blender/intern/audaspace/ffmpeg/AUD_FFMPEGReader.cpp

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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* Copyright 2009-2011 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 General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Audaspace; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* ***** END GPL LICENSE BLOCK *****
*/
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/** \file audaspace/ffmpeg/AUD_FFMPEGReader.cpp
* \ingroup audffmpeg
*/
// needed for INT64_C
#ifndef __STDC_CONSTANT_MACROS
#define __STDC_CONSTANT_MACROS
#endif
#include "AUD_FFMPEGReader.h"
extern "C" {
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libavformat/avio.h>
#include "ffmpeg_compat.h"
}
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;
AVPacket tmp_pkt;
av_init_packet(&tmp_pkt);
// 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;
tmp_pkt.data = audio_pkg_data;
tmp_pkt.size = audio_pkg_size;
read_length = avcodec_decode_audio3(
m_codecCtx,
(int16_t*)(((data_t*)buffer.getBuffer()) + buf_pos),
&data_size, &tmp_pkt);
// read error, next packet!
if(read_length < 0)
break;
buf_pos += data_size;
// move packet parameters
audio_pkg_data += read_length;
audio_pkg_size -= read_length;
}
return buf_pos;
}
static const char* streaminfo_error = "AUD_FFMPEGReader: Stream info couldn't "
"be found.";
static const char* noaudio_error = "AUD_FFMPEGReader: File doesn't include an "
"audio stream.";
static const char* nodecoder_error = "AUD_FFMPEGReader: No decoder found for "
"the audio stream.";
static const char* codecopen_error = "AUD_FFMPEGReader: Codec couldn't be "
"opened.";
static const char* format_error = "AUD_FFMPEGReader: Unsupported sample "
"format.";
void AUD_FFMPEGReader::init()
{
m_position = 0;
m_pkgbuf_left = 0;
if(av_find_stream_info(m_formatCtx)<0)
AUD_THROW(AUD_ERROR_FFMPEG, streaminfo_error);
// 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 == AVMEDIA_TYPE_AUDIO)
&& (m_stream < 0))
{
m_stream=i;
break;
}
}
if(m_stream == -1)
AUD_THROW(AUD_ERROR_FFMPEG, noaudio_error);
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, nodecoder_error);
if(avcodec_open(m_codecCtx, aCodec)<0)
AUD_THROW(AUD_ERROR_FFMPEG, codecopen_error);
// XXX this prints file information to stdout:
//dump_format(m_formatCtx, 0, NULL, 0);
m_specs.channels = (AUD_Channels) m_codecCtx->channels;
switch(m_codecCtx->sample_fmt)
{
case SAMPLE_FMT_U8:
m_convert = AUD_convert_u8_float;
m_specs.format = AUD_FORMAT_U8;
break;
case SAMPLE_FMT_S16:
m_convert = AUD_convert_s16_float;
m_specs.format = AUD_FORMAT_S16;
break;
case SAMPLE_FMT_S32:
m_convert = AUD_convert_s32_float;
m_specs.format = AUD_FORMAT_S32;
break;
case SAMPLE_FMT_FLT:
m_convert = AUD_convert_copy<float>;
m_specs.format = AUD_FORMAT_FLOAT32;
break;
case SAMPLE_FMT_DBL:
m_convert = AUD_convert_double_float;
m_specs.format = AUD_FORMAT_FLOAT64;
break;
default:
AUD_THROW(AUD_ERROR_FFMPEG, format_error);
}
m_specs.rate = (AUD_SampleRate) m_codecCtx->sample_rate;
}
static const char* fileopen_error = "AUD_FFMPEGReader: File couldn't be "
"opened.";
AUD_FFMPEGReader::AUD_FFMPEGReader(std::string filename) :
m_pkgbuf(AVCODEC_MAX_AUDIO_FRAME_SIZE<<1),
m_formatCtx(NULL),
m_aviocontext(NULL),
m_membuf(NULL)
{
// open file
if(avformat_open_input(&m_formatCtx, filename.c_str(), NULL, NULL)!=0)
AUD_THROW(AUD_ERROR_FILE, fileopen_error);
try
{
init();
}
catch(AUD_Exception&)
{
av_close_input_file(m_formatCtx);
throw;
}
}
static const char* streamopen_error = "AUD_FFMPEGReader: Stream couldn't be "
"opened.";
AUD_FFMPEGReader::AUD_FFMPEGReader(AUD_Reference<AUD_Buffer> buffer) :
m_pkgbuf(AVCODEC_MAX_AUDIO_FRAME_SIZE<<1),
m_membuffer(buffer),
m_membufferpos(0)
{
m_membuf = reinterpret_cast<data_t*>(av_malloc(FF_MIN_BUFFER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE));
m_aviocontext = avio_alloc_context(m_membuf, FF_MIN_BUFFER_SIZE, 0, this,
read_packet, NULL, seek_packet);
if(!m_aviocontext)
{
av_free(m_aviocontext);
AUD_THROW(AUD_ERROR_FILE, fileopen_error);
}
m_formatCtx = avformat_alloc_context();
m_formatCtx->pb = m_aviocontext;
if(avformat_open_input(&m_formatCtx, "", NULL, NULL)!=0)
{
av_free(m_aviocontext);
AUD_THROW(AUD_ERROR_FILE, streamopen_error);
}
try
{
init();
}
catch(AUD_Exception&)
{
av_close_input_stream(m_formatCtx);
av_free(m_aviocontext);
throw;
}
}
AUD_FFMPEGReader::~AUD_FFMPEGReader()
{
avcodec_close(m_codecCtx);
if(m_aviocontext)
{
av_close_input_stream(m_formatCtx);
av_free(m_aviocontext);
}
else
av_close_input_file(m_formatCtx);
}
int AUD_FFMPEGReader::read_packet(void* opaque, uint8_t* buf, int buf_size)
{
AUD_FFMPEGReader* reader = reinterpret_cast<AUD_FFMPEGReader*>(opaque);
int size = AUD_MIN(buf_size, reader->m_membuffer->getSize() - reader->m_membufferpos);
if(size < 0)
return -1;
memcpy(buf, ((data_t*)reader->m_membuffer->getBuffer()) + reader->m_membufferpos, size);
reader->m_membufferpos += size;
return size;
}
int64_t AUD_FFMPEGReader::seek_packet(void* opaque, int64_t offset, int whence)
{
AUD_FFMPEGReader* reader = reinterpret_cast<AUD_FFMPEGReader*>(opaque);
switch(whence)
{
case SEEK_SET:
reader->m_membufferpos = 0;
break;
case SEEK_END:
reader->m_membufferpos = reader->m_membuffer->getSize();
break;
case AVSEEK_SIZE:
return reader->m_membuffer->getSize();
}
return (reader->m_membufferpos += offset);
}
bool AUD_FFMPEGReader::isSeekable() const
{
return true;
}
void AUD_FFMPEGReader::seek(int position)
{
if(position >= 0)
{
uint64_t st_time = m_formatCtx->start_time;
uint64_t seek_pos = ((uint64_t)position) * ((uint64_t)AV_TIME_BASE) / ((uint64_t)m_specs.rate);
if (seek_pos < 0) {
seek_pos = 0;
}
if (st_time != AV_NOPTS_VALUE) {
seek_pos += st_time;
}
double pts_time_base =
av_q2d(m_formatCtx->streams[m_stream]->time_base);
uint64_t pts_st_time =
((st_time != AV_NOPTS_VALUE) ? st_time : 0)
/ pts_time_base / (uint64_t) AV_TIME_BASE;
// a value < 0 tells us that seeking failed
if(av_seek_frame(m_formatCtx, -1, seek_pos,
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 -
pts_st_time) * pts_time_base * m_specs.rate;
if(m_position < position)
{
// read until we're at the right position
int length = AUD_DEFAULT_BUFFER_SIZE;
AUD_Buffer buffer(length * AUD_SAMPLE_SIZE(m_specs));
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bool eos;
for(int len = position - m_position;
length == AUD_DEFAULT_BUFFER_SIZE;
len -= AUD_DEFAULT_BUFFER_SIZE)
{
if(len < AUD_DEFAULT_BUFFER_SIZE)
length = len;
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read(length, eos, buffer.getBuffer());
}
}
}
}
av_free_packet(&packet);
}
}
else
{
fprintf(stderr, "seeking failed!\n");
// Seeking failed, do nothing.
}
}
}
int AUD_FFMPEGReader::getLength() const
{
// return approximated remaning size
return (int)((m_formatCtx->duration * m_codecCtx->sample_rate)
/ AV_TIME_BASE)-m_position;
}
int AUD_FFMPEGReader::getPosition() const
{
return m_position;
}
AUD_Specs AUD_FFMPEGReader::getSpecs() const
{
return m_specs.specs;
}
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void AUD_FFMPEGReader::read(int& length, bool& eos, sample_t* buffer)
{
// read packages and decode them
AVPacket packet;
int data_size = 0;
int pkgbuf_pos;
int left = length;
int sample_size = AUD_DEVICE_SAMPLE_SIZE(m_specs);
sample_t* buf = buffer;
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);
m_convert((data_t*) buf, (data_t*) m_pkgbuf.getBuffer(),
data_size / AUD_FORMAT_SIZE(m_specs.format));
buf += data_size / AUD_FORMAT_SIZE(m_specs.format);
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);
m_convert((data_t*) buf, (data_t*) m_pkgbuf.getBuffer(),
data_size / AUD_FORMAT_SIZE(m_specs.format));
buf += data_size / AUD_FORMAT_SIZE(m_specs.format);
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(),
((data_t*)m_pkgbuf.getBuffer())+data_size,
pkgbuf_pos-data_size);
}
if((eos = (left > 0)))
length -= left;
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m_position += length;
}