File content as of revision 1:3e638b9e91cd:

#include "MovFile.hpp"
#ifdef __MBED__
#include <cmsis.h>
#else
#include <arpa/inet.h>
#endif

uint32_t MovFile::frameSizes[];
uint32_t MovFile::audioSizes[];
MovFile MovFile::singleton;

#define FourConstant(a, b, c, d) ((a) << 24 | (b) << 16 | (c) << 8 | (d))

#ifndef htonl
#   define htonl(x) __REV(x)
#endif
#ifndef ntohl
#   define ntohl(x) __REV(x)
#endif

MovFile::MovFile() : frameSizesP(frameSizes), audioSizesP(audioSizes), stszAddress(0), stcoAddress(0), lastFrameAddress(0), availableCount(bufSize)
{
}

void MovFile::search(uint32_t pattern)
{
    Buffer buf;
    uint8_t first = pattern & 0xFF;
    buf.value = 0;
    while (1) {
        size_t size = fread(buf.array, sizeof(int8_t), 1, file);
        if (size == 0) {
            return;
        }
        if (buf.array[0] == first) {
            fread(&buf.array[1], sizeof(int8_t), 3, file);
            if (buf.value == pattern) {
                break;
            }
        }
    }
}

void MovFile::fillCaches()
{
    Buffer buf[bufSize];
    Buffer *bufP = buf;
    uint32_t lastFrame = lastFrameAddress;
    
    fseek(file, stszAddress, SEEK_SET);
    fread(frameSizes, sizeof(uint32_t), bufSize, file);
    stszAddress += sizeof(uint32_t) * bufSize;
    
    fseek(file, stcoAddress, SEEK_SET);
    stcoAddress += sizeof(uint32_t) * bufSize;
    fread(buf, sizeof(Buffer), bufSize, file);
    availableCount = bufSize;
    frameSizesP = frameSizes;
    audioSizesP = audioSizes;
    do {
        uint32_t frameAddress = htonl(bufP->value);
        *frameSizesP = htonl(*frameSizesP);
        *audioSizesP++ = frameAddress - lastFrameAddress - *frameSizesP;
        lastFrameAddress = frameAddress;
        ++frameSizesP;
        ++bufP;
    } while (--availableCount);
    
    fseek(file, lastFrame, SEEK_SET);
    availableCount = bufSize;
    frameSizesP = frameSizes;
    audioSizesP = audioSizes;
}

void MovFile::start(FILE *f)
{
    Buffer buf;
    file = f;
    frameSizesP = frameSizes;
    audioSizesP = audioSizes;
    
    search(htonl(FourConstant('s', 't', 's', 'z')));
    printf("stsz is at 0x%lX\n", ftell(file) - 4);
    fseek(file, 8, SEEK_CUR);
    fread(&buf, sizeof(Buffer), 1, file);
    numOfFrames = htonl(buf.value);
    printf("Number of frames: %lu\n", numOfFrames);
    stszAddress = ftell(file);
    fread(&buf, sizeof(Buffer), 1, file);
    
    search(htonl(FourConstant('s', 't', 'c', 'o')));
    printf("stco is at 0x%lX\n", ftell(file) - 4);
    fseek(file, 4, SEEK_CUR);
    fread(&buf, sizeof(Buffer), 1, file);
    if (numOfFrames != htonl(buf.value)) {
        printf("Different number of frames\n");
        return;
    }
    fread(&buf, sizeof(Buffer), 1, file);
    stcoAddress = ftell(file);
    lastFrameAddress = htonl(buf.value);
    printf("First frame is at 0x%lX\n", lastFrameAddress);
    
    fillCaches();
}

bool MovFile::read(char *videoBuf, char *audioBuf, uint32_t *audioSize)
{
    if (numOfFrames) {
        uint32_t aSize = *audioSizesP++;
        fread(videoBuf, *frameSizesP++, 1, file);
        *audioSize = (uint32_t)fread(audioBuf, 1, aSize, file);
        if (--availableCount == 0) {
            fillCaches();
        }
        return numOfFrames--;
    }
    return false;
}