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00022 #include "avcodec.h"
00023 #include "internal.h"
00024 #include "wma.h"
00025 #include "libavutil/avassert.h"
00026
00027
00028 static int encode_init(AVCodecContext * avctx){
00029 WMACodecContext *s = avctx->priv_data;
00030 int i, flags1, flags2, block_align;
00031 uint8_t *extradata;
00032
00033 s->avctx = avctx;
00034
00035 if(avctx->channels > MAX_CHANNELS) {
00036 av_log(avctx, AV_LOG_ERROR, "too many channels: got %i, need %i or fewer\n",
00037 avctx->channels, MAX_CHANNELS);
00038 return AVERROR(EINVAL);
00039 }
00040
00041 if (avctx->sample_rate > 48000) {
00042 av_log(avctx, AV_LOG_ERROR, "sample rate is too high: %d > 48kHz\n",
00043 avctx->sample_rate);
00044 return AVERROR(EINVAL);
00045 }
00046
00047 if(avctx->bit_rate < 24*1000) {
00048 av_log(avctx, AV_LOG_ERROR, "bitrate too low: got %i, need 24000 or higher\n",
00049 avctx->bit_rate);
00050 return AVERROR(EINVAL);
00051 }
00052
00053
00054 flags1 = 0;
00055 flags2 = 1;
00056 if (avctx->codec->id == AV_CODEC_ID_WMAV1) {
00057 extradata= av_malloc(4);
00058 avctx->extradata_size= 4;
00059 AV_WL16(extradata, flags1);
00060 AV_WL16(extradata+2, flags2);
00061 } else if (avctx->codec->id == AV_CODEC_ID_WMAV2) {
00062 extradata= av_mallocz(10);
00063 avctx->extradata_size= 10;
00064 AV_WL32(extradata, flags1);
00065 AV_WL16(extradata+4, flags2);
00066 }else
00067 av_assert0(0);
00068 avctx->extradata= extradata;
00069 s->use_exp_vlc = flags2 & 0x0001;
00070 s->use_bit_reservoir = flags2 & 0x0002;
00071 s->use_variable_block_len = flags2 & 0x0004;
00072 if (avctx->channels == 2)
00073 s->ms_stereo = 1;
00074
00075 ff_wma_init(avctx, flags2);
00076
00077
00078 for(i = 0; i < s->nb_block_sizes; i++)
00079 ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 0, 1.0);
00080
00081 block_align = avctx->bit_rate * (int64_t)s->frame_len /
00082 (avctx->sample_rate * 8);
00083 block_align = FFMIN(block_align, MAX_CODED_SUPERFRAME_SIZE);
00084 avctx->block_align = block_align;
00085
00086 avctx->frame_size = avctx->delay = s->frame_len;
00087
00088 #if FF_API_OLD_ENCODE_AUDIO
00089 avctx->coded_frame = &s->frame;
00090 avcodec_get_frame_defaults(avctx->coded_frame);
00091 #endif
00092
00093 return 0;
00094 }
00095
00096
00097 static void apply_window_and_mdct(AVCodecContext * avctx, const AVFrame *frame)
00098 {
00099 WMACodecContext *s = avctx->priv_data;
00100 float **audio = (float **)frame->extended_data;
00101 int len = frame->nb_samples;
00102 int window_index= s->frame_len_bits - s->block_len_bits;
00103 FFTContext *mdct = &s->mdct_ctx[window_index];
00104 int ch;
00105 const float * win = s->windows[window_index];
00106 int window_len = 1 << s->block_len_bits;
00107 float n = 2.0 * 32768.0 / window_len;
00108
00109 for (ch = 0; ch < avctx->channels; ch++) {
00110 memcpy(s->output, s->frame_out[ch], window_len * sizeof(*s->output));
00111 s->fdsp.vector_fmul_scalar(s->frame_out[ch], audio[ch], n, len);
00112 s->dsp.vector_fmul_reverse(&s->output[window_len], s->frame_out[ch], win, len);
00113 s->fdsp.vector_fmul(s->frame_out[ch], s->frame_out[ch], win, len);
00114 mdct->mdct_calc(mdct, s->coefs[ch], s->output);
00115 }
00116 }
00117
00118
00119 static void init_exp(WMACodecContext *s, int ch, const int *exp_param){
00120 int n;
00121 const uint16_t *ptr;
00122 float v, *q, max_scale, *q_end;
00123
00124 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
00125 q = s->exponents[ch];
00126 q_end = q + s->block_len;
00127 max_scale = 0;
00128 while (q < q_end) {
00129
00130 v = pow(10, *exp_param++ * (1.0 / 16.0));
00131 max_scale= FFMAX(max_scale, v);
00132 n = *ptr++;
00133 do {
00134 *q++ = v;
00135 } while (--n);
00136 }
00137 s->max_exponent[ch] = max_scale;
00138 }
00139
00140 static void encode_exp_vlc(WMACodecContext *s, int ch, const int *exp_param){
00141 int last_exp;
00142 const uint16_t *ptr;
00143 float *q, *q_end;
00144
00145 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
00146 q = s->exponents[ch];
00147 q_end = q + s->block_len;
00148 if (s->version == 1) {
00149 last_exp= *exp_param++;
00150 av_assert0(last_exp-10 >= 0 && last_exp-10 < 32);
00151 put_bits(&s->pb, 5, last_exp - 10);
00152 q+= *ptr++;
00153 }else
00154 last_exp = 36;
00155 while (q < q_end) {
00156 int exp = *exp_param++;
00157 int code = exp - last_exp + 60;
00158 av_assert1(code >= 0 && code < 120);
00159 put_bits(&s->pb, ff_aac_scalefactor_bits[code], ff_aac_scalefactor_code[code]);
00160
00161 q+= *ptr++;
00162 last_exp= exp;
00163 }
00164 }
00165
00166 static int encode_block(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], int total_gain){
00167 int v, bsize, ch, coef_nb_bits, parse_exponents;
00168 float mdct_norm;
00169 int nb_coefs[MAX_CHANNELS];
00170 static const int fixed_exp[25]={20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20};
00171
00172
00173 if (s->use_variable_block_len) {
00174 av_assert0(0);
00175 }else{
00176
00177 s->next_block_len_bits = s->frame_len_bits;
00178 s->prev_block_len_bits = s->frame_len_bits;
00179 s->block_len_bits = s->frame_len_bits;
00180 }
00181
00182 s->block_len = 1 << s->block_len_bits;
00183
00184 bsize = s->frame_len_bits - s->block_len_bits;
00185
00186
00187 v = s->coefs_end[bsize] - s->coefs_start;
00188 for (ch = 0; ch < s->avctx->channels; ch++)
00189 nb_coefs[ch] = v;
00190 {
00191 int n4 = s->block_len / 2;
00192 mdct_norm = 1.0 / (float)n4;
00193 if (s->version == 1) {
00194 mdct_norm *= sqrt(n4);
00195 }
00196 }
00197
00198 if (s->avctx->channels == 2) {
00199 put_bits(&s->pb, 1, !!s->ms_stereo);
00200 }
00201
00202 for (ch = 0; ch < s->avctx->channels; ch++) {
00203 s->channel_coded[ch] = 1;
00204 if (s->channel_coded[ch]) {
00205 init_exp(s, ch, fixed_exp);
00206 }
00207 }
00208
00209 for (ch = 0; ch < s->avctx->channels; ch++) {
00210 if (s->channel_coded[ch]) {
00211 WMACoef *coefs1;
00212 float *coefs, *exponents, mult;
00213 int i, n;
00214
00215 coefs1 = s->coefs1[ch];
00216 exponents = s->exponents[ch];
00217 mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
00218 mult *= mdct_norm;
00219 coefs = src_coefs[ch];
00220 if (s->use_noise_coding && 0) {
00221 av_assert0(0);
00222 } else {
00223 coefs += s->coefs_start;
00224 n = nb_coefs[ch];
00225 for(i = 0;i < n; i++){
00226 double t= *coefs++ / (exponents[i] * mult);
00227 if(t<-32768 || t>32767)
00228 return -1;
00229
00230 coefs1[i] = lrint(t);
00231 }
00232 }
00233 }
00234 }
00235
00236 v = 0;
00237 for (ch = 0; ch < s->avctx->channels; ch++) {
00238 int a = s->channel_coded[ch];
00239 put_bits(&s->pb, 1, a);
00240 v |= a;
00241 }
00242
00243 if (!v)
00244 return 1;
00245
00246 for(v= total_gain-1; v>=127; v-= 127)
00247 put_bits(&s->pb, 7, 127);
00248 put_bits(&s->pb, 7, v);
00249
00250 coef_nb_bits= ff_wma_total_gain_to_bits(total_gain);
00251
00252 if (s->use_noise_coding) {
00253 for (ch = 0; ch < s->avctx->channels; ch++) {
00254 if (s->channel_coded[ch]) {
00255 int i, n;
00256 n = s->exponent_high_sizes[bsize];
00257 for(i=0;i<n;i++) {
00258 put_bits(&s->pb, 1, s->high_band_coded[ch][i]= 0);
00259 if (0)
00260 nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
00261 }
00262 }
00263 }
00264 }
00265
00266 parse_exponents = 1;
00267 if (s->block_len_bits != s->frame_len_bits) {
00268 put_bits(&s->pb, 1, parse_exponents);
00269 }
00270
00271 if (parse_exponents) {
00272 for (ch = 0; ch < s->avctx->channels; ch++) {
00273 if (s->channel_coded[ch]) {
00274 if (s->use_exp_vlc) {
00275 encode_exp_vlc(s, ch, fixed_exp);
00276 } else {
00277 av_assert0(0);
00278
00279 }
00280 }
00281 }
00282 } else {
00283 av_assert0(0);
00284 }
00285
00286 for (ch = 0; ch < s->avctx->channels; ch++) {
00287 if (s->channel_coded[ch]) {
00288 int run, tindex;
00289 WMACoef *ptr, *eptr;
00290 tindex = (ch == 1 && s->ms_stereo);
00291 ptr = &s->coefs1[ch][0];
00292 eptr = ptr + nb_coefs[ch];
00293
00294 run=0;
00295 for(;ptr < eptr; ptr++){
00296 if(*ptr){
00297 int level= *ptr;
00298 int abs_level= FFABS(level);
00299 int code= 0;
00300 if(abs_level <= s->coef_vlcs[tindex]->max_level){
00301 if(run < s->coef_vlcs[tindex]->levels[abs_level-1])
00302 code= run + s->int_table[tindex][abs_level-1];
00303 }
00304
00305 av_assert2(code < s->coef_vlcs[tindex]->n);
00306 put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[code], s->coef_vlcs[tindex]->huffcodes[code]);
00307
00308 if(code == 0){
00309 if(1<<coef_nb_bits <= abs_level)
00310 return -1;
00311
00312 put_bits(&s->pb, coef_nb_bits, abs_level);
00313 put_bits(&s->pb, s->frame_len_bits, run);
00314 }
00315 put_bits(&s->pb, 1, level < 0);
00316 run=0;
00317 }else{
00318 run++;
00319 }
00320 }
00321 if(run)
00322 put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[1], s->coef_vlcs[tindex]->huffcodes[1]);
00323 }
00324 if (s->version == 1 && s->avctx->channels >= 2) {
00325 avpriv_align_put_bits(&s->pb);
00326 }
00327 }
00328 return 0;
00329 }
00330
00331 static int encode_frame(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], uint8_t *buf, int buf_size, int total_gain){
00332 init_put_bits(&s->pb, buf, buf_size);
00333
00334 if (s->use_bit_reservoir) {
00335 av_assert0(0);
00336 }else{
00337 if(encode_block(s, src_coefs, total_gain) < 0)
00338 return INT_MAX;
00339 }
00340
00341 avpriv_align_put_bits(&s->pb);
00342
00343 return put_bits_count(&s->pb) / 8 - s->avctx->block_align;
00344 }
00345
00346 static int encode_superframe(AVCodecContext *avctx, AVPacket *avpkt,
00347 const AVFrame *frame, int *got_packet_ptr)
00348 {
00349 WMACodecContext *s = avctx->priv_data;
00350 int i, total_gain, ret, error;
00351
00352 s->block_len_bits= s->frame_len_bits;
00353 s->block_len = 1 << s->block_len_bits;
00354
00355 apply_window_and_mdct(avctx, frame);
00356
00357 if (s->ms_stereo) {
00358 float a, b;
00359 int i;
00360
00361 for(i = 0; i < s->block_len; i++) {
00362 a = s->coefs[0][i]*0.5;
00363 b = s->coefs[1][i]*0.5;
00364 s->coefs[0][i] = a + b;
00365 s->coefs[1][i] = a - b;
00366 }
00367 }
00368
00369 if ((ret = ff_alloc_packet2(avctx, avpkt, 2 * MAX_CODED_SUPERFRAME_SIZE)))
00370 return ret;
00371
00372 total_gain= 128;
00373 for(i=64; i; i>>=1){
00374 error = encode_frame(s, s->coefs, avpkt->data, avpkt->size,
00375 total_gain - i);
00376 if(error<=0)
00377 total_gain-= i;
00378 }
00379
00380 while(total_gain <= 128 && error > 0)
00381 error = encode_frame(s, s->coefs, avpkt->data, avpkt->size, total_gain++);
00382 av_assert0((put_bits_count(&s->pb) & 7) == 0);
00383 i= avctx->block_align - (put_bits_count(&s->pb)+7)/8;
00384 av_assert0(i>=0);
00385 while(i--)
00386 put_bits(&s->pb, 8, 'N');
00387
00388 flush_put_bits(&s->pb);
00389 av_assert0(put_bits_ptr(&s->pb) - s->pb.buf == avctx->block_align);
00390
00391 if (frame->pts != AV_NOPTS_VALUE)
00392 avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->delay);
00393
00394 avpkt->size = avctx->block_align;
00395 *got_packet_ptr = 1;
00396 return 0;
00397 }
00398
00399 #if CONFIG_WMAV1_ENCODER
00400 AVCodec ff_wmav1_encoder = {
00401 .name = "wmav1",
00402 .type = AVMEDIA_TYPE_AUDIO,
00403 .id = AV_CODEC_ID_WMAV1,
00404 .priv_data_size = sizeof(WMACodecContext),
00405 .init = encode_init,
00406 .encode2 = encode_superframe,
00407 .close = ff_wma_end,
00408 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
00409 AV_SAMPLE_FMT_NONE },
00410 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
00411 };
00412 #endif
00413 #if CONFIG_WMAV2_ENCODER
00414 AVCodec ff_wmav2_encoder = {
00415 .name = "wmav2",
00416 .type = AVMEDIA_TYPE_AUDIO,
00417 .id = AV_CODEC_ID_WMAV2,
00418 .priv_data_size = sizeof(WMACodecContext),
00419 .init = encode_init,
00420 .encode2 = encode_superframe,
00421 .close = ff_wma_end,
00422 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
00423 AV_SAMPLE_FMT_NONE },
00424 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
00425 };
00426 #endif