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/* |
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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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✓✓ |
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for (i = 0, j = 0; j < 32; i += channels, j++) { |
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1058432 |
s0 = wav[i]; |
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d = s0 + ((-c->coeff[0] * s1 - c->coeff[1] * s2) >> COEFF_BITS); |
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✓✓ |
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if (max < d) |
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max = d; |
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✓✓ |
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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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✓✓✗✓
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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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✓✓ |
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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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✓✓ |
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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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✓✓ |
1091508 |
for (i = 0, j = 0; j < 32; i += channels, j++) { |
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d = wav[i] + ((-c->coeff[0] * s1 - c->coeff[1] * s2) >> COEFF_BITS); |
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✓✓ |
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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 * 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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✗✓ |
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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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✓✓ |
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const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL; |
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uint8_t *dst; |
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int ch, out_size, ret; |
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✓✓ |
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if (!samples) { |
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✓✓ |
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if (c->eof) |
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return 0; |
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✗✓ |
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if ((ret = ff_alloc_packet2(avctx, avpkt, 18, 0)) < 0) |
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return ret; |
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c->eof = 1; |
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dst = avpkt->data; |
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bytestream_put_be16(&dst, 0x8001); |
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bytestream_put_be16(&dst, 0x000E); |
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bytestream_put_be64(&dst, 0x0); |
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bytestream_put_be32(&dst, 0x0); |
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bytestream_put_be16(&dst, 0x0); |
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*got_packet_ptr = 1; |
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return 0; |
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} |
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✓✓ |
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out_size = BLOCK_SIZE * avctx->channels + !c->header_parsed * HEADER_SIZE; |
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✗✓ |
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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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✓✓ |
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if (!c->header_parsed) { |
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int hdrsize; |
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✗✓ |
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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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✓✓ |
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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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avpkt->pts = frame->pts; |
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avpkt->duration = frame->nb_samples; |
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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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.capabilities = AV_CODEC_CAP_DELAY, |
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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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}; |