LCOV - code coverage report
Current view: top level - libavcodec - nellymoserdec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 70 76 92.1 %
Date: 2017-12-12 11:08:38 Functions: 4 4 100.0 %

          Line data    Source code
       1             : /*
       2             :  * NellyMoser audio decoder
       3             :  * Copyright (c) 2007 a840bda5870ba11f19698ff6eb9581dfb0f95fa5,
       4             :  *                    539459aeb7d425140b62a3ec7dbf6dc8e408a306, and
       5             :  *                    520e17cd55896441042b14df2566a6eb610ed444
       6             :  * Copyright (c) 2007 Loic Minier <lool at dooz.org>
       7             :  *                    Benjamin Larsson
       8             :  *
       9             :  * Permission is hereby granted, free of charge, to any person obtaining a
      10             :  * copy of this software and associated documentation files (the "Software"),
      11             :  * to deal in the Software without restriction, including without limitation
      12             :  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      13             :  * and/or sell copies of the Software, and to permit persons to whom the
      14             :  * Software is furnished to do so, subject to the following conditions:
      15             :  *
      16             :  * The above copyright notice and this permission notice shall be included in
      17             :  * all copies or substantial portions of the Software.
      18             :  *
      19             :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
      20             :  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      21             :  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
      22             :  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      23             :  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
      24             :  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
      25             :  * DEALINGS IN THE SOFTWARE.
      26             :  */
      27             : 
      28             : /**
      29             :  * @file
      30             :  * The 3 alphanumeric copyright notices are md5summed they are from the original
      31             :  * implementors. The original code is available from http://code.google.com/p/nelly2pcm/
      32             :  */
      33             : 
      34             : #include "libavutil/channel_layout.h"
      35             : #include "libavutil/float_dsp.h"
      36             : #include "libavutil/lfg.h"
      37             : #include "libavutil/random_seed.h"
      38             : 
      39             : #define BITSTREAM_READER_LE
      40             : #include "avcodec.h"
      41             : #include "fft.h"
      42             : #include "get_bits.h"
      43             : #include "internal.h"
      44             : #include "nellymoser.h"
      45             : #include "sinewin.h"
      46             : 
      47             : 
      48             : typedef struct NellyMoserDecodeContext {
      49             :     AVCodecContext* avctx;
      50             :     AVLFG           random_state;
      51             :     GetBitContext   gb;
      52             :     float           scale_bias;
      53             :     AVFloatDSPContext *fdsp;
      54             :     FFTContext      imdct_ctx;
      55             :     DECLARE_ALIGNED(32, float, imdct_buf)[2][NELLY_BUF_LEN];
      56             :     float          *imdct_out;
      57             :     float          *imdct_prev;
      58             : } NellyMoserDecodeContext;
      59             : 
      60        2799 : static void nelly_decode_block(NellyMoserDecodeContext *s,
      61             :                                const unsigned char block[NELLY_BLOCK_LEN],
      62             :                                float audio[NELLY_SAMPLES])
      63             : {
      64             :     int i,j;
      65             :     float buf[NELLY_FILL_LEN], pows[NELLY_FILL_LEN];
      66             :     float *aptr, *bptr, *pptr, val, pval;
      67             :     int bits[NELLY_BUF_LEN];
      68             :     unsigned char v;
      69             : 
      70        2799 :     init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8);
      71             : 
      72        2799 :     bptr = buf;
      73        2799 :     pptr = pows;
      74        2799 :     val = ff_nelly_init_table[get_bits(&s->gb, 6)];
      75       67176 :     for (i=0 ; i<NELLY_BANDS ; i++) {
      76       64377 :         if (i > 0)
      77       61578 :             val += ff_nelly_delta_table[get_bits(&s->gb, 5)];
      78       64377 :         pval = -exp2(val/2048) * s->scale_bias;
      79      411453 :         for (j = 0; j < ff_nelly_band_sizes_table[i]; j++) {
      80      347076 :             *bptr++ = val;
      81      347076 :             *pptr++ = pval;
      82             :         }
      83             : 
      84             :     }
      85             : 
      86        2799 :     ff_nelly_get_sample_bits(buf, bits);
      87             : 
      88        8397 :     for (i = 0; i < 2; i++) {
      89        5598 :         aptr = audio + i * NELLY_BUF_LEN;
      90             : 
      91        5598 :         init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8);
      92        5598 :         skip_bits_long(&s->gb, NELLY_HEADER_BITS + i*NELLY_DETAIL_BITS);
      93             : 
      94      699750 :         for (j = 0; j < NELLY_FILL_LEN; j++) {
      95      694152 :             if (bits[j] <= 0) {
      96      193312 :                 aptr[j] = M_SQRT1_2*pows[j];
      97      193312 :                 if (av_lfg_get(&s->random_state) & 1)
      98       96845 :                     aptr[j] *= -1.0;
      99             :             } else {
     100      500840 :                 v = get_bits(&s->gb, bits[j]);
     101      500840 :                 aptr[j] = ff_nelly_dequantization_table[(1<<bits[j])-1+v]*pows[j];
     102             :             }
     103             :         }
     104        5598 :         memset(&aptr[NELLY_FILL_LEN], 0,
     105             :                (NELLY_BUF_LEN - NELLY_FILL_LEN) * sizeof(float));
     106             : 
     107        5598 :         s->imdct_ctx.imdct_half(&s->imdct_ctx, s->imdct_out, aptr);
     108       11196 :         s->fdsp->vector_fmul_window(aptr, s->imdct_prev + NELLY_BUF_LEN / 2,
     109        5598 :                                    s->imdct_out, ff_sine_128,
     110             :                                    NELLY_BUF_LEN / 2);
     111        5598 :         FFSWAP(float *, s->imdct_out, s->imdct_prev);
     112             :     }
     113        2799 : }
     114             : 
     115           6 : static av_cold int decode_init(AVCodecContext * avctx) {
     116           6 :     NellyMoserDecodeContext *s = avctx->priv_data;
     117             : 
     118           6 :     s->avctx = avctx;
     119           6 :     s->imdct_out = s->imdct_buf[0];
     120           6 :     s->imdct_prev = s->imdct_buf[1];
     121           6 :     av_lfg_init(&s->random_state, 0);
     122           6 :     ff_mdct_init(&s->imdct_ctx, 8, 1, 1.0);
     123             : 
     124           6 :     s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
     125           6 :     if (!s->fdsp)
     126           0 :         return AVERROR(ENOMEM);
     127             : 
     128           6 :     s->scale_bias = 1.0/(32768*8);
     129           6 :     avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
     130             : 
     131             :     /* Generate overlap window */
     132           6 :     if (!ff_sine_128[127])
     133           3 :         ff_init_ff_sine_windows(7);
     134             : 
     135           6 :     avctx->channels       = 1;
     136           6 :     avctx->channel_layout = AV_CH_LAYOUT_MONO;
     137             : 
     138           6 :     return 0;
     139             : }
     140             : 
     141        1698 : static int decode_tag(AVCodecContext *avctx, void *data,
     142             :                       int *got_frame_ptr, AVPacket *avpkt)
     143             : {
     144        1698 :     AVFrame *frame     = data;
     145        1698 :     const uint8_t *buf = avpkt->data;
     146        1698 :     const uint8_t *side=av_packet_get_side_data(avpkt, 'F', NULL);
     147        1698 :     int buf_size = avpkt->size;
     148        1698 :     NellyMoserDecodeContext *s = avctx->priv_data;
     149             :     int blocks, i, ret;
     150             :     float   *samples_flt;
     151             : 
     152        1698 :     blocks     = buf_size / NELLY_BLOCK_LEN;
     153             : 
     154        1698 :     if (blocks <= 0) {
     155           0 :         av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
     156           0 :         return AVERROR_INVALIDDATA;
     157             :     }
     158             : 
     159        1698 :     if (buf_size % NELLY_BLOCK_LEN) {
     160           0 :         av_log(avctx, AV_LOG_WARNING, "Leftover bytes: %d.\n",
     161             :                buf_size % NELLY_BLOCK_LEN);
     162             :     }
     163             :     /* Normal numbers of blocks for sample rates:
     164             :      *  8000 Hz - 1
     165             :      * 11025 Hz - 2
     166             :      * 16000 Hz - 3
     167             :      * 22050 Hz - 4
     168             :      * 44100 Hz - 8
     169             :      */
     170        1698 :     if(side && blocks>1 && avctx->sample_rate%11025==0 && (1<<((side[0]>>2)&3)) == blocks)
     171           0 :         avctx->sample_rate= 11025*(blocks/2);
     172             : 
     173             :     /* get output buffer */
     174        1698 :     frame->nb_samples = NELLY_SAMPLES * blocks;
     175        1698 :     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
     176           0 :         return ret;
     177        1698 :     samples_flt = (float *)frame->data[0];
     178             : 
     179        4497 :     for (i=0 ; i<blocks ; i++) {
     180        2799 :         nelly_decode_block(s, buf, samples_flt);
     181        2799 :         samples_flt += NELLY_SAMPLES;
     182        2799 :         buf += NELLY_BLOCK_LEN;
     183             :     }
     184             : 
     185        1698 :     *got_frame_ptr = 1;
     186             : 
     187        1698 :     return buf_size;
     188             : }
     189             : 
     190           6 : static av_cold int decode_end(AVCodecContext * avctx) {
     191           6 :     NellyMoserDecodeContext *s = avctx->priv_data;
     192             : 
     193           6 :     ff_mdct_end(&s->imdct_ctx);
     194           6 :     av_freep(&s->fdsp);
     195             : 
     196           6 :     return 0;
     197             : }
     198             : 
     199             : AVCodec ff_nellymoser_decoder = {
     200             :     .name           = "nellymoser",
     201             :     .long_name      = NULL_IF_CONFIG_SMALL("Nellymoser Asao"),
     202             :     .type           = AVMEDIA_TYPE_AUDIO,
     203             :     .id             = AV_CODEC_ID_NELLYMOSER,
     204             :     .priv_data_size = sizeof(NellyMoserDecodeContext),
     205             :     .init           = decode_init,
     206             :     .close          = decode_end,
     207             :     .decode         = decode_tag,
     208             :     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_PARAM_CHANGE,
     209             :     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLT,
     210             :                                                       AV_SAMPLE_FMT_NONE },
     211             : };

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