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00031 #include "avcodec.h"
00032 #include "internal.h"
00033 #define BITSTREAM_READER_LE
00034 #include "get_bits.h"
00035 #include "dsputil.h"
00036 #include "dct.h"
00037 #include "rdft.h"
00038 #include "fmtconvert.h"
00039 #include "libavutil/intfloat.h"
00040
00041 extern const uint16_t ff_wma_critical_freqs[25];
00042
00043 static float quant_table[96];
00044
00045 #define MAX_CHANNELS 2
00046 #define BINK_BLOCK_MAX_SIZE (MAX_CHANNELS << 11)
00047
00048 typedef struct {
00049 AVFrame frame;
00050 GetBitContext gb;
00051 DSPContext dsp;
00052 FmtConvertContext fmt_conv;
00053 int version_b;
00054 int first;
00055 int channels;
00056 int frame_len;
00057 int overlap_len;
00058 int block_size;
00059 int num_bands;
00060 unsigned int *bands;
00061 float root;
00062 DECLARE_ALIGNED(32, FFTSample, coeffs)[BINK_BLOCK_MAX_SIZE];
00063 DECLARE_ALIGNED(16, int16_t, previous)[BINK_BLOCK_MAX_SIZE / 16];
00064 DECLARE_ALIGNED(16, int16_t, current)[BINK_BLOCK_MAX_SIZE / 16];
00065 float *coeffs_ptr[MAX_CHANNELS];
00066 float *prev_ptr[MAX_CHANNELS];
00067 uint8_t *packet_buffer;
00068 union {
00069 RDFTContext rdft;
00070 DCTContext dct;
00071 } trans;
00072 } BinkAudioContext;
00073
00074
00075 static av_cold int decode_init(AVCodecContext *avctx)
00076 {
00077 BinkAudioContext *s = avctx->priv_data;
00078 int sample_rate = avctx->sample_rate;
00079 int sample_rate_half;
00080 int i;
00081 int frame_len_bits;
00082
00083 dsputil_init(&s->dsp, avctx);
00084 ff_fmt_convert_init(&s->fmt_conv, avctx);
00085
00086
00087 if (avctx->sample_rate < 22050) {
00088 frame_len_bits = 9;
00089 } else if (avctx->sample_rate < 44100) {
00090 frame_len_bits = 10;
00091 } else {
00092 frame_len_bits = 11;
00093 }
00094
00095 if (avctx->channels > MAX_CHANNELS) {
00096 av_log(avctx, AV_LOG_ERROR, "too many channels: %d\n", avctx->channels);
00097 return -1;
00098 }
00099
00100 s->version_b = avctx->extradata && avctx->extradata[3] == 'b';
00101
00102 if (avctx->codec->id == CODEC_ID_BINKAUDIO_RDFT) {
00103
00104 sample_rate *= avctx->channels;
00105 s->channels = 1;
00106 if (!s->version_b)
00107 frame_len_bits += av_log2(avctx->channels);
00108 } else {
00109 s->channels = avctx->channels;
00110 }
00111
00112 s->frame_len = 1 << frame_len_bits;
00113 s->overlap_len = s->frame_len / 16;
00114 s->block_size = (s->frame_len - s->overlap_len) * s->channels;
00115 sample_rate_half = (sample_rate + 1) / 2;
00116 s->root = 2.0 / sqrt(s->frame_len);
00117 for (i = 0; i < 96; i++) {
00118
00119 quant_table[i] = expf(i * 0.15289164787221953823f) * s->root;
00120 }
00121
00122
00123 for (s->num_bands = 1; s->num_bands < 25; s->num_bands++)
00124 if (sample_rate_half <= ff_wma_critical_freqs[s->num_bands - 1])
00125 break;
00126
00127 s->bands = av_malloc((s->num_bands + 1) * sizeof(*s->bands));
00128 if (!s->bands)
00129 return AVERROR(ENOMEM);
00130
00131
00132 s->bands[0] = 2;
00133 for (i = 1; i < s->num_bands; i++)
00134 s->bands[i] = (ff_wma_critical_freqs[i - 1] * s->frame_len / sample_rate_half) & ~1;
00135 s->bands[s->num_bands] = s->frame_len;
00136
00137 s->first = 1;
00138 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
00139
00140 for (i = 0; i < s->channels; i++) {
00141 s->coeffs_ptr[i] = s->coeffs + i * s->frame_len;
00142 s->prev_ptr[i] = s->coeffs_ptr[i] + s->frame_len - s->overlap_len;
00143 }
00144
00145 if (CONFIG_BINKAUDIO_RDFT_DECODER && avctx->codec->id == CODEC_ID_BINKAUDIO_RDFT)
00146 ff_rdft_init(&s->trans.rdft, frame_len_bits, DFT_C2R);
00147 else if (CONFIG_BINKAUDIO_DCT_DECODER)
00148 ff_dct_init(&s->trans.dct, frame_len_bits, DCT_III);
00149 else
00150 return -1;
00151
00152 avcodec_get_frame_defaults(&s->frame);
00153 avctx->coded_frame = &s->frame;
00154
00155 return 0;
00156 }
00157
00158 static float get_float(GetBitContext *gb)
00159 {
00160 int power = get_bits(gb, 5);
00161 float f = ldexpf(get_bits_long(gb, 23), power - 23);
00162 if (get_bits1(gb))
00163 f = -f;
00164 return f;
00165 }
00166
00167 static const uint8_t rle_length_tab[16] = {
00168 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 32, 64
00169 };
00170
00171 #define GET_BITS_SAFE(out, nbits) do { \
00172 if (get_bits_left(gb) < nbits) \
00173 return AVERROR_INVALIDDATA; \
00174 out = get_bits(gb, nbits); \
00175 } while (0)
00176
00182 static int decode_block(BinkAudioContext *s, int16_t *out, int use_dct)
00183 {
00184 int ch, i, j, k;
00185 float q, quant[25];
00186 int width, coeff;
00187 GetBitContext *gb = &s->gb;
00188
00189 if (use_dct)
00190 skip_bits(gb, 2);
00191
00192 for (ch = 0; ch < s->channels; ch++) {
00193 FFTSample *coeffs = s->coeffs_ptr[ch];
00194 if (s->version_b) {
00195 if (get_bits_left(gb) < 64)
00196 return AVERROR_INVALIDDATA;
00197 coeffs[0] = av_int2float(get_bits_long(gb, 32)) * s->root;
00198 coeffs[1] = av_int2float(get_bits_long(gb, 32)) * s->root;
00199 } else {
00200 if (get_bits_left(gb) < 58)
00201 return AVERROR_INVALIDDATA;
00202 coeffs[0] = get_float(gb) * s->root;
00203 coeffs[1] = get_float(gb) * s->root;
00204 }
00205
00206 if (get_bits_left(gb) < s->num_bands * 8)
00207 return AVERROR_INVALIDDATA;
00208 for (i = 0; i < s->num_bands; i++) {
00209 int value = get_bits(gb, 8);
00210 quant[i] = quant_table[FFMIN(value, 95)];
00211 }
00212
00213 k = 0;
00214 q = quant[0];
00215
00216
00217 i = 2;
00218 while (i < s->frame_len) {
00219 if (s->version_b) {
00220 j = i + 16;
00221 } else {
00222 int v;
00223 GET_BITS_SAFE(v, 1);
00224 if (v) {
00225 GET_BITS_SAFE(v, 4);
00226 j = i + rle_length_tab[v] * 8;
00227 } else {
00228 j = i + 8;
00229 }
00230 }
00231
00232 j = FFMIN(j, s->frame_len);
00233
00234 GET_BITS_SAFE(width, 4);
00235 if (width == 0) {
00236 memset(coeffs + i, 0, (j - i) * sizeof(*coeffs));
00237 i = j;
00238 while (s->bands[k] < i)
00239 q = quant[k++];
00240 } else {
00241 while (i < j) {
00242 if (s->bands[k] == i)
00243 q = quant[k++];
00244 GET_BITS_SAFE(coeff, width);
00245 if (coeff) {
00246 int v;
00247 GET_BITS_SAFE(v, 1);
00248 if (v)
00249 coeffs[i] = -q * coeff;
00250 else
00251 coeffs[i] = q * coeff;
00252 } else {
00253 coeffs[i] = 0.0f;
00254 }
00255 i++;
00256 }
00257 }
00258 }
00259
00260 if (CONFIG_BINKAUDIO_DCT_DECODER && use_dct) {
00261 coeffs[0] /= 0.5;
00262 s->trans.dct.dct_calc(&s->trans.dct, coeffs);
00263 s->dsp.vector_fmul_scalar(coeffs, coeffs, s->frame_len / 2, s->frame_len);
00264 }
00265 else if (CONFIG_BINKAUDIO_RDFT_DECODER)
00266 s->trans.rdft.rdft_calc(&s->trans.rdft, coeffs);
00267 }
00268
00269 s->fmt_conv.float_to_int16_interleave(s->current,
00270 (const float **)s->prev_ptr,
00271 s->overlap_len, s->channels);
00272 s->fmt_conv.float_to_int16_interleave(out, (const float **)s->coeffs_ptr,
00273 s->frame_len - s->overlap_len,
00274 s->channels);
00275
00276 if (!s->first) {
00277 int count = s->overlap_len * s->channels;
00278 int shift = av_log2(count);
00279 for (i = 0; i < count; i++) {
00280 out[i] = (s->previous[i] * (count - i) + out[i] * i) >> shift;
00281 }
00282 }
00283
00284 memcpy(s->previous, s->current,
00285 s->overlap_len * s->channels * sizeof(*s->previous));
00286
00287 s->first = 0;
00288
00289 return 0;
00290 }
00291
00292 static av_cold int decode_end(AVCodecContext *avctx)
00293 {
00294 BinkAudioContext * s = avctx->priv_data;
00295 av_freep(&s->bands);
00296 av_freep(&s->packet_buffer);
00297 if (CONFIG_BINKAUDIO_RDFT_DECODER && avctx->codec->id == CODEC_ID_BINKAUDIO_RDFT)
00298 ff_rdft_end(&s->trans.rdft);
00299 else if (CONFIG_BINKAUDIO_DCT_DECODER)
00300 ff_dct_end(&s->trans.dct);
00301
00302 return 0;
00303 }
00304
00305 static void get_bits_align32(GetBitContext *s)
00306 {
00307 int n = (-get_bits_count(s)) & 31;
00308 if (n) skip_bits(s, n);
00309 }
00310
00311 static int decode_frame(AVCodecContext *avctx, void *data,
00312 int *got_frame_ptr, AVPacket *avpkt)
00313 {
00314 BinkAudioContext *s = avctx->priv_data;
00315 int16_t *samples;
00316 GetBitContext *gb = &s->gb;
00317 int ret, consumed = 0;
00318
00319 if (!get_bits_left(gb)) {
00320 uint8_t *buf;
00321
00322 if (!avpkt->size) {
00323 *got_frame_ptr = 0;
00324 return 0;
00325 }
00326 if (avpkt->size < 4) {
00327 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
00328 return AVERROR_INVALIDDATA;
00329 }
00330 buf = av_realloc(s->packet_buffer, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
00331 if (!buf)
00332 return AVERROR(ENOMEM);
00333 s->packet_buffer = buf;
00334 memcpy(s->packet_buffer, avpkt->data, avpkt->size);
00335 init_get_bits(gb, s->packet_buffer, avpkt->size * 8);
00336 consumed = avpkt->size;
00337
00338
00339 skip_bits_long(gb, 32);
00340 }
00341
00342
00343 s->frame.nb_samples = s->block_size / avctx->channels;
00344 if ((ret = ff_get_buffer(avctx, &s->frame)) < 0) {
00345 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00346 return ret;
00347 }
00348 samples = (int16_t *)s->frame.data[0];
00349
00350 if (decode_block(s, samples, avctx->codec->id == CODEC_ID_BINKAUDIO_DCT)) {
00351 av_log(avctx, AV_LOG_ERROR, "Incomplete packet\n");
00352 return AVERROR_INVALIDDATA;
00353 }
00354 get_bits_align32(gb);
00355
00356 *got_frame_ptr = 1;
00357 *(AVFrame *)data = s->frame;
00358
00359 return consumed;
00360 }
00361
00362 AVCodec ff_binkaudio_rdft_decoder = {
00363 .name = "binkaudio_rdft",
00364 .type = AVMEDIA_TYPE_AUDIO,
00365 .id = CODEC_ID_BINKAUDIO_RDFT,
00366 .priv_data_size = sizeof(BinkAudioContext),
00367 .init = decode_init,
00368 .close = decode_end,
00369 .decode = decode_frame,
00370 .capabilities = CODEC_CAP_DELAY | CODEC_CAP_DR1,
00371 .long_name = NULL_IF_CONFIG_SMALL("Bink Audio (RDFT)")
00372 };
00373
00374 AVCodec ff_binkaudio_dct_decoder = {
00375 .name = "binkaudio_dct",
00376 .type = AVMEDIA_TYPE_AUDIO,
00377 .id = CODEC_ID_BINKAUDIO_DCT,
00378 .priv_data_size = sizeof(BinkAudioContext),
00379 .init = decode_init,
00380 .close = decode_end,
00381 .decode = decode_frame,
00382 .capabilities = CODEC_CAP_DELAY | CODEC_CAP_DR1,
00383 .long_name = NULL_IF_CONFIG_SMALL("Bink Audio (DCT)")
00384 };