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