X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fg726.c;h=e783e74c90dbdc20ad9b2bda16e1a0d1657f5b88;hb=851960f6f8cf1f946fe42fa36cf6598fac68072c;hp=523ee979bf435a9b4504242f26e52e39316f1340;hpb=deec52ccf24d6c9f68e2fc546afab7606dde05da;p=ffmpeg diff --git a/libavcodec/g726.c b/libavcodec/g726.c index 523ee979bf4..e783e74c90d 100644 --- a/libavcodec/g726.c +++ b/libavcodec/g726.c @@ -1,40 +1,45 @@ /* * 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/channel_layout.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. - * G.726 Standard uses rather odd 11bit floating point arithmentic for - * numerous occasions. It's a mistery to me why they did it this way - * instead of simply using 32bit integer arithmetic. + * G.726 11-bit float. + * G.726 Standard uses rather odd 11-bit floating point arithmetic for + * numerous occasions. It's a mystery to me why they did it this way + * instead of simply using 32-bit integer arithmetic. */ typedef struct Float11 { - uint8_t sign; /**< 1bit sign */ - uint8_t exp; /**< 4bit exponent */ - uint8_t mant; /**< 6bit mantissa */ + uint8_t sign; /**< 1 bit sign */ + uint8_t exp; /**< 4 bits exponent */ + uint8_t mant; /**< 6 bits mantissa */ } Float11; static inline Float11* i2f(int i, Float11* f) @@ -63,15 +68,15 @@ static inline int sgn(int value) } typedef struct G726Tables { - int bits; /**< bits per sample */ const int* quant; /**< quantization table */ - const int* iquant; /**< inverse quantization table */ - const int* W; /**< special table #1 ;-) */ - const int* F; /**< special table #2 */ + 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 { - const G726Tables* tbls; /**< static tables needed for computation */ + AVClass *class; + G726Tables tbls; /**< static tables needed for computation */ Float11 sr[2]; /**< prev. reconstructed samples */ Float11 dq[6]; /**< prev. difference */ @@ -89,63 +94,64 @@ 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 */ +static const int quant_tbl16[] = /**< 16kbit/s 2 bits per sample */ { 260, INT_MAX }; -static const int iquant_tbl16[] = +static const int16_t iquant_tbl16[] = { 116, 365, 365, 116 }; -static const int W_tbl16[] = +static const int16_t W_tbl16[] = { -22, 439, 439, -22 }; -static const int F_tbl16[] = +static const uint8_t F_tbl16[] = { 0, 7, 7, 0 }; -static const int quant_tbl24[] = /**< 24kbit/s 3bits per sample */ +static const int quant_tbl24[] = /**< 24kbit/s 3 bits per sample */ { 7, 217, 330, INT_MAX }; -static const int iquant_tbl24[] = - { INT_MIN, 135, 273, 373, 373, 273, 135, INT_MIN }; -static const int W_tbl24[] = +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 int F_tbl24[] = +static const uint8_t F_tbl24[] = { 0, 1, 2, 7, 7, 2, 1, 0 }; -static const int quant_tbl32[] = /**< 32kbit/s 4bits per sample */ +static const int quant_tbl32[] = /**< 32kbit/s 4 bits per sample */ { -125, 79, 177, 245, 299, 348, 399, INT_MAX }; -static const int iquant_tbl32[] = - { INT_MIN, 4, 135, 213, 273, 323, 373, 425, - 425, 373, 323, 273, 213, 135, 4, INT_MIN }; -static const int W_tbl32[] = +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 int F_tbl32[] = +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 */ +static const int quant_tbl40[] = /**< 40kbit/s 5 bits per sample */ { -122, -16, 67, 138, 197, 249, 297, 338, 377, 412, 444, 474, 501, 527, 552, INT_MAX }; -static const int iquant_tbl40[] = - { INT_MIN, -66, 28, 104, 169, 224, 274, 318, +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, INT_MIN }; -static const int W_tbl40[] = + 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 int F_tbl40[] = +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[] = - {{ 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 }}; /** - * Para 4.2.2 page 18: Adaptive quantizer. + * Paragraph 4.2.2 page 18: Adaptive quantizer. */ static inline uint8_t quant(G726Context* c, int d) { @@ -159,48 +165,47 @@ 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; } /** - * Para 4.2.3 page 22: Inverse adaptive quantizer. + * Paragraph 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 */ + dql = c->tbls.iquant[i] + (c->y >> 2); + dex = (dql>>7) & 0xf; /* 4-bit exponent */ dqt = (1<<7) + (dql & 0x7f); /* log2 -> linear */ - return (dql < 0) ? 0 : ((dqt<<7) >> (14-dex)); + return (dql < 0) ? 0 : ((dqt<> 7); } -static inline int16_t g726_iterate(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; @@ -212,7 +217,7 @@ static inline int16_t g726_iterate(G726Context* c, int16_t 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); + fa1 = av_clip_intp2((-c->a[0]*c->pk[0]*pk0)>>5, 8); c->a[1] += 128*pk0*c->pk[1] + fa1 - (c->a[1]>>7); c->a[1] = av_clip(c->a[1], -12288, 12288); @@ -231,23 +236,23 @@ static inline int16_t g726_iterate(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 */ @@ -266,164 +271,205 @@ static inline int16_t g726_iterate(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++) { - i2f(0, &c->sr[i]); - c->a[i] = 0; + c->sr[i].mant = 1<<5; c->pk[i] = 1; } for (i=0; i<6; i++) { - i2f(0, &c->dq[i]); - c->b[i] = 0; + c->dq[i].mant = 1<<5; } - c->ap = 0; - c->dms = 0; - c->dml = 0; c->yu = 544; c->yl = 34816; - c->td = 0; - c->se = 0; - c->sez = 0; c->y = 544; return 0; } -static int16_t g726_decode(G726Context* c, int16_t i) -{ - return g726_iterate(c, i); -} - -#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); - g726_iterate(c, i); + 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 bits_left; - int bit_buffer; - 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); } + if (avctx->sample_rate <= 0) { + av_log(avctx, AV_LOG_ERROR, "Invalid sample rate %d\n", + avctx->sample_rate); + return AVERROR(EINVAL); + } + if(avctx->channels != 1){ av_log(avctx, AV_LOG_ERROR, "Only mono is supported\n"); - return -1; + return AVERROR(EINVAL); } - if(index>3){ - av_log(avctx, AV_LOG_ERROR, "Unsupported number of bits %d\n", index+2); - return -1; - } - g726_reset(&c->c, index); - c->code_size = c->c.tbls->bits; - c->bit_buffer = 0; - c->bits_left = 0; - avctx->coded_frame = avcodec_alloc_frame(); - if (!avctx->coded_frame) - return AVERROR(ENOMEM); - avctx->coded_frame->key_frame = 1; + if (avctx->bit_rate) + c->code_size = (avctx->bit_rate + avctx->sample_rate/2) / avctx->sample_rate; - return 0; -} + 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]; -static av_cold int g726_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) +static int g726_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, + const AVFrame *frame, int *got_packet_ptr) { - AVG726Context *c = avctx->priv_data; - short *samples = data; + G726Context *c = avctx->priv_data; + const int16_t *samples = (const int16_t *)frame->data[0]; PutBitContext pb; + int i, ret, out_size; - init_put_bits(&pb, dst, 1024*1024); + out_size = (frame->nb_samples * c->code_size + 7) / 8; + if ((ret = ff_alloc_packet(avpkt, out_size))) { + av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n"); + return ret; + } + init_put_bits(&pb, avpkt->data, avpkt->size); - for (; buf_size; buf_size--) - put_bits(&pb, c->code_size, g726_encode(&c->c, *samples++)); + for (i = 0; i < frame->nb_samples; i++) + put_bits(&pb, c->code_size, g726_encode(c, *samples++)); flush_put_bits(&pb); - return put_bits_count(&pb)>>3; + 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 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 = AV_CODEC_CAP_SMALL_LAST_FRAME, + .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, + AV_SAMPLE_FMT_NONE }, + .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) +{ + G726Context* c = avctx->priv_data; + + avctx->channels = 1; + avctx->channel_layout = AV_CH_LAYOUT_MONO; + + 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) { - AVG726Context *c = avctx->priv_data; - short *samples = data; - uint8_t code; - uint8_t mask; + 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; - mask = (1<code_size) - 1; - init_get_bits(&gb, buf, buf_size * 8); - if (c->bits_left) { - int s = c->code_size - c->bits_left; - code = (c->bit_buffer << s) | get_bits(&gb, s); - *samples++ = g726_decode(&c->c, code & mask); + 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) { + av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); + return ret; } + samples = (int16_t *)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)); - c->bits_left = buf_size*8 - get_bits_count(&gb); - c->bit_buffer = get_bits(&gb, c->bits_left); + if (get_bits_left(&gb) > 0) + av_log(avctx, AV_LOG_ERROR, "Frame invalidly split, missing parser?\n"); + + *got_frame_ptr = 1; - *data_size = (uint8_t*)samples - (uint8_t*)data; 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, - .long_name = NULL_IF_CONFIG_SMALL("G.726 ADPCM"), +static void g726_decode_flush(AVCodecContext *avctx) +{ + G726Context *c = avctx->priv_data; + g726_reset(c); +} + +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 = AV_CODEC_CAP_DR1, }; +#endif