Move alhelpers and alffmpeg code to a common sub-directory

1 files changed, 0 insertions, 638 deletions

diff --git a/examples/alffmpeg.c b/examples/alffmpeg.c
deleted file mode 100644
index 16f73866..00000000
--- a/examples/alffmpeg.c
+++ /dev/null
@@ -1,638 +0,0 @@
-/*
- * FFmpeg Decoder Helpers
- *
- * Copyright (c) 2011 by Chris Robinson <[email protected]>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
-/* This file contains routines for helping to decode audio using libavformat
- * and libavcodec (ffmpeg). There's very little OpenAL-specific code here. */
-
-#include <string.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <signal.h>
-#include <assert.h>
-
-#include "AL/al.h"
-#include "AL/alc.h"
-#include "AL/alext.h"
-
-#include "alhelpers.h"
-#include "alffmpeg.h"
-
-
-static size_t NextPowerOf2(size_t value)
-{
-    size_t powerOf2 = 1;
-
-    if(value)
-    {
-        value--;
-        while(value)
-        {
-            value >>= 1;
-            powerOf2 <<= 1;
-        }
-    }
-    return powerOf2;
-}
-
-
-struct MemData {
-    char *buffer;
-    size_t length;
-    size_t pos;
-};
-
-static int MemData_read(void *opaque, uint8_t *buf, int buf_size)
-{
-    struct MemData *membuf = (struct MemData*)opaque;
-    int rem = membuf->length - membuf->pos;
-
-    if(rem > buf_size)
-        rem = buf_size;
-
-    memcpy(buf, &membuf->buffer[membuf->pos], rem);
-    membuf->pos += rem;
-
-    return rem;
-}
-
-static int MemData_write(void *opaque, uint8_t *buf, int buf_size)
-{
-    struct MemData *membuf = (struct MemData*)opaque;
-    int rem = membuf->length - membuf->pos;
-
-    if(rem > buf_size)
-        rem = buf_size;
-
-    memcpy(&membuf->buffer[membuf->pos], buf, rem);
-    membuf->pos += rem;
-
-    return rem;
-}
-
-static int64_t MemData_seek(void *opaque, int64_t offset, int whence)
-{
-    struct MemData *membuf = (struct MemData*)opaque;
-
-    whence &= ~AVSEEK_FORCE;
-    switch(whence)
-    {
-        case SEEK_SET:
-            if(offset < 0 || (uint64_t)offset > membuf->length)
-                return -1;
-            membuf->pos = offset;
-            break;
-
-        case SEEK_CUR:
-            if((offset >= 0 && (uint64_t)offset > membuf->length-membuf->pos) ||
-               (offset < 0 && (uint64_t)(-offset) > membuf->pos))
-                return -1;
-            membuf->pos += offset;
-            break;
-
-        case SEEK_END:
-            if(offset > 0 || (uint64_t)(-offset) > membuf->length)
-                return -1;
-            membuf->pos = membuf->length + offset;
-            break;
-
-        case AVSEEK_SIZE:
-            return membuf->length;
-
-        default:
-            return -1;
-    }
-
-    return membuf->pos;
-}
-
-
-struct PacketList {
-    AVPacket pkt;
-    struct PacketList *next;
-};
-
-struct MyStream {
-    AVCodecContext *CodecCtx;
-    int StreamIdx;
-
-    struct PacketList *Packets;
-
-    AVFrame *Frame;
-
-    const uint8_t *FrameData;
-    size_t FrameDataSize;
-
-    FilePtr parent;
-};
-
-struct MyFile {
-    AVFormatContext *FmtCtx;
-
-    StreamPtr *Streams;
-    size_t StreamsSize;
-
-    struct MemData membuf;
-};
-
-
-static int done_init = 0;
-
-FilePtr openAVFile(const char *fname)
-{
-    FilePtr file;
-
-    /* We need to make sure ffmpeg is initialized. Optionally silence warning
-     * output from the lib */
-    if(!done_init) {av_register_all();
-    av_log_set_level(AV_LOG_ERROR);
-    done_init = 1;}
-
-    file = (FilePtr)calloc(1, sizeof(*file));
-    if(file && avformat_open_input(&file->FmtCtx, fname, NULL, NULL) == 0)
-    {
-        /* After opening, we must search for the stream information because not
-         * all formats will have it in stream headers */
-        if(avformat_find_stream_info(file->FmtCtx, NULL) >= 0)
-            return file;
-        avformat_close_input(&file->FmtCtx);
-    }
-
-    free(file);
-    return NULL;
-}
-
-FilePtr openAVData(const char *name, char *buffer, size_t buffer_len)
-{
-    FilePtr file;
-
-    if(!done_init) {av_register_all();
-    av_log_set_level(AV_LOG_ERROR);
-    done_init = 1;}
-
-    if(!name)
-        name = "";
-
-    file = (FilePtr)calloc(1, sizeof(*file));
-    if(file && (file->FmtCtx=avformat_alloc_context()) != NULL)
-    {
-        file->membuf.buffer = buffer;
-        file->membuf.length = buffer_len;
-        file->membuf.pos = 0;
-
-        file->FmtCtx->pb = avio_alloc_context(NULL, 0, 0, &file->membuf,
-                                              MemData_read, MemData_write,
-                                              MemData_seek);
-        if(file->FmtCtx->pb && avformat_open_input(&file->FmtCtx, name, NULL, NULL) == 0)
-        {
-            if(avformat_find_stream_info(file->FmtCtx, NULL) >= 0)
-                return file;
-            avformat_close_input(&file->FmtCtx);
-        }
-        if(file->FmtCtx)
-            avformat_free_context(file->FmtCtx);
-        file->FmtCtx = NULL;
-    }
-
-    free(file);
-    return NULL;
-}
-
-FilePtr openAVCustom(const char *name, void *user_data,
-                     int (*read_packet)(void *user_data, uint8_t *buf, int buf_size),
-                     int (*write_packet)(void *user_data, uint8_t *buf, int buf_size),
-                     int64_t (*seek)(void *user_data, int64_t offset, int whence))
-{
-    FilePtr file;
-
-    if(!done_init) {av_register_all();
-    av_log_set_level(AV_LOG_ERROR);
-    done_init = 1;}
-
-    if(!name)
-        name = "";
-
-    file = (FilePtr)calloc(1, sizeof(*file));
-    if(file && (file->FmtCtx=avformat_alloc_context()) != NULL)
-    {
-        file->FmtCtx->pb = avio_alloc_context(NULL, 0, 0, user_data,
-                                              read_packet, write_packet, seek);
-        if(file->FmtCtx->pb && avformat_open_input(&file->FmtCtx, name, NULL, NULL) == 0)
-        {
-            if(avformat_find_stream_info(file->FmtCtx, NULL) >= 0)
-                return file;
-            avformat_close_input(&file->FmtCtx);
-        }
-        if(file->FmtCtx)
-            avformat_free_context(file->FmtCtx);
-        file->FmtCtx = NULL;
-    }
-
-    free(file); 
-    return NULL;
-}
-
-
-void clearAVAudioData(StreamPtr stream)
-{
-    while(stream->Packets)
-    {
-        struct PacketList *self;
-
-        self = stream->Packets;
-        stream->Packets = self->next;
-
-        av_free_packet(&self->pkt);
-        av_free(self);
-    }
-}
-
-
-void closeAVFile(FilePtr file)
-{
-    size_t i;
-
-    if(!file) return;
-
-    for(i = 0;i < file->StreamsSize;i++)
-    {
-        StreamPtr stream = file->Streams[i];
-
-        while(stream->Packets)
-        {
-            struct PacketList *self;
-
-            self = stream->Packets;
-            stream->Packets = self->next;
-
-            av_free_packet(&self->pkt);
-            av_free(self);
-        }
-
-        avcodec_close(stream->CodecCtx);
-        av_free(stream->Frame);
-        free(stream);
-    }
-    free(file->Streams);
-
-    avformat_close_input(&file->FmtCtx);
-    free(file);
-}
-
-
-int getAVFileInfo(FilePtr file, int *numaudiostreams)
-{
-    unsigned int i;
-    int audiocount = 0;
-
-    if(!file) return 1;
-    for(i = 0;i < file->FmtCtx->nb_streams;i++)
-    {
-        if(file->FmtCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
-            audiocount++;
-    }
-    *numaudiostreams = audiocount;
-    return 0;
-}
-
-StreamPtr getAVAudioStream(FilePtr file, int streamnum)
-{
-    unsigned int i;
-    if(!file) return NULL;
-    for(i = 0;i < file->FmtCtx->nb_streams;i++)
-    {
-        if(file->FmtCtx->streams[i]->codec->codec_type != AVMEDIA_TYPE_AUDIO)
-            continue;
-
-        if(streamnum == 0)
-        {
-            StreamPtr stream;
-            AVCodec *codec;
-            void *temp;
-            size_t j;
-
-            /* Found the requested stream. Check if a handle to this stream
-             * already exists and return it if it does */
-            for(j = 0;j < file->StreamsSize;j++)
-            {
-                if(file->Streams[j]->StreamIdx == (int)i)
-                    return file->Streams[j];
-            }
-
-            /* Doesn't yet exist. Now allocate a new stream object and fill in
-             * its info */
-            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;
-}