mirror of
https://github.com/love2d/megasource.git
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Add OpenAL-Soft 1.15.1.
This commit is contained in:
rude
@@ -0,0 +1,638 @@
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/*
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* FFmpeg Decoder Helpers
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*
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* Copyright (c) 2011 by Chris Robinson <chris.kcat@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/* This file contains routines for helping to decode audio using libavformat
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* and libavcodec (ffmpeg). There's very little OpenAL-specific code here. */
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <signal.h>
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#include <assert.h>
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#include "AL/al.h"
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#include "AL/alc.h"
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#include "AL/alext.h"
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#include "alhelpers.h"
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#include "alffmpeg.h"
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static size_t NextPowerOf2(size_t value)
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{
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size_t powerOf2 = 1;
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if(value)
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{
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value--;
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while(value)
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{
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value >>= 1;
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powerOf2 <<= 1;
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}
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}
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return powerOf2;
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}
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struct MemData {
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char *buffer;
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size_t length;
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size_t pos;
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};
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static int MemData_read(void *opaque, uint8_t *buf, int buf_size)
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{
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struct MemData *membuf = (struct MemData*)opaque;
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int rem = membuf->length - membuf->pos;
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if(rem > buf_size)
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rem = buf_size;
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memcpy(buf, &membuf->buffer[membuf->pos], rem);
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membuf->pos += rem;
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return rem;
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}
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static int MemData_write(void *opaque, uint8_t *buf, int buf_size)
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{
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struct MemData *membuf = (struct MemData*)opaque;
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int rem = membuf->length - membuf->pos;
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if(rem > buf_size)
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rem = buf_size;
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memcpy(&membuf->buffer[membuf->pos], buf, rem);
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membuf->pos += rem;
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return rem;
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}
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static int64_t MemData_seek(void *opaque, int64_t offset, int whence)
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{
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struct MemData *membuf = (struct MemData*)opaque;
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whence &= ~AVSEEK_FORCE;
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switch(whence)
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{
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case SEEK_SET:
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if(offset < 0 || (uint64_t)offset > membuf->length)
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return -1;
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membuf->pos = offset;
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break;
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case SEEK_CUR:
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if((offset >= 0 && (uint64_t)offset > membuf->length-membuf->pos) ||
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(offset < 0 && (uint64_t)(-offset) > membuf->pos))
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return -1;
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membuf->pos += offset;
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break;
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case SEEK_END:
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if(offset > 0 || (uint64_t)(-offset) > membuf->length)
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return -1;
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membuf->pos = membuf->length + offset;
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break;
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case AVSEEK_SIZE:
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return membuf->length;
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default:
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return -1;
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}
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return membuf->pos;
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}
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struct PacketList {
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AVPacket pkt;
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struct PacketList *next;
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};
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struct MyStream {
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AVCodecContext *CodecCtx;
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int StreamIdx;
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struct PacketList *Packets;
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AVFrame *Frame;
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const uint8_t *FrameData;
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size_t FrameDataSize;
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FilePtr parent;
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};
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struct MyFile {
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AVFormatContext *FmtCtx;
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StreamPtr *Streams;
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size_t StreamsSize;
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struct MemData membuf;
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};
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static int done_init = 0;
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FilePtr openAVFile(const char *fname)
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{
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FilePtr file;
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/* We need to make sure ffmpeg is initialized. Optionally silence warning
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* output from the lib */
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if(!done_init) {av_register_all();
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av_log_set_level(AV_LOG_ERROR);
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done_init = 1;}
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file = (FilePtr)calloc(1, sizeof(*file));
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if(file && avformat_open_input(&file->FmtCtx, fname, NULL, NULL) == 0)
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{
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/* After opening, we must search for the stream information because not
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* all formats will have it in stream headers */
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if(avformat_find_stream_info(file->FmtCtx, NULL) >= 0)
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return file;
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avformat_close_input(&file->FmtCtx);
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}
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free(file);
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return NULL;
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}
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FilePtr openAVData(const char *name, char *buffer, size_t buffer_len)
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{
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FilePtr file;
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if(!done_init) {av_register_all();
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av_log_set_level(AV_LOG_ERROR);
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done_init = 1;}
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if(!name)
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name = "";
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file = (FilePtr)calloc(1, sizeof(*file));
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if(file && (file->FmtCtx=avformat_alloc_context()) != NULL)
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{
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file->membuf.buffer = buffer;
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file->membuf.length = buffer_len;
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file->membuf.pos = 0;
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file->FmtCtx->pb = avio_alloc_context(NULL, 0, 0, &file->membuf,
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MemData_read, MemData_write,
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MemData_seek);
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if(file->FmtCtx->pb && avformat_open_input(&file->FmtCtx, name, NULL, NULL) == 0)
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{
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if(avformat_find_stream_info(file->FmtCtx, NULL) >= 0)
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return file;
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avformat_close_input(&file->FmtCtx);
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}
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if(file->FmtCtx)
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avformat_free_context(file->FmtCtx);
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file->FmtCtx = NULL;
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}
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free(file);
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return NULL;
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}
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FilePtr openAVCustom(const char *name, void *user_data,
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int (*read_packet)(void *user_data, uint8_t *buf, int buf_size),
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int (*write_packet)(void *user_data, uint8_t *buf, int buf_size),
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int64_t (*seek)(void *user_data, int64_t offset, int whence))
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{
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FilePtr file;
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if(!done_init) {av_register_all();
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av_log_set_level(AV_LOG_ERROR);
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done_init = 1;}
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if(!name)
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name = "";
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file = (FilePtr)calloc(1, sizeof(*file));
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if(file && (file->FmtCtx=avformat_alloc_context()) != NULL)
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{
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file->FmtCtx->pb = avio_alloc_context(NULL, 0, 0, user_data,
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read_packet, write_packet, seek);
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if(file->FmtCtx->pb && avformat_open_input(&file->FmtCtx, name, NULL, NULL) == 0)
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{
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if(avformat_find_stream_info(file->FmtCtx, NULL) >= 0)
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return file;
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avformat_close_input(&file->FmtCtx);
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}
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if(file->FmtCtx)
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avformat_free_context(file->FmtCtx);
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file->FmtCtx = NULL;
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}
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free(file);
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return NULL;
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}
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void clearAVAudioData(StreamPtr stream)
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{
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while(stream->Packets)
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{
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struct PacketList *self;
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self = stream->Packets;
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stream->Packets = self->next;
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av_free_packet(&self->pkt);
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av_free(self);
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}
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}
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void closeAVFile(FilePtr file)
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{
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size_t i;
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if(!file) return;
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for(i = 0;i < file->StreamsSize;i++)
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{
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StreamPtr stream = file->Streams[i];
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while(stream->Packets)
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{
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struct PacketList *self;
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self = stream->Packets;
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stream->Packets = self->next;
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av_free_packet(&self->pkt);
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av_free(self);
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}
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avcodec_close(stream->CodecCtx);
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av_free(stream->Frame);
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free(stream);
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}
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free(file->Streams);
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avformat_close_input(&file->FmtCtx);
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free(file);
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}
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int getAVFileInfo(FilePtr file, int *numaudiostreams)
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{
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unsigned int i;
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int audiocount = 0;
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if(!file) return 1;
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for(i = 0;i < file->FmtCtx->nb_streams;i++)
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{
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if(file->FmtCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
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audiocount++;
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}
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*numaudiostreams = audiocount;
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return 0;
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}
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StreamPtr getAVAudioStream(FilePtr file, int streamnum)
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{
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unsigned int i;
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if(!file) return NULL;
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for(i = 0;i < file->FmtCtx->nb_streams;i++)
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{
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if(file->FmtCtx->streams[i]->codec->codec_type != AVMEDIA_TYPE_AUDIO)
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continue;
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if(streamnum == 0)
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{
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StreamPtr stream;
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AVCodec *codec;
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void *temp;
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size_t j;
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||||
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/* Found the requested stream. Check if a handle to this stream
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* already exists and return it if it does */
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for(j = 0;j < file->StreamsSize;j++)
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||||
{
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||||
if(file->Streams[j]->StreamIdx == (int)i)
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||||
return file->Streams[j];
|
||||
}
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||||
|
||||
/* Doesn't yet exist. Now allocate a new stream object and fill in
|
||||
* its info */
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||||
stream = (StreamPtr)calloc(1, sizeof(*stream));
|
||||
if(!stream) return NULL;
|
||||
|
||||
stream->parent = file;
|
||||
stream->CodecCtx = file->FmtCtx->streams[i]->codec;
|
||||
stream->StreamIdx = i;
|
||||
|
||||
/* Try to find the codec for the given codec ID, and open it */
|
||||
codec = avcodec_find_decoder(stream->CodecCtx->codec_id);
|
||||
if(!codec || avcodec_open2(stream->CodecCtx, codec, NULL) < 0)
|
||||
{
|
||||
free(stream);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* Allocate space for the decoded data to be stored in before it
|
||||
* gets passed to the app */
|
||||
stream->Frame = avcodec_alloc_frame();
|
||||
if(!stream->Frame)
|
||||
{
|
||||
avcodec_close(stream->CodecCtx);
|
||||
free(stream);
|
||||
return NULL;
|
||||
}
|
||||
stream->FrameData = NULL;
|
||||
stream->FrameDataSize = 0;
|
||||
|
||||
/* Append the new stream object to the stream list. The original
|
||||
* pointer will remain valid if realloc fails, so we need to use
|
||||
* another pointer to watch for errors and not leak memory */
|
||||
temp = realloc(file->Streams, (file->StreamsSize+1) *
|
||||
sizeof(*file->Streams));
|
||||
if(!temp)
|
||||
{
|
||||
avcodec_close(stream->CodecCtx);
|
||||
av_free(stream->Frame);
|
||||
free(stream);
|
||||
return NULL;
|
||||
}
|
||||
file->Streams = (StreamPtr*)temp;
|
||||
file->Streams[file->StreamsSize++] = stream;
|
||||
return stream;
|
||||
}
|
||||
streamnum--;
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
int getAVAudioInfo(StreamPtr stream, ALuint *rate, ALenum *channels, ALenum *type)
|
||||
{
|
||||
if(!stream || stream->CodecCtx->codec_type != AVMEDIA_TYPE_AUDIO)
|
||||
return 1;
|
||||
|
||||
/* Get the sample type for OpenAL given the format detected by ffmpeg. */
|
||||
if(stream->CodecCtx->sample_fmt == AV_SAMPLE_FMT_U8)
|
||||
*type = AL_UNSIGNED_BYTE_SOFT;
|
||||
else if(stream->CodecCtx->sample_fmt == AV_SAMPLE_FMT_S16)
|
||||
*type = AL_SHORT_SOFT;
|
||||
else if(stream->CodecCtx->sample_fmt == AV_SAMPLE_FMT_S32)
|
||||
*type = AL_INT_SOFT;
|
||||
else if(stream->CodecCtx->sample_fmt == AV_SAMPLE_FMT_FLT)
|
||||
*type = AL_FLOAT_SOFT;
|
||||
else if(stream->CodecCtx->sample_fmt == AV_SAMPLE_FMT_DBL)
|
||||
*type = AL_DOUBLE_SOFT;
|
||||
else
|
||||
{
|
||||
fprintf(stderr, "Unsupported ffmpeg sample format: %s\n",
|
||||
av_get_sample_fmt_name(stream->CodecCtx->sample_fmt));
|
||||
return 1;
|
||||
}
|
||||
|
||||
/* Get the OpenAL channel configuration using the channel layout detected
|
||||
* by ffmpeg. NOTE: some file types may not specify a channel layout. In
|
||||
* that case, one must be guessed based on the channel count. */
|
||||
if(stream->CodecCtx->channel_layout == AV_CH_LAYOUT_MONO)
|
||||
*channels = AL_MONO_SOFT;
|
||||
else if(stream->CodecCtx->channel_layout == AV_CH_LAYOUT_STEREO)
|
||||
*channels = AL_STEREO_SOFT;
|
||||
else if(stream->CodecCtx->channel_layout == AV_CH_LAYOUT_QUAD)
|
||||
*channels = AL_QUAD_SOFT;
|
||||
else if(stream->CodecCtx->channel_layout == AV_CH_LAYOUT_5POINT1_BACK)
|
||||
*channels = AL_5POINT1_SOFT;
|
||||
else if(stream->CodecCtx->channel_layout == AV_CH_LAYOUT_7POINT1)
|
||||
*channels = AL_7POINT1_SOFT;
|
||||
else if(stream->CodecCtx->channel_layout == 0)
|
||||
{
|
||||
/* Unknown channel layout. Try to guess. */
|
||||
if(stream->CodecCtx->channels == 1)
|
||||
*channels = AL_MONO_SOFT;
|
||||
else if(stream->CodecCtx->channels == 2)
|
||||
*channels = AL_STEREO_SOFT;
|
||||
else
|
||||
{
|
||||
fprintf(stderr, "Unsupported ffmpeg raw channel count: %d\n",
|
||||
stream->CodecCtx->channels);
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
char str[1024];
|
||||
av_get_channel_layout_string(str, sizeof(str), stream->CodecCtx->channels,
|
||||
stream->CodecCtx->channel_layout);
|
||||
fprintf(stderr, "Unsupported ffmpeg channel layout: %s\n", str);
|
||||
return 1;
|
||||
}
|
||||
|
||||
*rate = stream->CodecCtx->sample_rate;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/* Used by getAV*Data to search for more compressed data, and buffer it in the
|
||||
* correct stream. It won't buffer data for streams that the app doesn't have a
|
||||
* handle for. */
|
||||
static int getNextPacket(FilePtr file, int streamidx)
|
||||
{
|
||||
struct PacketList *packet;
|
||||
|
||||
packet = (struct PacketList*)av_malloc(sizeof(*packet));
|
||||
packet->next = NULL;
|
||||
|
||||
next_packet:
|
||||
while(av_read_frame(file->FmtCtx, &packet->pkt) >= 0)
|
||||
{
|
||||
StreamPtr *iter = file->Streams;
|
||||
StreamPtr *iter_end = iter + file->StreamsSize;
|
||||
|
||||
/* Check each stream the user has a handle for, looking for the one
|
||||
* this packet belongs to */
|
||||
while(iter != iter_end)
|
||||
{
|
||||
if((*iter)->StreamIdx == packet->pkt.stream_index)
|
||||
{
|
||||
struct PacketList **last;
|
||||
|
||||
last = &(*iter)->Packets;
|
||||
while(*last != NULL)
|
||||
last = &(*last)->next;
|
||||
|
||||
*last = packet;
|
||||
if((*iter)->StreamIdx == streamidx)
|
||||
return 1;
|
||||
|
||||
packet = (struct PacketList*)av_malloc(sizeof(*packet));
|
||||
packet->next = NULL;
|
||||
goto next_packet;
|
||||
}
|
||||
iter++;
|
||||
}
|
||||
/* Free the packet and look for another */
|
||||
av_free_packet(&packet->pkt);
|
||||
}
|
||||
|
||||
av_free(packet);
|
||||
return 0;
|
||||
}
|
||||
|
||||
uint8_t *getAVAudioData(StreamPtr stream, size_t *length)
|
||||
{
|
||||
int got_frame;
|
||||
int len;
|
||||
|
||||
if(length) *length = 0;
|
||||
|
||||
if(!stream || stream->CodecCtx->codec_type != AVMEDIA_TYPE_AUDIO)
|
||||
return NULL;
|
||||
|
||||
next_packet:
|
||||
if(!stream->Packets && !getNextPacket(stream->parent, stream->StreamIdx))
|
||||
return NULL;
|
||||
|
||||
/* Decode some data, and check for errors */
|
||||
avcodec_get_frame_defaults(stream->Frame);
|
||||
while((len=avcodec_decode_audio4(stream->CodecCtx, stream->Frame,
|
||||
&got_frame, &stream->Packets->pkt)) < 0)
|
||||
{
|
||||
struct PacketList *self;
|
||||
|
||||
/* Error? Drop it and try the next, I guess... */
|
||||
self = stream->Packets;
|
||||
stream->Packets = self->next;
|
||||
|
||||
av_free_packet(&self->pkt);
|
||||
av_free(self);
|
||||
|
||||
if(!stream->Packets)
|
||||
goto next_packet;
|
||||
}
|
||||
|
||||
if(len < stream->Packets->pkt.size)
|
||||
{
|
||||
/* Move the unread data to the front and clear the end bits */
|
||||
int remaining = stream->Packets->pkt.size - len;
|
||||
memmove(stream->Packets->pkt.data, &stream->Packets->pkt.data[len],
|
||||
remaining);
|
||||
memset(&stream->Packets->pkt.data[remaining], 0,
|
||||
stream->Packets->pkt.size - remaining);
|
||||
stream->Packets->pkt.size -= len;
|
||||
}
|
||||
else
|
||||
{
|
||||
struct PacketList *self;
|
||||
|
||||
self = stream->Packets;
|
||||
stream->Packets = self->next;
|
||||
|
||||
av_free_packet(&self->pkt);
|
||||
av_free(self);
|
||||
}
|
||||
|
||||
if(!got_frame || stream->Frame->nb_samples == 0)
|
||||
goto next_packet;
|
||||
|
||||
/* Set the output buffer size */
|
||||
*length = av_samples_get_buffer_size(NULL, stream->CodecCtx->channels,
|
||||
stream->Frame->nb_samples,
|
||||
stream->CodecCtx->sample_fmt, 1);
|
||||
|
||||
return stream->Frame->data[0];
|
||||
}
|
||||
|
||||
size_t readAVAudioData(StreamPtr stream, void *data, size_t length)
|
||||
{
|
||||
size_t dec = 0;
|
||||
|
||||
if(!stream || stream->CodecCtx->codec_type != AVMEDIA_TYPE_AUDIO)
|
||||
return 0;
|
||||
|
||||
while(dec < length)
|
||||
{
|
||||
/* If there's no decoded data, find some */
|
||||
if(stream->FrameDataSize == 0)
|
||||
{
|
||||
stream->FrameData = getAVAudioData(stream, &stream->FrameDataSize);
|
||||
if(!stream->FrameData)
|
||||
break;
|
||||
}
|
||||
|
||||
if(stream->FrameDataSize > 0)
|
||||
{
|
||||
/* Get the amount of bytes remaining to be written, and clamp to
|
||||
* the amount of decoded data we have */
|
||||
size_t rem = length-dec;
|
||||
if(rem > stream->FrameDataSize)
|
||||
rem = stream->FrameDataSize;
|
||||
|
||||
/* Copy the data to the app's buffer and increment */
|
||||
if(data != NULL)
|
||||
{
|
||||
memcpy(data, stream->FrameData, rem);
|
||||
data = (char*)data + rem;
|
||||
}
|
||||
dec += rem;
|
||||
|
||||
/* If there's any decoded data left, move it to the front of the
|
||||
* buffer for next time */
|
||||
stream->FrameData += rem;
|
||||
stream->FrameDataSize -= rem;
|
||||
}
|
||||
}
|
||||
|
||||
/* Return the number of bytes we were able to get */
|
||||
return dec;
|
||||
}
|
||||
|
||||
void *decodeAVAudioStream(StreamPtr stream, size_t *length)
|
||||
{
|
||||
char *outbuf = NULL;
|
||||
size_t buflen = 0;
|
||||
void *inbuf;
|
||||
size_t got;
|
||||
|
||||
*length = 0;
|
||||
if(!stream || stream->CodecCtx->codec_type != AVMEDIA_TYPE_AUDIO)
|
||||
return NULL;
|
||||
|
||||
while((inbuf=getAVAudioData(stream, &got)) != NULL && got > 0)
|
||||
{
|
||||
void *ptr;
|
||||
|
||||
ptr = realloc(outbuf, NextPowerOf2(buflen+got));
|
||||
if(ptr == NULL)
|
||||
break;
|
||||
outbuf = (char*)ptr;
|
||||
|
||||
memcpy(&outbuf[buflen], inbuf, got);
|
||||
buflen += got;
|
||||
}
|
||||
outbuf = (char*)realloc(outbuf, buflen);
|
||||
|
||||
*length = buflen;
|
||||
return outbuf;
|
||||
}
|
||||
Reference in New Issue
Block a user