Libavcodec'i kullanarak sesi çöz ve libAO'yu kullanarak oyna?

Question

Ses dosyalarını çözmek için (MP3, WAV, WMV ile test edilmiştir) aşağıdaki kod snippet'ini kullanıyorum.

Ancak ses çaldığında, yalnızca statik sesler verir ve zaman zaman çöküyor. Burada yanlış yaptığım şeyler hakkında herhangi bir ipucu var mı?

#include <stdlib.h> 
#include <stdio.h> 
#include <string.h> 
#include <math.h> 


extern "C" { 
#include "libavutil/mathematics.h" 
#include "libavformat/avformat.h" 
#include "libswscale/swscale.h" 
#include <ao/ao.h> 

} 

void die(const char *msg) 
{ 
    fprintf(stderr,"%s\n",msg); 
    exit(1); 
} 

int main(int argc, char **argv) 
{ 

    const char* input_filename=argv[1]; 

    //avcodec_register_all(); 
    av_register_all(); 
    //av_ini 

    AVFormatContext* container=avformat_alloc_context(); 
    if(avformat_open_input(&container,input_filename,NULL,NULL)<0){ 
     die("Could not open file"); 
    } 

    if(av_find_stream_info(container)<0){ 
     die("Could not find file info"); 
    } 
    av_dump_format(container,0,input_filename,false); 

    int stream_id=-1; 
    int i; 
    for(i=0;i<container->nb_streams;i++){ 
     if(container->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO){ 
      stream_id=i; 
      break; 
     } 
    } 
    if(stream_id==-1){ 
     die("Could not find Audio Stream"); 
    } 

    AVDictionary *metadata=container->metadata; 

    AVCodecContext *ctx=container->streams[stream_id]->codec; 
    AVCodec *codec=avcodec_find_decoder(ctx->codec_id); 

    if(codec==NULL){ 
     die("cannot find codec!"); 
    } 

    if(avcodec_open(ctx,codec)<0){ 
     die("Codec cannot be found"); 
    } 

    //ctx=avcodec_alloc_context3(codec); 

    //initialize AO lib 
    ao_initialize(); 

    int driver=ao_default_driver_id(); 

    ao_sample_format sformat; 
    sformat.bits=16; 
    sformat.channels=2; 
    sformat.rate=44100; 
    sformat.byte_format=AO_FMT_NATIVE; 
    sformat.matrix=0; 

    ao_device *adevice=ao_open_live(driver,&sformat,NULL); 
    //end of init AO LIB 

    AVPacket packet; 
    av_init_packet(&packet); 

    AVFrame *frame=avcodec_alloc_frame(); 

    int buffer_size=AVCODEC_MAX_AUDIO_FRAME_SIZE; 
    uint8_t buffer[buffer_size]; 
    packet.data=buffer; 
    packet.size =buffer_size; 



    int len; 
    int frameFinished=0; 
    while(av_read_frame(container,&packet)>=0) 
    { 

     if(packet.stream_index==stream_id){ 
      //printf("Audio Frame read \n"); 
      int len=avcodec_decode_audio4(ctx,frame,&frameFinished,&packet); 
      //frame-> 
      if(frameFinished){ 
       //printf("Finished reading Frame %d %d\n",packet.size,len); 
       ao_play(adevice, (char*)frame->data, len); 
      } 

     } 


    } 

    av_close_input_file(container); 
    ao_shutdown(); 
    return 0; 
} 

Answer 1

Tamam, burada çalışma kodu örnek: bir düzlemsel ses destek eklendi

int main(int argc, char **argv) 
{ 

    const char* input_filename=argv[1]; 

    //avcodec_register_all(); 
    av_register_all(); 
    //av_ini 

    AVFormatContext* container=avformat_alloc_context(); 
    if(avformat_open_input(&container,input_filename,NULL,NULL)<0){ 
     die("Could not open file"); 
    } 

    if(av_find_stream_info(container)<0){ 
     die("Could not find file info"); 
    } 
    av_dump_format(container,0,input_filename,false); 

    int stream_id=-1; 
    int i; 
    for(i=0;i<container->nb_streams;i++){ 
     if(container->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO){ 
      stream_id=i; 
      break; 
     } 
    } 
    if(stream_id==-1){ 
     die("Could not find Audio Stream"); 
    } 

    AVDictionary *metadata=container->metadata; 

    AVCodecContext *ctx=container->streams[stream_id]->codec; 
    AVCodec *codec=avcodec_find_decoder(ctx->codec_id); 

    if(codec==NULL){ 
     die("cannot find codec!"); 
    } 

    if(avcodec_open(ctx,codec)<0){ 
     die("Codec cannot be found"); 
    } 

    //ctx=avcodec_alloc_context3(codec); 

    //initialize AO lib 
    ao_initialize(); 

    int driver=ao_default_driver_id(); 

    ao_sample_format sformat; 
    AVSampleFormat sfmt=ctx->sample_fmt; 
    if(sfmt==AV_SAMPLE_FMT_U8){ 
     printf("U8\n"); 

     sformat.bits=8; 
    }else if(sfmt==AV_SAMPLE_FMT_S16){ 
     printf("S16\n"); 
     sformat.bits=16; 
    }else if(sfmt==AV_SAMPLE_FMT_S32){ 
     printf("S32\n"); 
     sformat.bits=32; 
    } 

    sformat.channels=ctx->channels; 
    sformat.rate=ctx->sample_rate; 
    sformat.byte_format=AO_FMT_NATIVE; 
    sformat.matrix=0; 

    ao_device *adevice=ao_open_live(driver,&sformat,NULL); 
    //end of init AO LIB 

    AVPacket packet; 
    av_init_packet(&packet); 

    AVFrame *frame=avcodec_alloc_frame(); 



    int buffer_size=AVCODEC_MAX_AUDIO_FRAME_SIZE+ FF_INPUT_BUFFER_PADDING_SIZE;; 
    uint8_t buffer[buffer_size]; 
    packet.data=buffer; 
    packet.size =buffer_size; 



    int len; 
    int frameFinished=0; 
    while(av_read_frame(container,&packet)>=0) 
    { 

     if(packet.stream_index==stream_id){ 
      //printf("Audio Frame read \n"); 
      int len=avcodec_decode_audio4(ctx,frame,&frameFinished,&packet); 
      //frame-> 
      if(frameFinished){ 
       //printf("Finished reading Frame len : %d , nb_samples:%d buffer_size:%d line size: %d \n",len,frame->nb_samples,buffer_size,frame->linesize[0]); 
       ao_play(adevice, (char*)frame->extended_data[0],frame->linesize[0]); 
      }else{ 
       //printf("Not Finished\n"); 
      } 

     }else { 
      printf("Someother packet possibly Video\n"); 
     } 


    } 

    av_close_input_file(container); 
    ao_shutdown(); 
    return 0; 
}