LCOV - code coverage report
Current view: top level - libavcodec - ra144dec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 51 52 98.1 %
Date: 2017-12-13 18:07:29 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Real Audio 1.0 (14.4K)
       3             :  *
       4             :  * Copyright (c) 2008 Vitor Sessak
       5             :  * Copyright (c) 2003 Nick Kurshev
       6             :  *     Based on public domain decoder at http://www.honeypot.net/audio
       7             :  *
       8             :  * This file is part of FFmpeg.
       9             :  *
      10             :  * FFmpeg is free software; you can redistribute it and/or
      11             :  * modify it under the terms of the GNU Lesser General Public
      12             :  * License as published by the Free Software Foundation; either
      13             :  * version 2.1 of the License, or (at your option) any later version.
      14             :  *
      15             :  * FFmpeg is distributed in the hope that it will be useful,
      16             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      17             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      18             :  * Lesser General Public License for more details.
      19             :  *
      20             :  * You should have received a copy of the GNU Lesser General Public
      21             :  * License along with FFmpeg; if not, write to the Free Software
      22             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      23             :  */
      24             : 
      25             : #include "libavutil/channel_layout.h"
      26             : #include "avcodec.h"
      27             : #include "get_bits.h"
      28             : #include "internal.h"
      29             : #include "ra144.h"
      30             : 
      31             : 
      32           6 : static av_cold int ra144_decode_init(AVCodecContext * avctx)
      33             : {
      34           6 :     RA144Context *ractx = avctx->priv_data;
      35             : 
      36           6 :     ractx->avctx = avctx;
      37           6 :     ff_audiodsp_init(&ractx->adsp);
      38             : 
      39           6 :     ractx->lpc_coef[0] = ractx->lpc_tables[0];
      40           6 :     ractx->lpc_coef[1] = ractx->lpc_tables[1];
      41             : 
      42           6 :     avctx->channels       = 1;
      43           6 :     avctx->channel_layout = AV_CH_LAYOUT_MONO;
      44           6 :     avctx->sample_fmt     = AV_SAMPLE_FMT_S16;
      45             : 
      46           6 :     return 0;
      47             : }
      48             : 
      49       23172 : static void do_output_subblock(RA144Context *ractx, const int16_t  *lpc_coefs,
      50             :                                int gval, GetBitContext *gb)
      51             : {
      52       23172 :     int cba_idx = get_bits(gb, 7); // index of the adaptive CB, 0 if none
      53       23172 :     int gain    = get_bits(gb, 8);
      54       23172 :     int cb1_idx = get_bits(gb, 7);
      55       23172 :     int cb2_idx = get_bits(gb, 7);
      56             : 
      57       23172 :     ff_subblock_synthesis(ractx, lpc_coefs, cba_idx, cb1_idx, cb2_idx, gval,
      58             :                           gain);
      59       23172 : }
      60             : 
      61             : /** Uncompress one block (20 bytes -> 160*2 bytes). */
      62        5794 : static int ra144_decode_frame(AVCodecContext * avctx, void *data,
      63             :                               int *got_frame_ptr, AVPacket *avpkt)
      64             : {
      65        5794 :     AVFrame *frame     = data;
      66        5794 :     const uint8_t *buf = avpkt->data;
      67        5794 :     int buf_size = avpkt->size;
      68             :     static const uint8_t sizes[LPC_ORDER] = {6, 5, 5, 4, 4, 3, 3, 3, 3, 2};
      69             :     unsigned int refl_rms[NBLOCKS];           // RMS of the reflection coefficients
      70             :     int16_t block_coefs[NBLOCKS][LPC_ORDER];  // LPC coefficients of each sub-block
      71             :     unsigned int lpc_refl[LPC_ORDER];         // LPC reflection coefficients of the frame
      72             :     int i, j;
      73             :     int ret;
      74             :     int16_t *samples;
      75             :     unsigned int energy;
      76             : 
      77        5794 :     RA144Context *ractx = avctx->priv_data;
      78             :     GetBitContext gb;
      79             : 
      80        5794 :     if (buf_size < FRAME_SIZE) {
      81           1 :         av_log(avctx, AV_LOG_ERROR,
      82             :                "Frame too small (%d bytes). Truncated file?\n", buf_size);
      83           1 :         *got_frame_ptr = 0;
      84           1 :         return AVERROR_INVALIDDATA;
      85             :     }
      86             : 
      87             :     /* get output buffer */
      88        5793 :     frame->nb_samples = NBLOCKS * BLOCKSIZE;
      89        5793 :     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
      90           0 :         return ret;
      91        5793 :     samples = (int16_t *)frame->data[0];
      92             : 
      93        5793 :     init_get_bits8(&gb, buf, FRAME_SIZE);
      94             : 
      95       63723 :     for (i = 0; i < LPC_ORDER; i++)
      96       57930 :         lpc_refl[i] = ff_lpc_refl_cb[i][get_bits(&gb, sizes[i])];
      97             : 
      98        5793 :     ff_eval_coefs(ractx->lpc_coef[0], lpc_refl);
      99        5793 :     ractx->lpc_refl_rms[0] = ff_rms(lpc_refl);
     100             : 
     101        5793 :     energy = ff_energy_tab[get_bits(&gb, 5)];
     102             : 
     103        5793 :     refl_rms[0] = ff_interp(ractx, block_coefs[0], 1, 1, ractx->old_energy);
     104       11586 :     refl_rms[1] = ff_interp(ractx, block_coefs[1], 2,
     105        5793 :                             energy <= ractx->old_energy,
     106        5793 :                             ff_t_sqrt(energy*ractx->old_energy) >> 12);
     107        5793 :     refl_rms[2] = ff_interp(ractx, block_coefs[2], 3, 0, energy);
     108        5793 :     refl_rms[3] = ff_rescale_rms(ractx->lpc_refl_rms[0], energy);
     109             : 
     110        5793 :     ff_int_to_int16(block_coefs[3], ractx->lpc_coef[0]);
     111             : 
     112       28965 :     for (i=0; i < NBLOCKS; i++) {
     113       23172 :         do_output_subblock(ractx, block_coefs[i], refl_rms[i], &gb);
     114             : 
     115      950052 :         for (j=0; j < BLOCKSIZE; j++)
     116      926880 :             *samples++ = av_clip_int16(ractx->curr_sblock[j + 10] * (1 << 2));
     117             :     }
     118             : 
     119        5793 :     ractx->old_energy = energy;
     120        5793 :     ractx->lpc_refl_rms[1] = ractx->lpc_refl_rms[0];
     121             : 
     122        5793 :     FFSWAP(unsigned int *, ractx->lpc_coef[0], ractx->lpc_coef[1]);
     123             : 
     124        5793 :     *got_frame_ptr = 1;
     125             : 
     126        5793 :     return FRAME_SIZE;
     127             : }
     128             : 
     129             : AVCodec ff_ra_144_decoder = {
     130             :     .name           = "real_144",
     131             :     .long_name      = NULL_IF_CONFIG_SMALL("RealAudio 1.0 (14.4K)"),
     132             :     .type           = AVMEDIA_TYPE_AUDIO,
     133             :     .id             = AV_CODEC_ID_RA_144,
     134             :     .priv_data_size = sizeof(RA144Context),
     135             :     .init           = ra144_decode_init,
     136             :     .decode         = ra144_decode_frame,
     137             :     .capabilities   = AV_CODEC_CAP_DR1,
     138             : };

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