diff options
Diffstat (limited to 'ffmpeg/libavcodec/g726.c')
| -rw-r--r-- | ffmpeg/libavcodec/g726.c | 493 |
1 files changed, 0 insertions, 493 deletions
diff --git a/ffmpeg/libavcodec/g726.c b/ffmpeg/libavcodec/g726.c deleted file mode 100644 index b0331d8..0000000 --- a/ffmpeg/libavcodec/g726.c +++ /dev/null @@ -1,493 +0,0 @@ -/* - * G.726 ADPCM audio codec - * Copyright (c) 2004 Roman Shaposhnik - * - * This is a very straightforward rendition of the G.726 - * Section 4 "Computational Details". - * - * 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 <limits.h> - -#include "libavutil/avassert.h" -#include "libavutil/channel_layout.h" -#include "libavutil/opt.h" -#include "avcodec.h" -#include "internal.h" -#include "get_bits.h" -#include "put_bits.h" - -/** - * G.726 11bit float. - * G.726 Standard uses rather odd 11bit floating point arithmentic for - * numerous occasions. It's a mystery to me why they did it this way - * instead of simply using 32bit integer arithmetic. - */ -typedef struct Float11 { - uint8_t sign; /**< 1bit sign */ - uint8_t exp; /**< 4bit exponent */ - uint8_t mant; /**< 6bit mantissa */ -} Float11; - -static inline Float11* i2f(int i, Float11* f) -{ - f->sign = (i < 0); - if (f->sign) - i = -i; - f->exp = av_log2_16bit(i) + !!i; - f->mant = i? (i<<6) >> f->exp : 1<<5; - return f; -} - -static inline int16_t mult(Float11* f1, Float11* f2) -{ - int res, exp; - - exp = f1->exp + f2->exp; - res = (((f1->mant * f2->mant) + 0x30) >> 4); - res = exp > 19 ? res << (exp - 19) : res >> (19 - exp); - return (f1->sign ^ f2->sign) ? -res : res; -} - -static inline int sgn(int value) -{ - return (value < 0) ? -1 : 1; -} - -typedef struct G726Tables { - const int* quant; /**< quantization table */ - const int16_t* iquant; /**< inverse quantization table */ - const int16_t* W; /**< special table #1 ;-) */ - const uint8_t* F; /**< special table #2 */ -} G726Tables; - -typedef struct G726Context { - AVClass *class; - G726Tables tbls; /**< static tables needed for computation */ - - Float11 sr[2]; /**< prev. reconstructed samples */ - Float11 dq[6]; /**< prev. difference */ - int a[2]; /**< second order predictor coeffs */ - int b[6]; /**< sixth order predictor coeffs */ - int pk[2]; /**< signs of prev. 2 sez + dq */ - - int ap; /**< scale factor control */ - int yu; /**< fast scale factor */ - int yl; /**< slow scale factor */ - int dms; /**< short average magnitude of F[i] */ - int dml; /**< long average magnitude of F[i] */ - int td; /**< tone detect */ - - int se; /**< estimated signal for the next iteration */ - int sez; /**< estimated second order prediction */ - int y; /**< quantizer scaling factor for the next iteration */ - int code_size; - int little_endian; /**< little-endian bitstream as used in aiff and Sun AU */ -} G726Context; - -static const int quant_tbl16[] = /**< 16kbit/s 2bits per sample */ - { 260, INT_MAX }; -static const int16_t iquant_tbl16[] = - { 116, 365, 365, 116 }; -static const int16_t W_tbl16[] = - { -22, 439, 439, -22 }; -static const uint8_t F_tbl16[] = - { 0, 7, 7, 0 }; - -static const int quant_tbl24[] = /**< 24kbit/s 3bits per sample */ - { 7, 217, 330, INT_MAX }; -static const int16_t iquant_tbl24[] = - { INT16_MIN, 135, 273, 373, 373, 273, 135, INT16_MIN }; -static const int16_t W_tbl24[] = - { -4, 30, 137, 582, 582, 137, 30, -4 }; -static const uint8_t F_tbl24[] = - { 0, 1, 2, 7, 7, 2, 1, 0 }; - -static const int quant_tbl32[] = /**< 32kbit/s 4bits per sample */ - { -125, 79, 177, 245, 299, 348, 399, INT_MAX }; -static const int16_t iquant_tbl32[] = - { INT16_MIN, 4, 135, 213, 273, 323, 373, 425, - 425, 373, 323, 273, 213, 135, 4, INT16_MIN }; -static const int16_t W_tbl32[] = - { -12, 18, 41, 64, 112, 198, 355, 1122, - 1122, 355, 198, 112, 64, 41, 18, -12}; -static const uint8_t F_tbl32[] = - { 0, 0, 0, 1, 1, 1, 3, 7, 7, 3, 1, 1, 1, 0, 0, 0 }; - -static const int quant_tbl40[] = /**< 40kbit/s 5bits per sample */ - { -122, -16, 67, 138, 197, 249, 297, 338, - 377, 412, 444, 474, 501, 527, 552, INT_MAX }; -static const int16_t iquant_tbl40[] = - { INT16_MIN, -66, 28, 104, 169, 224, 274, 318, - 358, 395, 429, 459, 488, 514, 539, 566, - 566, 539, 514, 488, 459, 429, 395, 358, - 318, 274, 224, 169, 104, 28, -66, INT16_MIN }; -static const int16_t W_tbl40[] = - { 14, 14, 24, 39, 40, 41, 58, 100, - 141, 179, 219, 280, 358, 440, 529, 696, - 696, 529, 440, 358, 280, 219, 179, 141, - 100, 58, 41, 40, 39, 24, 14, 14 }; -static const uint8_t F_tbl40[] = - { 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 3, 4, 5, 6, 6, - 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 }; - -static const G726Tables G726Tables_pool[] = - {{ quant_tbl16, iquant_tbl16, W_tbl16, F_tbl16 }, - { quant_tbl24, iquant_tbl24, W_tbl24, F_tbl24 }, - { quant_tbl32, iquant_tbl32, W_tbl32, F_tbl32 }, - { quant_tbl40, iquant_tbl40, W_tbl40, F_tbl40 }}; - - -/** - * Para 4.2.2 page 18: Adaptive quantizer. - */ -static inline uint8_t quant(G726Context* c, int d) -{ - int sign, exp, i, dln; - - sign = i = 0; - if (d < 0) { - sign = 1; - d = -d; - } - exp = av_log2_16bit(d); - dln = ((exp<<7) + (((d<<7)>>exp)&0x7f)) - (c->y>>2); - - while (c->tbls.quant[i] < INT_MAX && c->tbls.quant[i] < dln) - ++i; - - if (sign) - i = ~i; - if (c->code_size != 2 && i == 0) /* I'm not sure this is a good idea */ - i = 0xff; - - return i; -} - -/** - * Para 4.2.3 page 22: Inverse adaptive quantizer. - */ -static inline int16_t inverse_quant(G726Context* c, int i) -{ - int dql, dex, dqt; - - dql = c->tbls.iquant[i] + (c->y >> 2); - dex = (dql>>7) & 0xf; /* 4bit exponent */ - dqt = (1<<7) + (dql & 0x7f); /* log2 -> linear */ - return (dql < 0) ? 0 : ((dqt<<dex) >> 7); -} - -static int16_t g726_decode(G726Context* c, int I) -{ - int dq, re_signal, pk0, fa1, i, tr, ylint, ylfrac, thr2, al, dq0; - Float11 f; - int I_sig= I >> (c->code_size - 1); - - dq = inverse_quant(c, I); - - /* Transition detect */ - ylint = (c->yl >> 15); - ylfrac = (c->yl >> 10) & 0x1f; - thr2 = (ylint > 9) ? 0x1f << 10 : (0x20 + ylfrac) << ylint; - tr= (c->td == 1 && dq > ((3*thr2)>>2)); - - if (I_sig) /* get the sign */ - dq = -dq; - re_signal = c->se + dq; - - /* Update second order predictor coefficient A2 and A1 */ - pk0 = (c->sez + dq) ? sgn(c->sez + dq) : 0; - dq0 = dq ? sgn(dq) : 0; - if (tr) { - c->a[0] = 0; - c->a[1] = 0; - for (i=0; i<6; i++) - c->b[i] = 0; - } else { - /* This is a bit crazy, but it really is +255 not +256 */ - fa1 = av_clip((-c->a[0]*c->pk[0]*pk0)>>5, -256, 255); - - c->a[1] += 128*pk0*c->pk[1] + fa1 - (c->a[1]>>7); - c->a[1] = av_clip(c->a[1], -12288, 12288); - c->a[0] += 64*3*pk0*c->pk[0] - (c->a[0] >> 8); - c->a[0] = av_clip(c->a[0], -(15360 - c->a[1]), 15360 - c->a[1]); - - for (i=0; i<6; i++) - c->b[i] += 128*dq0*sgn(-c->dq[i].sign) - (c->b[i]>>8); - } - - /* Update Dq and Sr and Pk */ - c->pk[1] = c->pk[0]; - c->pk[0] = pk0 ? pk0 : 1; - c->sr[1] = c->sr[0]; - i2f(re_signal, &c->sr[0]); - for (i=5; i>0; i--) - c->dq[i] = c->dq[i-1]; - i2f(dq, &c->dq[0]); - c->dq[0].sign = I_sig; /* Isn't it crazy ?!?! */ - - c->td = c->a[1] < -11776; - - /* Update Ap */ - c->dms += (c->tbls.F[I]<<4) + ((- c->dms) >> 5); - c->dml += (c->tbls.F[I]<<4) + ((- c->dml) >> 7); - if (tr) - c->ap = 256; - else { - c->ap += (-c->ap) >> 4; - if (c->y <= 1535 || c->td || abs((c->dms << 2) - c->dml) >= (c->dml >> 3)) - c->ap += 0x20; - } - - /* Update Yu and Yl */ - c->yu = av_clip(c->y + c->tbls.W[I] + ((-c->y)>>5), 544, 5120); - c->yl += c->yu + ((-c->yl)>>6); - - /* Next iteration for Y */ - al = (c->ap >= 256) ? 1<<6 : c->ap >> 2; - c->y = (c->yl + (c->yu - (c->yl>>6))*al) >> 6; - - /* Next iteration for SE and SEZ */ - c->se = 0; - for (i=0; i<6; i++) - c->se += mult(i2f(c->b[i] >> 2, &f), &c->dq[i]); - c->sez = c->se >> 1; - for (i=0; i<2; i++) - c->se += mult(i2f(c->a[i] >> 2, &f), &c->sr[i]); - c->se >>= 1; - - return av_clip(re_signal << 2, -0xffff, 0xffff); -} - -static av_cold int g726_reset(G726Context *c) -{ - int i; - - c->tbls = G726Tables_pool[c->code_size - 2]; - for (i=0; i<2; i++) { - c->sr[i].mant = 1<<5; - c->pk[i] = 1; - } - for (i=0; i<6; i++) { - c->dq[i].mant = 1<<5; - } - c->yu = 544; - c->yl = 34816; - - c->y = 544; - - return 0; -} - -#if CONFIG_ADPCM_G726_ENCODER -static int16_t g726_encode(G726Context* c, int16_t sig) -{ - uint8_t i; - - i = quant(c, sig/4 - c->se) & ((1<<c->code_size) - 1); - g726_decode(c, i); - return i; -} - -/* Interfacing to the libavcodec */ - -static av_cold int g726_encode_init(AVCodecContext *avctx) -{ - G726Context* c = avctx->priv_data; - - if (avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL && - avctx->sample_rate != 8000) { - av_log(avctx, AV_LOG_ERROR, "Sample rates other than 8kHz are not " - "allowed when the compliance level is higher than unofficial. " - "Resample or reduce the compliance level.\n"); - return AVERROR(EINVAL); - } - av_assert0(avctx->sample_rate > 0); - - if(avctx->channels != 1){ - av_log(avctx, AV_LOG_ERROR, "Only mono is supported\n"); - return AVERROR(EINVAL); - } - - if (avctx->bit_rate) - c->code_size = (avctx->bit_rate + avctx->sample_rate/2) / avctx->sample_rate; - - c->code_size = av_clip(c->code_size, 2, 5); - avctx->bit_rate = c->code_size * avctx->sample_rate; - avctx->bits_per_coded_sample = c->code_size; - - g726_reset(c); - - /* select a frame size that will end on a byte boundary and have a size of - approximately 1024 bytes */ - avctx->frame_size = ((int[]){ 4096, 2736, 2048, 1640 })[c->code_size - 2]; - - return 0; -} - -static int g726_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, - const AVFrame *frame, int *got_packet_ptr) -{ - G726Context *c = avctx->priv_data; - const int16_t *samples = (const int16_t *)frame->data[0]; - PutBitContext pb; - int i, ret, out_size; - - out_size = (frame->nb_samples * c->code_size + 7) / 8; - if ((ret = ff_alloc_packet2(avctx, avpkt, out_size)) < 0) - return ret; - init_put_bits(&pb, avpkt->data, avpkt->size); - - for (i = 0; i < frame->nb_samples; i++) - put_bits(&pb, c->code_size, g726_encode(c, *samples++)); - - flush_put_bits(&pb); - - avpkt->size = out_size; - *got_packet_ptr = 1; - return 0; -} - -#define OFFSET(x) offsetof(G726Context, x) -#define AE AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM -static const AVOption options[] = { - { "code_size", "Bits per code", OFFSET(code_size), AV_OPT_TYPE_INT, { .i64 = 4 }, 2, 5, AE }, - { NULL }, -}; - -static const AVClass g726_class = { - .class_name = "g726", - .item_name = av_default_item_name, - .option = options, - .version = LIBAVUTIL_VERSION_INT, -}; - -static const AVCodecDefault defaults[] = { - { "b", "0" }, - { NULL }, -}; - -AVCodec ff_adpcm_g726_encoder = { - .name = "g726", - .long_name = NULL_IF_CONFIG_SMALL("G.726 ADPCM"), - .type = AVMEDIA_TYPE_AUDIO, - .id = AV_CODEC_ID_ADPCM_G726, - .priv_data_size = sizeof(G726Context), - .init = g726_encode_init, - .encode2 = g726_encode_frame, - .capabilities = CODEC_CAP_SMALL_LAST_FRAME, - .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, - AV_SAMPLE_FMT_NONE }, - .priv_class = &g726_class, - .defaults = defaults, -}; -#endif - -#if CONFIG_ADPCM_G726_DECODER || CONFIG_ADPCM_G726LE_DECODER -static av_cold int g726_decode_init(AVCodecContext *avctx) -{ - G726Context* c = avctx->priv_data; - - if(avctx->channels > 1){ - avpriv_request_sample(avctx, "Decoding more than one channel"); - return AVERROR_PATCHWELCOME; - } - avctx->channels = 1; - avctx->channel_layout = AV_CH_LAYOUT_MONO; - - c->little_endian = !strcmp(avctx->codec->name, "g726le"); - - c->code_size = avctx->bits_per_coded_sample; - if (c->code_size < 2 || c->code_size > 5) { - av_log(avctx, AV_LOG_ERROR, "Invalid number of bits %d\n", c->code_size); - return AVERROR(EINVAL); - } - g726_reset(c); - - avctx->sample_fmt = AV_SAMPLE_FMT_S16; - - return 0; -} - -static int g726_decode_frame(AVCodecContext *avctx, void *data, - int *got_frame_ptr, AVPacket *avpkt) -{ - AVFrame *frame = data; - const uint8_t *buf = avpkt->data; - int buf_size = avpkt->size; - G726Context *c = avctx->priv_data; - int16_t *samples; - GetBitContext gb; - int out_samples, ret; - - out_samples = buf_size * 8 / c->code_size; - - /* get output buffer */ - frame->nb_samples = out_samples; - if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) - return ret; - samples = (int16_t *)frame->data[0]; - - init_get_bits(&gb, buf, buf_size * 8); - - while (out_samples--) - *samples++ = g726_decode(c, c->little_endian ? - get_bits_le(&gb, c->code_size) : - get_bits(&gb, c->code_size)); - - if (get_bits_left(&gb) > 0) - av_log(avctx, AV_LOG_ERROR, "Frame invalidly split, missing parser?\n"); - - *got_frame_ptr = 1; - - return buf_size; -} - -static void g726_decode_flush(AVCodecContext *avctx) -{ - G726Context *c = avctx->priv_data; - g726_reset(c); -} -#endif - -#if CONFIG_ADPCM_G726_DECODER -AVCodec ff_adpcm_g726_decoder = { - .name = "g726", - .long_name = NULL_IF_CONFIG_SMALL("G.726 ADPCM"), - .type = AVMEDIA_TYPE_AUDIO, - .id = AV_CODEC_ID_ADPCM_G726, - .priv_data_size = sizeof(G726Context), - .init = g726_decode_init, - .decode = g726_decode_frame, - .flush = g726_decode_flush, - .capabilities = CODEC_CAP_DR1, -}; -#endif - -#if CONFIG_ADPCM_G726LE_DECODER -AVCodec ff_adpcm_g726le_decoder = { - .name = "g726le", - .type = AVMEDIA_TYPE_AUDIO, - .id = AV_CODEC_ID_ADPCM_G726LE, - .priv_data_size = sizeof(G726Context), - .init = g726_decode_init, - .decode = g726_decode_frame, - .flush = g726_decode_flush, - .capabilities = CODEC_CAP_DR1, - .long_name = NULL_IF_CONFIG_SMALL("G.726 ADPCM little-endian"), -}; -#endif |