libmpcodecs/ad_ffmpeg.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4
   5 #include "config.h"
   6 #include "mp_msg.h"
   7 #include "help_mp.h"
   8
   9 #include "ad_internal.h"
  10
  11 #include "bswap.h"
  12
  13 static ad_info_t info =
  14 {
  15         "FFmpeg/libavcodec audio decoders",
  16         "ffmpeg",
  17         "Nick Kurshev",
  18         "ffmpeg.sf.net",
  19         ""
  20 };
  21
  22 LIBAD_EXTERN(ffmpeg)
  23
  24 #define assert(x)
  25
  26 #ifdef USE_LIBAVCODEC_SO
  27 #include <ffmpeg/avcodec.h>
  28 #else
  29 #include "avcodec.h"
  30 #endif
  31
  32 extern int avcodec_inited;
  33
  34 static int preinit(sh_audio_t *sh)
  35 {
  36   sh->audio_out_minsize=AVCODEC_MAX_AUDIO_FRAME_SIZE;
  37   return 1;
  38 }
  39
  40 static int init(sh_audio_t *sh_audio)
  41 {
  42     int x;
  43     AVCodecContext *lavc_context;
  44     AVCodec *lavc_codec;
  45
  46     mp_msg(MSGT_DECAUDIO,MSGL_V,"FFmpeg's libavcodec audio codec\n");
  47     if(!avcodec_inited){
  48       avcodec_init();
  49       avcodec_register_all();
  50       avcodec_inited=1;
  51     }
  52
  53     lavc_codec = (AVCodec *)avcodec_find_decoder_by_name(sh_audio->codec->dll);
  54     if(!lavc_codec){
  55         mp_msg(MSGT_DECAUDIO,MSGL_ERR,MSGTR_MissingLAVCcodec,sh_audio->codec->dll);
  56         return 0;
  57     }
  58
  59     lavc_context = avcodec_alloc_context();
  60     sh_audio->context=lavc_context;
  61
  62     if(sh_audio->wf){
  63         lavc_context->channels = sh_audio->wf->nChannels;
  64         lavc_context->sample_rate = sh_audio->wf->nSamplesPerSec;
  65         lavc_context->bit_rate = sh_audio->wf->nAvgBytesPerSec * 8;
  66         lavc_context->block_align = sh_audio->wf->nBlockAlign;
  67         lavc_context->bits_per_sample = sh_audio->wf->wBitsPerSample;
  68     }
  69     lavc_context->codec_tag = sh_audio->format; //FOURCC
  70     lavc_context->codec_id = lavc_codec->id; // not sure if required, imho not --A'rpi
  71
  72     /* alloc extra data */
  73     if (sh_audio->wf && sh_audio->wf->cbSize > 0) {
  74         lavc_context->extradata = av_mallocz(sh_audio->wf->cbSize + FF_INPUT_BUFFER_PADDING_SIZE);
  75         lavc_context->extradata_size = sh_audio->wf->cbSize;
  76         memcpy(lavc_context->extradata, (char *)sh_audio->wf + sizeof(WAVEFORMATEX),
  77                lavc_context->extradata_size);
  78     }
  79
  80     // for QDM2
  81     if (sh_audio->codecdata_len && sh_audio->codecdata && !lavc_context->extradata)
  82     {
  83         lavc_context->extradata = av_malloc(sh_audio->codecdata_len);
  84         lavc_context->extradata_size = sh_audio->codecdata_len;
  85         memcpy(lavc_context->extradata, (char *)sh_audio->codecdata,
  86                lavc_context->extradata_size);
  87     }
  88
  89     /* open it */
  90     if (avcodec_open(lavc_context, lavc_codec) < 0) {
  91         mp_msg(MSGT_DECAUDIO,MSGL_ERR, MSGTR_CantOpenCodec);
  92         return 0;
  93     }
  94    mp_msg(MSGT_DECAUDIO,MSGL_V,"INFO: libavcodec init OK!\n");
  95
  96 //   printf("\nFOURCC: 0x%X\n",sh_audio->format);
  97    if(sh_audio->format==0x3343414D){
  98        // MACE 3:1
  99        sh_audio->ds->ss_div = 2*3; // 1 samples/packet
 100        sh_audio->ds->ss_mul = 2*sh_audio->wf->nChannels; // 1 byte*ch/packet
 101    } else
 102    if(sh_audio->format==0x3643414D){
 103        // MACE 6:1
 104        sh_audio->ds->ss_div = 2*6; // 1 samples/packet
 105        sh_audio->ds->ss_mul = 2*sh_audio->wf->nChannels; // 1 byte*ch/packet
 106    }
 107
 108    // Decode at least 1 byte:  (to get header filled)
 109    x=decode_audio(sh_audio,sh_audio->a_buffer,1,sh_audio->a_buffer_size);
 110    if(x>0) sh_audio->a_buffer_len=x;
 111
 112   sh_audio->channels=lavc_context->channels;
 113   sh_audio->samplerate=lavc_context->sample_rate;
 114   sh_audio->i_bps=lavc_context->bit_rate/8;
 115   if(sh_audio->wf){
 116       // If the decoder uses the wrong number of channels all is lost anyway.
 117       // sh_audio->channels=sh_audio->wf->nChannels;
 118       sh_audio->samplerate=sh_audio->wf->nSamplesPerSec;
 119       sh_audio->i_bps=sh_audio->wf->nAvgBytesPerSec;
 120   }
 121   sh_audio->samplesize=2;
 122   return 1;
 123 }
 124
 125 static void uninit(sh_audio_t *sh)
 126 {
 127     AVCodecContext *lavc_context = sh->context;
 128
 129     if (avcodec_close(lavc_context) < 0)
 130         mp_msg(MSGT_DECVIDEO, MSGL_ERR, MSGTR_CantCloseCodec);
 131     av_freep(&lavc_context->extradata);
 132     av_freep(&lavc_context);
 133 }
 134
 135 static int control(sh_audio_t *sh,int cmd,void* arg, ...)
 136 {
 137     AVCodecContext *lavc_context = sh->context;
 138     switch(cmd){
 139     case ADCTRL_RESYNC_STREAM:
 140         avcodec_flush_buffers(lavc_context);
 141     return CONTROL_TRUE;
 142     }
 143     return CONTROL_UNKNOWN;
 144 }
 145
 146 static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
 147 {
 148     unsigned char *start=NULL;
 149     int y,len=-1;
 150     while(len<minlen){
 151         int len2=0;
 152         double pts;
 153         int x=ds_get_packet_pts(sh_audio->ds,&start, &pts);
 154         if(x<=0) break; // error
 155         if (pts != MP_NOPTS_VALUE) {
 156             sh_audio->pts = pts;
 157             sh_audio->pts_bytes = 0;
 158         }
 159         y=avcodec_decode_audio(sh_audio->context,(int16_t*)buf,&len2,start,x);
 160 //printf("return:%d samples_out:%d bitstream_in:%d sample_sum:%d\n", y, len2, x, len); fflush(stdout);
 161         if(y<0){ mp_msg(MSGT_DECAUDIO,MSGL_V,"lavc_audio: error\n");break; }
 162         if(y<x) sh_audio->ds->buffer_pos+=y-x;  // put back data (HACK!)
 163         if(len2>0){
 164           //len=len2;break;
 165           if(len<0) len=len2; else len+=len2;
 166           buf+=len2;
 167           sh_audio->pts_bytes += len2;
 168         }
 169         mp_dbg(MSGT_DECAUDIO,MSGL_DBG2,"Decoded %d -> %d  \n",y,len2);
 170     }
 171   return len;
 172 }