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 #include "ffmpeg_files/intreadwrite.h"
  20
  21 static AVCodec        *lavc_acodec;
  22 static AVCodecContext *lavc_actx;
  23 extern char *lavc_param_acodec;
  24 extern int  lavc_param_abitrate;
  25 extern int  lavc_param_atag;
  26 extern int  lavc_param_audio_global_header;
  27 extern int  avcodec_initialized;
  28 static int compressed_frame_size = 0;
  29 #include "libmpdemux/mp_taglists.h"
  30
  31 static int bind_lavc(audio_encoder_t *encoder, muxer_stream_t *mux_a)
  32 {
  33         mux_a->wf = malloc(sizeof(WAVEFORMATEX)+lavc_actx->extradata_size+256);
  34         mux_a->wf->wFormatTag = lavc_param_atag;
  35         mux_a->wf->nChannels = lavc_actx->channels;
  36         mux_a->wf->nSamplesPerSec = lavc_actx->sample_rate;
  37         mux_a->wf->nAvgBytesPerSec = (lavc_actx->bit_rate / 8);
  38         mux_a->avg_rate= lavc_actx->bit_rate;
  39         mux_a->h.dwRate = mux_a->wf->nAvgBytesPerSec;
  40         if(lavc_actx->block_align)
  41                 mux_a->h.dwSampleSize = mux_a->h.dwScale = lavc_actx->block_align;
  42         else
  43         {
  44                 mux_a->h.dwScale = (mux_a->wf->nAvgBytesPerSec * lavc_actx->frame_size)/ mux_a->wf->nSamplesPerSec; /* for cbr */
  45
  46                 if ((mux_a->wf->nAvgBytesPerSec *
  47                         lavc_actx->frame_size) % mux_a->wf->nSamplesPerSec)
  48                 {
  49                         mux_a->h.dwScale = lavc_actx->frame_size;
  50                         mux_a->h.dwRate = lavc_actx->sample_rate;
  51                         mux_a->h.dwSampleSize = 0; // Blocksize not constant
  52                 }
  53                 else
  54                         mux_a->h.dwSampleSize = 0;
  55         }
  56         if(mux_a->h.dwSampleSize)
  57                 mux_a->wf->nBlockAlign = mux_a->h.dwSampleSize;
  58         else
  59                 mux_a->wf->nBlockAlign = 1;
  60         mux_a->h.dwSuggestedBufferSize = (encoder->params.audio_preload*mux_a->wf->nAvgBytesPerSec)/1000;
  61         mux_a->h.dwSuggestedBufferSize -= mux_a->h.dwSuggestedBufferSize % mux_a->wf->nBlockAlign;
  62
  63         switch(lavc_param_atag)
  64         {
  65                 case 0x11: /* imaadpcm */
  66                         mux_a->wf->wBitsPerSample = 4;
  67                         mux_a->wf->cbSize = 2;
  68                         AV_WL16(mux_a->wf+1, lavc_actx->frame_size);
  69                         break;
  70                 case 0x55: /* mp3 */
  71                         mux_a->wf->cbSize = 12;
  72                         mux_a->wf->wBitsPerSample = 0; /* does not apply */
  73                         ((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->wID = 1;
  74                         ((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->fdwFlags = 2;
  75                         ((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->nBlockSize = mux_a->wf->nBlockAlign;
  76                         ((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->nFramesPerBlock = 1;
  77                         ((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->nCodecDelay = 0;
  78                         break;
  79                 default:
  80                         mux_a->wf->wBitsPerSample = 0; /* Unknown */
  81                         if (lavc_actx->extradata && (lavc_actx->extradata_size > 0))
  82                         {
  83                                 memcpy(mux_a->wf+1, lavc_actx->extradata, lavc_actx->extradata_size);
  84                                 mux_a->wf->cbSize = lavc_actx->extradata_size;
  85                         }
  86                         else
  87                                 mux_a->wf->cbSize = 0;
  88                         break;
  89         }
  90
  91         // Fix allocation
  92         mux_a->wf = realloc(mux_a->wf, sizeof(WAVEFORMATEX)+mux_a->wf->cbSize);
  93
  94         encoder->input_format = AF_FORMAT_S16_NE;
  95         encoder->min_buffer_size = mux_a->h.dwSuggestedBufferSize;
  96         encoder->max_buffer_size = mux_a->h.dwSuggestedBufferSize*2;
  97
  98         return 1;
  99 }
 100
 101 static int encode_lavc(audio_encoder_t *encoder, uint8_t *dest, void *src, int size, int max_size)
 102 {
 103         int n;
 104         if ((encoder->params.channels == 6 || encoder->params.channels == 5) &&
 105                         (!strcmp(lavc_acodec->name,"ac3") ||
 106                         !strcmp(lavc_acodec->name,"libfaac"))) {
 107                 int isac3 = !strcmp(lavc_acodec->name,"ac3");
 108                 reorder_channel_nch(src, AF_CHANNEL_LAYOUT_MPLAYER_DEFAULT,
 109                                     isac3 ? AF_CHANNEL_LAYOUT_LAVC_DEFAULT
 110                                           : AF_CHANNEL_LAYOUT_AAC_DEFAULT,
 111                                     encoder->params.channels,
 112                                     size / 2, 2);
 113         }
 114         n = avcodec_encode_audio(lavc_actx, dest, size, src);
 115         compressed_frame_size = n;
 116         return n;
 117 }
 118
 119
 120 static int close_lavc(audio_encoder_t *encoder)
 121 {
 122         compressed_frame_size = 0;
 123         return 1;
 124 }
 125
 126 static int get_frame_size(audio_encoder_t *encoder)
 127 {
 128         int sz = compressed_frame_size;
 129         compressed_frame_size = 0;
 130         return sz;
 131 }
 132
 133 int mpae_init_lavc(audio_encoder_t *encoder)
 134 {
 135         encoder->params.samples_per_frame = encoder->params.sample_rate;
 136         encoder->params.bitrate = encoder->params.sample_rate * encoder->params.channels * 2 * 8;
 137
 138         if(!lavc_param_acodec)
 139         {
 140                 mp_tmsg(MSGT_MENCODER, MSGL_FATAL, "Audio LAVC, Missing codec name!\n");
 141                 return 0;
 142         }
 143
 144         if(!avcodec_initialized){
 145                 avcodec_init();
 146                 avcodec_register_all();
 147                 avcodec_initialized=1;
 148         }
 149
 150         lavc_acodec = avcodec_find_encoder_by_name(lavc_param_acodec);
 151         if (!lavc_acodec)
 152         {
 153                 mp_tmsg(MSGT_MENCODER, MSGL_FATAL, "Audio LAVC, couldn't find encoder for codec %s.\n", lavc_param_acodec);
 154                 return 0;
 155         }
 156         if(lavc_param_atag == 0)
 157         {
 158                 lavc_param_atag = mp_av_codec_get_tag(mp_wav_taglists, lavc_acodec->id);
 159                 if(!lavc_param_atag)
 160                 {
 161                         mp_msg(MSGT_MENCODER, MSGL_FATAL, "Couldn't find wav tag for specified codec, exit\n");
 162                         return 0;
 163                 }
 164         }
 165
 166         lavc_actx = avcodec_alloc_context();
 167         if(lavc_actx == NULL)
 168         {
 169                 mp_tmsg(MSGT_MENCODER, MSGL_FATAL, "Audio LAVC, couldn't allocate context!\n");
 170                 return 0;
 171         }
 172
 173         lavc_actx->codec_type = CODEC_TYPE_AUDIO;
 174         lavc_actx->codec_id = lavc_acodec->id;
 175         // put sample parameters
 176         lavc_actx->channels = encoder->params.channels;
 177         lavc_actx->sample_rate = encoder->params.sample_rate;
 178         lavc_actx->time_base.num = 1;
 179         lavc_actx->time_base.den = encoder->params.sample_rate;
 180         if(lavc_param_abitrate<1000)
 181                 lavc_actx->bit_rate = encoder->params.bitrate = lavc_param_abitrate * 1000;
 182         else
 183                 lavc_actx->bit_rate = encoder->params.bitrate = lavc_param_abitrate;
 184
 185
 186         /*
 187         * Special case for adpcm_ima_wav.
 188         * The bitrate is only dependent on samplerate.
 189         * We have to known frame_size and block_align in advance,
 190         * so I just copied the code from libavcodec/adpcm.c
 191         *
 192         * However, ms adpcm_ima_wav uses a block_align of 2048,
 193         * lavc defaults to 1024
 194         */
 195         if(lavc_param_atag == 0x11) {
 196                 int blkalign = 2048;
 197                 int framesize = (blkalign - 4 * lavc_actx->channels) * 8 / (4 * lavc_actx->channels) + 1;
 198                 lavc_actx->bit_rate = lavc_actx->sample_rate*8*blkalign/framesize;
 199         }
 200         if((lavc_param_audio_global_header&1)
 201         /*|| (video_global_header==0 && (oc->oformat->flags & AVFMT_GLOBALHEADER))*/){
 202                 lavc_actx->flags |= CODEC_FLAG_GLOBAL_HEADER;
 203         }
 204         if(lavc_param_audio_global_header&2){
 205                 lavc_actx->flags2 |= CODEC_FLAG2_LOCAL_HEADER;
 206         }
 207
 208         if(avcodec_open(lavc_actx, lavc_acodec) < 0)
 209         {
 210                 mp_tmsg(MSGT_MENCODER, MSGL_FATAL, "Couldn't open codec %s, br=%d.\n", lavc_param_acodec, lavc_param_abitrate);
 211                 return 0;
 212         }
 213
 214         if(lavc_param_atag == 0x11) {
 215                 lavc_actx->block_align = 2048;
 216                 lavc_actx->frame_size = (lavc_actx->block_align - 4 * lavc_actx->channels) * 8 / (4 * lavc_actx->channels) + 1;
 217         }
 218
 219         encoder->decode_buffer_size = lavc_actx->frame_size * 2 * encoder->params.channels;
 220         while (encoder->decode_buffer_size < 1024) encoder->decode_buffer_size *= 2;
 221         encoder->bind = bind_lavc;
 222         encoder->get_frame_size = get_frame_size;
 223         encoder->encode = encode_lavc;
 224         encoder->close = close_lavc;
 225
 226         return 1;
 227 }