LCOV - code coverage report
Current view: top level - src/libavcodec - adxenc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 74 83 89.2 %
Date: 2017-04-29 01:39:13 Functions: 4 4 100.0 %

          Line data    Source code
       1             : /*
       2             :  * ADX ADPCM codecs
       3             :  * Copyright (c) 2001,2003 BERO
       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 "avcodec.h"
      23             : #include "adx.h"
      24             : #include "bytestream.h"
      25             : #include "internal.h"
      26             : #include "put_bits.h"
      27             : 
      28             : /**
      29             :  * @file
      30             :  * SEGA CRI adx codecs.
      31             :  *
      32             :  * Reference documents:
      33             :  * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
      34             :  * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
      35             :  */
      36             : 
      37       33076 : static void adx_encode(ADXContext *c, uint8_t *adx, const int16_t *wav,
      38             :                        ADXChannelState *prev, int channels)
      39             : {
      40             :     PutBitContext pb;
      41             :     int scale;
      42             :     int i, j;
      43             :     int s0, s1, s2, d;
      44       33076 :     int max = 0;
      45       33076 :     int min = 0;
      46             : 
      47       33076 :     s1 = prev->s1;
      48       33076 :     s2 = prev->s2;
      49     1091508 :     for (i = 0, j = 0; j < 32; i += channels, j++) {
      50     1058432 :         s0 = wav[i];
      51     1058432 :         d = ((s0 << COEFF_BITS) - c->coeff[0] * s1 - c->coeff[1] * s2) >> COEFF_BITS;
      52     1058432 :         if (max < d)
      53      189764 :             max = d;
      54     1058432 :         if (min > d)
      55      192954 :             min = d;
      56     1058432 :         s2 = s1;
      57     1058432 :         s1 = s0;
      58             :     }
      59             : 
      60       33076 :     if (max == 0 && min == 0) {
      61           0 :         prev->s1 = s1;
      62           0 :         prev->s2 = s2;
      63           0 :         memset(adx, 0, BLOCK_SIZE);
      64           0 :         return;
      65             :     }
      66             : 
      67       33076 :     if (max / 7 > -min / 8)
      68       27914 :         scale = max / 7;
      69             :     else
      70        5162 :         scale = -min / 8;
      71             : 
      72       33076 :     if (scale == 0)
      73         998 :         scale = 1;
      74             : 
      75       33076 :     AV_WB16(adx, scale);
      76             : 
      77       33076 :     init_put_bits(&pb, adx + 2, 16);
      78             : 
      79       33076 :     s1 = prev->s1;
      80       33076 :     s2 = prev->s2;
      81     1091508 :     for (i = 0, j = 0; j < 32; i += channels, j++) {
      82     1058432 :         d = ((wav[i] << COEFF_BITS) - c->coeff[0] * s1 - c->coeff[1] * s2) >> COEFF_BITS;
      83             : 
      84     1058432 :         d = av_clip_intp2(ROUNDED_DIV(d, scale), 3);
      85             : 
      86     1058432 :         put_sbits(&pb, 4, d);
      87             : 
      88     1058432 :         s0 = ((d << COEFF_BITS) * scale + c->coeff[0] * s1 + c->coeff[1] * s2) >> COEFF_BITS;
      89     1058432 :         s2 = s1;
      90     1058432 :         s1 = s0;
      91             :     }
      92       33076 :     prev->s1 = s1;
      93       33076 :     prev->s2 = s2;
      94             : 
      95       33076 :     flush_put_bits(&pb);
      96             : }
      97             : 
      98             : #define HEADER_SIZE 36
      99             : 
     100           2 : static int adx_encode_header(AVCodecContext *avctx, uint8_t *buf, int bufsize)
     101             : {
     102           2 :     ADXContext *c = avctx->priv_data;
     103             : 
     104           2 :     bytestream_put_be16(&buf, 0x8000);              /* header signature */
     105           2 :     bytestream_put_be16(&buf, HEADER_SIZE - 4);     /* copyright offset */
     106           2 :     bytestream_put_byte(&buf, 3);                   /* encoding */
     107           2 :     bytestream_put_byte(&buf, BLOCK_SIZE);          /* block size */
     108           2 :     bytestream_put_byte(&buf, 4);                   /* sample size */
     109           2 :     bytestream_put_byte(&buf, avctx->channels);     /* channels */
     110           2 :     bytestream_put_be32(&buf, avctx->sample_rate);  /* sample rate */
     111           2 :     bytestream_put_be32(&buf, 0);                   /* total sample count */
     112           2 :     bytestream_put_be16(&buf, c->cutoff);           /* cutoff frequency */
     113           2 :     bytestream_put_byte(&buf, 3);                   /* version */
     114           2 :     bytestream_put_byte(&buf, 0);                   /* flags */
     115           2 :     bytestream_put_be32(&buf, 0);                   /* unknown */
     116           2 :     bytestream_put_be32(&buf, 0);                   /* loop enabled */
     117           2 :     bytestream_put_be16(&buf, 0);                   /* padding */
     118           2 :     bytestream_put_buffer(&buf, "(c)CRI", 6);       /* copyright signature */
     119             : 
     120           2 :     return HEADER_SIZE;
     121             : }
     122             : 
     123           2 : static av_cold int adx_encode_init(AVCodecContext *avctx)
     124             : {
     125           2 :     ADXContext *c = avctx->priv_data;
     126             : 
     127           2 :     if (avctx->channels > 2) {
     128           0 :         av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
     129           0 :         return AVERROR(EINVAL);
     130             :     }
     131           2 :     avctx->frame_size = BLOCK_SAMPLES;
     132             : 
     133             :     /* the cutoff can be adjusted, but this seems to work pretty well */
     134           2 :     c->cutoff = 500;
     135           2 :     ff_adx_calculate_coeffs(c->cutoff, avctx->sample_rate, COEFF_BITS, c->coeff);
     136             : 
     137           2 :     return 0;
     138             : }
     139             : 
     140       16538 : static int adx_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
     141             :                             const AVFrame *frame, int *got_packet_ptr)
     142             : {
     143       16538 :     ADXContext *c          = avctx->priv_data;
     144       16538 :     const int16_t *samples = (const int16_t *)frame->data[0];
     145             :     uint8_t *dst;
     146             :     int ch, out_size, ret;
     147             : 
     148       16538 :     out_size = BLOCK_SIZE * avctx->channels + !c->header_parsed * HEADER_SIZE;
     149       16538 :     if ((ret = ff_alloc_packet2(avctx, avpkt, out_size, 0)) < 0)
     150           0 :         return ret;
     151       16538 :     dst = avpkt->data;
     152             : 
     153       16538 :     if (!c->header_parsed) {
     154             :         int hdrsize;
     155           2 :         if ((hdrsize = adx_encode_header(avctx, dst, avpkt->size)) < 0) {
     156           0 :             av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
     157           0 :             return AVERROR(EINVAL);
     158             :         }
     159           2 :         dst      += hdrsize;
     160           2 :         c->header_parsed = 1;
     161             :     }
     162             : 
     163       49614 :     for (ch = 0; ch < avctx->channels; ch++) {
     164       33076 :         adx_encode(c, dst, samples + ch, &c->prev[ch], avctx->channels);
     165       33076 :         dst += BLOCK_SIZE;
     166             :     }
     167             : 
     168       16538 :     *got_packet_ptr = 1;
     169       16538 :     return 0;
     170             : }
     171             : 
     172             : AVCodec ff_adpcm_adx_encoder = {
     173             :     .name           = "adpcm_adx",
     174             :     .long_name      = NULL_IF_CONFIG_SMALL("SEGA CRI ADX ADPCM"),
     175             :     .type           = AVMEDIA_TYPE_AUDIO,
     176             :     .id             = AV_CODEC_ID_ADPCM_ADX,
     177             :     .priv_data_size = sizeof(ADXContext),
     178             :     .init           = adx_encode_init,
     179             :     .encode2        = adx_encode_frame,
     180             :     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16,
     181             :                                                       AV_SAMPLE_FMT_NONE },
     182             : };

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