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 #include "libaf/reorder_ch.h"
  11
  12 #include "mpbswap.h"
  13
  14 static const ad_info_t info =
  15 {
  16         "FFmpeg/libavcodec audio decoders",
  17         "ffmpeg",
  18         "Nick Kurshev",
  19         "ffmpeg.sf.net",
  20         ""
  21 };
  22
  23 LIBAD_EXTERN(ffmpeg)
  24
  25 #define assert(x)
  26
  27 #include "libavcodec/avcodec.h"
  28
  29 extern int avcodec_initialized;
  30
  31 static int preinit(sh_audio_t *sh)
  32 {
  33   sh->audio_out_minsize=AVCODEC_MAX_AUDIO_FRAME_SIZE;
  34   return 1;
  35 }
  36
  37 static int init(sh_audio_t *sh_audio)
  38 {
  39     int tries = 0;
  40     int x;
  41     AVCodecContext *lavc_context;
  42     AVCodec *lavc_codec;
  43
  44     mp_msg(MSGT_DECAUDIO,MSGL_V,"FFmpeg's libavcodec audio codec\n");
  45     if(!avcodec_initialized){
  46       avcodec_init();
  47       avcodec_register_all();
  48       avcodec_initialized=1;
  49     }
  50
  51     lavc_codec = (AVCodec *)avcodec_find_decoder_by_name(sh_audio->codec->dll);
  52     if(!lavc_codec){
  53         mp_tmsg(MSGT_DECAUDIO,MSGL_ERR,"Cannot find codec '%s' in libavcodec...\n",sh_audio->codec->dll);
  54         return 0;
  55     }
  56
  57     lavc_context = avcodec_alloc_context();
  58     sh_audio->context=lavc_context;
  59
  60     lavc_context->sample_rate = sh_audio->samplerate;
  61     lavc_context->bit_rate = sh_audio->i_bps * 8;
  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_coded_sample = sh_audio->wf->wBitsPerSample;
  68     }
  69     lavc_context->request_channels = audio_output_channels;
  70     lavc_context->codec_tag = sh_audio->format; //FOURCC
  71     lavc_context->codec_type = CODEC_TYPE_AUDIO;
  72     lavc_context->codec_id = lavc_codec->id; // not sure if required, imho not --A'rpi
  73
  74     /* alloc extra data */
  75     if (sh_audio->wf && sh_audio->wf->cbSize > 0) {
  76         lavc_context->extradata = av_mallocz(sh_audio->wf->cbSize + FF_INPUT_BUFFER_PADDING_SIZE);
  77         lavc_context->extradata_size = sh_audio->wf->cbSize;
  78         memcpy(lavc_context->extradata, (char *)sh_audio->wf + sizeof(WAVEFORMATEX),
  79                lavc_context->extradata_size);
  80     }
  81
  82     // for QDM2
  83     if (sh_audio->codecdata_len && sh_audio->codecdata && !lavc_context->extradata)
  84     {
  85         lavc_context->extradata = av_malloc(sh_audio->codecdata_len);
  86         lavc_context->extradata_size = sh_audio->codecdata_len;
  87         memcpy(lavc_context->extradata, (char *)sh_audio->codecdata,
  88                lavc_context->extradata_size);
  89     }
  90
  91     /* open it */
  92     if (avcodec_open(lavc_context, lavc_codec) < 0) {
  93         mp_tmsg(MSGT_DECAUDIO,MSGL_ERR, "Could not open codec.\n");
  94         return 0;
  95     }
  96    mp_msg(MSGT_DECAUDIO,MSGL_V,"INFO: libavcodec \"%s\" init OK!\n", lavc_codec->name);
  97
  98 //   printf("\nFOURCC: 0x%X\n",sh_audio->format);
  99    if(sh_audio->format==0x3343414D){
 100        // MACE 3:1
 101        sh_audio->ds->ss_div = 2*3; // 1 samples/packet
 102        sh_audio->ds->ss_mul = 2*sh_audio->wf->nChannels; // 1 byte*ch/packet
 103    } else
 104    if(sh_audio->format==0x3643414D){
 105        // MACE 6:1
 106        sh_audio->ds->ss_div = 2*6; // 1 samples/packet
 107        sh_audio->ds->ss_mul = 2*sh_audio->wf->nChannels; // 1 byte*ch/packet
 108    }
 109
 110    // Decode at least 1 byte:  (to get header filled)
 111    do {
 112        x=decode_audio(sh_audio,sh_audio->a_buffer,1,sh_audio->a_buffer_size);
 113    } while (x <= 0 && tries++ < 5);
 114    if(x>0) sh_audio->a_buffer_len=x;
 115
 116   sh_audio->channels=lavc_context->channels;
 117   sh_audio->samplerate=lavc_context->sample_rate;
 118   sh_audio->i_bps=lavc_context->bit_rate/8;
 119   switch (lavc_context->sample_fmt) {
 120       case SAMPLE_FMT_U8:  sh_audio->sample_format = AF_FORMAT_U8;       break;
 121       case SAMPLE_FMT_S16: sh_audio->sample_format = AF_FORMAT_S16_NE;   break;
 122       case SAMPLE_FMT_S32: sh_audio->sample_format = AF_FORMAT_S32_NE;   break;
 123       case SAMPLE_FMT_FLT: sh_audio->sample_format = AF_FORMAT_FLOAT_NE; break;
 124       default:
 125           mp_msg(MSGT_DECAUDIO, MSGL_FATAL, "Unsupported sample format\n");
 126           return 0;
 127   }
 128   if(sh_audio->wf){
 129       // If the decoder uses the wrong number of channels all is lost anyway.
 130       // sh_audio->channels=sh_audio->wf->nChannels;
 131       if (sh_audio->wf->nSamplesPerSec)
 132       sh_audio->samplerate=sh_audio->wf->nSamplesPerSec;
 133       if (sh_audio->wf->nAvgBytesPerSec)
 134       sh_audio->i_bps=sh_audio->wf->nAvgBytesPerSec;
 135   }
 136   sh_audio->samplesize=af_fmt2bits(sh_audio->sample_format)/ 8;
 137   return 1;
 138 }
 139
 140 static void uninit(sh_audio_t *sh)
 141 {
 142     AVCodecContext *lavc_context = sh->context;
 143
 144     if (avcodec_close(lavc_context) < 0)
 145         mp_tmsg(MSGT_DECVIDEO, MSGL_ERR, "Could not close codec.\n");
 146     av_freep(&lavc_context->extradata);
 147     av_freep(&lavc_context);
 148 }
 149
 150 static int control(sh_audio_t *sh,int cmd,void* arg, ...)
 151 {
 152     AVCodecContext *lavc_context = sh->context;
 153     switch(cmd){
 154     case ADCTRL_RESYNC_STREAM:
 155         avcodec_flush_buffers(lavc_context);
 156     return CONTROL_TRUE;
 157     }
 158     return CONTROL_UNKNOWN;
 159 }
 160
 161 static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
 162 {
 163     unsigned char *start=NULL;
 164     int y,len=-1;
 165     while(len<minlen){
 166         AVPacket pkt;
 167         int len2=maxlen;
 168         double pts;
 169         int x=ds_get_packet_pts(sh_audio->ds,&start, &pts);
 170         if(x<=0) {
 171             start = NULL;
 172             x = 0;
 173             ds_parse(sh_audio->ds, &start, &x, MP_NOPTS_VALUE, 0);
 174             if (x <= 0)
 175                 break; // error
 176         } else {
 177             int in_size = x;
 178             int consumed = ds_parse(sh_audio->ds, &start, &x, pts, 0);
 179             sh_audio->ds->buffer_pos -= in_size - consumed;
 180         }
 181         av_init_packet(&pkt);
 182         pkt.data = start;
 183         pkt.size = x;
 184         if (pts != MP_NOPTS_VALUE) {
 185             sh_audio->pts = pts;
 186             sh_audio->pts_bytes = 0;
 187         }
 188         y=avcodec_decode_audio3(sh_audio->context,(int16_t*)buf,&len2,&pkt);
 189 //printf("return:%d samples_out:%d bitstream_in:%d sample_sum:%d\n", y, len2, x, len); fflush(stdout);
 190         if(y<0){ mp_msg(MSGT_DECAUDIO,MSGL_V,"lavc_audio: error\n");break; }
 191         if(!sh_audio->needs_parsing && y<x)
 192             sh_audio->ds->buffer_pos+=y-x;  // put back data (HACK!)
 193         if(len2>0){
 194           if (((AVCodecContext *)sh_audio->context)->channels >= 5) {
 195             int samplesize = av_get_bits_per_sample_format(((AVCodecContext *)
 196                                     sh_audio->context)->sample_fmt) / 8;
 197             reorder_channel_nch(buf, AF_CHANNEL_LAYOUT_LAVC_DEFAULT,
 198                                 AF_CHANNEL_LAYOUT_MPLAYER_DEFAULT,
 199                                 ((AVCodecContext *)sh_audio->context)->channels,
 200                                 len2 / samplesize, samplesize);
 201           }
 202           //len=len2;break;
 203           if(len<0) len=len2; else len+=len2;
 204           buf+=len2;
 205           maxlen -= len2;
 206           sh_audio->pts_bytes += len2;
 207         }
 208         mp_dbg(MSGT_DECAUDIO,MSGL_DBG2,"Decoded %d -> %d  \n",y,len2);
 209     }
 210   return len;
 211 }