#include?
#include?
#include?
#include?
#include?
#include?

void?ffmpeg_fmt_to_alsa_fmt（AVCodecContext?*pCodecCtx?snd_pcm_t?*pcm?snd_pcm_hw_params_t?*params）?//設置位數
{
	printf（“fmt:%d\n“pCodecCtx->sample_fmt）;
????switch（pCodecCtx->sample_fmt）?{
????case?AV_SAMPLE_FMT_U8:
????????snd_pcm_hw_params_set_format（pcm?params?SND_PCM_FORMAT_S8）;
????????break;
????case?AV_SAMPLE_FMT_S16:
????????snd_pcm_hw_params_set_format（pcm?params?SND_PCM_FORMAT_S16）;
????????break;
????case?AV_SAMPLE_FMT_S32:
	snd_pcm_hw_params_set_format（pcm?params?SND_PCM_FORMAT_S32）;
????????break;
????default:
	snd_pcm_hw_params_set_format（pcm?params?SND_PCM_FORMAT_S16）;
????????break;
????}
}

void?display_codec_ctx（AVCodecContext?*pCocecCtx）
{
????printf（“fmt:?%d%d\n“?pCocecCtx->sample_fmtAV_SAMPLE_FMT_S16）;
????printf（“channels:?%d\n“?pCocecCtx->channels）;
????printf（“time:?%d\n“?pCocecCtx->time_base）;
}

long?vol;

void?*thrHdlr（void?*arg）?{
????char?c;
????snd_mixer_elem_t?*elem?=?（snd_mixer_elem_t?*）arg;
????
????while?（1）?{
????????c?=?getchar（）;
????????if?（c?==?119）?{
????????????snd_mixer_selem_set_playback_volume_all（elem?vol?+=?2000）;
????????}?else?if?（c?==?115）?{
????????????snd_mixer_selem_set_playback_volume_all（elem?vol?-=?2000）;
????????}
????}
????return?（（void?*）0）;
}

void?*?convertAV_SAMPLE_FMT_FLTP_TO_S16P（const?AVframe?*frame）?//?float?轉?16位?
{
	if（frame?==?NULL）
	{
		printf（“frmae==?NULL\n“）;
		return;
	}
	
	int?in_samples?=?frame->nb_samples;
	
	short?*sample_buffer?=?（short*）malloc（frame->nb_samples*2*2）;
	memset（sample_buffer0frame->nb_samples*4）;
	
	int?i=0;
	float*?inputChanne10?=?（float*）（frame->extended_data[0]）;
	
	if（frame->channels?==?1）
	{
		for（i?=?0?;?i		{
			float?sample?=?*inputChanne10++;
			if（sample				sample=-1.0f;
			else?if（sample?>1.0f）
				sample?=?1.0f;
			sample_buffer[i]?=?（int16_t）（sample*32767.0f）;
		}
	}
	else
	{
		float?*inputChannel1?=?（float*）（frame->extended_data[1]）;
		for（i?=?0;?i		{
	
			float?sample1?=?*inputChanne10++;
			if（sample1				sample1=-1.0f;
			else?if（sample1?>1.0f）
				sample1?=?1.0f;
	
		????float?sample2?=?*inputChannel1++;
			if（sample2				sample2=-1.0f;
			else?if（sample2?>1.0f）
				sample2?=?1.0f;
	
			sample_buffer[i*2]?=?（int16_t）（sample1*32767.0f）;
			sample_buffer[i*2+1]?=?（int16_t）（sample2?*?32767.0f）;
		}
		
		
	}
	
	return?sample_buffer;
}

int?writeframe（AVframe?*decoded_frame?AVPacket?*pkt?AVCodecContext?*pInCodecCtx?snd_pcm_t*?pcm）??
{??
????int?got_frame?=?0;
????int?len?=?0;??

????while?（pkt->size?>?0）??
????{??
????????if?（!decoded_frame）??
????????{??
????????????if?（!（decoded_frame?=?av_frame_alloc（）））??
????????????{??
????????????????decoded_frame?=?NULL;??
????????????????return?-1;??
????