/*
  * audio conversion
  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
  *
  * 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
  * audio conversion
  * @author Michael Niedermayer <michaelni@gmx.at>
  */
 
 #include "libavutil/avstring.h"
 #include "libavutil/avassert.h"
 #include "libavutil/libm.h"
 #include "libavutil/samplefmt.h"
 #include "audioconvert.h"
 
 

 #define CONV_FUNC_NAME(dst_fmt, src_fmt) conv_ ## src_fmt ## _to_ ## dst_fmt
 
 //FIXME rounding ?
 #define CONV_FUNC(ofmt, otype, ifmt, expr)\
 static void CONV_FUNC_NAME(ofmt, ifmt)(uint8_t *po, const uint8_t *pi, int is, int os, uint8_t *end)\
 {\

     uint8_t *end2 = end - 3*os;\
     while(po < end2){\

         *(otype*)po = expr; pi += is; po += os;\

         *(otype*)po = expr; pi += is; po += os;\
         *(otype*)po = expr; pi += is; po += os;\
         *(otype*)po = expr; pi += is; po += os;\
     }\
     while(po < end){\
         *(otype*)po = expr; pi += is; po += os;\
     }\

 }
 
 //FIXME put things below under ifdefs so we do not waste space for cases no codec will need
 CONV_FUNC(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_U8 ,  *(const uint8_t*)pi)

 CONV_FUNC(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80U)<<8)
 CONV_FUNC(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80U)<<24)

 CONV_FUNC(AV_SAMPLE_FMT_FLT, float  , AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0f/ (1<<7)))

 CONV_FUNC(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
 CONV_FUNC(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_S16, (*(const int16_t*)pi>>8) + 0x80)
 CONV_FUNC(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_S16,  *(const int16_t*)pi)
 CONV_FUNC(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_S16,  *(const int16_t*)pi<<16)

 CONV_FUNC(AV_SAMPLE_FMT_FLT, float  , AV_SAMPLE_FMT_S16,  *(const int16_t*)pi*(1.0f/ (1<<15)))

 CONV_FUNC(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_S16,  *(const int16_t*)pi*(1.0 / (1<<15)))
 CONV_FUNC(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_S32, (*(const int32_t*)pi>>24) + 0x80)
 CONV_FUNC(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_S32,  *(const int32_t*)pi>>16)
 CONV_FUNC(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_S32,  *(const int32_t*)pi)

 CONV_FUNC(AV_SAMPLE_FMT_FLT, float  , AV_SAMPLE_FMT_S32,  *(const int32_t*)pi*(1.0f/ (1U<<31)))

 CONV_FUNC(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_S32,  *(const int32_t*)pi*(1.0 / (1U<<31)))
 CONV_FUNC(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_FLT, av_clip_uint8(  lrintf(*(const float*)pi * (1<<7)) + 0x80))
 CONV_FUNC(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, av_clip_int16(  lrintf(*(const float*)pi * (1<<15))))
 CONV_FUNC(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, av_clipl_int32(llrintf(*(const float*)pi * (1U<<31))))
 CONV_FUNC(AV_SAMPLE_FMT_FLT, float  , AV_SAMPLE_FMT_FLT, *(const float*)pi)
 CONV_FUNC(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_FLT, *(const float*)pi)
 CONV_FUNC(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_DBL, av_clip_uint8(  lrint(*(const double*)pi * (1<<7)) + 0x80))
 CONV_FUNC(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, av_clip_int16(  lrint(*(const double*)pi * (1<<15))))
 CONV_FUNC(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, av_clipl_int32(llrint(*(const double*)pi * (1U<<31))))
 CONV_FUNC(AV_SAMPLE_FMT_FLT, float  , AV_SAMPLE_FMT_DBL, *(const double*)pi)
 CONV_FUNC(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_DBL, *(const double*)pi)
 

 #define FMT_PAIR_FUNC(out, in) [(out) + AV_SAMPLE_FMT_NB*(in)] = CONV_FUNC_NAME(out, in)

 static conv_func_type * const fmt_pair_to_conv_functions[AV_SAMPLE_FMT_NB*AV_SAMPLE_FMT_NB] = {

     FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8 , AV_SAMPLE_FMT_U8 ),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_U8 ),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_U8 ),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_U8 ),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_U8 ),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8 , AV_SAMPLE_FMT_S16),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S16),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S16),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_S16),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8 , AV_SAMPLE_FMT_S32),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S32),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S32),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_S32),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8 , AV_SAMPLE_FMT_FLT),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_FLT),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_FLT),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLT),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_FLT),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8 , AV_SAMPLE_FMT_DBL),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_DBL),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_DBL),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_DBL),
     FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBL),
 };
 

 static void cpy1(uint8_t **dst, const uint8_t **src, int len){

     memcpy(*dst, *src, len);
 }

 static void cpy2(uint8_t **dst, const uint8_t **src, int len){
     memcpy(*dst, *src, 2*len);
 }
 static void cpy4(uint8_t **dst, const uint8_t **src, int len){
     memcpy(*dst, *src, 4*len);
 }
 static void cpy8(uint8_t **dst, const uint8_t **src, int len){
     memcpy(*dst, *src, 8*len);
 }

 AudioConvert *swri_audio_convert_alloc(enum AVSampleFormat out_fmt,
                                        enum AVSampleFormat in_fmt,
                                        int channels, const int *ch_map,
                                        int flags)

 {

     AudioConvert *ctx;

     conv_func_type *f = fmt_pair_to_conv_functions[av_get_packed_sample_fmt(out_fmt) + AV_SAMPLE_FMT_NB*av_get_packed_sample_fmt(in_fmt)];

 
     if (!f)
         return NULL;

     ctx = av_mallocz(sizeof(*ctx));

     if (!ctx)
         return NULL;

 
     if(channels == 1){
          in_fmt = av_get_planar_sample_fmt( in_fmt);
         out_fmt = av_get_planar_sample_fmt(out_fmt);
     }
 

     ctx->channels = channels;

     ctx->conv_f   = f;

     ctx->ch_map   = ch_map;

     if (in_fmt == AV_SAMPLE_FMT_U8 || in_fmt == AV_SAMPLE_FMT_U8P)

         memset(ctx->silence, 0x80, sizeof(ctx->silence));

     if(out_fmt == in_fmt && !ch_map) {
         switch(av_get_bytes_per_sample(in_fmt)){
             case 1:ctx->simd_f = cpy1; break;
             case 2:ctx->simd_f = cpy2; break;
             case 4:ctx->simd_f = cpy4; break;
             case 8:ctx->simd_f = cpy8; break;
         }
     }

     if(HAVE_YASM && HAVE_MMX) swri_audio_convert_init_x86(ctx, out_fmt, in_fmt, channels);

     if(ARCH_ARM)              swri_audio_convert_init_arm(ctx, out_fmt, in_fmt, channels);

     if(ARCH_AARCH64)          swri_audio_convert_init_aarch64(ctx, out_fmt, in_fmt, channels);

     return ctx;
 }
 

 void swri_audio_convert_free(AudioConvert **ctx)

 {
     av_freep(ctx);
 }
 

 int swri_audio_convert(AudioConvert *ctx, AudioData *out, AudioData *in, int len)

 {
     int ch;

     int off=0;
     const int os= (out->planar ? 1 :out->ch_count) *out->bps;

     unsigned misaligned = 0;

 
     av_assert0(ctx->channels == out->ch_count);
 

     if (ctx->in_simd_align_mask) {
         int planes = in->planar ? in->ch_count : 1;
         unsigned m = 0;
         for (ch = 0; ch < planes; ch++)
             m |= (intptr_t)in->ch[ch];
         misaligned |= m & ctx->in_simd_align_mask;
     }
     if (ctx->out_simd_align_mask) {
         int planes = out->planar ? out->ch_count : 1;
         unsigned m = 0;
         for (ch = 0; ch < planes; ch++)
             m |= (intptr_t)out->ch[ch];
         misaligned |= m & ctx->out_simd_align_mask;
     }
 

     //FIXME optimize common cases
 

     if(ctx->simd_f && !ctx->ch_map && !misaligned){

         off = len&~15;

         av_assert1(off>=0);
         av_assert1(off<=len);

         av_assert2(ctx->channels == SWR_CH_MAX || !in->ch[ctx->channels]);

         if(off>0){
             if(out->planar == in->planar){
                 int planes = out->planar ? out->ch_count : 1;
                 for(ch=0; ch<planes; ch++){

                     ctx->simd_f(out->ch+ch, (const uint8_t **)in->ch+ch, off * (out->planar ? 1 :out->ch_count));

                 }
             }else{

                 ctx->simd_f(out->ch, (const uint8_t **)in->ch, off);

             }
         }

         if(off == len)
             return 0;
     }
 

     for(ch=0; ch<ctx->channels; ch++){

         const int ich= ctx->ch_map ? ctx->ch_map[ch] : ch;
         const int is= ich < 0 ? 0 : (in->planar ? 1 : in->ch_count) * in->bps;

         const uint8_t *pi= ich < 0 ? ctx->silence : in->ch[ich];

         uint8_t       *po= out->ch[ch];
         uint8_t *end= po + os*len;
         if(!po)
             continue;

         ctx->conv_f(po+off*os, pi+off*is, is, os, end);

     }
     return 0;
 }