LCOV - code coverage report
Current view: top level - libavcodec - wmaenc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 202 232 87.1 %
Date: 2017-12-11 04:34:20 Functions: 7 7 100.0 %

          Line data    Source code
       1             : /*
       2             :  * WMA compatible encoder
       3             :  * Copyright (c) 2007 Michael Niedermayer
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : #include "libavutil/attributes.h"
      23             : #include "libavutil/ffmath.h"
      24             : 
      25             : #include "avcodec.h"
      26             : #include "internal.h"
      27             : #include "wma.h"
      28             : #include "libavutil/avassert.h"
      29             : 
      30             : 
      31           2 : static av_cold int encode_init(AVCodecContext *avctx)
      32             : {
      33           2 :     WMACodecContext *s = avctx->priv_data;
      34             :     int i, flags1, flags2, block_align;
      35             :     uint8_t *extradata;
      36             :     int ret;
      37             : 
      38           2 :     s->avctx = avctx;
      39             : 
      40           2 :     if (avctx->channels > MAX_CHANNELS) {
      41           0 :         av_log(avctx, AV_LOG_ERROR,
      42             :                "too many channels: got %i, need %i or fewer\n",
      43             :                avctx->channels, MAX_CHANNELS);
      44           0 :         return AVERROR(EINVAL);
      45             :     }
      46             : 
      47           2 :     if (avctx->sample_rate > 48000) {
      48           0 :         av_log(avctx, AV_LOG_ERROR, "sample rate is too high: %d > 48kHz\n",
      49             :                avctx->sample_rate);
      50           0 :         return AVERROR(EINVAL);
      51             :     }
      52             : 
      53           2 :     if (avctx->bit_rate < 24 * 1000) {
      54           0 :         av_log(avctx, AV_LOG_ERROR,
      55             :                "bitrate too low: got %"PRId64", need 24000 or higher\n",
      56             :                avctx->bit_rate);
      57           0 :         return AVERROR(EINVAL);
      58             :     }
      59             : 
      60             :     /* extract flag info */
      61           2 :     flags1 = 0;
      62           2 :     flags2 = 1;
      63           2 :     if (avctx->codec->id == AV_CODEC_ID_WMAV1) {
      64           1 :         extradata             = av_malloc(4);
      65           1 :         if (!extradata)
      66           0 :             return AVERROR(ENOMEM);
      67           1 :         avctx->extradata_size = 4;
      68           1 :         AV_WL16(extradata, flags1);
      69           1 :         AV_WL16(extradata + 2, flags2);
      70           1 :     } else if (avctx->codec->id == AV_CODEC_ID_WMAV2) {
      71           1 :         extradata             = av_mallocz(10);
      72           1 :         if (!extradata)
      73           0 :             return AVERROR(ENOMEM);
      74           1 :         avctx->extradata_size = 10;
      75           1 :         AV_WL32(extradata, flags1);
      76           1 :         AV_WL16(extradata + 4, flags2);
      77             :     } else {
      78           0 :         av_assert0(0);
      79             :     }
      80           2 :     avctx->extradata          = extradata;
      81           2 :     s->use_exp_vlc            = flags2 & 0x0001;
      82           2 :     s->use_bit_reservoir      = flags2 & 0x0002;
      83           2 :     s->use_variable_block_len = flags2 & 0x0004;
      84           2 :     if (avctx->channels == 2)
      85           2 :         s->ms_stereo = 1;
      86             : 
      87           2 :     if ((ret = ff_wma_init(avctx, flags2)) < 0)
      88           0 :         return ret;
      89             : 
      90             :     /* init MDCT */
      91           4 :     for (i = 0; i < s->nb_block_sizes; i++)
      92           2 :         ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 0, 1.0);
      93             : 
      94           4 :     block_align        = avctx->bit_rate * (int64_t) s->frame_len /
      95           2 :                          (avctx->sample_rate * 8);
      96           2 :     block_align        = FFMIN(block_align, MAX_CODED_SUPERFRAME_SIZE);
      97           2 :     avctx->block_align = block_align;
      98           2 :     avctx->frame_size = avctx->initial_padding = s->frame_len;
      99             : 
     100           2 :     return 0;
     101             : }
     102             : 
     103         410 : static int apply_window_and_mdct(AVCodecContext *avctx, const AVFrame *frame)
     104             : {
     105         410 :     WMACodecContext *s = avctx->priv_data;
     106         410 :     float **audio      = (float **) frame->extended_data;
     107         410 :     int len            = frame->nb_samples;
     108         410 :     int window_index   = s->frame_len_bits - s->block_len_bits;
     109         410 :     FFTContext *mdct   = &s->mdct_ctx[window_index];
     110             :     int ch;
     111         410 :     const float *win   = s->windows[window_index];
     112         410 :     int window_len     = 1 << s->block_len_bits;
     113         410 :     float n            = 2.0 * 32768.0 / window_len;
     114             : 
     115        1230 :     for (ch = 0; ch < avctx->channels; ch++) {
     116         820 :         memcpy(s->output, s->frame_out[ch], window_len * sizeof(*s->output));
     117         820 :         s->fdsp->vector_fmul_scalar(s->frame_out[ch], audio[ch], n, len);
     118         820 :         s->fdsp->vector_fmul_reverse(&s->output[window_len], s->frame_out[ch],
     119             :                                     win, len);
     120         820 :         s->fdsp->vector_fmul(s->frame_out[ch], s->frame_out[ch], win, len);
     121         820 :         mdct->mdct_calc(mdct, s->coefs[ch], s->output);
     122         820 :         if (!isfinite(s->coefs[ch][0])) {
     123           0 :             av_log(avctx, AV_LOG_ERROR, "Input contains NaN/+-Inf\n");
     124           0 :             return AVERROR(EINVAL);
     125             :         }
     126             :     }
     127             : 
     128         410 :     return 0;
     129             : }
     130             : 
     131             : // FIXME use for decoding too
     132        6128 : static void init_exp(WMACodecContext *s, int ch, const int *exp_param)
     133             : {
     134             :     int n;
     135             :     const uint16_t *ptr;
     136             :     float v, *q, max_scale, *q_end;
     137             : 
     138        6128 :     ptr       = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
     139        6128 :     q         = s->exponents[ch];
     140        6128 :     q_end     = q + s->block_len;
     141        6128 :     max_scale = 0;
     142      165456 :     while (q < q_end) {
     143             :         /* XXX: use a table */
     144      153200 :         v         = ff_exp10(*exp_param++ *(1.0 / 16.0));
     145      153200 :         max_scale = FFMAX(max_scale, v);
     146      153200 :         n         = *ptr++;
     147             :         do {
     148    12550144 :             *q++ = v;
     149    12550144 :         } while (--n);
     150             :     }
     151        6128 :     s->max_exponent[ch] = max_scale;
     152        6128 : }
     153             : 
     154        6128 : static void encode_exp_vlc(WMACodecContext *s, int ch, const int *exp_param)
     155             : {
     156             :     int last_exp;
     157             :     const uint16_t *ptr;
     158             :     float *q, *q_end;
     159             : 
     160        6128 :     ptr   = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
     161        6128 :     q     = s->exponents[ch];
     162        6128 :     q_end = q + s->block_len;
     163        6128 :     if (s->version == 1) {
     164        3064 :         last_exp = *exp_param++;
     165        3064 :         av_assert0(last_exp - 10 >= 0 && last_exp - 10 < 32);
     166        3064 :         put_bits(&s->pb, 5, last_exp - 10);
     167        3064 :         q += *ptr++;
     168             :     } else
     169        3064 :         last_exp = 36;
     170      162392 :     while (q < q_end) {
     171      150136 :         int exp  = *exp_param++;
     172      150136 :         int code = exp - last_exp + 60;
     173             :         av_assert1(code >= 0 && code < 120);
     174      150136 :         put_bits(&s->pb, ff_aac_scalefactor_bits[code],
     175             :                  ff_aac_scalefactor_code[code]);
     176             :         /* XXX: use a table */
     177      150136 :         q       += *ptr++;
     178      150136 :         last_exp = exp;
     179             :     }
     180        6128 : }
     181             : 
     182        3064 : static int encode_block(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE],
     183             :                         int total_gain)
     184             : {
     185             :     int v, bsize, ch, coef_nb_bits, parse_exponents;
     186             :     float mdct_norm;
     187             :     int nb_coefs[MAX_CHANNELS];
     188             :     static const int fixed_exp[25] = {
     189             :         20, 20, 20, 20, 20,
     190             :         20, 20, 20, 20, 20,
     191             :         20, 20, 20, 20, 20,
     192             :         20, 20, 20, 20, 20,
     193             :         20, 20, 20, 20, 20
     194             :     };
     195             : 
     196             :     // FIXME remove duplication relative to decoder
     197        3064 :     if (s->use_variable_block_len) {
     198           0 :         av_assert0(0); // FIXME not implemented
     199             :     } else {
     200             :         /* fixed block len */
     201        3064 :         s->next_block_len_bits = s->frame_len_bits;
     202        3064 :         s->prev_block_len_bits = s->frame_len_bits;
     203        3064 :         s->block_len_bits      = s->frame_len_bits;
     204             :     }
     205             : 
     206        3064 :     s->block_len = 1 << s->block_len_bits;
     207             : //     av_assert0((s->block_pos + s->block_len) <= s->frame_len);
     208        3064 :     bsize = s->frame_len_bits - s->block_len_bits;
     209             : 
     210             :     // FIXME factor
     211        3064 :     v = s->coefs_end[bsize] - s->coefs_start;
     212        9192 :     for (ch = 0; ch < s->avctx->channels; ch++)
     213        6128 :         nb_coefs[ch] = v;
     214             :     {
     215        3064 :         int n4 = s->block_len / 2;
     216        3064 :         mdct_norm = 1.0 / (float) n4;
     217        3064 :         if (s->version == 1)
     218        1532 :             mdct_norm *= sqrt(n4);
     219             :     }
     220             : 
     221        3064 :     if (s->avctx->channels == 2)
     222        3064 :         put_bits(&s->pb, 1, !!s->ms_stereo);
     223             : 
     224        9192 :     for (ch = 0; ch < s->avctx->channels; ch++) {
     225             :         // FIXME only set channel_coded when needed, instead of always
     226        6128 :         s->channel_coded[ch] = 1;
     227        6128 :         if (s->channel_coded[ch])
     228        6128 :             init_exp(s, ch, fixed_exp);
     229             :     }
     230             : 
     231        9192 :     for (ch = 0; ch < s->avctx->channels; ch++) {
     232        6128 :         if (s->channel_coded[ch]) {
     233             :             WMACoef *coefs1;
     234             :             float *coefs, *exponents, mult;
     235             :             int i, n;
     236             : 
     237        6128 :             coefs1    = s->coefs1[ch];
     238        6128 :             exponents = s->exponents[ch];
     239        6128 :             mult      = ff_exp10(total_gain * 0.05) / s->max_exponent[ch];
     240        6128 :             mult     *= mdct_norm;
     241        6128 :             coefs     = src_coefs[ch];
     242             :             if (s->use_noise_coding && 0) {
     243             :                 av_assert0(0); // FIXME not implemented
     244             :             } else {
     245        6128 :                 coefs += s->coefs_start;
     246        6128 :                 n      = nb_coefs[ch];
     247    11419528 :                 for (i = 0; i < n; i++) {
     248    11413400 :                     double t = *coefs++ / (exponents[i] * mult);
     249    11413400 :                     if (t < -32768 || t > 32767)
     250           0 :                         return -1;
     251             : 
     252    11413400 :                     coefs1[i] = lrint(t);
     253             :                 }
     254             :             }
     255             :         }
     256             :     }
     257             : 
     258        3064 :     v = 0;
     259        9192 :     for (ch = 0; ch < s->avctx->channels; ch++) {
     260        6128 :         int a = s->channel_coded[ch];
     261        6128 :         put_bits(&s->pb, 1, a);
     262        6128 :         v |= a;
     263             :     }
     264             : 
     265        3064 :     if (!v)
     266           0 :         return 1;
     267             : 
     268        3064 :     for (v = total_gain - 1; v >= 127; v -= 127)
     269           0 :         put_bits(&s->pb, 7, 127);
     270        3064 :     put_bits(&s->pb, 7, v);
     271             : 
     272        3064 :     coef_nb_bits = ff_wma_total_gain_to_bits(total_gain);
     273             : 
     274        3064 :     if (s->use_noise_coding) {
     275           0 :         for (ch = 0; ch < s->avctx->channels; ch++) {
     276           0 :             if (s->channel_coded[ch]) {
     277             :                 int i, n;
     278           0 :                 n = s->exponent_high_sizes[bsize];
     279           0 :                 for (i = 0; i < n; i++) {
     280           0 :                     put_bits(&s->pb, 1, s->high_band_coded[ch][i] = 0);
     281             :                     if (0)
     282             :                         nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
     283             :                 }
     284             :             }
     285             :         }
     286             :     }
     287             : 
     288        3064 :     parse_exponents = 1;
     289        3064 :     if (s->block_len_bits != s->frame_len_bits)
     290           0 :         put_bits(&s->pb, 1, parse_exponents);
     291             : 
     292        3064 :     if (parse_exponents) {
     293        9192 :         for (ch = 0; ch < s->avctx->channels; ch++) {
     294        6128 :             if (s->channel_coded[ch]) {
     295        6128 :                 if (s->use_exp_vlc) {
     296        6128 :                     encode_exp_vlc(s, ch, fixed_exp);
     297             :                 } else {
     298           0 :                     av_assert0(0); // FIXME not implemented
     299             : //                    encode_exp_lsp(s, ch);
     300             :                 }
     301             :             }
     302             :         }
     303             :     } else
     304           0 :         av_assert0(0); // FIXME not implemented
     305             : 
     306        8435 :     for (ch = 0; ch < s->avctx->channels; ch++) {
     307        5755 :         if (s->channel_coded[ch]) {
     308             :             int run, tindex;
     309             :             WMACoef *ptr, *eptr;
     310        5755 :             tindex = (ch == 1 && s->ms_stereo);
     311        5755 :             ptr    = &s->coefs1[ch][0];
     312        5755 :             eptr   = ptr + nb_coefs[ch];
     313             : 
     314        5755 :             run = 0;
     315    10012817 :             for (; ptr < eptr; ptr++) {
     316    10007446 :                 if (*ptr) {
     317     2918406 :                     int level     = *ptr;
     318     2918406 :                     int abs_level = FFABS(level);
     319     2918406 :                     int code      = 0;
     320     2918406 :                     if (abs_level <= s->coef_vlcs[tindex]->max_level)
     321     2889049 :                         if (run < s->coef_vlcs[tindex]->levels[abs_level - 1])
     322     2884295 :                             code = run + s->int_table[tindex][abs_level - 1];
     323             : 
     324             :                     av_assert2(code < s->coef_vlcs[tindex]->n);
     325     2918406 :                     put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[code],
     326     2918406 :                              s->coef_vlcs[tindex]->huffcodes[code]);
     327             : 
     328     2918406 :                     if (code == 0) {
     329       34111 :                         if (1 << coef_nb_bits <= abs_level)
     330         384 :                             return -1;
     331             : 
     332       33727 :                         put_bits(&s->pb, coef_nb_bits, abs_level);
     333       33727 :                         put_bits(&s->pb, s->frame_len_bits, run);
     334             :                     }
     335             :                     // FIXME the sign is flipped somewhere
     336     2918022 :                     put_bits(&s->pb, 1, level < 0);
     337     2918022 :                     run = 0;
     338             :                 } else
     339     7089040 :                     run++;
     340             :             }
     341        5371 :             if (run)
     342        5152 :                 put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[1],
     343        5152 :                          s->coef_vlcs[tindex]->huffcodes[1]);
     344             :         }
     345        5371 :         if (s->version == 1 && s->avctx->channels >= 2)
     346        2803 :             avpriv_align_put_bits(&s->pb);
     347             :     }
     348        2680 :     return 0;
     349             : }
     350             : 
     351        3064 : static int encode_frame(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE],
     352             :                         uint8_t *buf, int buf_size, int total_gain)
     353             : {
     354        3064 :     init_put_bits(&s->pb, buf, buf_size);
     355             : 
     356        3064 :     if (s->use_bit_reservoir)
     357           0 :         av_assert0(0); // FIXME not implemented
     358        3064 :     else if (encode_block(s, src_coefs, total_gain) < 0)
     359         384 :         return INT_MAX;
     360             : 
     361        2680 :     avpriv_align_put_bits(&s->pb);
     362             : 
     363        2680 :     return put_bits_count(&s->pb) / 8 - s->avctx->block_align;
     364             : }
     365             : 
     366         410 : static int encode_superframe(AVCodecContext *avctx, AVPacket *avpkt,
     367             :                              const AVFrame *frame, int *got_packet_ptr)
     368             : {
     369         410 :     WMACodecContext *s = avctx->priv_data;
     370             :     int i, total_gain, ret, error;
     371             : 
     372         410 :     s->block_len_bits = s->frame_len_bits; // required by non variable block len
     373         410 :     s->block_len      = 1 << s->block_len_bits;
     374             : 
     375         410 :     ret = apply_window_and_mdct(avctx, frame);
     376             : 
     377         410 :     if (ret < 0)
     378           0 :         return ret;
     379             : 
     380         410 :     if (s->ms_stereo) {
     381             :         float a, b;
     382             :         int i;
     383             : 
     384      840090 :         for (i = 0; i < s->block_len; i++) {
     385      839680 :             a              = s->coefs[0][i] * 0.5;
     386      839680 :             b              = s->coefs[1][i] * 0.5;
     387      839680 :             s->coefs[0][i] = a + b;
     388      839680 :             s->coefs[1][i] = a - b;
     389             :         }
     390             :     }
     391             : 
     392         410 :     if ((ret = ff_alloc_packet2(avctx, avpkt, 2 * MAX_CODED_SUPERFRAME_SIZE, 0)) < 0)
     393           0 :         return ret;
     394             : 
     395         410 :     total_gain = 128;
     396        3280 :     for (i = 64; i; i >>= 1) {
     397        2870 :         error = encode_frame(s, s->coefs, avpkt->data, avpkt->size,
     398             :                                  total_gain - i);
     399        2870 :         if (error <= 0)
     400        1331 :             total_gain -= i;
     401             :     }
     402             : 
     403        1014 :     while(total_gain <= 128 && error > 0)
     404         194 :         error = encode_frame(s, s->coefs, avpkt->data, avpkt->size, total_gain++);
     405         410 :     if (error > 0) {
     406           0 :         av_log(avctx, AV_LOG_ERROR, "Invalid input data or requested bitrate too low, cannot encode\n");
     407           0 :         avpkt->size = 0;
     408           0 :         return AVERROR(EINVAL);
     409             :     }
     410         410 :     av_assert0((put_bits_count(&s->pb) & 7) == 0);
     411         410 :     i= avctx->block_align - (put_bits_count(&s->pb)+7)/8;
     412         410 :     av_assert0(i>=0);
     413       22570 :     while(i--)
     414       21750 :         put_bits(&s->pb, 8, 'N');
     415             : 
     416         410 :     flush_put_bits(&s->pb);
     417         410 :     av_assert0(put_bits_ptr(&s->pb) - s->pb.buf == avctx->block_align);
     418             : 
     419         410 :     if (frame->pts != AV_NOPTS_VALUE)
     420         410 :         avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding);
     421             : 
     422         410 :     avpkt->size     = avctx->block_align;
     423         410 :     *got_packet_ptr = 1;
     424         410 :     return 0;
     425             : }
     426             : 
     427             : #if CONFIG_WMAV1_ENCODER
     428             : AVCodec ff_wmav1_encoder = {
     429             :     .name           = "wmav1",
     430             :     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
     431             :     .type           = AVMEDIA_TYPE_AUDIO,
     432             :     .id             = AV_CODEC_ID_WMAV1,
     433             :     .priv_data_size = sizeof(WMACodecContext),
     434             :     .init           = encode_init,
     435             :     .encode2        = encode_superframe,
     436             :     .close          = ff_wma_end,
     437             :     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
     438             :                                                       AV_SAMPLE_FMT_NONE },
     439             : };
     440             : #endif
     441             : #if CONFIG_WMAV2_ENCODER
     442             : AVCodec ff_wmav2_encoder = {
     443             :     .name           = "wmav2",
     444             :     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
     445             :     .type           = AVMEDIA_TYPE_AUDIO,
     446             :     .id             = AV_CODEC_ID_WMAV2,
     447             :     .priv_data_size = sizeof(WMACodecContext),
     448             :     .init           = encode_init,
     449             :     .encode2        = encode_superframe,
     450             :     .close          = ff_wma_end,
     451             :     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
     452             :                                                       AV_SAMPLE_FMT_NONE },
     453             : };
     454             : #endif

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