first FFmpeg / avcodoc commit (does NOT compile)
git-svn-id: https://openmw.svn.sourceforge.net/svnroot/openmw/trunk@24 ea6a568a-9f4f-0410-981a-c910a81bb256actorid
nkorslund
16 years ago
parent
1974b68dcd
commit
a99139cd2f
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extern (C):
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// A unique handle that represents an AV file
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typedef void* AVFile;
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// A unique handle representing an audio stream
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typedef void* AVAudio;
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// In case we ever decide to implement more codec backends, here's what
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// these functions need to do...
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// Open the named file, and return a unique handle representing it.
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// Returns NULL on error
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AVFile cpp_openAVFile(char *fname);
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// Close the file handle, invalidating all streams taken from it
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void cpp_closeAVFile(AVFile file);
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// Get a unique handle to an audio stream in the file. The given number
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// is for files that can contain multiple audio streams (generally you
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// would pass 0, for the first audio stream)
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void *cpp_getAVAudioStream(AVFile file, int streamnum);
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// Get audio info representing the current stream. Returns 0 for success
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// (not likely to fail)
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int cpp_getAVAudioInfo(AVAudio stream, int *rate, int *channels, int *bits);
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// Decode the next bit of data for the given audio stream. The function
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// must provide no less than the requested number of bytes, except for
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// end-of-stream conditions, and is responsible for buffering data. For
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// files with multiple streams, it must take care to preserve data for
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// any stream that has had a stream handle returned.
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// eg. if a file has one video stream and 2 audio streams and the app
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// gets a handle to the video stream and one audio stream, it must
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// not destroy video data for subsequent calls to cpp_getAVVideoData if
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// it has to read over it while decoding the audio stream. The other
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// audio stream's data, however, may be discarded.
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// Returns the number of bytes written to the buffer, which will be no
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// more than the provided length.
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int cpp_getAVAudioData(AVAudio stream, void *data, int length);
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@ -0,0 +1,209 @@
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/*
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OpenMW - The completely unofficial reimplementation of Morrowind
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Copyright (C) 2008 Nicolay Korslund
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Email: < korslund@gmail.com >
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WWW: http://openmw.snaptoad.com/
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This file (cpp_avcodec.cpp) is part of the OpenMW package.
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OpenMW is distributed as free software: you can redistribute it
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and/or modify it under the terms of the GNU General Public License
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version 3, as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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version 3 along with this program. If not, see
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http://www.gnu.org/licenses/ .
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*/
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#include <stdio.h>
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extern "C" { // the headers don't do this..
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#include <ffmpeg/avcodec.h>
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#include <ffmpeg/avformat.h>
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}
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#include <vector>
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using std::vector;
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struct MyFile {
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AVFormatContext *FmtCtx;
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struct MyStream {
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MyFile *parent;
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AVCodecContext *CodecCtx;
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int StreamNum;
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vector<uint8_t> Data;
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vector<char> DecodedData;
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};
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vector<MyStream> Streams;
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};
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// TODO:
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// extern "C" MyFile::MyStream *cpp_getAVVideoStream(MyFile *file, int streamnum);
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// extern "C" int cpp_getAVVideoInfo(MyFile::MyStream *stream, float *fps, int *width, int * height);
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// extern "C" int cpp_getAVVideoData(MyFile::MyStream *stream, char *data, int length);
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extern "C" MyFile *cpp_openAVFile(char *fname)
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{
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static bool done = false;
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if(!done) { av_register_all();
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av_log_set_level(AV_LOG_ERROR);}
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done = true;
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MyFile *file = new MyFile;
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if(av_open_input_file(&file->FmtCtx, fname, NULL, 0, NULL) == 0)
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{
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if(av_find_stream_info(file->FmtCtx) >= 0)
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return file;
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av_close_input_file(file->FmtCtx);
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}
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delete file;
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return NULL;
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}
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extern "C" void cpp_closeAVFile(MyFile *file)
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{
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if(!file) return;
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for(size_t i = 0;i < file->Streams.size();i++)
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{
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avcodec_close(file->Streams[i].CodecCtx);
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file->Streams[i].Data.clear();
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file->Streams[i].DecodedData.clear();
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}
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file->Streams.clear();
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av_close_input_file(file->FmtCtx);
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delete file;
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}
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extern "C" MyFile::MyStream *cpp_getAVAudioStream(MyFile *file, int streamnum)
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{
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if(!file) return NULL;
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for(unsigned int i = 0;i < file->FmtCtx->nb_streams;i++)
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{
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if(file->FmtCtx->streams[i]->codec->codec_type != CODEC_TYPE_AUDIO)
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continue;
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if(streamnum == 0)
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{
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MyFile::MyStream stream;
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stream.parent = file;
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stream.CodecCtx = file->FmtCtx->streams[i]->codec;
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stream.StreamNum = i;
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AVCodec *codec = avcodec_find_decoder(stream.CodecCtx->codec_id);
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if(!codec) return NULL;
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if(avcodec_open(stream.CodecCtx, codec) < 0)
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return NULL;
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file->Streams.push_back(stream);
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return &file->Streams[file->Streams.size()-1];
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}
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streamnum--;
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}
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return NULL;
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}
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extern "C" int cpp_getAVAudioInfo(MyFile::MyStream *stream,
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int *rate, int *channels, int *bits)
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{
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if(!stream) return 1;
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if(rate) *rate = stream->CodecCtx->sample_rate;
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if(channels) *channels = stream->CodecCtx->channels;
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if(bits) *bits = 16;
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return 0;
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}
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static int getNextPacket(MyFile *file)
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{
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AVPacket packet;
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while(av_read_frame(file->FmtCtx, &packet) >= 0)
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{
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for(vector<MyFile::MyStream>::iterator i = file->Streams.begin();
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i != file->Streams.end();i++)
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{
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if(i->StreamNum == packet.stream_index)
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{
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size_t idx = i->Data.size();
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i->Data.resize(idx + packet.size);
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memcpy(&i->Data[idx], packet.data, packet.size);
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av_free_packet(&packet);
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return 0;
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}
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}
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av_free_packet(&packet);
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}
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return 1;
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}
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extern "C" int cpp_getAVAudioData(MyFile::MyStream *stream, char *data, int length)
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{
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if(!stream) return 0;
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int dec = 0;
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while(dec < length)
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{
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if(stream->DecodedData.size() == 0)
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{
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while(stream->Data.size() == 0)
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{
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if(getNextPacket(stream->parent) != 0)
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break;
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}
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int insize = stream->Data.size();
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if(insize == 0)
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break;
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// Temporarilly add padding to the input data since some
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// codecs read in larger chunks and may accidently read
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// past the end of the allocated buffer
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stream->Data.resize(insize + FF_INPUT_BUFFER_PADDING_SIZE);
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stream->DecodedData.resize(AVCODEC_MAX_AUDIO_FRAME_SIZE);
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int16_t *ptr = (int16_t*)&stream->DecodedData[0];
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int size = stream->DecodedData.size();
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int len = avcodec_decode_audio2(stream->CodecCtx, ptr, &size,
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&stream->Data[0], insize);
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if(len < 0)
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{
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stream->Data.resize(insize);
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break;
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}
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int datarem = insize-len;
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if(datarem)
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memmove(&stream->Data[0], &stream->Data[len], datarem);
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stream->Data.resize(datarem);
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stream->DecodedData.resize(size);
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if(stream->DecodedData.size() == 0)
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break;
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}
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size_t rem = length-dec;
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if(rem > stream->DecodedData.size())
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rem = stream->DecodedData.size();
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memcpy(data, &stream->DecodedData[0], rem);
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data += rem;
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dec += rem;
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if(rem < stream->DecodedData.size())
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memmove(&stream->DecodedData[0], &stream->DecodedData[rem],
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stream->DecodedData.size() - rem);
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stream->DecodedData.resize(stream->DecodedData.size()-rem);
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}
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return dec;
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}
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