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AUD_FFMPEGReader.cpp

/*
 * $Id$
 *
 * ***** BEGIN LGPL LICENSE BLOCK *****
 *
 * Copyright 2009 Jörg Hermann Müller
 *
 * This file is part of AudaSpace.
 *
 * AudaSpace is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * AudaSpace is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with AudaSpace.  If not, see <http://www.gnu.org/licenses/>.
 *
 * ***** END LGPL LICENSE BLOCK *****
 */

// needed for INT64_C
#define __STDC_CONSTANT_MACROS

#include "AUD_FFMPEGReader.h"
#include "AUD_Buffer.h"

extern "C" {
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
}

// This function transforms a FFMPEG SampleFormat to our own sample format
static inline AUD_SampleFormat FFMPEG_TO_AUD(SampleFormat fmt)
{
      switch(fmt)
      {
      case SAMPLE_FMT_U8:
            return AUD_FORMAT_U8;
      case SAMPLE_FMT_S16:
            return AUD_FORMAT_S16;
      case SAMPLE_FMT_S32:
            return AUD_FORMAT_S32;
      case SAMPLE_FMT_FLT:
            return AUD_FORMAT_FLOAT32;
      case SAMPLE_FMT_DBL:
            return AUD_FORMAT_FLOAT64;
      default:
            return AUD_FORMAT_INVALID;
      }
}

00057 int AUD_FFMPEGReader::decode(AVPacket* packet, AUD_Buffer* buffer)
{
      // save packet parameters
      uint8_t *audio_pkg_data = packet->data;
      int audio_pkg_size = packet->size;

      int buf_size = buffer->getSize();
      int buf_pos = 0;

      int read_length, data_size;

      // as long as there is still data in the package
      while(audio_pkg_size > 0)
      {
            // resize buffer if needed
            if(buf_size - buf_pos < AVCODEC_MAX_AUDIO_FRAME_SIZE)
            {
                  buffer->resize(buf_size + AVCODEC_MAX_AUDIO_FRAME_SIZE, true);
                  buf_size += AVCODEC_MAX_AUDIO_FRAME_SIZE;
            }

            // read samples from the packet
            data_size = buf_size - buf_pos;
            /*read_length = avcodec_decode_audio3(m_codecCtx,
                  (int16_t*)(buffer->getBuffer()+buf_pos),
                  &data_size,
                  packet);*/
            read_length = avcodec_decode_audio2(m_codecCtx,
                  (int16_t*)(buffer->getBuffer()+buf_pos),
                  &data_size,
                  audio_pkg_data,
                  audio_pkg_size);

            buf_pos += data_size;

            // read error, next packet!
            if(read_length < 0)
                  break;

            // move packet parameters
            audio_pkg_data += read_length;
            audio_pkg_size -= read_length;
      }

      return buf_pos;
}

00104 AUD_FFMPEGReader::AUD_FFMPEGReader(const char* filename)
{
      m_position = 0;
      m_pkgbuf_left = 0;
      m_byteiocontext = NULL;

      // open file
      if(av_open_input_file(&m_formatCtx, filename, NULL, 0, NULL)!=0)
            AUD_THROW(AUD_ERROR_FILE);

      try
      {
            if(av_find_stream_info(m_formatCtx)<0)
                  AUD_THROW(AUD_ERROR_FFMPEG);

            // find audio stream and codec
            m_stream = -1;

            for(unsigned int i = 0; i < m_formatCtx->nb_streams; i++)
                  if((m_formatCtx->streams[i]->codec->codec_type == CODEC_TYPE_AUDIO)
                        && (m_stream < 0))
                  {
                        m_stream=i;
                        break;
                  }
            if(m_stream == -1)
                  AUD_THROW(AUD_ERROR_FFMPEG);

            m_codecCtx = m_formatCtx->streams[m_stream]->codec;

            // get a decoder and open it
            AVCodec *aCodec = avcodec_find_decoder(m_codecCtx->codec_id);
            if(!aCodec)
                  AUD_THROW(AUD_ERROR_FFMPEG);

            if(avcodec_open(m_codecCtx, aCodec)<0)
                  AUD_THROW(AUD_ERROR_FFMPEG);

            // XXX this prints file information to stdout:
            //dump_format(m_formatCtx, 0, filename, 0);

            m_specs.channels = (AUD_Channels) m_codecCtx->channels;
            m_specs.format = FFMPEG_TO_AUD(m_codecCtx->sample_fmt);
            m_specs.rate = (AUD_SampleRate) m_codecCtx->sample_rate;
      }
      catch(AUD_Exception)
      {
            av_close_input_file(m_formatCtx);
            throw;
      }

      // last but not least if there hasn't been any error, create the buffers
      m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
      m_pkgbuf = new AUD_Buffer(AVCODEC_MAX_AUDIO_FRAME_SIZE<<1);
      AUD_NEW("buffer")
}

00161 AUD_FFMPEGReader::AUD_FFMPEGReader(AUD_Reference<AUD_Buffer> buffer)
{
      m_position = 0;
      m_pkgbuf_left = 0;
      m_byteiocontext = (ByteIOContext*)av_mallocz(sizeof(ByteIOContext));
      AUD_NEW("byteiocontext")
      m_membuffer = buffer;

      if(init_put_byte(m_byteiocontext, buffer.get()->getBuffer(), buffer.get()->getSize(), 0,
                               NULL, NULL, NULL, NULL) != 0)
            AUD_THROW(AUD_ERROR_FILE);

      AVProbeData probe_data;
      probe_data.filename = "";
      probe_data.buf = buffer.get()->getBuffer();
      probe_data.buf_size = buffer.get()->getSize();
      AVInputFormat* fmt = av_probe_input_format(&probe_data, 1);

      // open stream
      if(av_open_input_stream(&m_formatCtx, m_byteiocontext, "", fmt, NULL)!=0)
            AUD_THROW(AUD_ERROR_FILE);

      try
      {
            if(av_find_stream_info(m_formatCtx)<0)
                  AUD_THROW(AUD_ERROR_FFMPEG);

            // find audio stream and codec
            m_stream = -1;

            for(unsigned int i = 0; i < m_formatCtx->nb_streams; i++)
                  if((m_formatCtx->streams[i]->codec->codec_type == CODEC_TYPE_AUDIO)
                        && (m_stream < 0))
                  {
                        m_stream=i;
                        break;
                  }
            if(m_stream == -1)
                  AUD_THROW(AUD_ERROR_FFMPEG);

            m_codecCtx = m_formatCtx->streams[m_stream]->codec;

            // get a decoder and open it
            AVCodec *aCodec = avcodec_find_decoder(m_codecCtx->codec_id);
            if(!aCodec)
                  AUD_THROW(AUD_ERROR_FFMPEG);

            if(avcodec_open(m_codecCtx, aCodec)<0)
                  AUD_THROW(AUD_ERROR_FFMPEG);

            // XXX this prints stream information to stdout:
            //dump_format(m_formatCtx, 0, NULL, 0);

            m_specs.channels = (AUD_Channels) m_codecCtx->channels;
            m_specs.format = FFMPEG_TO_AUD(m_codecCtx->sample_fmt);
            m_specs.rate = (AUD_SampleRate) m_codecCtx->sample_rate;
      }
      catch(AUD_Exception)
      {
            av_close_input_stream(m_formatCtx);
            av_free(m_byteiocontext); AUD_DELETE("byteiocontext")
            throw;
      }

      // last but not least if there hasn't been any error, create the buffers
      m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
      m_pkgbuf = new AUD_Buffer(AVCODEC_MAX_AUDIO_FRAME_SIZE<<1);
      AUD_NEW("buffer")
}

00231 AUD_FFMPEGReader::~AUD_FFMPEGReader()
{
      avcodec_close(m_codecCtx);

      if(m_byteiocontext)
      {
            av_close_input_stream(m_formatCtx);
            av_free(m_byteiocontext); AUD_DELETE("byteiocontext")
      }
      else
            av_close_input_file(m_formatCtx);

      delete m_buffer; AUD_DELETE("buffer")
      delete m_pkgbuf; AUD_DELETE("buffer")
}

00247 bool AUD_FFMPEGReader::isSeekable()
{
      return true;
}

00252 void AUD_FFMPEGReader::seek(int position)
{
      if(position >= 0)
      {
            // a value < 0 tells us that seeking failed
            if(av_seek_frame(m_formatCtx,
                                     -1,
                                     (uint64_t)(((uint64_t)position *
                                                       (uint64_t)AV_TIME_BASE) /
                                                      (uint64_t)m_specs.rate),
                                     AVSEEK_FLAG_BACKWARD | AVSEEK_FLAG_ANY) >= 0)
            {
                  avcodec_flush_buffers(m_codecCtx);
                  m_position = position;

                  AVPacket packet;
                  bool search = true;

                  while(search && av_read_frame(m_formatCtx, &packet) >= 0)
                  {
                        // is it a frame from the audio stream?
                        if(packet.stream_index == m_stream)
                        {
                              // decode the package
                              m_pkgbuf_left = decode(&packet, m_pkgbuf);
                              search = false;

                              // check position
                              if(packet.pts != AV_NOPTS_VALUE)
                              {
                                    // calculate real position, and read to frame!
                                    m_position = packet.pts *
                                          av_q2d(m_formatCtx->streams[m_stream]->time_base) *
                                          m_specs.rate;

                                    if(m_position < position)
                                    {
                                          sample_t* buf;
                                          int length = position - m_position;
                                          read(length, buf);
                                    }
                              }
                        }
                        av_free_packet(&packet);
                  }
            }
            else
            {
                  // Seeking failed, do nothing.
            }
      }
}

00305 int AUD_FFMPEGReader::getLength()
{
      // return approximated remaning size
      return (int)((m_formatCtx->duration * m_codecCtx->sample_rate)
                         / AV_TIME_BASE)-m_position;
}

00312 int AUD_FFMPEGReader::getPosition()
{
      return m_position;
}

00317 AUD_Specs AUD_FFMPEGReader::getSpecs()
{
      return m_specs;
}

00322 AUD_ReaderType AUD_FFMPEGReader::getType()
{
      return AUD_TYPE_STREAM;
}

00327 bool AUD_FFMPEGReader::notify(AUD_Message &message)
{
      return false;
}

00332 void AUD_FFMPEGReader::read(int & length, sample_t* & buffer)
{
      // read packages and decode them
      AVPacket packet;
      int data_size = 0;
      int pkgbuf_pos;
      int left = length;
      int sample_size = AUD_SAMPLE_SIZE(m_specs);

      // resize output buffer if necessary
      if(m_buffer->getSize() < length*sample_size)
            m_buffer->resize(length*sample_size);

      buffer = m_buffer->getBuffer();
      pkgbuf_pos = m_pkgbuf_left;
      m_pkgbuf_left = 0;

      // there may still be data in the buffer from the last call
      if(pkgbuf_pos > 0)
      {
            data_size = AUD_MIN(pkgbuf_pos, left * sample_size);
            memcpy(buffer, m_pkgbuf->getBuffer(), data_size);
            buffer += data_size;
            left -= data_size/sample_size;
      }

      // for each frame read as long as there isn't enough data already
      while((left > 0) && (av_read_frame(m_formatCtx, &packet) >= 0))
      {
            // is it a frame from the audio stream?
            if(packet.stream_index == m_stream)
            {
                  // decode the package
                  pkgbuf_pos = decode(&packet, m_pkgbuf);

                  // copy to output buffer
                  data_size = AUD_MIN(pkgbuf_pos, left * sample_size);
                  memcpy(buffer, m_pkgbuf->getBuffer(), data_size);
                  buffer += data_size;
                  left -= data_size/sample_size;
            }
            av_free_packet(&packet);
      }
      // read more data than necessary?
      if(pkgbuf_pos > data_size)
      {
            m_pkgbuf_left = pkgbuf_pos-data_size;
            memmove(m_pkgbuf->getBuffer(), m_pkgbuf->getBuffer()+data_size,
                        pkgbuf_pos-data_size);
      }

      buffer = m_buffer->getBuffer();

      if(left > 0)
            length -= left;
      m_position += length;
}

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