C++ (Cpp) bytestream2_put_be24 Examples

Example #1

File: h264_parse.c Project: 411697643/FFmpeg

/* There are (invalid) samples in the wild with mp4-style extradata, where the
 * parameter sets are stored unescaped (i.e. as RBSP).
 * This function catches the parameter set decoding failure and tries again
 * after escaping it */
static int decode_extradata_ps_mp4(const uint8_t *buf, int buf_size, H264ParamSets *ps,
                                   int err_recognition, void *logctx)
{
    int ret;

    ret = decode_extradata_ps(buf, buf_size, ps, 1, logctx);
    if (ret < 0 && !(err_recognition & AV_EF_EXPLODE)) {
        GetByteContext gbc;
        PutByteContext pbc;
        uint8_t *escaped_buf;
        int escaped_buf_size;

        av_log(logctx, AV_LOG_WARNING,
               "SPS decoding failure, trying again after escaping the NAL\n");

        if (buf_size / 2 >= (INT16_MAX - AV_INPUT_BUFFER_PADDING_SIZE) / 3)
            return AVERROR(ERANGE);
        escaped_buf_size = buf_size * 3 / 2 + AV_INPUT_BUFFER_PADDING_SIZE;
        escaped_buf = av_mallocz(escaped_buf_size);
        if (!escaped_buf)
            return AVERROR(ENOMEM);

        bytestream2_init(&gbc, buf, buf_size);
        bytestream2_init_writer(&pbc, escaped_buf, escaped_buf_size);

        while (bytestream2_get_bytes_left(&gbc)) {
            if (bytestream2_get_bytes_left(&gbc) >= 3 &&
                bytestream2_peek_be24(&gbc) <= 3) {
                bytestream2_put_be24(&pbc, 3);
                bytestream2_skip(&gbc, 2);
            } else
                bytestream2_put_byte(&pbc, bytestream2_get_byte(&gbc));
        }

        escaped_buf_size = bytestream2_tell_p(&pbc);
        AV_WB16(escaped_buf, escaped_buf_size - 2);

        ret = decode_extradata_ps(escaped_buf, escaped_buf_size, ps, 1, logctx);
        av_freep(&escaped_buf);
        if (ret < 0)
            return ret;
    }

    return 0;
}

Example #2

File: audiotoolboxdec.c Project: 0xheart0/FFmpeg

static uint8_t* ffat_get_magic_cookie(AVCodecContext *avctx, UInt32 *cookie_size)
{
    ATDecodeContext *at = avctx->priv_data;
    if (avctx->codec_id == AV_CODEC_ID_AAC) {
        char *extradata;
        PutByteContext pb;
        *cookie_size = 5 + 3 + 5+13 + 5+at->extradata_size;
        if (!(extradata = av_malloc(*cookie_size)))
            return NULL;

        bytestream2_init_writer(&pb, extradata, *cookie_size);

        // ES descriptor
        put_descr(&pb, 0x03, 3 + 5+13 + 5+at->extradata_size);
        bytestream2_put_be16(&pb, 0);
        bytestream2_put_byte(&pb, 0x00); // flags (= no flags)

        // DecoderConfig descriptor
        put_descr(&pb, 0x04, 13 + 5+at->extradata_size);

        // Object type indication
        bytestream2_put_byte(&pb, 0x40);

        bytestream2_put_byte(&pb, 0x15); // flags (= Audiostream)

        bytestream2_put_be24(&pb, 0); // Buffersize DB

        bytestream2_put_be32(&pb, 0); // maxbitrate
        bytestream2_put_be32(&pb, 0); // avgbitrate

        // DecoderSpecific info descriptor
        put_descr(&pb, 0x05, at->extradata_size);
        bytestream2_put_buffer(&pb, at->extradata, at->extradata_size);
        return extradata;
    } else {
        *cookie_size = at->extradata_size;
        return at->extradata;
    }
}