X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fg726.c;h=85711f854c9d2b302cd2400cf995bf2cc48dcd9a;hb=b6e8ff72ea055f40ee272a97bde3ff21b3ea6c27;hp=d84a4e7eb81416213e9eda3a6b8ee8a12392082b;hpb=ef4c5c6dba075575900a2a81743b3ed3a2b8435f;p=ffmpeg diff --git a/libavcodec/g726.c b/libavcodec/g726.c index d84a4e7eb81..85711f854c9 100644 --- a/libavcodec/g726.c +++ b/libavcodec/g726.c @@ -1,29 +1,33 @@ /* * G.726 ADPCM audio codec - * Copyright (c) 2004 Roman Shaposhnik. + * 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. + * This file is part of Libav. * - * FFmpeg is free software; you can redistribute it and/or + * Libav 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, + * Libav 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 + * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include +#include "libavutil/avassert.h" +#include "libavutil/opt.h" #include "avcodec.h" -#include "bitstream.h" +#include "internal.h" +#include "get_bits.h" +#include "put_bits.h" /** * G.726 11bit float. @@ -63,7 +67,6 @@ static inline int sgn(int value) } typedef struct G726Tables { - int bits; /**< bits per sample */ const int* quant; /**< quantization table */ const int16_t* iquant; /**< inverse quantization table */ const int16_t* W; /**< special table #1 ;-) */ @@ -71,7 +74,9 @@ typedef struct G726Tables { } G726Tables; typedef struct G726Context { - const G726Tables* tbls; /**< static tables needed for computation */ + AVClass *class; + AVFrame frame; + G726Tables tbls; /**< static tables needed for computation */ Float11 sr[2]; /**< prev. reconstructed samples */ Float11 dq[6]; /**< prev. difference */ @@ -89,6 +94,7 @@ typedef struct G726Context { 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; } G726Context; static const int quant_tbl16[] = /**< 16kbit/s 2bits per sample */ @@ -138,10 +144,10 @@ static const uint8_t F_tbl40[] = 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 }; static const G726Tables G726Tables_pool[] = - {{ 2, quant_tbl16, iquant_tbl16, W_tbl16, F_tbl16 }, - { 3, quant_tbl24, iquant_tbl24, W_tbl24, F_tbl24 }, - { 4, quant_tbl32, iquant_tbl32, W_tbl32, F_tbl32 }, - { 5, quant_tbl40, iquant_tbl40, W_tbl40, F_tbl40 }}; + {{ 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 }}; /** @@ -159,12 +165,12 @@ static inline uint8_t quant(G726Context* c, int 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) + while (c->tbls.quant[i] < INT_MAX && c->tbls.quant[i] < dln) ++i; if (sign) i = ~i; - if (c->tbls->bits != 2 && i == 0) /* I'm not sure this is a good idea */ + if (c->code_size != 2 && i == 0) /* I'm not sure this is a good idea */ i = 0xff; return i; @@ -177,30 +183,29 @@ static inline int16_t inverse_quant(G726Context* c, int i) { int dql, dex, dqt; - dql = c->tbls->iquant[i] + (c->y >> 2); + 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<> 7); } -static int16_t g726_decode(G726Context* c, int16_t I) +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); - if (I >> (c->tbls->bits - 1)) /* get the sign */ - dq = -dq; - re_signal = c->se + dq; /* Transition detect */ ylint = (c->yl >> 15); ylfrac = (c->yl >> 10) & 0x1f; thr2 = (ylint > 9) ? 0x1f << 10 : (0x20 + ylfrac) << ylint; - if (c->td == 1 && abs(dq) > ((thr2+(thr2>>1))>>1)) - tr = 1; - else - tr = 0; + 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; @@ -231,23 +236,23 @@ static int16_t g726_decode(G726Context* c, int16_t I) for (i=5; i>0; i--) c->dq[i] = c->dq[i-1]; i2f(dq, &c->dq[0]); - c->dq[0].sign = I >> (c->tbls->bits - 1); /* Isn't it crazy ?!?! */ + c->dq[0].sign = I_sig; /* Isn't it crazy ?!?! */ - /* Update tone detect [I'm not sure 'tr == 0' is really needed] */ - c->td = (tr == 0 && c->a[1] < -11776); + c->td = c->a[1] < -11776; /* Update Ap */ - c->dms += ((c->tbls->F[I]<<9) - c->dms) >> 5; - c->dml += ((c->tbls->F[I]<<11) - c->dml) >> 7; + 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 if (c->y > 1535 && !c->td && (abs((c->dms << 2) - c->dml) < (c->dml >> 3))) + else { c->ap += (-c->ap) >> 4; - else - c->ap += (0x200 - 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] << 5) - c->y) >> 5), 544, 5120); + 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 */ @@ -266,11 +271,11 @@ static int16_t g726_decode(G726Context* c, int16_t I) return av_clip(re_signal << 2, -0xffff, 0xffff); } -static av_cold int g726_reset(G726Context* c, int index) +static av_cold int g726_reset(G726Context *c) { int i; - c->tbls = &G726Tables_pool[index]; + c->tbls = G726Tables_pool[c->code_size - 2]; for (i=0; i<2; i++) { c->sr[i].mant = 1<<5; c->pk[i] = 1; @@ -286,119 +291,198 @@ static av_cold int g726_reset(G726Context* c, int index) return 0; } -#ifdef CONFIG_ENCODERS +#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<tbls->bits) - 1); + i = quant(c, sig/4 - c->se) & ((1<code_size) - 1); g726_decode(c, i); return i; } -#endif /* Interfacing to the libavcodec */ -typedef struct AVG726Context { - G726Context c; - int code_size; -} AVG726Context; - -static av_cold int g726_init(AVCodecContext * avctx) +static av_cold int g726_encode_init(AVCodecContext *avctx) { - AVG726Context* c = (AVG726Context*)avctx->priv_data; - unsigned int index= (avctx->bit_rate + avctx->sample_rate/2) / avctx->sample_rate - 2; - - if (avctx->bit_rate % avctx->sample_rate && avctx->codec->encode) { - av_log(avctx, AV_LOG_ERROR, "Bitrate - Samplerate combination is invalid\n"); - return -1; + 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 -1; - } - if(index>3){ - av_log(avctx, AV_LOG_ERROR, "Unsupported number of bits %d\n", index+2); - return -1; + return AVERROR(EINVAL); } - g726_reset(&c->c, index); - c->code_size = c->c.tbls->bits; + + 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); avctx->coded_frame = avcodec_alloc_frame(); if (!avctx->coded_frame) return AVERROR(ENOMEM); avctx->coded_frame->key_frame = 1; + /* 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 av_cold int g726_close(AVCodecContext *avctx) +static av_cold int g726_encode_close(AVCodecContext *avctx) { av_freep(&avctx->coded_frame); return 0; } -#ifdef CONFIG_ENCODERS static int g726_encode_frame(AVCodecContext *avctx, uint8_t *dst, int buf_size, void *data) { - AVG726Context *c = avctx->priv_data; - short *samples = data; + G726Context *c = avctx->priv_data; + const int16_t *samples = data; PutBitContext pb; + int i; init_put_bits(&pb, dst, 1024*1024); - for (; buf_size; buf_size--) - put_bits(&pb, c->code_size, g726_encode(&c->c, *samples++)); + for (i = 0; i < avctx->frame_size; i++) + put_bits(&pb, c->code_size, g726_encode(c, *samples++)); flush_put_bits(&pb); return put_bits_count(&pb)>>3; } + +#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, { 4 }, 2, 5, AE }, + { NULL }, +}; + +static const AVClass 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", + .type = AVMEDIA_TYPE_AUDIO, + .id = CODEC_ID_ADPCM_G726, + .priv_data_size = sizeof(G726Context), + .init = g726_encode_init, + .encode = g726_encode_frame, + .close = g726_encode_close, + .capabilities = CODEC_CAP_SMALL_LAST_FRAME, + .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE}, + .long_name = NULL_IF_CONFIG_SMALL("G.726 ADPCM"), + .priv_class = &class, + .defaults = defaults, +}; #endif -static int g726_decode_frame(AVCodecContext *avctx, - void *data, int *data_size, - const uint8_t *buf, int buf_size) +#if CONFIG_ADPCM_G726_DECODER +static av_cold int g726_decode_init(AVCodecContext *avctx) { - AVG726Context *c = avctx->priv_data; - short *samples = data; + G726Context* c = avctx->priv_data; + + if (avctx->strict_std_compliance >= FF_COMPLIANCE_STRICT && + avctx->sample_rate != 8000) { + av_log(avctx, AV_LOG_ERROR, "Only 8kHz sample rate is allowed when " + "the compliance level is strict. Reduce the compliance level " + "if you wish to decode the stream anyway.\n"); + return AVERROR(EINVAL); + } + + if(avctx->channels != 1){ + av_log(avctx, AV_LOG_ERROR, "Only mono is supported\n"); + return AVERROR(EINVAL); + } + + 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; + + avcodec_get_frame_defaults(&c->frame); + avctx->coded_frame = &c->frame; + + return 0; +} + +static int g726_decode_frame(AVCodecContext *avctx, void *data, + int *got_frame_ptr, AVPacket *avpkt) +{ + 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 */ + c->frame.nb_samples = out_samples; + if ((ret = avctx->get_buffer(avctx, &c->frame)) < 0) { + av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); + return ret; + } + samples = (int16_t *)c->frame.data[0]; init_get_bits(&gb, buf, buf_size * 8); - while (get_bits_count(&gb) + c->code_size <= buf_size*8) - *samples++ = g726_decode(&c->c, get_bits(&gb, c->code_size)); + while (out_samples--) + *samples++ = g726_decode(c, get_bits(&gb, c->code_size)); - if(buf_size*8 != get_bits_count(&gb)) + if (get_bits_left(&gb) > 0) av_log(avctx, AV_LOG_ERROR, "Frame invalidly split, missing parser?\n"); - *data_size = (uint8_t*)samples - (uint8_t*)data; + *got_frame_ptr = 1; + *(AVFrame *)data = c->frame; + return buf_size; } -#ifdef CONFIG_ENCODERS -AVCodec adpcm_g726_encoder = { - "g726", - CODEC_TYPE_AUDIO, - CODEC_ID_ADPCM_G726, - sizeof(AVG726Context), - g726_init, - g726_encode_frame, - g726_close, - NULL, - .long_name = NULL_IF_CONFIG_SMALL("G.726 ADPCM"), -}; -#endif //CONFIG_ENCODERS - -AVCodec adpcm_g726_decoder = { - "g726", - CODEC_TYPE_AUDIO, - CODEC_ID_ADPCM_G726, - sizeof(AVG726Context), - g726_init, - NULL, - g726_close, - g726_decode_frame, +static void g726_decode_flush(AVCodecContext *avctx) +{ + G726Context *c = avctx->priv_data; + g726_reset(c); +} + +AVCodec ff_adpcm_g726_decoder = { + .name = "g726", + .type = AVMEDIA_TYPE_AUDIO, + .id = 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, .long_name = NULL_IF_CONFIG_SMALL("G.726 ADPCM"), }; +#endif