intern/audaspace/ffmpeg/AUD_FFMPEGReader.cpp

   1 /*
   2  * $Id$
   3  *
   4  * ***** BEGIN LGPL LICENSE BLOCK *****
   5  *
   6  * Copyright 2009 Jörg Hermann Müller
   7  *
   8  * This file is part of AudaSpace.
   9  *
  10  * AudaSpace is free software: you can redistribute it and/or modify
  11  * it under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation, either version 3 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * AudaSpace is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with AudaSpace.  If not, see <http://www.gnu.org/licenses/>.
  22  *
  23  * ***** END LGPL LICENSE BLOCK *****
  24  */
  25
  26 // needed for INT64_C
  27 #ifndef __STDC_CONSTANT_MACROS
  28 #define __STDC_CONSTANT_MACROS
  29 #endif
  30
  31 #include "AUD_FFMPEGReader.h"
  32
  33 extern "C" {
  34 #include <libavcodec/avcodec.h>
  35 #include <libavformat/avformat.h>
  36 }
  37
  38 int AUD_FFMPEGReader::decode(AVPacket* packet, AUD_Buffer& buffer)
  39 {
  40         // save packet parameters
  41         uint8_t *audio_pkg_data = packet->data;
  42         int audio_pkg_size = packet->size;
  43
  44         int buf_size = buffer.getSize();
  45         int buf_pos = 0;
  46
  47         int read_length, data_size;
  48
  49         // as long as there is still data in the package
  50         while(audio_pkg_size > 0)
  51         {
  52                 // resize buffer if needed
  53                 if(buf_size - buf_pos < AVCODEC_MAX_AUDIO_FRAME_SIZE)
  54                 {
  55                         buffer.resize(buf_size + AVCODEC_MAX_AUDIO_FRAME_SIZE, true);
  56                         buf_size += AVCODEC_MAX_AUDIO_FRAME_SIZE;
  57                 }
  58
  59                 // read samples from the packet
  60                 data_size = buf_size - buf_pos;
  61                 /*read_length = avcodec_decode_audio3(m_codecCtx,
  62                         (int16_t*)(((data_t*)buffer.getBuffer())+buf_pos),
  63                         &data_size,
  64                         packet);*/
  65                 read_length = avcodec_decode_audio2(m_codecCtx,
  66                                                 (int16_t*)(((data_t*)buffer.getBuffer()) + buf_pos),
  67                                                 &data_size,
  68                                                 audio_pkg_data,
  69                                                 audio_pkg_size);
  70
  71                 // read error, next packet!
  72                 if(read_length < 0)
  73                         break;
  74
  75                 buf_pos += data_size;
  76
  77                 // move packet parameters
  78                 audio_pkg_data += read_length;
  79                 audio_pkg_size -= read_length;
  80         }
  81
  82         return buf_pos;
  83 }
  84
  85 static const char* streaminfo_error = "AUD_FFMPEGReader: Stream info couldn't "
  86                                                                           "be found.";
  87 static const char* noaudio_error = "AUD_FFMPEGReader: File doesn't include an "
  88                                                                    "audio stream.";
  89 static const char* nodecoder_error = "AUD_FFMPEGReader: No decoder found for "
  90                                                                          "the audio stream.";
  91 static const char* codecopen_error = "AUD_FFMPEGReader: Codec couldn't be "
  92                                                                          "opened.";
  93 static const char* format_error = "AUD_FFMPEGReader: Unsupported sample "
  94                                                                   "format.";
  95
  96 void AUD_FFMPEGReader::init()
  97 {
  98         m_position = 0;
  99         m_pkgbuf_left = 0;
 100
 101         if(av_find_stream_info(m_formatCtx)<0)
 102                 AUD_THROW(AUD_ERROR_FFMPEG, streaminfo_error);
 103
 104         // find audio stream and codec
 105         m_stream = -1;
 106
 107         for(unsigned int i = 0; i < m_formatCtx->nb_streams; i++)
 108         {
 109                 if((m_formatCtx->streams[i]->codec->codec_type == CODEC_TYPE_AUDIO)
 110                         && (m_stream < 0))
 111                 {
 112                         m_stream=i;
 113                         break;
 114                 }
 115         }
 116
 117         if(m_stream == -1)
 118                 AUD_THROW(AUD_ERROR_FFMPEG, noaudio_error);
 119
 120         m_codecCtx = m_formatCtx->streams[m_stream]->codec;
 121
 122         // get a decoder and open it
 123         AVCodec *aCodec = avcodec_find_decoder(m_codecCtx->codec_id);
 124         if(!aCodec)
 125                 AUD_THROW(AUD_ERROR_FFMPEG, nodecoder_error);
 126
 127         if(avcodec_open(m_codecCtx, aCodec)<0)
 128                 AUD_THROW(AUD_ERROR_FFMPEG, codecopen_error);
 129
 130         // XXX this prints file information to stdout:
 131         //dump_format(m_formatCtx, 0, NULL, 0);
 132
 133         m_specs.channels = (AUD_Channels) m_codecCtx->channels;
 134
 135         switch(m_codecCtx->sample_fmt)
 136         {
 137         case SAMPLE_FMT_U8:
 138                 m_convert = AUD_convert_u8_float;
 139                 m_specs.format = AUD_FORMAT_U8;
 140                 break;
 141         case SAMPLE_FMT_S16:
 142                 m_convert = AUD_convert_s16_float;
 143                 m_specs.format = AUD_FORMAT_S16;
 144                 break;
 145         case SAMPLE_FMT_S32:
 146                 m_convert = AUD_convert_s32_float;
 147                 m_specs.format = AUD_FORMAT_S32;
 148                 break;
 149         case SAMPLE_FMT_FLT:
 150                 m_convert = AUD_convert_copy<float>;
 151                 m_specs.format = AUD_FORMAT_FLOAT32;
 152                 break;
 153         case SAMPLE_FMT_DBL:
 154                 m_convert = AUD_convert_double_float;
 155                 m_specs.format = AUD_FORMAT_FLOAT64;
 156                 break;
 157         default:
 158                 AUD_THROW(AUD_ERROR_FFMPEG, format_error);
 159         }
 160
 161         m_specs.rate = (AUD_SampleRate) m_codecCtx->sample_rate;
 162 }
 163
 164 static const char* fileopen_error = "AUD_FFMPEGReader: File couldn't be "
 165                                                                         "opened.";
 166
 167 AUD_FFMPEGReader::AUD_FFMPEGReader(std::string filename) :
 168         m_pkgbuf(AVCODEC_MAX_AUDIO_FRAME_SIZE<<1),
 169         m_byteiocontext(NULL)
 170 {
 171         // open file
 172         if(av_open_input_file(&m_formatCtx, filename.c_str(), NULL, 0, NULL)!=0)
 173                 AUD_THROW(AUD_ERROR_FILE, fileopen_error);
 174
 175         try
 176         {
 177                 init();
 178         }
 179         catch(AUD_Exception&)
 180         {
 181                 av_close_input_file(m_formatCtx);
 182                 throw;
 183         }
 184 }
 185
 186 static const char* streamopen_error = "AUD_FFMPEGReader: Stream couldn't be "
 187                                                                           "opened.";
 188
 189 AUD_FFMPEGReader::AUD_FFMPEGReader(AUD_Reference<AUD_Buffer> buffer) :
 190                 m_pkgbuf(AVCODEC_MAX_AUDIO_FRAME_SIZE<<1),
 191                 m_membuffer(buffer)
 192 {
 193         m_byteiocontext = (ByteIOContext*)av_mallocz(sizeof(ByteIOContext));
 194
 195         if(init_put_byte(m_byteiocontext, (data_t*)buffer.get()->getBuffer(),
 196                                          buffer.get()->getSize(), 0, NULL, NULL, NULL, NULL) != 0)
 197         {
 198                 av_free(m_byteiocontext);
 199                 AUD_THROW(AUD_ERROR_FILE, fileopen_error);
 200         }
 201
 202         AVProbeData probe_data;
 203         probe_data.filename = "";
 204         probe_data.buf = (data_t*)buffer.get()->getBuffer();
 205         probe_data.buf_size = buffer.get()->getSize();
 206         AVInputFormat* fmt = av_probe_input_format(&probe_data, 1);
 207
 208         // open stream
 209         if(av_open_input_stream(&m_formatCtx, m_byteiocontext, "", fmt, NULL)!=0)
 210         {
 211                 av_free(m_byteiocontext);
 212                 AUD_THROW(AUD_ERROR_FILE, streamopen_error);
 213         }
 214
 215         try
 216         {
 217                 init();
 218         }
 219         catch(AUD_Exception&)
 220         {
 221                 av_close_input_stream(m_formatCtx);
 222                 av_free(m_byteiocontext);
 223                 throw;
 224         }
 225 }
 226
 227 AUD_FFMPEGReader::~AUD_FFMPEGReader()
 228 {
 229         avcodec_close(m_codecCtx);
 230
 231         if(m_byteiocontext)
 232         {
 233                 av_close_input_stream(m_formatCtx);
 234                 av_free(m_byteiocontext);
 235         }
 236         else
 237                 av_close_input_file(m_formatCtx);
 238 }
 239
 240 bool AUD_FFMPEGReader::isSeekable() const
 241 {
 242         return true;
 243 }
 244
 245 void AUD_FFMPEGReader::seek(int position)
 246 {
 247         if(position >= 0)
 248         {
 249                 uint64_t st_time = m_formatCtx->start_time;
 250                 uint64_t seek_pos = position * AV_TIME_BASE / m_specs.rate;
 251
 252                 if (seek_pos < 0) {
 253                         seek_pos = 0;
 254                 }
 255
 256                 if (st_time != AV_NOPTS_VALUE) {
 257                         seek_pos += st_time;
 258                 }
 259
 260                 double pts_time_base =
 261                         av_q2d(m_formatCtx->streams[m_stream]->time_base);
 262                 uint64_t pts_st_time =
 263                         ((st_time != AV_NOPTS_VALUE) ? st_time : 0)
 264                         / pts_time_base / (uint64_t) AV_TIME_BASE;
 265
 266                 // a value < 0 tells us that seeking failed
 267                 if(av_seek_frame(m_formatCtx, -1, seek_pos,
 268                                  AVSEEK_FLAG_BACKWARD | AVSEEK_FLAG_ANY) >= 0)
 269                 {
 270                         avcodec_flush_buffers(m_codecCtx);
 271                         m_position = position;
 272
 273                         AVPacket packet;
 274                         bool search = true;
 275
 276                         while(search && av_read_frame(m_formatCtx, &packet) >= 0)
 277                         {
 278                                 // is it a frame from the audio stream?
 279                                 if(packet.stream_index == m_stream)
 280                                 {
 281                                         // decode the package
 282                                         m_pkgbuf_left = decode(&packet, m_pkgbuf);
 283                                         search = false;
 284
 285                                         // check position
 286                                         if(packet.pts != AV_NOPTS_VALUE)
 287                                         {
 288                                                 // calculate real position, and read to frame!
 289                                                 m_position = (packet.pts -
 290                                                         pts_st_time) * pts_time_base * m_specs.rate;
 291
 292                                                 if(m_position < position)
 293                                                 {
 294                                                         // read until we're at the right position
 295                                                         int length = AUD_DEFAULT_BUFFER_SIZE;
 296                                                         sample_t* buffer;
 297                                                         for(int len = position - m_position;
 298                                                                 length == AUD_DEFAULT_BUFFER_SIZE;
 299                                                                 len -= AUD_DEFAULT_BUFFER_SIZE)
 300                                                         {
 301                                                                 if(len < AUD_DEFAULT_BUFFER_SIZE)
 302                                                                         length = len;
 303                                                                 read(length, buffer);
 304                                                         }
 305                                                 }
 306                                         }
 307                                 }
 308                                 av_free_packet(&packet);
 309                         }
 310                 }
 311                 else
 312                 {
 313                         fprintf(stderr, "seeking failed!\n");
 314                         // Seeking failed, do nothing.
 315                 }
 316         }
 317 }
 318
 319 int AUD_FFMPEGReader::getLength() const
 320 {
 321         // return approximated remaning size
 322         return (int)((m_formatCtx->duration * m_codecCtx->sample_rate)
 323                                  / AV_TIME_BASE)-m_position;
 324 }
 325
 326 int AUD_FFMPEGReader::getPosition() const
 327 {
 328         return m_position;
 329 }
 330
 331 AUD_Specs AUD_FFMPEGReader::getSpecs() const
 332 {
 333         return m_specs.specs;
 334 }
 335
 336 void AUD_FFMPEGReader::read(int & length, sample_t* & buffer)
 337 {
 338         // read packages and decode them
 339         AVPacket packet;
 340         int data_size = 0;
 341         int pkgbuf_pos;
 342         int left = length;
 343         int sample_size = AUD_DEVICE_SAMPLE_SIZE(m_specs);
 344
 345         // resize output buffer if necessary
 346         if(m_buffer.getSize() < length * AUD_SAMPLE_SIZE(m_specs))
 347                 m_buffer.resize(length * AUD_SAMPLE_SIZE(m_specs));
 348
 349         buffer = m_buffer.getBuffer();
 350         pkgbuf_pos = m_pkgbuf_left;
 351         m_pkgbuf_left = 0;
 352
 353         // there may still be data in the buffer from the last call
 354         if(pkgbuf_pos > 0)
 355         {
 356                 data_size = AUD_MIN(pkgbuf_pos, left * sample_size);
 357                 m_convert((data_t*) buffer, (data_t*) m_pkgbuf.getBuffer(),
 358                                   data_size / AUD_FORMAT_SIZE(m_specs.format));
 359                 buffer += data_size / AUD_FORMAT_SIZE(m_specs.format);
 360                 left -= data_size/sample_size;
 361         }
 362
 363         // for each frame read as long as there isn't enough data already
 364         while((left > 0) && (av_read_frame(m_formatCtx, &packet) >= 0))
 365         {
 366                 // is it a frame from the audio stream?
 367                 if(packet.stream_index == m_stream)
 368                 {
 369                         // decode the package
 370                         pkgbuf_pos = decode(&packet, m_pkgbuf);
 371
 372                         // copy to output buffer
 373                         data_size = AUD_MIN(pkgbuf_pos, left * sample_size);
 374                         m_convert((data_t*) buffer, (data_t*) m_pkgbuf.getBuffer(),
 375                                           data_size / AUD_FORMAT_SIZE(m_specs.format));
 376                         buffer += data_size / AUD_FORMAT_SIZE(m_specs.format);
 377                         left -= data_size/sample_size;
 378                 }
 379                 av_free_packet(&packet);
 380         }
 381         // read more data than necessary?
 382         if(pkgbuf_pos > data_size)
 383         {
 384                 m_pkgbuf_left = pkgbuf_pos-data_size;
 385                 memmove(m_pkgbuf.getBuffer(),
 386                                 ((data_t*)m_pkgbuf.getBuffer())+data_size,
 387                                 pkgbuf_pos-data_size);
 388         }
 389
 390         buffer = m_buffer.getBuffer();
 391
 392         if(left > 0)
 393                 length -= left;
 394         m_position += length;
 395 }