lavc: use designated initialisers for all codecs.
[libav.git] / libavcodec / binkaudio.c
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 Libav.
7 *
8 * Libav 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 * Libav 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 Libav; 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 "avcodec.h"
32 #define ALT_BITSTREAM_READER_LE
33 #include "get_bits.h"
34 #include "dsputil.h"
35 #include "dct.h"
36 #include "rdft.h"
37 #include "fmtconvert.h"
38 #include "libavutil/intfloat_readwrite.h"
39
40 extern const uint16_t ff_wma_critical_freqs[25];
41
42 #define MAX_CHANNELS 2
43 #define BINK_BLOCK_MAX_SIZE (MAX_CHANNELS << 11)
44
45 typedef struct {
46 GetBitContext gb;
47 DSPContext dsp;
48 FmtConvertContext fmt_conv;
49 int version_b; ///< Bink version 'b'
50 int first;
51 int channels;
52 int frame_len; ///< transform size (samples)
53 int overlap_len; ///< overlap size (samples)
54 int block_size;
55 int num_bands;
56 unsigned int *bands;
57 float root;
58 DECLARE_ALIGNED(32, FFTSample, coeffs)[BINK_BLOCK_MAX_SIZE];
59 DECLARE_ALIGNED(16, short, previous)[BINK_BLOCK_MAX_SIZE / 16]; ///< coeffs from previous audio block
60 float *coeffs_ptr[MAX_CHANNELS]; ///< pointers to the coeffs arrays for float_to_int16_interleave
61 union {
62 RDFTContext rdft;
63 DCTContext dct;
64 } trans;
65 } BinkAudioContext;
66
67
68 static av_cold int decode_init(AVCodecContext *avctx)
69 {
70 BinkAudioContext *s = avctx->priv_data;
71 int sample_rate = avctx->sample_rate;
72 int sample_rate_half;
73 int i;
74 int frame_len_bits;
75
76 dsputil_init(&s->dsp, avctx);
77 ff_fmt_convert_init(&s->fmt_conv, avctx);
78
79 /* determine frame length */
80 if (avctx->sample_rate < 22050) {
81 frame_len_bits = 9;
82 } else if (avctx->sample_rate < 44100) {
83 frame_len_bits = 10;
84 } else {
85 frame_len_bits = 11;
86 }
87
88 if (avctx->channels > MAX_CHANNELS) {
89 av_log(avctx, AV_LOG_ERROR, "too many channels: %d\n", avctx->channels);
90 return -1;
91 }
92
93 s->version_b = avctx->extradata && avctx->extradata[3] == 'b';
94
95 if (avctx->codec->id == CODEC_ID_BINKAUDIO_RDFT) {
96 // audio is already interleaved for the RDFT format variant
97 sample_rate *= avctx->channels;
98 s->channels = 1;
99 if (!s->version_b)
100 frame_len_bits += av_log2(avctx->channels);
101 } else {
102 s->channels = avctx->channels;
103 }
104
105 s->frame_len = 1 << frame_len_bits;
106 s->overlap_len = s->frame_len / 16;
107 s->block_size = (s->frame_len - s->overlap_len) * s->channels;
108 sample_rate_half = (sample_rate + 1) / 2;
109 s->root = 2.0 / sqrt(s->frame_len);
110
111 /* calculate number of bands */
112 for (s->num_bands = 1; s->num_bands < 25; s->num_bands++)
113 if (sample_rate_half <= ff_wma_critical_freqs[s->num_bands - 1])
114 break;
115
116 s->bands = av_malloc((s->num_bands + 1) * sizeof(*s->bands));
117 if (!s->bands)
118 return AVERROR(ENOMEM);
119
120 /* populate bands data */
121 s->bands[0] = 2;
122 for (i = 1; i < s->num_bands; i++)
123 s->bands[i] = (ff_wma_critical_freqs[i - 1] * s->frame_len / sample_rate_half) & ~1;
124 s->bands[s->num_bands] = s->frame_len;
125
126 s->first = 1;
127 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
128
129 for (i = 0; i < s->channels; i++)
130 s->coeffs_ptr[i] = s->coeffs + i * s->frame_len;
131
132 if (CONFIG_BINKAUDIO_RDFT_DECODER && avctx->codec->id == CODEC_ID_BINKAUDIO_RDFT)
133 ff_rdft_init(&s->trans.rdft, frame_len_bits, DFT_C2R);
134 else if (CONFIG_BINKAUDIO_DCT_DECODER)
135 ff_dct_init(&s->trans.dct, frame_len_bits, DCT_III);
136 else
137 return -1;
138
139 return 0;
140 }
141
142 static float get_float(GetBitContext *gb)
143 {
144 int power = get_bits(gb, 5);
145 float f = ldexpf(get_bits_long(gb, 23), power - 23);
146 if (get_bits1(gb))
147 f = -f;
148 return f;
149 }
150
151 static const uint8_t rle_length_tab[16] = {
152 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 32, 64
153 };
154
155 /**
156 * Decode Bink Audio block
157 * @param[out] out Output buffer (must contain s->block_size elements)
158 */
159 static void decode_block(BinkAudioContext *s, short *out, int use_dct)
160 {
161 int ch, i, j, k;
162 float q, quant[25];
163 int width, coeff;
164 GetBitContext *gb = &s->gb;
165
166 if (use_dct)
167 skip_bits(gb, 2);
168
169 for (ch = 0; ch < s->channels; ch++) {
170 FFTSample *coeffs = s->coeffs_ptr[ch];
171 if (s->version_b) {
172 coeffs[0] = av_int2flt(get_bits(gb, 32)) * s->root;
173 coeffs[1] = av_int2flt(get_bits(gb, 32)) * s->root;
174 } else {
175 coeffs[0] = get_float(gb) * s->root;
176 coeffs[1] = get_float(gb) * s->root;
177 }
178
179 for (i = 0; i < s->num_bands; i++) {
180 /* constant is result of 0.066399999/log10(M_E) */
181 int value = get_bits(gb, 8);
182 quant[i] = expf(FFMIN(value, 95) * 0.15289164787221953823f) * s->root;
183 }
184
185 k = 0;
186 q = quant[0];
187
188 // parse coefficients
189 i = 2;
190 while (i < s->frame_len) {
191 if (s->version_b) {
192 j = i + 16;
193 } else if (get_bits1(gb)) {
194 j = i + rle_length_tab[get_bits(gb, 4)] * 8;
195 } else {
196 j = i + 8;
197 }
198
199 j = FFMIN(j, s->frame_len);
200
201 width = get_bits(gb, 4);
202 if (width == 0) {
203 memset(coeffs + i, 0, (j - i) * sizeof(*coeffs));
204 i = j;
205 while (s->bands[k] < i)
206 q = quant[k++];
207 } else {
208 while (i < j) {
209 if (s->bands[k] == i)
210 q = quant[k++];
211 coeff = get_bits(gb, width);
212 if (coeff) {
213 if (get_bits1(gb))
214 coeffs[i] = -q * coeff;
215 else
216 coeffs[i] = q * coeff;
217 } else {
218 coeffs[i] = 0.0f;
219 }
220 i++;
221 }
222 }
223 }
224
225 if (CONFIG_BINKAUDIO_DCT_DECODER && use_dct) {
226 coeffs[0] /= 0.5;
227 s->trans.dct.dct_calc(&s->trans.dct, coeffs);
228 s->dsp.vector_fmul_scalar(coeffs, coeffs, s->frame_len / 2, s->frame_len);
229 }
230 else if (CONFIG_BINKAUDIO_RDFT_DECODER)
231 s->trans.rdft.rdft_calc(&s->trans.rdft, coeffs);
232 }
233
234 s->fmt_conv.float_to_int16_interleave(out, (const float **)s->coeffs_ptr,
235 s->frame_len, s->channels);
236
237 if (!s->first) {
238 int count = s->overlap_len * s->channels;
239 int shift = av_log2(count);
240 for (i = 0; i < count; i++) {
241 out[i] = (s->previous[i] * (count - i) + out[i] * i) >> shift;
242 }
243 }
244
245 memcpy(s->previous, out + s->block_size,
246 s->overlap_len * s->channels * sizeof(*out));
247
248 s->first = 0;
249 }
250
251 static av_cold int decode_end(AVCodecContext *avctx)
252 {
253 BinkAudioContext * s = avctx->priv_data;
254 av_freep(&s->bands);
255 if (CONFIG_BINKAUDIO_RDFT_DECODER && avctx->codec->id == CODEC_ID_BINKAUDIO_RDFT)
256 ff_rdft_end(&s->trans.rdft);
257 else if (CONFIG_BINKAUDIO_DCT_DECODER)
258 ff_dct_end(&s->trans.dct);
259 return 0;
260 }
261
262 static void get_bits_align32(GetBitContext *s)
263 {
264 int n = (-get_bits_count(s)) & 31;
265 if (n) skip_bits(s, n);
266 }
267
268 static int decode_frame(AVCodecContext *avctx,
269 void *data, int *data_size,
270 AVPacket *avpkt)
271 {
272 BinkAudioContext *s = avctx->priv_data;
273 const uint8_t *buf = avpkt->data;
274 int buf_size = avpkt->size;
275 short *samples = data;
276 short *samples_end = (short*)((uint8_t*)data + *data_size);
277 int reported_size;
278 GetBitContext *gb = &s->gb;
279
280 init_get_bits(gb, buf, buf_size * 8);
281
282 reported_size = get_bits_long(gb, 32);
283 while (get_bits_count(gb) / 8 < buf_size &&
284 samples + s->block_size <= samples_end) {
285 decode_block(s, samples, avctx->codec->id == CODEC_ID_BINKAUDIO_DCT);
286 samples += s->block_size;
287 get_bits_align32(gb);
288 }
289
290 *data_size = FFMIN(reported_size, (uint8_t*)samples - (uint8_t*)data);
291 return buf_size;
292 }
293
294 AVCodec ff_binkaudio_rdft_decoder = {
295 .name = "binkaudio_rdft",
296 .type = AVMEDIA_TYPE_AUDIO,
297 .id = CODEC_ID_BINKAUDIO_RDFT,
298 .priv_data_size = sizeof(BinkAudioContext),
299 .init = decode_init,
300 .close = decode_end,
301 .decode = decode_frame,
302 .long_name = NULL_IF_CONFIG_SMALL("Bink Audio (RDFT)")
303 };
304
305 AVCodec ff_binkaudio_dct_decoder = {
306 .name = "binkaudio_dct",
307 .type = AVMEDIA_TYPE_AUDIO,
308 .id = CODEC_ID_BINKAUDIO_DCT,
309 .priv_data_size = sizeof(BinkAudioContext),
310 .init = decode_init,
311 .close = decode_end,
312 .decode = decode_frame,
313 .long_name = NULL_IF_CONFIG_SMALL("Bink Audio (DCT)")
314 };