diff options
Diffstat (limited to 'ffmpeg/libavcodec/adxenc.c')
| -rw-r--r-- | ffmpeg/libavcodec/adxenc.c | 169 |
1 files changed, 0 insertions, 169 deletions
diff --git a/ffmpeg/libavcodec/adxenc.c b/ffmpeg/libavcodec/adxenc.c deleted file mode 100644 index 05e3245..0000000 --- a/ffmpeg/libavcodec/adxenc.c +++ /dev/null @@ -1,169 +0,0 @@ -/* - * ADX ADPCM codecs - * Copyright (c) 2001,2003 BERO - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#include "avcodec.h" -#include "adx.h" -#include "bytestream.h" -#include "internal.h" -#include "put_bits.h" - -/** - * @file - * SEGA CRI adx codecs. - * - * Reference documents: - * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html - * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/ - */ - -static void adx_encode(ADXContext *c, uint8_t *adx, const int16_t *wav, - ADXChannelState *prev, int channels) -{ - PutBitContext pb; - int scale; - int i, j; - int s0, s1, s2, d; - int max = 0; - int min = 0; - int data[BLOCK_SAMPLES]; - - s1 = prev->s1; - s2 = prev->s2; - for (i = 0, j = 0; j < 32; i += channels, j++) { - s0 = wav[i]; - d = ((s0 << COEFF_BITS) - c->coeff[0] * s1 - c->coeff[1] * s2) >> COEFF_BITS; - data[j] = d; - if (max < d) - max = d; - if (min > d) - min = d; - s2 = s1; - s1 = s0; - } - prev->s1 = s1; - prev->s2 = s2; - - if (max == 0 && min == 0) { - memset(adx, 0, BLOCK_SIZE); - return; - } - - if (max / 7 > -min / 8) - scale = max / 7; - else - scale = -min / 8; - - if (scale == 0) - scale = 1; - - AV_WB16(adx, scale); - - init_put_bits(&pb, adx + 2, 16); - for (i = 0; i < BLOCK_SAMPLES; i++) - put_sbits(&pb, 4, av_clip(data[i] / scale, -8, 7)); - flush_put_bits(&pb); -} - -#define HEADER_SIZE 36 - -static int adx_encode_header(AVCodecContext *avctx, uint8_t *buf, int bufsize) -{ - ADXContext *c = avctx->priv_data; - - bytestream_put_be16(&buf, 0x8000); /* header signature */ - bytestream_put_be16(&buf, HEADER_SIZE - 4); /* copyright offset */ - bytestream_put_byte(&buf, 3); /* encoding */ - bytestream_put_byte(&buf, BLOCK_SIZE); /* block size */ - bytestream_put_byte(&buf, 4); /* sample size */ - bytestream_put_byte(&buf, avctx->channels); /* channels */ - bytestream_put_be32(&buf, avctx->sample_rate); /* sample rate */ - bytestream_put_be32(&buf, 0); /* total sample count */ - bytestream_put_be16(&buf, c->cutoff); /* cutoff frequency */ - bytestream_put_byte(&buf, 3); /* version */ - bytestream_put_byte(&buf, 0); /* flags */ - bytestream_put_be32(&buf, 0); /* unknown */ - bytestream_put_be32(&buf, 0); /* loop enabled */ - bytestream_put_be16(&buf, 0); /* padding */ - bytestream_put_buffer(&buf, "(c)CRI", 6); /* copyright signature */ - - return HEADER_SIZE; -} - -static av_cold int adx_encode_init(AVCodecContext *avctx) -{ - ADXContext *c = avctx->priv_data; - - if (avctx->channels > 2) { - av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n"); - return AVERROR(EINVAL); - } - avctx->frame_size = BLOCK_SAMPLES; - - /* the cutoff can be adjusted, but this seems to work pretty well */ - c->cutoff = 500; - ff_adx_calculate_coeffs(c->cutoff, avctx->sample_rate, COEFF_BITS, c->coeff); - - return 0; -} - -static int adx_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, - const AVFrame *frame, int *got_packet_ptr) -{ - ADXContext *c = avctx->priv_data; - const int16_t *samples = (const int16_t *)frame->data[0]; - uint8_t *dst; - int ch, out_size, ret; - - out_size = BLOCK_SIZE * avctx->channels + !c->header_parsed * HEADER_SIZE; - if ((ret = ff_alloc_packet2(avctx, avpkt, out_size)) < 0) - return ret; - dst = avpkt->data; - - if (!c->header_parsed) { - int hdrsize; - if ((hdrsize = adx_encode_header(avctx, dst, avpkt->size)) < 0) { - av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n"); - return AVERROR(EINVAL); - } - dst += hdrsize; - c->header_parsed = 1; - } - - for (ch = 0; ch < avctx->channels; ch++) { - adx_encode(c, dst, samples + ch, &c->prev[ch], avctx->channels); - dst += BLOCK_SIZE; - } - - *got_packet_ptr = 1; - return 0; -} - -AVCodec ff_adpcm_adx_encoder = { - .name = "adpcm_adx", - .long_name = NULL_IF_CONFIG_SMALL("SEGA CRI ADX ADPCM"), - .type = AVMEDIA_TYPE_AUDIO, - .id = AV_CODEC_ID_ADPCM_ADX, - .priv_data_size = sizeof(ADXContext), - .init = adx_encode_init, - .encode2 = adx_encode_frame, - .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16, - AV_SAMPLE_FMT_NONE }, -}; |