libaf/af_lavcac3enc.c

   1 /*
   2  * audio filter for runtime AC-3 encoding with libavcodec.
   3  *
   4  * Copyright (C) 2007 Ulion <ulion A gmail P com>
   5  *
   6  * This file is part of MPlayer.
   7  *
   8  * MPlayer is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * MPlayer is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <inttypes.h>
  27 #include <assert.h>
  28
  29 #include "libmpcodecs/vd_ffmpeg.h"
  30 #include "config.h"
  31 #include "af.h"
  32 #include "reorder_ch.h"
  33
  34 #include "libavcodec/avcodec.h"
  35 #include "ffmpeg_files/intreadwrite.h"
  36
  37 #define AC3_MAX_CHANNELS 6
  38 #define AC3_MAX_CODED_FRAME_SIZE 3840
  39 #define AC3_FRAME_SIZE (6  * 256)
  40 const uint16_t ac3_bitrate_tab[19] = {
  41     32, 40, 48, 56, 64, 80, 96, 112, 128,
  42     160, 192, 224, 256, 320, 384, 448, 512, 576, 640
  43 };
  44
  45 // Data for specific instances of this filter
  46 typedef struct af_ac3enc_s {
  47     struct AVCodec        *lavc_acodec;
  48     struct AVCodecContext *lavc_actx;
  49     int add_iec61937_header;
  50     int bit_rate;
  51     int pending_data_size;
  52     char *pending_data;
  53     int pending_len;
  54     int expect_len;
  55     int min_channel_num;
  56 } af_ac3enc_t;
  57
  58 // Initialization and runtime control
  59 static int control(struct af_instance_s *af, int cmd, void *arg)
  60 {
  61     af_ac3enc_t *s  = (af_ac3enc_t *)af->setup;
  62     af_data_t *data = (af_data_t *)arg;
  63     int i, bit_rate, test_output_res;
  64     static const int default_bit_rate[AC3_MAX_CHANNELS+1] = \
  65         {0, 96000, 192000, 256000, 384000, 448000, 448000};
  66
  67     switch (cmd){
  68     case AF_CONTROL_REINIT:
  69         if (AF_FORMAT_IS_AC3(data->format) || data->nch < s->min_channel_num)
  70             return AF_DETACH;
  71
  72         af->data->format = AF_FORMAT_S16_NE;
  73         if (data->rate == 48000 || data->rate == 44100 || data->rate == 32000)
  74             af->data->rate = data->rate;
  75         else
  76             af->data->rate = 48000;
  77         if (data->nch > AC3_MAX_CHANNELS)
  78             af->data->nch = AC3_MAX_CHANNELS;
  79         else
  80             af->data->nch = data->nch;
  81         af->data->bps = 2;
  82         test_output_res = af_test_output(af, data);
  83
  84         s->pending_len = 0;
  85         s->expect_len = AC3_FRAME_SIZE * data->nch * af->data->bps;
  86         assert(s->expect_len <= s->pending_data_size);
  87         if (s->add_iec61937_header)
  88             af->mul = (double)AC3_FRAME_SIZE * 2 * 2 / s->expect_len;
  89         else
  90             af->mul = (double)AC3_MAX_CODED_FRAME_SIZE / s->expect_len;
  91
  92         mp_msg(MSGT_AFILTER, MSGL_DBG2, "af_lavcac3enc reinit: %d, %d, %f, %d.\n",
  93                data->nch, data->rate, af->mul, s->expect_len);
  94
  95         bit_rate = s->bit_rate ? s->bit_rate : default_bit_rate[af->data->nch];
  96
  97         if (s->lavc_actx->channels != af->data->nch ||
  98                 s->lavc_actx->sample_rate != af->data->rate ||
  99                 s->lavc_actx->bit_rate != bit_rate) {
 100
 101             if (s->lavc_actx->codec)
 102                 avcodec_close(s->lavc_actx);
 103
 104             // Put sample parameters
 105             s->lavc_actx->channels = af->data->nch;
 106             s->lavc_actx->sample_rate = af->data->rate;
 107             s->lavc_actx->bit_rate = bit_rate;
 108
 109             if(avcodec_open(s->lavc_actx, s->lavc_acodec) < 0) {
 110                 mp_tmsg(MSGT_AFILTER, MSGL_ERR, "Couldn't open codec %s, br=%d.\n", "ac3", bit_rate);
 111                 return AF_ERROR;
 112             }
 113         }
 114         if (s->lavc_actx->frame_size != AC3_FRAME_SIZE) {
 115             mp_msg(MSGT_AFILTER, MSGL_ERR, "lavcac3enc: unexpected ac3 "
 116                    "encoder frame size %d\n", s->lavc_actx->frame_size);
 117             return AF_ERROR;
 118         }
 119         af->data->format = AF_FORMAT_AC3_BE;
 120         af->data->nch = 2;
 121         return test_output_res;
 122     case AF_CONTROL_COMMAND_LINE:
 123         mp_msg(MSGT_AFILTER, MSGL_DBG2, "af_lavcac3enc cmdline: %s.\n", (char*)arg);
 124         s->bit_rate = 0;
 125         s->min_channel_num = 0;
 126         s->add_iec61937_header = 0;
 127         sscanf((char*)arg,"%d:%d:%d", &s->add_iec61937_header, &s->bit_rate,
 128                &s->min_channel_num);
 129         if (s->bit_rate < 1000)
 130             s->bit_rate *= 1000;
 131         if (s->bit_rate) {
 132             for (i = 0; i < 19; ++i)
 133                 if (ac3_bitrate_tab[i] * 1000 == s->bit_rate)
 134                     break;
 135             if (i >= 19) {
 136                 mp_msg(MSGT_AFILTER, MSGL_WARN, "af_lavcac3enc unable set unsupported "
 137                        "bitrate %d, use default bitrate (check manpage to see "
 138                        "supported bitrates).\n", s->bit_rate);
 139                 s->bit_rate = 0;
 140             }
 141         }
 142         if (s->min_channel_num == 0)
 143             s->min_channel_num = 5;
 144         mp_msg(MSGT_AFILTER, MSGL_V, "af_lavcac3enc config spdif:%d, bitrate:%d, "
 145                "minchnum:%d.\n", s->add_iec61937_header, s->bit_rate,
 146                s->min_channel_num);
 147         return AF_OK;
 148     }
 149     return AF_UNKNOWN;
 150 }
 151
 152 // Deallocate memory
 153 static void uninit(struct af_instance_s* af)
 154 {
 155     if (af->data)
 156         free(af->data->audio);
 157     free(af->data);
 158     if (af->setup) {
 159         af_ac3enc_t *s = af->setup;
 160         af->setup = NULL;
 161         if(s->lavc_actx) {
 162             if (s->lavc_actx->codec)
 163                 avcodec_close(s->lavc_actx);
 164             free(s->lavc_actx);
 165         }
 166         free(s->pending_data);
 167         free(s);
 168     }
 169 }
 170
 171 // Filter data through filter
 172 static af_data_t* play(struct af_instance_s* af, af_data_t* data)
 173 {
 174     af_ac3enc_t *s = af->setup;
 175     af_data_t *c = data;    // Current working data
 176     af_data_t *l;
 177     int len, left, outsize = 0, destsize;
 178     char *buf, *src, *dest;
 179     int max_output_len;
 180     int frame_num = (data->len + s->pending_len) / s->expect_len;
 181
 182     if (s->add_iec61937_header)
 183         max_output_len = AC3_FRAME_SIZE * 2 * 2 * frame_num;
 184     else
 185         max_output_len = AC3_MAX_CODED_FRAME_SIZE * frame_num;
 186
 187     if (af->data->len < max_output_len) {
 188         mp_msg(MSGT_AFILTER, MSGL_V, "[libaf] Reallocating memory in module %s, "
 189                "old len = %i, new len = %i\n", af->info->name, af->data->len,
 190                 max_output_len);
 191         free(af->data->audio);
 192         af->data->audio = malloc(max_output_len);
 193         if (!af->data->audio) {
 194             mp_msg(MSGT_AFILTER, MSGL_FATAL, "[libaf] Could not allocate memory \n");
 195             return NULL;
 196         }
 197         af->data->len = max_output_len;
 198     }
 199
 200     l = af->data;           // Local data
 201     buf = (char *)l->audio;
 202     src = (char *)c->audio;
 203     left = c->len;
 204
 205
 206     while (left > 0) {
 207         if (left + s->pending_len < s->expect_len) {
 208             memcpy(s->pending_data + s->pending_len, src, left);
 209             src += left;
 210             s->pending_len += left;
 211             left = 0;
 212             break;
 213         }
 214
 215         dest = s->add_iec61937_header ? buf + 8 : buf;
 216         destsize = (char *)l->audio + l->len - buf;
 217
 218         if (s->pending_len) {
 219             int needs = s->expect_len - s->pending_len;
 220             if (needs > 0) {
 221                 memcpy(s->pending_data + s->pending_len, src, needs);
 222                 src += needs;
 223                 left -= needs;
 224             }
 225
 226             if (c->nch >= 5)
 227                 reorder_channel_nch(s->pending_data,
 228                                     AF_CHANNEL_LAYOUT_MPLAYER_DEFAULT,
 229                                     AF_CHANNEL_LAYOUT_LAVC_DEFAULT,
 230                                     c->nch,
 231                                     s->expect_len / 2, 2);
 232
 233             len = avcodec_encode_audio(s->lavc_actx, dest, destsize,
 234                                        (void *)s->pending_data);
 235             s->pending_len = 0;
 236         }
 237         else {
 238             if (c->nch >= 5)
 239                 reorder_channel_nch(src,
 240                                     AF_CHANNEL_LAYOUT_MPLAYER_DEFAULT,
 241                                     AF_CHANNEL_LAYOUT_LAVC_DEFAULT,
 242                                     c->nch,
 243                                     s->expect_len / 2, 2);
 244             len = avcodec_encode_audio(s->lavc_actx,dest,destsize,(void *)src);
 245             src += s->expect_len;
 246             left -= s->expect_len;
 247         }
 248         mp_msg(MSGT_AFILTER, MSGL_DBG2, "avcodec_encode_audio got %d, pending %d.\n",
 249                len, s->pending_len);
 250
 251         if (s->add_iec61937_header) {
 252             int bsmod = dest[5] & 0x7;
 253
 254             AV_WB16(buf,     0xF872);   // iec 61937 syncword 1
 255             AV_WB16(buf + 2, 0x4E1F);   // iec 61937 syncword 2
 256             buf[4] = bsmod;             // bsmod
 257             buf[5] = 0x01;              // data-type ac3
 258             AV_WB16(buf + 6, len << 3); // number of bits in payload
 259
 260             memset(buf + 8 + len, 0, AC3_FRAME_SIZE * 2 * 2 - 8 - len);
 261             len = AC3_FRAME_SIZE * 2 * 2;
 262         }
 263
 264         outsize += len;
 265         buf += len;
 266     }
 267     c->audio = l->audio;
 268     c->nch   = 2;
 269     c->bps   = 2;
 270     c->len   = outsize;
 271     mp_msg(MSGT_AFILTER, MSGL_DBG2, "play return size %d, pending %d\n",
 272            outsize, s->pending_len);
 273     return c;
 274 }
 275
 276 static int af_open(af_instance_t* af){
 277
 278     af_ac3enc_t *s = calloc(1,sizeof(af_ac3enc_t));
 279     s->pending_data_size = 2 * AF_NCH * AC3_FRAME_SIZE;
 280     s->pending_data = malloc(s->pending_data_size);
 281
 282     af->control=control;
 283     af->uninit=uninit;
 284     af->play=play;
 285     af->mul=1;
 286     af->data=calloc(1,sizeof(af_data_t));
 287     af->setup=s;
 288
 289     init_avcodec();
 290
 291     s->lavc_acodec = avcodec_find_encoder_by_name("ac3");
 292     if (!s->lavc_acodec) {
 293         mp_tmsg(MSGT_AFILTER, MSGL_ERR, "Audio LAVC, couldn't find encoder for codec %s.\n", "ac3");
 294         return AF_ERROR;
 295     }
 296
 297     s->lavc_actx = avcodec_alloc_context();
 298     if (!s->lavc_actx) {
 299         mp_tmsg(MSGT_AFILTER, MSGL_ERR, "Audio LAVC, couldn't allocate context!\n");
 300         return AF_ERROR;
 301     }
 302
 303     return AF_OK;
 304 }
 305
 306 af_info_t af_info_lavcac3enc = {
 307     "runtime encode to ac3 using libavcodec",
 308     "lavcac3enc",
 309     "Ulion",
 310     "",
 311     AF_FLAGS_REENTRANT,
 312     af_open
 313 };