diff options
Diffstat (limited to 'ffmpeg1/libavcodec/g722dec.c')
| -rw-r--r-- | ffmpeg1/libavcodec/g722dec.c | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/ffmpeg1/libavcodec/g722dec.c b/ffmpeg1/libavcodec/g722dec.c deleted file mode 100644 index 1a489a7..0000000 --- a/ffmpeg1/libavcodec/g722dec.c +++ /dev/null @@ -1,149 +0,0 @@ -/* - * Copyright (c) CMU 1993 Computer Science, Speech Group - * Chengxiang Lu and Alex Hauptmann - * Copyright (c) 2005 Steve Underwood <steveu at coppice.org> - * Copyright (c) 2009 Kenan Gillet - * Copyright (c) 2010 Martin Storsjo - * - * 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 - */ - -/** - * @file - * G.722 ADPCM audio decoder - * - * This G.722 decoder is a bit-exact implementation of the ITU G.722 - * specification for all three specified bitrates - 64000bps, 56000bps - * and 48000bps. It passes the ITU tests. - * - * @note For the 56000bps and 48000bps bitrates, the lowest 1 or 2 bits - * respectively of each byte are ignored. - */ - -#include "libavutil/channel_layout.h" -#include "libavutil/opt.h" -#include "avcodec.h" -#include "get_bits.h" -#include "g722.h" -#include "internal.h" - -#define OFFSET(x) offsetof(G722Context, x) -#define AD AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM -static const AVOption options[] = { - { "bits_per_codeword", "Bits per G722 codeword", OFFSET(bits_per_codeword), AV_OPT_TYPE_FLAGS, { .i64 = 8 }, 6, 8, AD }, - { NULL } -}; - -static const AVClass g722_decoder_class = { - .class_name = "g722 decoder", - .item_name = av_default_item_name, - .option = options, - .version = LIBAVUTIL_VERSION_INT, -}; - -static av_cold int g722_decode_init(AVCodecContext * avctx) -{ - G722Context *c = avctx->priv_data; - - avctx->channels = 1; - avctx->channel_layout = AV_CH_LAYOUT_MONO; - avctx->sample_fmt = AV_SAMPLE_FMT_S16; - - c->band[0].scale_factor = 8; - c->band[1].scale_factor = 2; - c->prev_samples_pos = 22; - - return 0; -} - -static const int16_t low_inv_quant5[32] = { - -35, -35, -2919, -2195, -1765, -1458, -1219, -1023, - -858, -714, -587, -473, -370, -276, -190, -110, - 2919, 2195, 1765, 1458, 1219, 1023, 858, 714, - 587, 473, 370, 276, 190, 110, 35, -35 -}; - -static const int16_t *low_inv_quants[3] = { ff_g722_low_inv_quant6, - low_inv_quant5, - ff_g722_low_inv_quant4 }; - -static int g722_decode_frame(AVCodecContext *avctx, void *data, - int *got_frame_ptr, AVPacket *avpkt) -{ - G722Context *c = avctx->priv_data; - AVFrame *frame = data; - int16_t *out_buf; - int j, ret; - const int skip = 8 - c->bits_per_codeword; - const int16_t *quantizer_table = low_inv_quants[skip]; - GetBitContext gb; - - /* get output buffer */ - frame->nb_samples = avpkt->size * 2; - if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) - return ret; - out_buf = (int16_t *)frame->data[0]; - - init_get_bits(&gb, avpkt->data, avpkt->size * 8); - - for (j = 0; j < avpkt->size; j++) { - int ilow, ihigh, rlow, rhigh, dhigh; - int xout1, xout2; - - ihigh = get_bits(&gb, 2); - ilow = get_bits(&gb, 6 - skip); - skip_bits(&gb, skip); - - rlow = av_clip((c->band[0].scale_factor * quantizer_table[ilow] >> 10) - + c->band[0].s_predictor, -16384, 16383); - - ff_g722_update_low_predictor(&c->band[0], ilow >> (2 - skip)); - - dhigh = c->band[1].scale_factor * ff_g722_high_inv_quant[ihigh] >> 10; - rhigh = av_clip(dhigh + c->band[1].s_predictor, -16384, 16383); - - ff_g722_update_high_predictor(&c->band[1], dhigh, ihigh); - - c->prev_samples[c->prev_samples_pos++] = rlow + rhigh; - c->prev_samples[c->prev_samples_pos++] = rlow - rhigh; - ff_g722_apply_qmf(c->prev_samples + c->prev_samples_pos - 24, - &xout1, &xout2); - *out_buf++ = av_clip_int16(xout1 >> 11); - *out_buf++ = av_clip_int16(xout2 >> 11); - if (c->prev_samples_pos >= PREV_SAMPLES_BUF_SIZE) { - memmove(c->prev_samples, c->prev_samples + c->prev_samples_pos - 22, - 22 * sizeof(c->prev_samples[0])); - c->prev_samples_pos = 22; - } - } - - *got_frame_ptr = 1; - - return avpkt->size; -} - -AVCodec ff_adpcm_g722_decoder = { - .name = "g722", - .type = AVMEDIA_TYPE_AUDIO, - .id = AV_CODEC_ID_ADPCM_G722, - .priv_data_size = sizeof(G722Context), - .init = g722_decode_init, - .decode = g722_decode_frame, - .capabilities = CODEC_CAP_DR1, - .long_name = NULL_IF_CONFIG_SMALL("G.722 ADPCM"), - .priv_class = &g722_decoder_class, -}; |