forked from KolibriOS/kolibrios
a4b787f4b8
git-svn-id: svn://kolibrios.org@6147 a494cfbc-eb01-0410-851d-a64ba20cac60
183 lines
5.5 KiB
C
183 lines
5.5 KiB
C
/*
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* ADX ADPCM codecs
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* Copyright (c) 2001,2003 BERO
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "adx.h"
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#include "bytestream.h"
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#include "internal.h"
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#include "put_bits.h"
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/**
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* @file
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* SEGA CRI adx codecs.
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*
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* Reference documents:
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* http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
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* adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
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*/
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static void adx_encode(ADXContext *c, uint8_t *adx, const int16_t *wav,
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ADXChannelState *prev, int channels)
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{
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PutBitContext pb;
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int scale;
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int i, j;
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int s0, s1, s2, d;
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int max = 0;
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int min = 0;
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s1 = prev->s1;
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s2 = prev->s2;
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for (i = 0, j = 0; j < 32; i += channels, j++) {
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s0 = wav[i];
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d = ((s0 << COEFF_BITS) - c->coeff[0] * s1 - c->coeff[1] * s2) >> COEFF_BITS;
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if (max < d)
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max = d;
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if (min > d)
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min = d;
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s2 = s1;
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s1 = s0;
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}
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if (max == 0 && min == 0) {
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prev->s1 = s1;
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prev->s2 = s2;
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memset(adx, 0, BLOCK_SIZE);
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return;
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}
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if (max / 7 > -min / 8)
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scale = max / 7;
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else
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scale = -min / 8;
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if (scale == 0)
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scale = 1;
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AV_WB16(adx, scale);
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init_put_bits(&pb, adx + 2, 16);
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s1 = prev->s1;
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s2 = prev->s2;
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for (i = 0, j = 0; j < 32; i += channels, j++) {
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d = ((wav[i] << COEFF_BITS) - c->coeff[0] * s1 - c->coeff[1] * s2) >> COEFF_BITS;
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d = av_clip_intp2(ROUNDED_DIV(d, scale), 3);
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put_sbits(&pb, 4, d);
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s0 = ((d << COEFF_BITS) * scale + c->coeff[0] * s1 + c->coeff[1] * s2) >> COEFF_BITS;
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s2 = s1;
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s1 = s0;
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}
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prev->s1 = s1;
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prev->s2 = s2;
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flush_put_bits(&pb);
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}
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#define HEADER_SIZE 36
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static int adx_encode_header(AVCodecContext *avctx, uint8_t *buf, int bufsize)
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{
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ADXContext *c = avctx->priv_data;
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bytestream_put_be16(&buf, 0x8000); /* header signature */
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bytestream_put_be16(&buf, HEADER_SIZE - 4); /* copyright offset */
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bytestream_put_byte(&buf, 3); /* encoding */
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bytestream_put_byte(&buf, BLOCK_SIZE); /* block size */
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bytestream_put_byte(&buf, 4); /* sample size */
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bytestream_put_byte(&buf, avctx->channels); /* channels */
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bytestream_put_be32(&buf, avctx->sample_rate); /* sample rate */
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bytestream_put_be32(&buf, 0); /* total sample count */
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bytestream_put_be16(&buf, c->cutoff); /* cutoff frequency */
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bytestream_put_byte(&buf, 3); /* version */
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bytestream_put_byte(&buf, 0); /* flags */
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bytestream_put_be32(&buf, 0); /* unknown */
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bytestream_put_be32(&buf, 0); /* loop enabled */
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bytestream_put_be16(&buf, 0); /* padding */
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bytestream_put_buffer(&buf, "(c)CRI", 6); /* copyright signature */
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return HEADER_SIZE;
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}
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static av_cold int adx_encode_init(AVCodecContext *avctx)
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{
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ADXContext *c = avctx->priv_data;
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if (avctx->channels > 2) {
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av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
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return AVERROR(EINVAL);
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}
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avctx->frame_size = BLOCK_SAMPLES;
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/* the cutoff can be adjusted, but this seems to work pretty well */
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c->cutoff = 500;
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ff_adx_calculate_coeffs(c->cutoff, avctx->sample_rate, COEFF_BITS, c->coeff);
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return 0;
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}
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static int adx_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
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const AVFrame *frame, int *got_packet_ptr)
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{
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ADXContext *c = avctx->priv_data;
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const int16_t *samples = (const int16_t *)frame->data[0];
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uint8_t *dst;
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int ch, out_size, ret;
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out_size = BLOCK_SIZE * avctx->channels + !c->header_parsed * HEADER_SIZE;
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if ((ret = ff_alloc_packet2(avctx, avpkt, out_size, 0)) < 0)
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return ret;
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dst = avpkt->data;
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if (!c->header_parsed) {
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int hdrsize;
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if ((hdrsize = adx_encode_header(avctx, dst, avpkt->size)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
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return AVERROR(EINVAL);
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}
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dst += hdrsize;
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c->header_parsed = 1;
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}
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for (ch = 0; ch < avctx->channels; ch++) {
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adx_encode(c, dst, samples + ch, &c->prev[ch], avctx->channels);
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dst += BLOCK_SIZE;
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}
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*got_packet_ptr = 1;
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return 0;
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}
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AVCodec ff_adpcm_adx_encoder = {
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.name = "adpcm_adx",
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.long_name = NULL_IF_CONFIG_SMALL("SEGA CRI ADX ADPCM"),
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.type = AVMEDIA_TYPE_AUDIO,
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.id = AV_CODEC_ID_ADPCM_ADX,
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.priv_data_size = sizeof(ADXContext),
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.init = adx_encode_init,
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.encode2 = adx_encode_frame,
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.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16,
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AV_SAMPLE_FMT_NONE },
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};
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