History

Bink Audio decoder

Originally committed as revision 21570 to svn://svn.ffmpeg.org/ffmpeg/trunk

Peter Ross committed 16 years ago

Commit c0d3f511 parent 2e375df7 files · +313 −2Browse files

Unified · Split

7 files
  1. Changelog +1 −1
  2. configure +2 −0
  3. doc/general.texi +2 −0
  4. libavcodec/Makefile +2 −0
  5. libavcodec/allcodecs.c +2 −0
  6. libavcodec/avcodec.h +1 −1
  7. libavcodec/binkaudio.c +303 −0
Changelog+1−1
@@ -51,7 +51,7 @@ version <next>: · 50 unmodified lines
5151 - SIPR decoder
5252 - Adobe Filmstrip muxer and demuxer
5353 - RTP depacketization of H.263
54−- Bink demuxer
54+- Bink demuxer and Bink Audio decoder
5555
5656
5757
configure+2−0
@@ -1165,6 +1165,8 @@ aac_encoder_select="fft mdct" · 1164 unmodified lines
11651165 ac3_decoder_select="fft mdct ac3_parser"
11661166 alac_encoder_select="lpc"
11671167 atrac3_decoder_select="fft mdct"
1168+binkaudio_dct_decoder_select="fft mdct rdft dct"
1169+binkaudio_rdft_decoder_select="fft mdct rdft"
11681170 cavs_decoder_select="golomb"
11691171 cook_decoder_select="fft mdct"
11701172 cscd_decoder_suggest="zlib"
doc/general.texi+2−0
@@ -550,6 +550,8 @@ following image formats are supported: · 549 unmodified lines
550550 @tab QuickTime fourcc 'alac'
551551 @item Atrac 1 @tab @tab X
552552 @item Atrac 3 @tab @tab X
553+@item Bink Audio @tab @tab X
554+ @tab Used in Bink and Smacker files in many games.
553555 @item Delphine Software International CIN audio @tab @tab X
554556 @tab Codec used in Delphine Software International games.
555557 @item COOK @tab @tab X
libavcodec/Makefile+2−0
@@ -65,6 +65,8 @@ OBJS-$(CONFIG_AURA2_DECODER) += aura.o · 64 unmodified lines
6565 OBJS-$(CONFIG_AVS_DECODER) += avs.o
6666 OBJS-$(CONFIG_BETHSOFTVID_DECODER) += bethsoftvideo.o
6767 OBJS-$(CONFIG_BFI_DECODER) += bfi.o
68+OBJS-$(CONFIG_BINKAUDIO_DCT_DECODER) += binkaudio.o wma.o
69+OBJS-$(CONFIG_BINKAUDIO_RDFT_DECODER) += binkaudio.o wma.o
6870 OBJS-$(CONFIG_BMP_DECODER) += bmp.o msrledec.o
6971 OBJS-$(CONFIG_BMP_ENCODER) += bmpenc.o
7072 OBJS-$(CONFIG_C93_DECODER) += c93.o
libavcodec/allcodecs.c+2−0
@@ -213,6 +213,8 @@ void avcodec_register_all(void) · 212 unmodified lines
213213 REGISTER_DECODER (APE, ape);
214214 REGISTER_DECODER (ATRAC1, atrac1);
215215 REGISTER_DECODER (ATRAC3, atrac3);
216+ REGISTER_DECODER (BINKAUDIO_DCT, binkaudio_dct);
217+ REGISTER_DECODER (BINKAUDIO_RDFT, binkaudio_rdft);
216218 REGISTER_DECODER (COOK, cook);
217219 REGISTER_DECODER (DCA, dca);
218220 REGISTER_DECODER (DSICINAUDIO, dsicinaudio);
libavcodec/avcodec.h+1−1
@@ -30,7 +30,7 @@ · 29 unmodified lines
3030 #include "libavutil/avutil.h"
3131
3232 #define LIBAVCODEC_VERSION_MAJOR 52
33−#define LIBAVCODEC_VERSION_MINOR 49
33+#define LIBAVCODEC_VERSION_MINOR 50
3434 #define LIBAVCODEC_VERSION_MICRO 0
3535
3636 #define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
libavcodec/binkaudio.c+303−0
@@ -0,0 +1,303 @@
1+/*
2+ * Bink Audio decoder
3+ * Copyright (c) 2007-2010 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 libavcodec/binkaudio.c
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+extern const uint16_t ff_wma_critical_freqs[25];
36+
37+#define MAX_CHANNELS 2
38+#define BINK_BLOCK_MAX_SIZE (MAX_CHANNELS << 11)
39+
40+typedef struct {
41+ AVCodecContext *avctx;
42+ GetBitContext gb;
43+ DSPContext dsp;
44+ int first;
45+ int channels;
46+ int frame_len; ///< transform size (samples)
47+ int overlap_len; ///< overlap size (samples)
48+ int block_size;
49+ int num_bands;
50+ unsigned int *bands;
51+ float root;
52+ DECLARE_ALIGNED_16(FFTSample, coeffs[BINK_BLOCK_MAX_SIZE]);
53+ DECLARE_ALIGNED_16(short, previous[BINK_BLOCK_MAX_SIZE / 16]); ///< coeffs from previous audio block
54+ float *coeffs_ptr[MAX_CHANNELS]; ///< pointers to the coeffs arrays for float_to_int16_interleave
55+ union {
56+ RDFTContext rdft;
57+ DCTContext dct;
58+ } trans;
59+} BinkAudioContext;
60+
61+
62+static av_cold int decode_init(AVCodecContext *avctx)
63+{
64+ BinkAudioContext *s = avctx->priv_data;
65+ int sample_rate = avctx->sample_rate;
66+ int sample_rate_half;
67+ int i;
68+ int frame_len_bits;
69+
70+ s->avctx = avctx;
71+ dsputil_init(&s->dsp, avctx);
72+
73+ /* determine frame length */
74+ if (avctx->sample_rate < 22050) {
75+ frame_len_bits = 9;
76+ } else if (avctx->sample_rate < 44100) {
77+ frame_len_bits = 10;
78+ } else {
79+ frame_len_bits = 11;
80+ }
81+ s->frame_len = 1 << frame_len_bits;
82+
83+ if (s->channels > MAX_CHANNELS) {
84+ av_log(s->avctx, AV_LOG_ERROR, "too many channels: %d\n", s->channels);
85+ return -1;
86+ }
87+
88+ if (avctx->codec->id == CODEC_ID_BINKAUDIO_RDFT) {
89+ // audio is already interleaved for the RDFT format variant
90+ sample_rate *= avctx->channels;
91+ s->frame_len *= avctx->channels;
92+ s->channels = 1;
93+ if (avctx->channels == 2)
94+ frame_len_bits++;
95+ } else {
96+ s->channels = avctx->channels;
97+ }
98+
99+ s->overlap_len = s->frame_len / 16;
100+ s->block_size = (s->frame_len - s->overlap_len) * s->channels;
101+ sample_rate_half = (sample_rate + 1) / 2;
102+ s->root = 2.0 / sqrt(s->frame_len);
103+
104+ /* calculate number of bands */
105+ for (s->num_bands = 1; s->num_bands < 25; s->num_bands++)
106+ if (sample_rate_half <= ff_wma_critical_freqs[s->num_bands - 1])
107+ break;
108+
109+ s->bands = av_malloc((s->num_bands + 1) * sizeof(*s->bands));
110+ if (!s->bands)
111+ return AVERROR(ENOMEM);
112+
113+ /* populate bands data */
114+ s->bands[0] = 1;
115+ for (i = 1; i < s->num_bands; i++)
116+ s->bands[i] = ff_wma_critical_freqs[i - 1] * (s->frame_len / 2) / sample_rate_half;
117+ s->bands[s->num_bands] = s->frame_len / 2;
118+
119+ s->first = 1;
120+ avctx->sample_fmt = SAMPLE_FMT_S16;
121+
122+ for (i = 0; i < s->channels; i++)
123+ s->coeffs_ptr[i] = s->coeffs + i * s->frame_len;
124+
125+ if (avctx->codec->id == CODEC_ID_BINKAUDIO_RDFT)
126+ ff_rdft_init(&s->trans.rdft, frame_len_bits, IRIDFT);
127+ else
128+ ff_dct_init(&s->trans.dct, frame_len_bits, 0);
129+
130+ return 0;
131+}
132+
133+static float get_float(GetBitContext *gb)
134+{
135+ int power = get_bits(gb, 5);
136+ float f = ldexpf(get_bits_long(gb, 23), power - 23);
137+ if (get_bits1(gb))
138+ f = -f;
139+ return f;
140+}
141+
142+static const uint8_t rle_length_tab[16] = {
143+ 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 32, 64
144+};
145+
146+/**
147+ * Decode Bink Audio block
148+ * @param[out] out Output buffer (must contain s->block_size elements)
149+ */
150+static void decode_block(BinkAudioContext *s, short *out, int use_dct)
151+{
152+ int ch, i, j, k;
153+ float q, quant[25];
154+ int width, coeff;
155+ GetBitContext *gb = &s->gb;
156+
157+ if (use_dct)
158+ skip_bits(gb, 2);
159+
160+ for (ch = 0; ch < s->channels; ch++) {
161+ FFTSample *coeffs = s->coeffs_ptr[ch];
162+ q = 0.0f;
163+ coeffs[0] = get_float(gb) * s->root;
164+ coeffs[1] = get_float(gb) * s->root;
165+
166+ for (i = 0; i < s->num_bands; i++) {
167+ /* constant is result of 0.066399999/log10(M_E) */
168+ int value = get_bits(gb, 8);
169+ quant[i] = expf(FFMIN(value, 95) * 0.15289164787221953823f) * s->root;
170+ }
171+
172+ // find band (k)
173+ for (k = 0; s->bands[k] < 1; k++) {
174+ q = quant[k];
175+ }
176+
177+ // parse coefficients
178+ i = 2;
179+ while (i < s->frame_len) {
180+ if (get_bits1(gb)) {
181+ j = i + rle_length_tab[get_bits(gb, 4)] * 8;
182+ } else {
183+ j = i + 8;
184+ }
185+
186+ j = FFMIN(j, s->frame_len);
187+
188+ width = get_bits(gb, 4);
189+ if (width == 0) {
190+ memset(coeffs + i, 0, (j - i) * sizeof(*coeffs));
191+ i = j;
192+ while (s->bands[k] * 2 < i)
193+ q = quant[k++];
194+ } else {
195+ while (i < j) {
196+ if (s->bands[k] * 2 == i)
197+ q = quant[k++];
198+ coeff = get_bits(gb, width);
199+ if (coeff) {
200+ if (get_bits1(gb))
201+ coeffs[i] = -q * coeff;
202+ else
203+ coeffs[i] = q * coeff;
204+ } else {
205+ coeffs[i] = 0.0f;
206+ }
207+ i++;
208+ }
209+ }
210+ }
211+
212+ if (use_dct)
213+ ff_dct_calc (&s->trans.dct, coeffs);
214+ else
215+ ff_rdft_calc(&s->trans.rdft, coeffs);
216+ }
217+
218+ s->dsp.float_to_int16_interleave(out, (const float **)s->coeffs_ptr, s->frame_len, s->channels);
219+
220+ if (!s->first) {
221+ int count = s->overlap_len * s->channels;
222+ int shift = av_log2(count);
223+ for (i = 0; i < count; i++) {
224+ out[i] = (s->previous[i] * (count - i) + out[i] * i) >> shift;
225+ }
226+ }
227+
228+ memcpy(s->previous, out + s->block_size,
229+ s->overlap_len * s->channels * sizeof(*out));
230+
231+ s->first = 0;
232+}
233+
234+static av_cold int decode_end(AVCodecContext *avctx)
235+{
236+ BinkAudioContext * s = avctx->priv_data;
237+ av_freep(&s->bands);
238+ if (avctx->codec->id == CODEC_ID_BINKAUDIO_RDFT)
239+ ff_rdft_end(&s->trans.rdft);
240+ else
241+ ff_dct_end(&s->trans.dct);
242+ return 0;
243+}
244+
245+static void get_bits_align32(GetBitContext *s)
246+{
247+ int n = (-get_bits_count(s)) & 31;
248+ if (n) skip_bits(s, n);
249+}
250+
251+static int decode_frame(AVCodecContext *avctx,
252+ void *data, int *data_size,
253+ AVPacket *avpkt)
254+{
255+ BinkAudioContext *s = avctx->priv_data;
256+ const uint8_t *buf = avpkt->data;
257+ int buf_size = avpkt->size;
258+ short *samples = data;
259+ short *samples_end = (short*)((uint8_t*)data + *data_size);
260+ int reported_size;
261+ GetBitContext *gb = &s->gb;
262+
263+ init_get_bits(gb, buf, buf_size * 8);
264+
265+ reported_size = get_bits_long(gb, 32);
266+ while (get_bits_count(gb) / 8 < buf_size &&
267+ samples + s->block_size <= samples_end) {
268+ decode_block(s, samples, avctx->codec->id == CODEC_ID_BINKAUDIO_DCT);
269+ samples += s->block_size;
270+ get_bits_align32(gb);
271+ }
272+
273+ *data_size = (uint8_t*)samples - (uint8_t*)data;
274+ if (reported_size != *data_size) {
275+ av_log(avctx, AV_LOG_WARNING, "reported data size (%d) does not match output data size (%d)\n",
276+ reported_size, *data_size);
277+ }
278+ return buf_size;
279+}
280+
281+AVCodec binkaudio_rdft_decoder = {
282+ "binkaudio_rdft",
283+ CODEC_TYPE_AUDIO,
284+ CODEC_ID_BINKAUDIO_RDFT,
285+ sizeof(BinkAudioContext),
286+ decode_init,
287+ NULL,
288+ decode_end,
289+ decode_frame,
290+ .long_name = NULL_IF_CONFIG_SMALL("Bink Audio (RDFT)")
291+};
292+
293+AVCodec binkaudio_dct_decoder = {
294+ "binkaudio_dct",
295+ CODEC_TYPE_AUDIO,
296+ CODEC_ID_BINKAUDIO_DCT,
297+ sizeof(BinkAudioContext),
298+ decode_init,
299+ NULL,
300+ decode_end,
301+ decode_frame,
302+ .long_name = NULL_IF_CONFIG_SMALL("Bink Audio (DCT)")
303+};

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