3 * Copyright (c) 2007-2011 Peter Ross (pross@xvid.org)
4 * Copyright (c) 2009 Daniel Verkamp (daniel@drv.nu)
6 * This file is part of FFmpeg.
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.
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.
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
27 * Technical details here:
28 * http://wiki.multimedia.cx/index.php?title=Bink_Audio
31 #include "config_components.h"
33 #include "libavutil/channel_layout.h"
34 #include "libavutil/intfloat.h"
35 #include "libavutil/mem_internal.h"
36 #include "libavutil/tx.h"
38 #define BITSTREAM_READER_LE
42 #include "codec_internal.h"
44 #include "wma_freqs.h"
46 #define MAX_DCT_CHANNELS 6
47 #define MAX_CHANNELS 2
48 #define BINK_BLOCK_MAX_SIZE (MAX_CHANNELS << 11)
50 typedef struct BinkAudioContext {
52 int version_b; ///< Bink version 'b'
56 int frame_len; ///< transform size (samples)
57 int overlap_len; ///< overlap size (samples)
61 unsigned int bands[26];
62 float previous[MAX_DCT_CHANNELS][BINK_BLOCK_MAX_SIZE / 16]; ///< coeffs from previous audio block
63 float quant_table[96];
70 static av_cold int decode_init(AVCodecContext *avctx)
72 BinkAudioContext *s = avctx->priv_data;
73 int sample_rate = avctx->sample_rate;
77 int max_channels = avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT ? MAX_CHANNELS : MAX_DCT_CHANNELS;
78 int channels = avctx->ch_layout.nb_channels;
80 /* determine frame length */
81 if (avctx->sample_rate < 22050) {
83 } else if (avctx->sample_rate < 44100) {
89 if (channels < 1 || channels > max_channels) {
90 av_log(avctx, AV_LOG_ERROR, "invalid number of channels: %d\n", channels);
91 return AVERROR_INVALIDDATA;
93 av_channel_layout_uninit(&avctx->ch_layout);
94 av_channel_layout_default(&avctx->ch_layout, channels);
96 s->version_b = avctx->extradata_size >= 4 && avctx->extradata[3] == 'b';
98 if (avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT) {
99 // audio is already interleaved for the RDFT format variant
100 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
101 if (sample_rate > INT_MAX / channels)
102 return AVERROR_INVALIDDATA;
103 sample_rate *= channels;
106 frame_len_bits += av_log2(channels);
108 s->channels = channels;
109 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
112 s->frame_len = 1 << frame_len_bits;
113 s->overlap_len = s->frame_len / 16;
114 s->block_size = (s->frame_len - s->overlap_len) * FFMIN(MAX_CHANNELS, s->channels);
115 sample_rate_half = (sample_rate + 1LL) / 2;
116 if (avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT)
117 s->root = 2.0 / (sqrt(s->frame_len) * 32768.0);
119 s->root = s->frame_len / (sqrt(s->frame_len) * 32768.0);
120 for (i = 0; i < 96; i++) {
121 /* constant is result of 0.066399999/log10(M_E) */
122 s->quant_table[i] = expf(i * 0.15289164787221953823f) * s->root;
125 /* calculate number of bands */
126 for (s->num_bands = 1; s->num_bands < 25; s->num_bands++)
127 if (sample_rate_half <= ff_wma_critical_freqs[s->num_bands - 1])
130 /* populate bands data */
132 for (i = 1; i < s->num_bands; i++)
133 s->bands[i] = (ff_wma_critical_freqs[i - 1] * s->frame_len / sample_rate_half) & ~1;
134 s->bands[s->num_bands] = s->frame_len;
138 if (CONFIG_BINKAUDIO_RDFT_DECODER && avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT) {
140 ret = av_tx_init(&s->tx, &s->tx_fn, AV_TX_FLOAT_RDFT, 1, 1 << frame_len_bits, &scale, 0);
141 } else if (CONFIG_BINKAUDIO_DCT_DECODER) {
142 float scale = 1.0 / (1 << frame_len_bits);
143 ret = av_tx_init(&s->tx, &s->tx_fn, AV_TX_FLOAT_DCT, 1, 1 << (frame_len_bits - 1), &scale, 0);
150 s->pkt = avctx->internal->in_pkt;
155 static float get_float(GetBitContext *gb)
157 int power = get_bits(gb, 5);
158 float f = ldexpf(get_bits(gb, 23), power - 23);
164 static const uint8_t rle_length_tab[16] = {
165 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 32, 64
169 * Decode Bink Audio block
170 * @param[out] out Output buffer (must contain s->block_size elements)
171 * @return 0 on success, negative error code on failure
173 static int decode_block(BinkAudioContext *s, float **out, int use_dct,
174 int channels, int ch_offset)
179 GetBitContext *gb = &s->gb;
180 LOCAL_ALIGNED_32(float, coeffs, [4098]);
185 for (ch = 0; ch < channels; ch++) {
187 if (get_bits_left(gb) < 64)
188 return AVERROR_INVALIDDATA;
189 coeffs[0] = av_int2float(get_bits_long(gb, 32)) * s->root;
190 coeffs[1] = av_int2float(get_bits_long(gb, 32)) * s->root;
192 if (get_bits_left(gb) < 58)
193 return AVERROR_INVALIDDATA;
194 coeffs[0] = get_float(gb) * s->root;
195 coeffs[1] = get_float(gb) * s->root;
198 if (get_bits_left(gb) < s->num_bands * 8)
199 return AVERROR_INVALIDDATA;
200 for (i = 0; i < s->num_bands; i++) {
201 int value = get_bits(gb, 8);
202 quant[i] = s->quant_table[FFMIN(value, 95)];
208 // parse coefficients
210 while (i < s->frame_len) {
214 int v = get_bits1(gb);
217 j = i + rle_length_tab[v] * 8;
223 j = FFMIN(j, s->frame_len);
225 width = get_bits(gb, 4);
227 memset(coeffs + i, 0, (j - i) * sizeof(*coeffs));
229 while (s->bands[k] < i)
233 if (s->bands[k] == i)
235 coeff = get_bits(gb, width);
240 coeffs[i] = -q * coeff;
242 coeffs[i] = q * coeff;
251 if (CONFIG_BINKAUDIO_DCT_DECODER && use_dct) {
253 s->tx_fn(s->tx, out[ch + ch_offset], coeffs, sizeof(float));
254 } else if (CONFIG_BINKAUDIO_RDFT_DECODER) {
255 for (int i = 2; i < s->frame_len; i += 2)
258 coeffs[s->frame_len + 0] = coeffs[1];
259 coeffs[s->frame_len + 1] = coeffs[1] = 0;
260 s->tx_fn(s->tx, out[ch + ch_offset], coeffs, sizeof(AVComplexFloat));
264 for (ch = 0; ch < channels; ch++) {
266 int count = s->overlap_len * channels;
269 for (i = 0; i < s->overlap_len; i++, j += channels)
270 out[ch + ch_offset][i] = (s->previous[ch + ch_offset][i] * (count - j) +
271 out[ch + ch_offset][i] * j) / count;
273 memcpy(s->previous[ch + ch_offset], &out[ch + ch_offset][s->frame_len - s->overlap_len],
274 s->overlap_len * sizeof(*s->previous[ch + ch_offset]));
282 static av_cold int decode_end(AVCodecContext *avctx)
284 BinkAudioContext * s = avctx->priv_data;
285 av_tx_uninit(&s->tx);
289 static void get_bits_align32(GetBitContext *s)
291 int n = (-get_bits_count(s)) & 31;
292 if (n) skip_bits(s, n);
295 static int binkaudio_receive_frame(AVCodecContext *avctx, AVFrame *frame)
297 BinkAudioContext *s = avctx->priv_data;
298 GetBitContext *gb = &s->gb;
302 new_pkt = !s->pkt->data;
304 ret = ff_decode_get_packet(avctx, s->pkt);
310 if (s->pkt->size < 4) {
311 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
312 ret = AVERROR_INVALIDDATA;
316 ret = init_get_bits8(gb, s->pkt->data, s->pkt->size);
320 /* skip reported size */
321 skip_bits_long(gb, 32);
324 /* get output buffer */
325 if (s->ch_offset == 0) {
326 frame->nb_samples = s->frame_len;
327 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
330 frame->pts = AV_NOPTS_VALUE;
333 if (decode_block(s, (float **)frame->extended_data,
334 avctx->codec->id == AV_CODEC_ID_BINKAUDIO_DCT,
335 FFMIN(MAX_CHANNELS, s->channels - s->ch_offset), s->ch_offset)) {
336 av_log(avctx, AV_LOG_ERROR, "Incomplete packet\n");
337 ret = AVERROR_INVALIDDATA;
340 s->ch_offset += MAX_CHANNELS;
341 get_bits_align32(gb);
342 if (!get_bits_left(gb)) {
343 memset(gb, 0, sizeof(*gb));
344 av_packet_unref(s->pkt);
346 if (s->ch_offset >= s->channels) {
352 frame->nb_samples = s->block_size / FFMIN(avctx->ch_layout.nb_channels, MAX_CHANNELS);
357 av_packet_unref(s->pkt);
361 static void decode_flush(AVCodecContext *avctx)
363 BinkAudioContext *const s = avctx->priv_data;
365 /* s->pkt coincides with avctx->internal->in_pkt
366 * and is unreferenced generically when flushing. */
371 const FFCodec ff_binkaudio_rdft_decoder = {
372 .p.name = "binkaudio_rdft",
373 CODEC_LONG_NAME("Bink Audio (RDFT)"),
374 .p.type = AVMEDIA_TYPE_AUDIO,
375 .p.id = AV_CODEC_ID_BINKAUDIO_RDFT,
376 .priv_data_size = sizeof(BinkAudioContext),
378 .flush = decode_flush,
380 FF_CODEC_RECEIVE_FRAME_CB(binkaudio_receive_frame),
381 .p.capabilities = AV_CODEC_CAP_DR1,
382 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
385 const FFCodec ff_binkaudio_dct_decoder = {
386 .p.name = "binkaudio_dct",
387 CODEC_LONG_NAME("Bink Audio (DCT)"),
388 .p.type = AVMEDIA_TYPE_AUDIO,
389 .p.id = AV_CODEC_ID_BINKAUDIO_DCT,
390 .priv_data_size = sizeof(BinkAudioContext),
392 .flush = decode_flush,
394 FF_CODEC_RECEIVE_FRAME_CB(binkaudio_receive_frame),
395 .p.capabilities = AV_CODEC_CAP_DR1,
396 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,