| 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 "libavutil/channel_layout.h" |
| 32 | #include "avcodec.h" |
| 33 | #define BITSTREAM_READER_LE |
| 34 | #include "get_bits.h" |
| 35 | #include "dct.h" |
| 36 | #include "rdft.h" |
| 37 | #include "fmtconvert.h" |
| 38 | #include "internal.h" |
| 39 | #include "wma_freqs.h" |
| 40 | #include "libavutil/intfloat.h" |
| 41 | |
| 42 | static float quant_table[96]; |
| 43 | |
| 44 | #define MAX_CHANNELS 2 |
| 45 | #define BINK_BLOCK_MAX_SIZE (MAX_CHANNELS << 11) |
| 46 | |
| 47 | typedef struct { |
| 48 | GetBitContext gb; |
| 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 | float previous[MAX_CHANNELS][BINK_BLOCK_MAX_SIZE / 16]; ///< coeffs from previous audio block |
| 60 | uint8_t *packet_buffer; |
| 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 | /* determine frame length */ |
| 77 | if (avctx->sample_rate < 22050) { |
| 78 | frame_len_bits = 9; |
| 79 | } else if (avctx->sample_rate < 44100) { |
| 80 | frame_len_bits = 10; |
| 81 | } else { |
| 82 | frame_len_bits = 11; |
| 83 | } |
| 84 | |
| 85 | if (avctx->channels < 1 || avctx->channels > MAX_CHANNELS) { |
| 86 | av_log(avctx, AV_LOG_ERROR, "invalid number of channels: %d\n", avctx->channels); |
| 87 | return AVERROR_INVALIDDATA; |
| 88 | } |
| 89 | avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO : |
| 90 | AV_CH_LAYOUT_STEREO; |
| 91 | |
| 92 | s->version_b = avctx->extradata_size >= 4 && avctx->extradata[3] == 'b'; |
| 93 | |
| 94 | if (avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT) { |
| 95 | // audio is already interleaved for the RDFT format variant |
| 96 | avctx->sample_fmt = AV_SAMPLE_FMT_FLT; |
| 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 | avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; |
| 104 | } |
| 105 | |
| 106 | s->frame_len = 1 << frame_len_bits; |
| 107 | s->overlap_len = s->frame_len / 16; |
| 108 | s->block_size = (s->frame_len - s->overlap_len) * s->channels; |
| 109 | sample_rate_half = (sample_rate + 1) / 2; |
| 110 | if (avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT) |
| 111 | s->root = 2.0 / (sqrt(s->frame_len) * 32768.0); |
| 112 | else |
| 113 | s->root = s->frame_len / (sqrt(s->frame_len) * 32768.0); |
| 114 | for (i = 0; i < 96; i++) { |
| 115 | /* constant is result of 0.066399999/log10(M_E) */ |
| 116 | quant_table[i] = expf(i * 0.15289164787221953823f) * s->root; |
| 117 | } |
| 118 | |
| 119 | /* calculate number of bands */ |
| 120 | for (s->num_bands = 1; s->num_bands < 25; s->num_bands++) |
| 121 | if (sample_rate_half <= ff_wma_critical_freqs[s->num_bands - 1]) |
| 122 | break; |
| 123 | |
| 124 | s->bands = av_malloc((s->num_bands + 1) * sizeof(*s->bands)); |
| 125 | if (!s->bands) |
| 126 | return AVERROR(ENOMEM); |
| 127 | |
| 128 | /* populate bands data */ |
| 129 | s->bands[0] = 2; |
| 130 | for (i = 1; i < s->num_bands; i++) |
| 131 | s->bands[i] = (ff_wma_critical_freqs[i - 1] * s->frame_len / sample_rate_half) & ~1; |
| 132 | s->bands[s->num_bands] = s->frame_len; |
| 133 | |
| 134 | s->first = 1; |
| 135 | |
| 136 | if (CONFIG_BINKAUDIO_RDFT_DECODER && avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT) |
| 137 | ff_rdft_init(&s->trans.rdft, frame_len_bits, DFT_C2R); |
| 138 | else if (CONFIG_BINKAUDIO_DCT_DECODER) |
| 139 | ff_dct_init(&s->trans.dct, frame_len_bits, DCT_III); |
| 140 | else |
| 141 | return -1; |
| 142 | |
| 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | static float get_float(GetBitContext *gb) |
| 147 | { |
| 148 | int power = get_bits(gb, 5); |
| 149 | float f = ldexpf(get_bits_long(gb, 23), power - 23); |
| 150 | if (get_bits1(gb)) |
| 151 | f = -f; |
| 152 | return f; |
| 153 | } |
| 154 | |
| 155 | static const uint8_t rle_length_tab[16] = { |
| 156 | 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 32, 64 |
| 157 | }; |
| 158 | |
| 159 | /** |
| 160 | * Decode Bink Audio block |
| 161 | * @param[out] out Output buffer (must contain s->block_size elements) |
| 162 | * @return 0 on success, negative error code on failure |
| 163 | */ |
| 164 | static int decode_block(BinkAudioContext *s, float **out, int use_dct) |
| 165 | { |
| 166 | int ch, i, j, k; |
| 167 | float q, quant[25]; |
| 168 | int width, coeff; |
| 169 | GetBitContext *gb = &s->gb; |
| 170 | |
| 171 | if (use_dct) |
| 172 | skip_bits(gb, 2); |
| 173 | |
| 174 | for (ch = 0; ch < s->channels; ch++) { |
| 175 | FFTSample *coeffs = out[ch]; |
| 176 | |
| 177 | if (s->version_b) { |
| 178 | if (get_bits_left(gb) < 64) |
| 179 | return AVERROR_INVALIDDATA; |
| 180 | coeffs[0] = av_int2float(get_bits_long(gb, 32)) * s->root; |
| 181 | coeffs[1] = av_int2float(get_bits_long(gb, 32)) * s->root; |
| 182 | } else { |
| 183 | if (get_bits_left(gb) < 58) |
| 184 | return AVERROR_INVALIDDATA; |
| 185 | coeffs[0] = get_float(gb) * s->root; |
| 186 | coeffs[1] = get_float(gb) * s->root; |
| 187 | } |
| 188 | |
| 189 | if (get_bits_left(gb) < s->num_bands * 8) |
| 190 | return AVERROR_INVALIDDATA; |
| 191 | for (i = 0; i < s->num_bands; i++) { |
| 192 | int value = get_bits(gb, 8); |
| 193 | quant[i] = quant_table[FFMIN(value, 95)]; |
| 194 | } |
| 195 | |
| 196 | k = 0; |
| 197 | q = quant[0]; |
| 198 | |
| 199 | // parse coefficients |
| 200 | i = 2; |
| 201 | while (i < s->frame_len) { |
| 202 | if (s->version_b) { |
| 203 | j = i + 16; |
| 204 | } else { |
| 205 | int v = get_bits1(gb); |
| 206 | if (v) { |
| 207 | v = get_bits(gb, 4); |
| 208 | j = i + rle_length_tab[v] * 8; |
| 209 | } else { |
| 210 | j = i + 8; |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | j = FFMIN(j, s->frame_len); |
| 215 | |
| 216 | width = get_bits(gb, 4); |
| 217 | if (width == 0) { |
| 218 | memset(coeffs + i, 0, (j - i) * sizeof(*coeffs)); |
| 219 | i = j; |
| 220 | while (s->bands[k] < i) |
| 221 | q = quant[k++]; |
| 222 | } else { |
| 223 | while (i < j) { |
| 224 | if (s->bands[k] == i) |
| 225 | q = quant[k++]; |
| 226 | coeff = get_bits(gb, width); |
| 227 | if (coeff) { |
| 228 | int v; |
| 229 | v = get_bits1(gb); |
| 230 | if (v) |
| 231 | coeffs[i] = -q * coeff; |
| 232 | else |
| 233 | coeffs[i] = q * coeff; |
| 234 | } else { |
| 235 | coeffs[i] = 0.0f; |
| 236 | } |
| 237 | i++; |
| 238 | } |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | if (CONFIG_BINKAUDIO_DCT_DECODER && use_dct) { |
| 243 | coeffs[0] /= 0.5; |
| 244 | s->trans.dct.dct_calc(&s->trans.dct, coeffs); |
| 245 | } |
| 246 | else if (CONFIG_BINKAUDIO_RDFT_DECODER) |
| 247 | s->trans.rdft.rdft_calc(&s->trans.rdft, coeffs); |
| 248 | } |
| 249 | |
| 250 | for (ch = 0; ch < s->channels; ch++) { |
| 251 | int j; |
| 252 | int count = s->overlap_len * s->channels; |
| 253 | if (!s->first) { |
| 254 | j = ch; |
| 255 | for (i = 0; i < s->overlap_len; i++, j += s->channels) |
| 256 | out[ch][i] = (s->previous[ch][i] * (count - j) + |
| 257 | out[ch][i] * j) / count; |
| 258 | } |
| 259 | memcpy(s->previous[ch], &out[ch][s->frame_len - s->overlap_len], |
| 260 | s->overlap_len * sizeof(*s->previous[ch])); |
| 261 | } |
| 262 | |
| 263 | s->first = 0; |
| 264 | |
| 265 | return 0; |
| 266 | } |
| 267 | |
| 268 | static av_cold int decode_end(AVCodecContext *avctx) |
| 269 | { |
| 270 | BinkAudioContext * s = avctx->priv_data; |
| 271 | av_freep(&s->bands); |
| 272 | av_freep(&s->packet_buffer); |
| 273 | if (CONFIG_BINKAUDIO_RDFT_DECODER && avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT) |
| 274 | ff_rdft_end(&s->trans.rdft); |
| 275 | else if (CONFIG_BINKAUDIO_DCT_DECODER) |
| 276 | ff_dct_end(&s->trans.dct); |
| 277 | |
| 278 | return 0; |
| 279 | } |
| 280 | |
| 281 | static void get_bits_align32(GetBitContext *s) |
| 282 | { |
| 283 | int n = (-get_bits_count(s)) & 31; |
| 284 | if (n) skip_bits(s, n); |
| 285 | } |
| 286 | |
| 287 | static int decode_frame(AVCodecContext *avctx, void *data, |
| 288 | int *got_frame_ptr, AVPacket *avpkt) |
| 289 | { |
| 290 | BinkAudioContext *s = avctx->priv_data; |
| 291 | AVFrame *frame = data; |
| 292 | GetBitContext *gb = &s->gb; |
| 293 | int ret, consumed = 0; |
| 294 | |
| 295 | if (!get_bits_left(gb)) { |
| 296 | uint8_t *buf; |
| 297 | /* handle end-of-stream */ |
| 298 | if (!avpkt->size) { |
| 299 | *got_frame_ptr = 0; |
| 300 | return 0; |
| 301 | } |
| 302 | if (avpkt->size < 4) { |
| 303 | av_log(avctx, AV_LOG_ERROR, "Packet is too small\n"); |
| 304 | return AVERROR_INVALIDDATA; |
| 305 | } |
| 306 | buf = av_realloc(s->packet_buffer, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE); |
| 307 | if (!buf) |
| 308 | return AVERROR(ENOMEM); |
| 309 | memset(buf + avpkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE); |
| 310 | s->packet_buffer = buf; |
| 311 | memcpy(s->packet_buffer, avpkt->data, avpkt->size); |
| 312 | if ((ret = init_get_bits8(gb, s->packet_buffer, avpkt->size)) < 0) |
| 313 | return ret; |
| 314 | consumed = avpkt->size; |
| 315 | |
| 316 | /* skip reported size */ |
| 317 | skip_bits_long(gb, 32); |
| 318 | } |
| 319 | |
| 320 | /* get output buffer */ |
| 321 | frame->nb_samples = s->frame_len; |
| 322 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 323 | return ret; |
| 324 | |
| 325 | if (decode_block(s, (float **)frame->extended_data, |
| 326 | avctx->codec->id == AV_CODEC_ID_BINKAUDIO_DCT)) { |
| 327 | av_log(avctx, AV_LOG_ERROR, "Incomplete packet\n"); |
| 328 | return AVERROR_INVALIDDATA; |
| 329 | } |
| 330 | get_bits_align32(gb); |
| 331 | |
| 332 | frame->nb_samples = s->block_size / avctx->channels; |
| 333 | *got_frame_ptr = 1; |
| 334 | |
| 335 | return consumed; |
| 336 | } |
| 337 | |
| 338 | AVCodec ff_binkaudio_rdft_decoder = { |
| 339 | .name = "binkaudio_rdft", |
| 340 | .long_name = NULL_IF_CONFIG_SMALL("Bink Audio (RDFT)"), |
| 341 | .type = AVMEDIA_TYPE_AUDIO, |
| 342 | .id = AV_CODEC_ID_BINKAUDIO_RDFT, |
| 343 | .priv_data_size = sizeof(BinkAudioContext), |
| 344 | .init = decode_init, |
| 345 | .close = decode_end, |
| 346 | .decode = decode_frame, |
| 347 | .capabilities = CODEC_CAP_DELAY | CODEC_CAP_DR1, |
| 348 | }; |
| 349 | |
| 350 | AVCodec ff_binkaudio_dct_decoder = { |
| 351 | .name = "binkaudio_dct", |
| 352 | .long_name = NULL_IF_CONFIG_SMALL("Bink Audio (DCT)"), |
| 353 | .type = AVMEDIA_TYPE_AUDIO, |
| 354 | .id = AV_CODEC_ID_BINKAUDIO_DCT, |
| 355 | .priv_data_size = sizeof(BinkAudioContext), |
| 356 | .init = decode_init, |
| 357 | .close = decode_end, |
| 358 | .decode = decode_frame, |
| 359 | .capabilities = CODEC_CAP_DELAY | CODEC_CAP_DR1, |
| 360 | }; |