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