | int max_channels = avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT ? MAX_CHANNELS : MAX_DCT_CHANNELS; |
79 | 6 | int channels = avctx->ch_layout.nb_channels; | |
80 | |||
81 | /* determine frame length */ | ||
82 |
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6 | if (avctx->sample_rate < 22050) { |
83 | ✗ | frame_len_bits = 9; | |
84 |
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6 | } else if (avctx->sample_rate < 44100) { |
85 | 2 | frame_len_bits = 10; | |
86 | } else { | ||
87 | 4 | frame_len_bits = 11; | |
88 | } | ||
89 | |||
90 |
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6 | if (channels < 1 || channels > max_channels) { |
91 | ✗ | av_log(avctx, AV_LOG_ERROR, "invalid number of channels: %d\n", channels); | |
92 | ✗ | return AVERROR_INVALIDDATA; | |
93 | } | ||
94 | 6 | av_channel_layout_uninit(&avctx->ch_layout); | |
95 | 6 | av_channel_layout_default(&avctx->ch_layout, channels); | |
96 | |||
97 |
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6 | s->version_b = avctx->extradata_size >= 4 && avctx->extradata[3] == 'b'; |
98 | |||
99 |
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6 | if (avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT) { |
100 | // audio is already interleaved for the RDFT format variant | ||
101 | 2 | avctx->sample_fmt = AV_SAMPLE_FMT_FLT; | |
102 |
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2 | if (sample_rate > INT_MAX / channels) |
103 | ✗ | return AVERROR_INVALIDDATA; | |
104 | 2 | sample_rate *= channels; | |
105 | 2 | s->channels = 1; | |
106 |
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2 | if (!s->version_b) |
107 | 2 | frame_len_bits += av_log2(channels); | |
108 | } else { | ||
109 | 4 | s->channels = channels; | |
110 | 4 | avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; | |
111 | } | ||
112 | |||
113 | 6 | s->frame_len = 1 << frame_len_bits; | |
114 | 6 | s->overlap_len = s->frame_len / 16; | |
115 | 6 | s->block_size = (s->frame_len - s->overlap_len) * FFMIN(MAX_CHANNELS, s->channels); | |
116 | 6 | sample_rate_half = (sample_rate + 1LL) / 2; | |
117 |
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6 | if (avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT) |
118 | 2 | s->root = 2.0 / (sqrt(s->frame_len) * 32768.0); | |
119 | else | ||
120 | 4 | s->root = s->frame_len / (sqrt(s->frame_len) * 32768.0); | |
121 |
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582 | for (i = 0; i < 96; i++) { |
122 | /* constant is result of 0.066399999/log10(M_E) */ | ||
123 | 576 | s->quant_table[i] = expf(i * 0.15289164787221953823f) * s->root; | |
124 | } | ||
125 | |||
126 | /* calculate number of bands */ | ||
127 |
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150 | for (s->num_bands = 1; s->num_bands < 25; s->num_bands++) |
128 |
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144 | if (sample_rate_half <= ff_wma_critical_freqs[s->num_bands - 1]) |
129 | ✗ | break; | |
130 | |||
131 | /* populate bands data */ | ||
132 | 6 | s->bands[0] = 2; | |
133 |
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150 | for (i = 1; i < s->num_bands; i++) |
134 | 144 | s->bands[i] = (ff_wma_critical_freqs[i - 1] * s->frame_len / sample_rate_half) & ~1; | |
135 | 6 | s->bands[s->num_bands] = s->frame_len; | |
136 | |||
137 | 6 | s->first = 1; | |
138 | |||
139 |
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6 | if (CONFIG_BINKAUDIO_RDFT_DECODER && avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT) { |
140 | 2 | float scale = 0.5; | |
141 | 2 | ret = av_tx_init(&s->tx, &s->tx_fn, AV_TX_FLOAT_RDFT, 1, 1 << frame_len_bits, &scale, 0); | |
142 | } else if (CONFIG_BINKAUDIO_DCT_DECODER) { | ||
143 | 4 | float scale = 1.0 / (1 << frame_len_bits); | |
144 | 4 | ret = av_tx_init(&s->tx, &s->tx_fn, AV_TX_FLOAT_DCT, 1, 1 << (frame_len_bits - 1), &scale, 0); | |
145 | } else { | ||
146 | av_assert0(0); | ||
147 | } | ||
148 |
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6 | if (ret < 0) |
149 | ✗ | return ret; | |
150 | |||
151 | 6 | s->pkt = avctx->internal->in_pkt; | |
152 | |||
153 | 6 | return 0; | |
154 | } | ||
155 | |||
156 | 582 | static float get_float(GetBitContext *gb) | |
157 | { | ||
158 | 582 | int power = get_bits(gb, 5); | |
159 | 582 | float f = ldexpf(get_bits(gb, 23), power - 23); | |
160 |
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582 | if (get_bits1(gb)) |
161 | 314 | f = -f; | |
162 | 582 | return f; | |
163 | } | ||
164 | |||
165 | static const uint8_t rle_length_tab[16] = { | ||
166 | 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 32, 64 | ||
167 | }; | ||
168 | |||
169 | /** | ||
170 | * Decode Bink Audio block | ||
171 | * @param[out] out Output buffer (must contain s->block_size elements) | ||
172 | * @return 0 on success, negative error code on failure | ||
173 | */ | ||
174 | 172 | static int decode_block(BinkAudioContext *s, float **out, int use_dct, | |
175 | int channels, int ch_offset) | ||
176 | { | ||
177 | int ch, i, j, k; | ||
178 | float q, quant[25]; | ||
179 | int width, coeff; | ||
180 | 172 | GetBitContext *gb = &s->gb; | |
181 | 172 | LOCAL_ALIGNED_32(float, coeffs, [4098]); | |
182 | |||
183 |
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172 | if (use_dct) |
184 | 119 | skip_bits(gb, 2); | |
185 | |||
186 |
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463 | for (ch = 0; ch < channels; ch++) { |
187 |
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291 | if (s->version_b) { |
188 | ✗ | if (get_bits_left(gb) < 64) | |
189 | ✗ | return AVERROR_INVALIDDATA; | |
190 | ✗ | coeffs[0] = av_int2float(get_bits_long(gb, 32)) * s->root; | |
191 | ✗ | coeffs[1] = av_int2float(get_bits_long(gb, 32)) * s->root; | |
192 | } else { | ||
193 |
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291 | if (get_bits_left(gb) < 58) |
194 | ✗ | return AVERROR_INVALIDDATA; | |
195 | 291 | coeffs[0] = get_float(gb) * s->root; | |
196 | 291 | coeffs[1] = get_float(gb) * s->root; | |
197 | } | ||
198 | |||
199 |
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291 | if (get_bits_left(gb) < s->num_bands * 8) |
200 | ✗ | return AVERROR_INVALIDDATA; | |
201 |
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7566 | for (i = 0; i < s->num_bands; i++) { |
202 | 7275 | int value = get_bits(gb, 8); | |
203 | 7275 | quant[i] = s->quant_table[FFMIN(value, 95)]; | |
204 | } | ||
205 | |||
206 | 291 | k = 0; | |
207 | 291 | q = quant[0]; | |
208 | |||
209 | // parse coefficients | ||
210 | 291 | i = 2; | |
211 |
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21612 | while (i < s->frame_len) { |
212 |
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21321 | if (s->version_b) { |
213 | ✗ | j = i + 16; | |
214 | } else { | ||
215 | 21321 | int v = get_bits1(gb); | |
216 |
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21321 | if (v) { |
217 | 7766 | v = get_bits(gb, 4); | |
218 | 7766 | j = i + rle_length_tab[v] * 8; | |
219 | } else { | ||
220 | 13555 | j = i + 8; | |
221 | } | ||
222 | } | ||
223 | |||
224 | 21321 | j = FFMIN(j, s->frame_len); | |
225 | |||
226 | 21321 | width = get_bits(gb, 4); | |
227 |
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21321 | if (width == 0) { |
228 | 827 | memset(coeffs + i, 0, (j - i) * sizeof(*coeffs)); | |
229 | 827 | i = j; | |
230 |
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1089 | while (s->bands[k] < i) |
231 | 262 | q = quant[k++]; | |
232 | } else { | ||
233 |
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371504 | while (i < j) { |
234 |
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351010 | if (s->bands[k] == i) |
235 | 7013 | q = quant[k++]; | |
236 | 351010 | coeff = get_bits(gb, width); | |
237 |
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351010 | if (coeff) { |
238 | int v; | ||
239 | 286706 | v = get_bits1(gb); | |
240 |
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286706 | if (v) |
241 | 138673 | coeffs[i] = -q * coeff; | |
242 | else | ||
243 | 148033 | coeffs[i] = q * coeff; | |
244 | } else { | ||
245 | 64304 | coeffs[i] = 0.0f; | |
246 | } | ||
247 | 351010 | i++; | |
248 | } | ||
249 | } | ||
250 | } | ||
251 | |||
252 |
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291 | if (CONFIG_BINKAUDIO_DCT_DECODER && use_dct) { |
253 | 238 | coeffs[0] /= 0.5; | |
254 | 238 | s->tx_fn(s->tx, out[ch + ch_offset], coeffs, sizeof(float)); | |
255 | } else if (CONFIG_BINKAUDIO_RDFT_DECODER) { | ||
256 |
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108544 | for (int i = 2; i < s->frame_len; i += 2) |
257 | 108491 | coeffs[i + 1] *= -1; | |
258 | |||
259 | 53 | coeffs[s->frame_len + 0] = coeffs[1]; | |
260 | 53 | coeffs[s->frame_len + 1] = coeffs[1] = 0; | |
261 | 53 | s->tx_fn(s->tx, out[ch + ch_offset], coeffs, sizeof(AVComplexFloat)); | |
262 | } | ||
263 | } | ||
264 | |||
265 |
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463 | for (ch = 0; ch < channels; ch++) { |
266 | int j; | ||
267 | 291 | int count = s->overlap_len * channels; | |
268 |
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291 | if (!s->first) { |
269 | 288 | j = ch; | |
270 |
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28704 | for (i = 0; i < s->overlap_len; i++, j += channels) |
271 | 28416 | out[ch + ch_offset][i] = (s->previous[ch + ch_offset][i] * (count - j) + | |
272 | 28416 | out[ch + ch_offset][i] * j) / count; | |
273 | } | ||
274 | 291 | memcpy(s->previous[ch + ch_offset], &out[ch + ch_offset][s->frame_len - s->overlap_len], | |
275 | 291 | s->overlap_len * sizeof(*s->previous[ch + ch_offset])); | |
276 | } | ||
277 | |||
278 | 172 | s->first = 0; | |
279 | |||
280 | 172 | return 0; | |
281 | } | ||
282 | |||
283 | 6 | static av_cold int decode_end(AVCodecContext *avctx) | |
284 | { | ||
285 | 6 | BinkAudioContext * s = avctx->priv_data; | |
286 | 6 | av_tx_uninit(&s->tx); | |
287 | 6 | return 0; | |
288 | } | ||
289 | |||
290 | 172 | static void get_bits_align32(GetBitContext *s) | |
291 | { | ||
292 | 172 | int n = (-get_bits_count(s)) & 31; | |
293 |
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172 | if (n) skip_bits(s, n); |
294 | 172 | } | |
295 | |||
296 | 266 | static int binkaudio_receive_frame(AVCodecContext *avctx, AVFrame *frame) | |
297 | { | ||
298 | 266 | BinkAudioContext *s = avctx->priv_data; | |
299 | 266 | GetBitContext *gb = &s->gb; | |
300 | int new_pkt, ret; | ||
301 | |||
302 | 266 | again: | |
303 | 266 | new_pkt = !s->pkt->data; | |
304 |
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266 | if (!s->pkt->data) { |
305 | 186 | ret = ff_decode_get_packet(avctx, s->pkt); | |
306 |
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186 | if (ret < 0) { |
307 | 94 | s->ch_offset = 0; | |
308 | 94 | return ret; | |
309 | } | ||
310 | |||
311 |
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92 | if (s->pkt->size < 4) { |
312 | ✗ | av_log(avctx, AV_LOG_ERROR, "Packet is too small\n"); | |
313 | ✗ | ret = AVERROR_INVALIDDATA; | |
314 | ✗ | goto fail; | |
315 | } | ||
316 | |||
317 | 92 | ret = init_get_bits8(gb, s->pkt->data, s->pkt->size); | |
318 |
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92 | if (ret < 0) |
319 | ✗ | goto fail; | |
320 | |||
321 | /* skip reported size */ | ||
322 | 92 | skip_bits_long(gb, 32); | |
323 | } | ||
324 | |||
325 | /* get output buffer */ | ||
326 |
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172 | if (s->ch_offset == 0) { |
327 | 172 | frame->nb_samples = s->frame_len; | |
328 |
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172 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
329 | ✗ | goto fail; | |
330 |
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172 | if (!new_pkt) |
331 | 80 | frame->pts = AV_NOPTS_VALUE; | |
332 | } | ||
333 | |||
334 |
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172 | if (decode_block(s, (float **)frame->extended_data, |
335 | 172 | avctx->codec->id == AV_CODEC_ID_BINKAUDIO_DCT, | |
336 | 172 | FFMIN(MAX_CHANNELS, s->channels - s->ch_offset), s->ch_offset)) { | |
337 | ✗ | av_log(avctx, AV_LOG_ERROR, "Incomplete packet\n"); | |
338 | ✗ | ret = AVERROR_INVALIDDATA; | |
339 | ✗ | goto fail; | |
340 | } | ||
341 | 172 | s->ch_offset += MAX_CHANNELS; | |
342 | 172 | get_bits_align32(gb); | |
343 |
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172 | if (!get_bits_left(gb)) { |
344 | 92 | memset(gb, 0, sizeof(*gb)); | |
345 | 92 | av_packet_unref(s->pkt); | |
346 | } | ||
347 |
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172 | if (s->ch_offset >= s->channels) { |
348 | 172 | s->ch_offset = 0; | |
349 | } else { | ||
350 | ✗ | goto again; | |
351 | } | ||
352 | |||
353 | 172 | frame->nb_samples = s->block_size / FFMIN(avctx->ch_layout.nb_channels, MAX_CHANNELS); | |
354 | |||
355 | 172 | return 0; | |
356 | ✗ | fail: | |
357 | ✗ | s->ch_offset = 0; | |
358 | ✗ | av_packet_unref(s->pkt); | |
359 | ✗ | return ret; | |
360 | } | ||
361 | |||
362 | ✗ | static av_cold void decode_flush(AVCodecContext *avctx) | |
363 | { | ||
364 | ✗ | BinkAudioContext *const s = avctx->priv_data; | |
365 | |||
366 | /* s->pkt coincides with avctx->internal->in_pkt | ||
367 | * and is unreferenced generically when flushing. */ | ||
368 | ✗ | s->first = 1; | |
369 | ✗ | s->ch_offset = 0; | |
370 | ✗ | } | |
371 | |||
372 | const FFCodec ff_binkaudio_rdft_decoder = { | ||
373 | .p.name = "binkaudio_rdft", | ||
374 | CODEC_LONG_NAME("Bink Audio (RDFT)"), | ||
375 | .p.type = AVMEDIA_TYPE_AUDIO, | ||
376 | .p.id = AV_CODEC_ID_BINKAUDIO_RDFT, | ||
377 | .priv_data_size = sizeof(BinkAudioContext), | ||
378 | .init = decode_init, | ||
379 | .flush = decode_flush, | ||
380 | .close = decode_end, | ||
381 | FF_CODEC_RECEIVE_FRAME_CB(binkaudio_receive_frame), | ||
382 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
383 | .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, | ||
384 | }; | ||
385 | |||
386 | const FFCodec ff_binkaudio_dct_decoder = { | ||
387 | .p.name = "binkaudio_dct", | ||
388 | CODEC_LONG_NAME("Bink Audio (DCT)"), | ||
389 | .p.type = AVMEDIA_TYPE_AUDIO, | ||
390 | .p.id = AV_CODEC_ID_BINKAUDIO_DCT, | ||
391 | .priv_data_size = sizeof(BinkAudioContext), | ||
392 | .init = decode_init, | ||
393 | .flush = decode_flush, | ||
394 | .close = decode_end, | ||
395 | FF_CODEC_RECEIVE_FRAME_CB(binkaudio_receive_frame), | ||
396 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
397 | .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, | ||
398 | }; | ||
399 |