libavcodec/wmaenc.c - vendor/opensource/ffmpeg - Git at Google

 /*
  * WMA compatible encoder
  * Copyright (c) 2007 Michael Niedermayer
  *
  * 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 "avcodec.h"
 #include "wma.h"

 #undef NDEBUG
 #include <assert.h>


 static int encode_init(AVCodecContext * avctx){
     WMACodecContext *s = avctx->priv_data;
     int i, flags1, flags2;
     uint8_t *extradata;

     s->avctx = avctx;

     if(avctx->channels > MAX_CHANNELS)
         return -1;

     if(avctx->bit_rate < 24*1000)
         return -1;

     /* extract flag infos */
     flags1 = 0;
     flags2 = 1;
     if (avctx->codec->id == CODEC_ID_WMAV1) {
         extradata= av_malloc(4);
         avctx->extradata_size= 4;
         AV_WL16(extradata, flags1);
         AV_WL16(extradata+2, flags2);
     } else if (avctx->codec->id == CODEC_ID_WMAV2) {
         extradata= av_mallocz(10);
         avctx->extradata_size= 10;
         AV_WL32(extradata, flags1);
         AV_WL16(extradata+4, flags2);
     }else
         assert(0);
     avctx->extradata= extradata;
     s->use_exp_vlc = flags2 & 0x0001;
     s->use_bit_reservoir = flags2 & 0x0002;
     s->use_variable_block_len = flags2 & 0x0004;

     ff_wma_init(avctx, flags2);

     /* init MDCT */
     for(i = 0; i < s->nb_block_sizes; i++)
         ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 0);

     avctx->block_align=
     s->block_align= avctx->bit_rate*(int64_t)s->frame_len / (avctx->sample_rate*8);
 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d\n", s->block_align, avctx->bit_rate, s->frame_len, avctx->sample_rate);
     avctx->frame_size= s->frame_len;

     return 0;
 }


 static void apply_window_and_mdct(AVCodecContext * avctx, signed short * audio, int len) {
     WMACodecContext *s = avctx->priv_data;
     int window_index= s->frame_len_bits - s->block_len_bits;
     int i, j, channel;
     const float * win = s->windows[window_index];
     int window_len = 1 << s->block_len_bits;
     float n = window_len/2;

     for (channel = 0; channel < avctx->channels; channel++) {
         memcpy(s->output, s->frame_out[channel], sizeof(float)*window_len);
         j = channel;
         for (i = 0; i < len; i++, j += avctx->channels){
             s->output[i+window_len]  = audio[j] / n * win[window_len - i - 1];
             s->frame_out[channel][i] = audio[j] / n * win[i];
         }
         ff_mdct_calc(&s->mdct_ctx[window_index], s->coefs[channel], s->output);
     }
 }

 //FIXME use for decoding too
 static void init_exp(WMACodecContext *s, int ch, const int *exp_param){
     int n;
     const uint16_t *ptr;
     float v, *q, max_scale, *q_end;

     ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
     q = s->exponents[ch];
     q_end = q + s->block_len;
     max_scale = 0;
     while (q < q_end) {
         /* XXX: use a table */
         v = pow(10, *exp_param++ * (1.0 / 16.0));
         max_scale= FFMAX(max_scale, v);
         n = *ptr++;
         do {
             *q++ = v;
         } while (--n);
     }
     s->max_exponent[ch] = max_scale;
 }

 static void encode_exp_vlc(WMACodecContext *s, int ch, const int *exp_param){
     int last_exp;
     const uint16_t *ptr;
     float *q, *q_end;

     ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
     q = s->exponents[ch];
     q_end = q + s->block_len;
     if (s->version == 1) {
         last_exp= *exp_param++;
         assert(last_exp-10 >= 0 && last_exp-10 < 32);
         put_bits(&s->pb, 5, last_exp - 10);
         q+= *ptr++;
     }else
         last_exp = 36;
     while (q < q_end) {
         int exp = *exp_param++;
         int code = exp - last_exp + 60;
         assert(code >= 0 && code < 120);
         put_bits(&s->pb, ff_wma_scale_huffbits[code], ff_wma_scale_huffcodes[code]);
         /* XXX: use a table */
         q+= *ptr++;
         last_exp= exp;
     }
 }

 static int encode_block(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], int total_gain){
     int v, bsize, ch, coef_nb_bits, parse_exponents;
     float mdct_norm;
     int nb_coefs[MAX_CHANNELS];
     static const int fixed_exp[25]={20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20};

     //FIXME remove duplication relative to decoder
     if (s->use_variable_block_len) {
         assert(0); //FIXME not implemented
     }else{
         /* fixed block len */
         s->next_block_len_bits = s->frame_len_bits;
         s->prev_block_len_bits = s->frame_len_bits;
         s->block_len_bits = s->frame_len_bits;
     }

     s->block_len = 1 << s->block_len_bits;
 //     assert((s->block_pos + s->block_len) <= s->frame_len);
     bsize = s->frame_len_bits - s->block_len_bits;

     //FIXME factor
     v = s->coefs_end[bsize] - s->coefs_start;
     for(ch = 0; ch < s->nb_channels; ch++)
         nb_coefs[ch] = v;
     {
         int n4 = s->block_len / 2;
         mdct_norm = 1.0 / (float)n4;
         if (s->version == 1) {
             mdct_norm *= sqrt(n4);
         }
     }

     if (s->nb_channels == 2) {
         put_bits(&s->pb, 1, s->ms_stereo= 1);
     }

     for(ch = 0; ch < s->nb_channels; ch++) {
         s->channel_coded[ch] = 1; //FIXME only set channel_coded when needed, instead of always
         if (s->channel_coded[ch]) {
             init_exp(s, ch, fixed_exp);
         }
     }

     for(ch = 0; ch < s->nb_channels; ch++) {
         if (s->channel_coded[ch]) {
             int16_t *coefs1;
             float *coefs, *exponents, mult;
             int i, n;

             coefs1 = s->coefs1[ch];
             exponents = s->exponents[ch];
             mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
             mult *= mdct_norm;
             coefs = src_coefs[ch];
             if (s->use_noise_coding && 0) {
                 assert(0); //FIXME not implemented
             } else {
                 coefs += s->coefs_start;
                 n = nb_coefs[ch];
                 for(i = 0;i < n; i++){
                     double t= *coefs++ / (exponents[i] * mult);
                     if(t<-32768 || t>32767)
                         return -1;

                     coefs1[i] = lrint(t);
                 }
             }
         }
     }

     v = 0;
     for(ch = 0; ch < s->nb_channels; ch++) {
         int a = s->channel_coded[ch];
         put_bits(&s->pb, 1, a);
         v |= a;
     }

     if (!v)
         return 1;

     for(v= total_gain-1; v>=127; v-= 127)
         put_bits(&s->pb, 7, 127);
     put_bits(&s->pb, 7, v);

     coef_nb_bits= ff_wma_total_gain_to_bits(total_gain);

     if (s->use_noise_coding) {
         for(ch = 0; ch < s->nb_channels; ch++) {
             if (s->channel_coded[ch]) {
                 int i, n;
                 n = s->exponent_high_sizes[bsize];
                 for(i=0;i<n;i++) {
                     put_bits(&s->pb, 1, s->high_band_coded[ch][i]= 0);
                     if (0)
                         nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
                 }
             }
         }
     }

     parse_exponents = 1;
     if (s->block_len_bits != s->frame_len_bits) {
         put_bits(&s->pb, 1, parse_exponents);
     }

     if (parse_exponents) {
         for(ch = 0; ch < s->nb_channels; ch++) {
             if (s->channel_coded[ch]) {
                 if (s->use_exp_vlc) {
                     encode_exp_vlc(s, ch, fixed_exp);
                 } else {
                     assert(0); //FIXME not implemented
 //                    encode_exp_lsp(s, ch);
                 }
             }
         }
     } else {
         assert(0); //FIXME not implemented
     }

     for(ch = 0; ch < s->nb_channels; ch++) {
         if (s->channel_coded[ch]) {
             int run, tindex;
             int16_t *ptr, *eptr;
             tindex = (ch == 1 && s->ms_stereo);
             ptr = &s->coefs1[ch][0];
             eptr = ptr + nb_coefs[ch];

             run=0;
             for(;ptr < eptr; ptr++){
                 if(*ptr){
                     int level= *ptr;
                     int abs_level= FFABS(level);
                     int code= 0;
                     if(abs_level <= s->coef_vlcs[tindex]->max_level){
                         if(run < s->coef_vlcs[tindex]->levels[abs_level-1])
                             code= run + s->int_table[tindex][abs_level-1];
                     }

                     assert(code < s->coef_vlcs[tindex]->n);
                     put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[code], s->coef_vlcs[tindex]->huffcodes[code]);

                     if(code == 0){
                         if(1<<coef_nb_bits <= abs_level)
                             return -1;


                         //Workaround minor rounding differences for the regression tests, FIXME we should find and replace the problematic float by fixpoint for reg tests
                         if(abs_level == 0x71B && (s->avctx->flags & CODEC_FLAG_BITEXACT)) abs_level=0x71A;

                         put_bits(&s->pb, coef_nb_bits, abs_level);
                         put_bits(&s->pb, s->frame_len_bits, run);
                     }
                     put_bits(&s->pb, 1, level < 0); //FIXME the sign is fliped somewhere
                     run=0;
                 }else{
                     run++;
                 }
             }
             if(run)
                 put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[1], s->coef_vlcs[tindex]->huffcodes[1]);
         }
         if (s->version == 1 && s->nb_channels >= 2) {
             align_put_bits(&s->pb);
         }
     }
     return 0;
 }

 static int encode_frame(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], uint8_t *buf, int buf_size, int total_gain){
     init_put_bits(&s->pb, buf, buf_size);

     if (s->use_bit_reservoir) {
         assert(0);//FIXME not implemented
     }else{
         if(encode_block(s, src_coefs, total_gain) < 0)
             return INT_MAX;
     }

     align_put_bits(&s->pb);

     return put_bits_count(&s->pb)/8 - s->block_align;
 }

 static int encode_superframe(AVCodecContext *avctx,
                             unsigned char *buf, int buf_size, void *data){
     WMACodecContext *s = avctx->priv_data;
     short *samples = data;
     int i, total_gain;

     s->block_len_bits= s->frame_len_bits; //required by non variable block len
     s->block_len = 1 << s->block_len_bits;

     apply_window_and_mdct(avctx, samples, avctx->frame_size);

     if (s->ms_stereo) {
         float a, b;
         int i;

         for(i = 0; i < s->block_len; i++) {
             a = s->coefs[0][i]*0.5;
             b = s->coefs[1][i]*0.5;
             s->coefs[0][i] = a + b;
             s->coefs[1][i] = a - b;
         }
     }

 #if 1
     total_gain= 128;
     for(i=64; i; i>>=1){
         int error= encode_frame(s, s->coefs, buf, buf_size, total_gain-i);
         if(error<0)
             total_gain-= i;
     }
 #else
     total_gain= 90;
     best= encode_frame(s, s->coefs, buf, buf_size, total_gain);
     for(i=32; i; i>>=1){
         int scoreL= encode_frame(s, s->coefs, buf, buf_size, total_gain-i);
         int scoreR= encode_frame(s, s->coefs, buf, buf_size, total_gain+i);
         av_log(NULL, AV_LOG_ERROR, "%d %d %d (%d)\n", scoreL, best, scoreR, total_gain);
         if(scoreL < FFMIN(best, scoreR)){
             best = scoreL;
             total_gain -= i;
         }else if(scoreR < best){
             best = scoreR;
             total_gain += i;
         }
     }
 #endif

     encode_frame(s, s->coefs, buf, buf_size, total_gain);
     assert((put_bits_count(&s->pb) & 7) == 0);
     i= s->block_align - (put_bits_count(&s->pb)+7)/8;
     assert(i>=0);
     while(i--)
         put_bits(&s->pb, 8, 'N');

     flush_put_bits(&s->pb);
     return pbBufPtr(&s->pb) - s->pb.buf;
 }

 AVCodec wmav1_encoder =
 {
     "wmav1",
     CODEC_TYPE_AUDIO,
     CODEC_ID_WMAV1,
     sizeof(WMACodecContext),
     encode_init,
     encode_superframe,
     ff_wma_end,
     .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
     .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
 };

 AVCodec wmav2_encoder =
 {
     "wmav2",
     CODEC_TYPE_AUDIO,
     CODEC_ID_WMAV2,
     sizeof(WMACodecContext),
     encode_init,
     encode_superframe,
     ff_wma_end,
     .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
     .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
 };
	/*
	* WMA compatible encoder
	* Copyright (c) 2007 Michael Niedermayer
	*
	* 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 "avcodec.h"
	#include "wma.h"

	#undef NDEBUG
	#include <assert.h>


	static int encode_init(AVCodecContext * avctx){
	WMACodecContext *s = avctx->priv_data;
	int i, flags1, flags2;
	uint8_t *extradata;

	s->avctx = avctx;

	if(avctx->channels > MAX_CHANNELS)
	return -1;

	if(avctx->bit_rate < 24*1000)
	return -1;

	/* extract flag infos */
	flags1 = 0;
	flags2 = 1;
	if (avctx->codec->id == CODEC_ID_WMAV1) {
	extradata= av_malloc(4);
	avctx->extradata_size= 4;
	AV_WL16(extradata, flags1);
	AV_WL16(extradata+2, flags2);
	} else if (avctx->codec->id == CODEC_ID_WMAV2) {
	extradata= av_mallocz(10);
	avctx->extradata_size= 10;
	AV_WL32(extradata, flags1);
	AV_WL16(extradata+4, flags2);
	}else
	assert(0);
	avctx->extradata= extradata;
	s->use_exp_vlc = flags2 & 0x0001;
	s->use_bit_reservoir = flags2 & 0x0002;
	s->use_variable_block_len = flags2 & 0x0004;

	ff_wma_init(avctx, flags2);

	/* init MDCT */
	for(i = 0; i < s->nb_block_sizes; i++)
	ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 0);

	avctx->block_align=
	s->block_align= avctx->bit_rate(int64_t)s->frame_len / (avctx->sample_rate8);
	//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d\n", s->block_align, avctx->bit_rate, s->frame_len, avctx->sample_rate);
	avctx->frame_size= s->frame_len;

	return 0;
	}


	static void apply_window_and_mdct(AVCodecContext * avctx, signed short * audio, int len) {
	WMACodecContext *s = avctx->priv_data;
	int window_index= s->frame_len_bits - s->block_len_bits;
	int i, j, channel;
	const float * win = s->windows[window_index];
	int window_len = 1 << s->block_len_bits;
	float n = window_len/2;

	for (channel = 0; channel < avctx->channels; channel++) {
	memcpy(s->output, s->frame_out[channel], sizeof(float)*window_len);
	j = channel;
	for (i = 0; i < len; i++, j += avctx->channels){
	s->output[i+window_len] = audio[j] / n * win[window_len - i - 1];
	s->frame_out[channel][i] = audio[j] / n * win[i];
	}
	ff_mdct_calc(&s->mdct_ctx[window_index], s->coefs[channel], s->output);
	}
	}

	//FIXME use for decoding too
	static void init_exp(WMACodecContext s, int ch, const int exp_param){
	int n;
	const uint16_t *ptr;
	float v, q, max_scale, q_end;

	ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
	q = s->exponents[ch];
	q_end = q + s->block_len;
	max_scale = 0;
	while (q < q_end) {
	/* XXX: use a table */
	v = pow(10, exp_param++ (1.0 / 16.0));
	max_scale= FFMAX(max_scale, v);
	n = *ptr++;
	do {
	*q++ = v;
	} while (--n);
	}
	s->max_exponent[ch] = max_scale;
	}

	static void encode_exp_vlc(WMACodecContext s, int ch, const int exp_param){
	int last_exp;
	const uint16_t *ptr;
	float q, q_end;

	ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
	q = s->exponents[ch];
	q_end = q + s->block_len;
	if (s->version == 1) {
	last_exp= *exp_param++;
	assert(last_exp-10 >= 0 && last_exp-10 < 32);
	put_bits(&s->pb, 5, last_exp - 10);
	q+= *ptr++;
	}else
	last_exp = 36;
	while (q < q_end) {
	int exp = *exp_param++;
	int code = exp - last_exp + 60;
	assert(code >= 0 && code < 120);
	put_bits(&s->pb, ff_wma_scale_huffbits[code], ff_wma_scale_huffcodes[code]);
	/* XXX: use a table */
	q+= *ptr++;
	last_exp= exp;
	}
	}

	static int encode_block(WMACodecContext s, float (src_coefs)[BLOCK_MAX_SIZE], int total_gain){
	int v, bsize, ch, coef_nb_bits, parse_exponents;
	float mdct_norm;
	int nb_coefs[MAX_CHANNELS];
	static const int fixed_exp[25]={20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20};

	//FIXME remove duplication relative to decoder
	if (s->use_variable_block_len) {
	assert(0); //FIXME not implemented
	}else{
	/* fixed block len */
	s->next_block_len_bits = s->frame_len_bits;
	s->prev_block_len_bits = s->frame_len_bits;
	s->block_len_bits = s->frame_len_bits;
	}

	s->block_len = 1 << s->block_len_bits;
	// assert((s->block_pos + s->block_len) <= s->frame_len);
	bsize = s->frame_len_bits - s->block_len_bits;

	//FIXME factor
	v = s->coefs_end[bsize] - s->coefs_start;
	for(ch = 0; ch < s->nb_channels; ch++)
	nb_coefs[ch] = v;
	{
	int n4 = s->block_len / 2;
	mdct_norm = 1.0 / (float)n4;
	if (s->version == 1) {
	mdct_norm *= sqrt(n4);
	}
	}

	if (s->nb_channels == 2) {
	put_bits(&s->pb, 1, s->ms_stereo= 1);
	}

	for(ch = 0; ch < s->nb_channels; ch++) {
	s->channel_coded[ch] = 1; //FIXME only set channel_coded when needed, instead of always
	if (s->channel_coded[ch]) {
	init_exp(s, ch, fixed_exp);
	}
	}

	for(ch = 0; ch < s->nb_channels; ch++) {
	if (s->channel_coded[ch]) {
	int16_t *coefs1;
	float coefs, exponents, mult;
	int i, n;

	coefs1 = s->coefs1[ch];
	exponents = s->exponents[ch];
	mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
	mult *= mdct_norm;
	coefs = src_coefs[ch];
	if (s->use_noise_coding && 0) {
	assert(0); //FIXME not implemented
	} else {
	coefs += s->coefs_start;
	n = nb_coefs[ch];
	for(i = 0;i < n; i++){
	double t= coefs++ / (exponents[i] mult);
	if(t<-32768 \|\| t>32767)
	return -1;

	coefs1[i] = lrint(t);
	}
	}
	}
	}

	v = 0;
	for(ch = 0; ch < s->nb_channels; ch++) {
	int a = s->channel_coded[ch];
	put_bits(&s->pb, 1, a);
	v \|= a;
	}

	if (!v)
	return 1;

	for(v= total_gain-1; v>=127; v-= 127)
	put_bits(&s->pb, 7, 127);
	put_bits(&s->pb, 7, v);

	coef_nb_bits= ff_wma_total_gain_to_bits(total_gain);

	if (s->use_noise_coding) {
	for(ch = 0; ch < s->nb_channels; ch++) {
	if (s->channel_coded[ch]) {
	int i, n;
	n = s->exponent_high_sizes[bsize];
	for(i=0;i<n;i++) {
	put_bits(&s->pb, 1, s->high_band_coded[ch][i]= 0);
	if (0)
	nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
	}
	}
	}
	}

	parse_exponents = 1;
	if (s->block_len_bits != s->frame_len_bits) {
	put_bits(&s->pb, 1, parse_exponents);
	}

	if (parse_exponents) {
	for(ch = 0; ch < s->nb_channels; ch++) {
	if (s->channel_coded[ch]) {
	if (s->use_exp_vlc) {
	encode_exp_vlc(s, ch, fixed_exp);
	} else {
	assert(0); //FIXME not implemented
	// encode_exp_lsp(s, ch);
	}
	}
	}
	} else {
	assert(0); //FIXME not implemented
	}

	for(ch = 0; ch < s->nb_channels; ch++) {
	if (s->channel_coded[ch]) {
	int run, tindex;
	int16_t ptr, eptr;
	tindex = (ch == 1 && s->ms_stereo);
	ptr = &s->coefs1[ch][0];
	eptr = ptr + nb_coefs[ch];

	run=0;
	for(;ptr < eptr; ptr++){
	if(*ptr){
	int level= *ptr;
	int abs_level= FFABS(level);
	int code= 0;
	if(abs_level <= s->coef_vlcs[tindex]->max_level){
	if(run < s->coef_vlcs[tindex]->levels[abs_level-1])
	code= run + s->int_table[tindex][abs_level-1];
	}

	assert(code < s->coef_vlcs[tindex]->n);
	put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[code], s->coef_vlcs[tindex]->huffcodes[code]);

	if(code == 0){
	if(1<<coef_nb_bits <= abs_level)
	return -1;


	//Workaround minor rounding differences for the regression tests, FIXME we should find and replace the problematic float by fixpoint for reg tests
	if(abs_level == 0x71B && (s->avctx->flags & CODEC_FLAG_BITEXACT)) abs_level=0x71A;

	put_bits(&s->pb, coef_nb_bits, abs_level);
	put_bits(&s->pb, s->frame_len_bits, run);
	}
	put_bits(&s->pb, 1, level < 0); //FIXME the sign is fliped somewhere
	run=0;
	}else{
	run++;
	}
	}
	if(run)
	put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[1], s->coef_vlcs[tindex]->huffcodes[1]);
	}
	if (s->version == 1 && s->nb_channels >= 2) {
	align_put_bits(&s->pb);
	}
	}
	return 0;
	}

	static int encode_frame(WMACodecContext s, float (src_coefs)[BLOCK_MAX_SIZE], uint8_t *buf, int buf_size, int total_gain){
	init_put_bits(&s->pb, buf, buf_size);

	if (s->use_bit_reservoir) {
	assert(0);//FIXME not implemented
	}else{
	if(encode_block(s, src_coefs, total_gain) < 0)
	return INT_MAX;
	}

	align_put_bits(&s->pb);

	return put_bits_count(&s->pb)/8 - s->block_align;
	}

	static int encode_superframe(AVCodecContext *avctx,
	unsigned char buf, int buf_size, void data){
	WMACodecContext *s = avctx->priv_data;
	short *samples = data;
	int i, total_gain;

	s->block_len_bits= s->frame_len_bits; //required by non variable block len
	s->block_len = 1 << s->block_len_bits;

	apply_window_and_mdct(avctx, samples, avctx->frame_size);

	if (s->ms_stereo) {
	float a, b;
	int i;

	for(i = 0; i < s->block_len; i++) {
	a = s->coefs[0][i]*0.5;
	b = s->coefs[1][i]*0.5;
	s->coefs[0][i] = a + b;
	s->coefs[1][i] = a - b;
	}
	}

	#if 1
	total_gain= 128;
	for(i=64; i; i>>=1){
	int error= encode_frame(s, s->coefs, buf, buf_size, total_gain-i);
	if(error<0)
	total_gain-= i;
	}
	#else
	total_gain= 90;
	best= encode_frame(s, s->coefs, buf, buf_size, total_gain);
	for(i=32; i; i>>=1){
	int scoreL= encode_frame(s, s->coefs, buf, buf_size, total_gain-i);
	int scoreR= encode_frame(s, s->coefs, buf, buf_size, total_gain+i);
	av_log(NULL, AV_LOG_ERROR, "%d %d %d (%d)\n", scoreL, best, scoreR, total_gain);
	if(scoreL < FFMIN(best, scoreR)){
	best = scoreL;
	total_gain -= i;
	}else if(scoreR < best){
	best = scoreR;
	total_gain += i;
	}
	}
	#endif

	encode_frame(s, s->coefs, buf, buf_size, total_gain);
	assert((put_bits_count(&s->pb) & 7) == 0);
	i= s->block_align - (put_bits_count(&s->pb)+7)/8;
	assert(i>=0);
	while(i--)
	put_bits(&s->pb, 8, 'N');

	flush_put_bits(&s->pb);
	return pbBufPtr(&s->pb) - s->pb.buf;
	}

	AVCodec wmav1_encoder =
	{
	"wmav1",
	CODEC_TYPE_AUDIO,
	CODEC_ID_WMAV1,
	sizeof(WMACodecContext),
	encode_init,
	encode_superframe,
	ff_wma_end,
	.sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
	.long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
	};

	AVCodec wmav2_encoder =
	{
	"wmav2",
	CODEC_TYPE_AUDIO,
	CODEC_ID_WMAV2,
	sizeof(WMACodecContext),
	encode_init,
	encode_superframe,
	ff_wma_end,
	.sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
	.long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
	};