diff options
Diffstat (limited to 'ffmpeg1/libavcodec/cngdec.c')
| -rw-r--r-- | ffmpeg1/libavcodec/cngdec.c | 171 |
1 files changed, 0 insertions, 171 deletions
diff --git a/ffmpeg1/libavcodec/cngdec.c b/ffmpeg1/libavcodec/cngdec.c deleted file mode 100644 index 675f77d..0000000 --- a/ffmpeg1/libavcodec/cngdec.c +++ /dev/null @@ -1,171 +0,0 @@ -/* - * RFC 3389 comfort noise generator - * Copyright (c) 2012 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 - */ - -#include <math.h> - -#include "libavutil/common.h" -#include "avcodec.h" -#include "celp_filters.h" -#include "internal.h" -#include "libavutil/lfg.h" - -typedef struct CNGContext { - float *refl_coef, *target_refl_coef; - float *lpc_coef; - int order; - int energy, target_energy; - int inited; - float *filter_out; - float *excitation; - AVLFG lfg; -} CNGContext; - -static av_cold int cng_decode_close(AVCodecContext *avctx) -{ - CNGContext *p = avctx->priv_data; - av_free(p->refl_coef); - av_free(p->target_refl_coef); - av_free(p->lpc_coef); - av_free(p->filter_out); - av_free(p->excitation); - return 0; -} - -static av_cold int cng_decode_init(AVCodecContext *avctx) -{ - CNGContext *p = avctx->priv_data; - - avctx->sample_fmt = AV_SAMPLE_FMT_S16; - avctx->channels = 1; - avctx->sample_rate = 8000; - - p->order = 12; - avctx->frame_size = 640; - p->refl_coef = av_mallocz(p->order * sizeof(*p->refl_coef)); - p->target_refl_coef = av_mallocz(p->order * sizeof(*p->target_refl_coef)); - p->lpc_coef = av_mallocz(p->order * sizeof(*p->lpc_coef)); - p->filter_out = av_mallocz((avctx->frame_size + p->order) * - sizeof(*p->filter_out)); - p->excitation = av_mallocz(avctx->frame_size * sizeof(*p->excitation)); - if (!p->refl_coef || !p->target_refl_coef || !p->lpc_coef || - !p->filter_out || !p->excitation) { - cng_decode_close(avctx); - return AVERROR(ENOMEM); - } - - av_lfg_init(&p->lfg, 0); - - return 0; -} - -static void make_lpc_coefs(float *lpc, const float *refl, int order) -{ - float buf[100]; - float *next, *cur; - int m, i; - next = buf; - cur = lpc; - for (m = 0; m < order; m++) { - next[m] = refl[m]; - for (i = 0; i < m; i++) - next[i] = cur[i] + refl[m] * cur[m - i - 1]; - FFSWAP(float*, next, cur); - } - if (cur != lpc) - memcpy(lpc, cur, sizeof(*lpc) * order); -} - -static void cng_decode_flush(AVCodecContext *avctx) -{ - CNGContext *p = avctx->priv_data; - p->inited = 0; -} - -static int cng_decode_frame(AVCodecContext *avctx, void *data, - int *got_frame_ptr, AVPacket *avpkt) -{ - AVFrame *frame = data; - CNGContext *p = avctx->priv_data; - int buf_size = avpkt->size; - int ret, i; - int16_t *buf_out; - float e = 1.0; - float scaling; - - if (avpkt->size) { - int dbov = -avpkt->data[0]; - p->target_energy = 1081109975 * pow(10, dbov / 10.0) * 0.75; - memset(p->target_refl_coef, 0, p->order * sizeof(*p->target_refl_coef)); - for (i = 0; i < FFMIN(avpkt->size - 1, p->order); i++) { - p->target_refl_coef[i] = (avpkt->data[1 + i] - 127) / 128.0; - } - } - - if (p->inited) { - p->energy = p->energy / 2 + p->target_energy / 2; - for (i = 0; i < p->order; i++) - p->refl_coef[i] = 0.6 *p->refl_coef[i] + 0.4 * p->target_refl_coef[i]; - } else { - p->energy = p->target_energy; - memcpy(p->refl_coef, p->target_refl_coef, p->order * sizeof(*p->refl_coef)); - p->inited = 1; - } - make_lpc_coefs(p->lpc_coef, p->refl_coef, p->order); - - for (i = 0; i < p->order; i++) - e *= 1.0 - p->refl_coef[i]*p->refl_coef[i]; - - scaling = sqrt(e * p->energy / 1081109975); - for (i = 0; i < avctx->frame_size; i++) { - int r = (av_lfg_get(&p->lfg) & 0xffff) - 0x8000; - p->excitation[i] = scaling * r; - } - ff_celp_lp_synthesis_filterf(p->filter_out + p->order, p->lpc_coef, - p->excitation, avctx->frame_size, p->order); - - frame->nb_samples = avctx->frame_size; - if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) - return ret; - buf_out = (int16_t *)frame->data[0]; - for (i = 0; i < avctx->frame_size; i++) - buf_out[i] = p->filter_out[i + p->order]; - memcpy(p->filter_out, p->filter_out + avctx->frame_size, - p->order * sizeof(*p->filter_out)); - - *got_frame_ptr = 1; - - return buf_size; -} - -AVCodec ff_comfortnoise_decoder = { - .name = "comfortnoise", - .type = AVMEDIA_TYPE_AUDIO, - .id = AV_CODEC_ID_COMFORT_NOISE, - .priv_data_size = sizeof(CNGContext), - .init = cng_decode_init, - .decode = cng_decode_frame, - .flush = cng_decode_flush, - .close = cng_decode_close, - .long_name = NULL_IF_CONFIG_SMALL("RFC 3389 comfort noise generator"), - .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, - AV_SAMPLE_FMT_NONE }, - .capabilities = CODEC_CAP_DELAY | CODEC_CAP_DR1, -}; |