Function main

examples/avif_example_decode_streaming.c:123–232

}

int main(int argc, char * argv[])
{
    if (argc != 2) {
        fprintf(stderr, "avif_example_decode_streaming [filename.avif]\n");
        return 1;
    }
    const char * inputFilename = argv[1];

    int returnCode = 1;
    avifDecoder * decoder = NULL;

    // Read entire file into fileBuffer
    FILE * f = NULL;
    uint8_t * fileBuffer = NULL;
    f = fopen(inputFilename, "rb");
    if (!f) {
        fprintf(stderr, "Cannot open file for read: %s\n", inputFilename);
        goto cleanup;
    }
    fseek(f, 0, SEEK_END);
    long fileSize = ftell(f);
    if (fileSize < 0) {
        fprintf(stderr, "Truncated file: %s\n", inputFilename);
        goto cleanup;
    }
    fseek(f, 0, SEEK_SET);
    fileBuffer = malloc(fileSize);
    long bytesRead = (long)fread(fileBuffer, 1, fileSize, f);
    if (bytesRead != fileSize) {
        fprintf(stderr, "Cannot read file: %s\n", inputFilename);
        goto cleanup;
    }

    decoder = avifDecoderCreate();
    if (!decoder) {
        fprintf(stderr, "Memory allocation failure\n");
        goto cleanup;
    }
    // Override decoder defaults here (codecChoice, requestedSource, ignoreExif, ignoreXMP, etc)

    avifIOStreamingReader * io = avifIOCreateStreamingReader(fileBuffer, fileSize);
    if (!io) {
        fprintf(stderr, "Memory allocation failure\n");
        goto cleanup;
    }
    avifDecoderSetIO(decoder, (avifIO *)io);

    for (int pass = 0; pass < 2; ++pass) {
        // This shows the difference in how much data avifDecoderParse() needs from the file
        // depending on whether or not Exif/XMP metadata is necessary. If the caller plans to
        // interpret this metadata, avifDecoderParse() will continue to return
        // AVIF_RESULT_WAITING_ON_IO until it has those payloads in their entirety (if they exist).
        decoder->ignoreExif = decoder->ignoreXMP = (pass > 0);

        // Slowly pretend to have streamed-in / downloaded more and more bytes by incrementing io->downloadedBytes
        avifResult parseResult = AVIF_RESULT_UNKNOWN_ERROR;
        for (io->downloadedBytes = 0; io->downloadedBytes <= io->io.sizeHint; ++io->downloadedBytes) {
            parseResult = avifDecoderParse(decoder);