libmpcodecs/ae_lavc.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <inttypes.h>
   4 #include <unistd.h>
   5 #include <string.h>
   6 #include <sys/types.h>
   7 #include "m_option.h"
   8 #include "mp_msg.h"
   9 #include "libmpdemux/aviheader.h"
  10 #include "libmpdemux/ms_hdr.h"
  11 #include "stream/stream.h"
  12 #include "libmpdemux/muxer.h"
  13 #include "ae_lavc.h"
  14 #include "help_mp.h"
  15 #include "config.h"
  16 #include "libaf/af_format.h"
  17 #include "libaf/reorder_ch.h"
  18 #ifdef USE_LIBAVCODEC_SO
  19 #include <ffmpeg/avcodec.h>
  20 #else
  21 #include "libavcodec/avcodec.h"
  22 #endif
  23
  24 static AVCodec        *lavc_acodec;
  25 static AVCodecContext *lavc_actx;
  26 extern char *lavc_param_acodec;
  27 extern int  lavc_param_abitrate;
  28 extern int  lavc_param_atag;
  29 extern int  lavc_param_audio_global_header;
  30 extern int  avcodec_inited;
  31 static int compressed_frame_size = 0;
  32 #ifdef USE_LIBAVFORMAT
  33 #ifdef USE_LIBAVFORMAT_SO
  34 #include <ffmpeg/avformat.h>
  35 #else
  36 #include "libavformat/avformat.h"
  37 #endif
  38 extern const struct AVCodecTag *mp_wav_taglists[];
  39 #endif
  40
  41 static int bind_lavc(audio_encoder_t *encoder, muxer_stream_t *mux_a)
  42 {
  43         mux_a->wf = malloc(sizeof(WAVEFORMATEX)+lavc_actx->extradata_size+256);
  44         mux_a->wf->wFormatTag = lavc_param_atag;
  45         mux_a->wf->nChannels = lavc_actx->channels;
  46         mux_a->wf->nSamplesPerSec = lavc_actx->sample_rate;
  47         mux_a->wf->nAvgBytesPerSec = (lavc_actx->bit_rate / 8);
  48         mux_a->avg_rate= lavc_actx->bit_rate;
  49         mux_a->h.dwRate = mux_a->wf->nAvgBytesPerSec;
  50         if(lavc_actx->block_align)
  51                 mux_a->h.dwSampleSize = mux_a->h.dwScale = lavc_actx->block_align;
  52         else
  53         {
  54                 mux_a->h.dwScale = (mux_a->wf->nAvgBytesPerSec * lavc_actx->frame_size)/ mux_a->wf->nSamplesPerSec; /* for cbr */
  55
  56                 if ((mux_a->wf->nAvgBytesPerSec *
  57                         lavc_actx->frame_size) % mux_a->wf->nSamplesPerSec)
  58                 {
  59                         mux_a->h.dwScale = lavc_actx->frame_size;
  60                         mux_a->h.dwRate = lavc_actx->sample_rate;
  61                         mux_a->h.dwSampleSize = 0; // Blocksize not constant
  62                 }
  63                 else
  64                         mux_a->h.dwSampleSize = 0;
  65         }
  66         if(mux_a->h.dwSampleSize)
  67                 mux_a->wf->nBlockAlign = mux_a->h.dwSampleSize;
  68         else
  69                 mux_a->wf->nBlockAlign = 1;
  70         mux_a->h.dwSuggestedBufferSize = (encoder->params.audio_preload*mux_a->wf->nAvgBytesPerSec)/1000;
  71         mux_a->h.dwSuggestedBufferSize -= mux_a->h.dwSuggestedBufferSize % mux_a->wf->nBlockAlign;
  72
  73         switch(lavc_param_atag)
  74         {
  75                 case 0x11: /* imaadpcm */
  76                         mux_a->wf->wBitsPerSample = 4;
  77                         mux_a->wf->cbSize = 2;
  78                         ((uint16_t*)mux_a->wf)[sizeof(WAVEFORMATEX)] =
  79                                 ((lavc_actx->block_align - 4 * lavc_actx->channels) / (4 * lavc_actx->channels)) * 8 + 1;
  80                         break;
  81                 case 0x55: /* mp3 */
  82                         mux_a->wf->cbSize = 12;
  83                         mux_a->wf->wBitsPerSample = 0; /* does not apply */
  84                         ((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->wID = 1;
  85                         ((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->fdwFlags = 2;
  86                         ((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->nBlockSize = mux_a->wf->nBlockAlign;
  87                         ((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->nFramesPerBlock = 1;
  88                         ((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->nCodecDelay = 0;
  89                         break;
  90                 default:
  91                         mux_a->wf->wBitsPerSample = 0; /* Unknown */
  92                         if (lavc_actx->extradata && (lavc_actx->extradata_size > 0))
  93                         {
  94                                 memcpy(mux_a->wf+1, lavc_actx->extradata, lavc_actx->extradata_size);
  95                                 mux_a->wf->cbSize = lavc_actx->extradata_size;
  96                         }
  97                         else
  98                                 mux_a->wf->cbSize = 0;
  99                         break;
 100         }
 101
 102         // Fix allocation
 103         mux_a->wf = realloc(mux_a->wf, sizeof(WAVEFORMATEX)+mux_a->wf->cbSize);
 104
 105         encoder->input_format = AF_FORMAT_S16_NE;
 106         encoder->min_buffer_size = mux_a->h.dwSuggestedBufferSize;
 107         encoder->max_buffer_size = mux_a->h.dwSuggestedBufferSize*2;
 108
 109         return 1;
 110 }
 111
 112 static int encode_lavc(audio_encoder_t *encoder, uint8_t *dest, void *src, int size, int max_size)
 113 {
 114         int n;
 115         if ((encoder->params.channels == 6 || encoder->params.channels == 5) &&
 116                         (!strcmp(lavc_acodec->name,"ac3") ||
 117                         !strcmp(lavc_acodec->name,"libfaac"))) {
 118                 int isac3 = !strcmp(lavc_acodec->name,"ac3");
 119                 reorder_channel_nch(src, AF_CHANNEL_LAYOUT_MPLAYER_DEFAULT,
 120                                     isac3 ? AF_CHANNEL_LAYOUT_LAVC_AC3_DEFAULT
 121                                           : AF_CHANNEL_LAYOUT_AAC_DEFAULT,
 122                                     encoder->params.channels,
 123                                     size / 2, 2);
 124         }
 125         n = avcodec_encode_audio(lavc_actx, dest, size, src);
 126         compressed_frame_size = n;
 127         return n;
 128 }
 129
 130
 131 static int close_lavc(audio_encoder_t *encoder)
 132 {
 133         compressed_frame_size = 0;
 134         return 1;
 135 }
 136
 137 static int get_frame_size(audio_encoder_t *encoder)
 138 {
 139         int sz = compressed_frame_size;
 140         compressed_frame_size = 0;
 141         return sz;
 142 }
 143
 144 #ifndef USE_LIBAVFORMAT
 145 static uint32_t lavc_find_atag(char *codec)
 146 {
 147         if(codec == NULL)
 148                 return 0;
 149
 150         if(! strcasecmp(codec, "mp2"))
 151                 return 0x50;
 152
 153         if(! strcasecmp(codec, "mp3"))
 154                 return 0x55;
 155
 156         if(! strcasecmp(codec, "ac3"))
 157                 return 0x2000;
 158
 159         if(! strcasecmp(codec, "adpcm_ima_wav"))
 160                 return 0x11;
 161
 162         if(! strncasecmp(codec, "bonk", 4))
 163                 return 0x2048;
 164
 165         return 0;
 166 }
 167 #endif
 168
 169
 170 int mpae_init_lavc(audio_encoder_t *encoder)
 171 {
 172         encoder->params.samples_per_frame = encoder->params.sample_rate;
 173         encoder->params.bitrate = encoder->params.sample_rate * encoder->params.channels * 2 * 8;
 174
 175         if(!lavc_param_acodec)
 176         {
 177                 mp_msg(MSGT_MENCODER, MSGL_FATAL, MSGTR_NoLavcAudioCodecName);
 178                 return 0;
 179         }
 180
 181         if(!avcodec_inited){
 182                 avcodec_init();
 183                 avcodec_register_all();
 184                 avcodec_inited=1;
 185         }
 186
 187         lavc_acodec = avcodec_find_encoder_by_name(lavc_param_acodec);
 188         if (!lavc_acodec)
 189         {
 190                 mp_msg(MSGT_MENCODER, MSGL_FATAL, MSGTR_LavcAudioCodecNotFound, lavc_param_acodec);
 191                 return 0;
 192         }
 193         if(lavc_param_atag == 0)
 194         {
 195 #ifdef USE_LIBAVFORMAT
 196                 lavc_param_atag = av_codec_get_tag(mp_wav_taglists, lavc_acodec->id);
 197 #else
 198                 lavc_param_atag = lavc_find_atag(lavc_param_acodec);
 199 #endif
 200                 if(!lavc_param_atag)
 201                 {
 202                         mp_msg(MSGT_MENCODER, MSGL_FATAL, "Couldn't find wav tag for specified codec, exit\n");
 203                         return 0;
 204                 }
 205         }
 206
 207         lavc_actx = avcodec_alloc_context();
 208         if(lavc_actx == NULL)
 209         {
 210                 mp_msg(MSGT_MENCODER, MSGL_FATAL, MSGTR_CouldntAllocateLavcContext);
 211                 return 0;
 212         }
 213
 214         // put sample parameters
 215         lavc_actx->channels = encoder->params.channels;
 216         lavc_actx->sample_rate = encoder->params.sample_rate;
 217         if(lavc_param_abitrate<1000)
 218                 lavc_actx->bit_rate = encoder->params.bitrate = lavc_param_abitrate * 1000;
 219         else
 220                 lavc_actx->bit_rate = encoder->params.bitrate = lavc_param_abitrate;
 221
 222
 223         /*
 224         * Special case for adpcm_ima_wav.
 225         * The bitrate is only dependent on samplerate.
 226         * We have to known frame_size and block_align in advance,
 227         * so I just copied the code from libavcodec/adpcm.c
 228         *
 229         * However, ms adpcm_ima_wav uses a block_align of 2048,
 230         * lavc defaults to 1024
 231         */
 232         if(lavc_param_atag == 0x11) {
 233                 int blkalign = 2048;
 234                 int framesize = (blkalign - 4 * lavc_actx->channels) * 8 / (4 * lavc_actx->channels) + 1;
 235                 lavc_actx->bit_rate = lavc_actx->sample_rate*8*blkalign/framesize;
 236         }
 237         if((lavc_param_audio_global_header&1)
 238         /*|| (video_global_header==0 && (oc->oformat->flags & AVFMT_GLOBALHEADER))*/){
 239                 lavc_actx->flags |= CODEC_FLAG_GLOBAL_HEADER;
 240         }
 241         if(lavc_param_audio_global_header&2){
 242                 lavc_actx->flags2 |= CODEC_FLAG2_LOCAL_HEADER;
 243         }
 244
 245         if(avcodec_open(lavc_actx, lavc_acodec) < 0)
 246         {
 247                 mp_msg(MSGT_MENCODER, MSGL_FATAL, MSGTR_CouldntOpenCodec, lavc_param_acodec, lavc_param_abitrate);
 248                 return 0;
 249         }
 250
 251         if(lavc_param_atag == 0x11) {
 252                 lavc_actx->block_align = 2048;
 253                 lavc_actx->frame_size = (lavc_actx->block_align - 4 * lavc_actx->channels) * 8 / (4 * lavc_actx->channels) + 1;
 254         }
 255
 256         encoder->decode_buffer_size = lavc_actx->frame_size * 2 * encoder->params.channels;
 257         encoder->bind = bind_lavc;
 258         encoder->get_frame_size = get_frame_size;
 259         encoder->encode = encode_lavc;
 260         encoder->close = close_lavc;
 261
 262         return 1;
 263 }
 264